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ITER (initially the International Thermonuclear Experimental Reactor, ''iter'' meaning "the way" or "the path" in Latin) is an international
nuclear fusion Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles ( neutrons or protons). The difference in mass between the reactants and products is manifest ...
research and engineering
megaproject A megaproject is an extremely large-scale investment project. According to the ''Oxford Handbook of Megaproject Management'', "Megaprojects are large-scale, complex ventures that typically cost $1 billion or more, take many years to develop and ...
aimed at creating energy by replicating, on Earth, the fusion processes of the Sun. Upon completion of construction of the main reactor and first plasma, planned for late 2025, it will be the world's largest
magnetic confinement Magnetic confinement fusion is an approach to generate thermonuclear fusion power that uses magnetic fields to confine fusion fuel in the form of a plasma. Magnetic confinement is one of two major branches of fusion energy research, along with ...
plasma physics Plasma ()πλάσμα
, Henry George Liddell, R ...
experiment and the largest experimental
tokamak A tokamak (; russian: токамáк; otk, 𐱃𐰸𐰢𐰴, Toḳamaḳ) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being d ...
nuclear fusion reactor. It is being built next to the
Cadarache Cadarache is the largest technological research and development centre for energy in Europe. It includes the CEA research activities and ITER. CEA Cadarache is one of the 10 research centres of the French Commission of Atomic and Alternative En ...
facility in southern France. ITER will be the largest of more than 100 fusion reactors built since the 1950s, with ten times the plasma volume of any other
tokamak A tokamak (; russian: токамáк; otk, 𐱃𐰸𐰢𐰴, Toḳamaḳ) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being d ...
operating today. The long-term goal of fusion research is to generate electricity. ITER's stated purpose is scientific research, and technological demonstration of a large fusion reactor, without electricity generation. ITER's goals are to achieve enough fusion to produce 10 times as much thermal output power as thermal power absorbed by the plasma for short time periods; to demonstrate and test technologies that would be needed to operate a fusion power plant including cryogenics, heating, control and diagnostics systems, and remote maintenance; to achieve and learn from a ''burning'' plasma; to test
tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...
breeding Breeding is sexual reproduction that produces offspring, usually animals or plants. It can only occur between a male and a female animal or plant. Breeding may refer to: * Animal husbandry, through selected specimens such as dogs, horses, and ra ...
; and to demonstrate the safety of a fusion plant. ITER's
thermonuclear fusion Thermonuclear fusion is the process of atomic nuclei combining or “fusing” using high temperatures to drive them close enough together for this to become possible. There are two forms of thermonuclear fusion: ''uncontrolled'', in which the re ...
reactor will use over 300 MW of electrical power to cause the plasma to absorb 50  MW of thermal power, creating 500 MW of heat from fusion for periods of 400 to 600 seconds. This would mean a ten-fold gain of plasma heating power (Q), as measured by heating input to thermal output, or Q ≥ 10. , the record for energy production using nuclear fusion is held by the
National Ignition Facility The National Ignition Facility (NIF) is a laser-based inertial confinement fusion (ICF) research device, located at Lawrence Livermore National Laboratory in Livermore, California, United States. NIF's mission is to achieve fusion ignition wit ...
reactor, which achieved a Q of 1.5 in December 2022. Beyond just heating the plasma, the total electricity consumed by the reactor and facilities will range from 110 MW up to 620 MW peak for 30-second periods during plasma operation. As a research reactor, the heat energy generated will not be converted to electricity, but simply vented. ITER is funded and run by seven member parties:
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
, the
European Union The European Union (EU) is a supranational political and economic union of member states that are located primarily in Europe. The union has a total area of and an estimated total population of about 447million. The EU has often been des ...
,
India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
,
Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
,
South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korea, Korean Peninsula and sharing a Korean Demilitarized Zone, land border with North Korea. Its western border is formed ...
and the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
. The
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...
participates through EU's
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
(F4E),
Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...
participates through
Euratom The European Atomic Energy Community (EAEC or Euratom) is an international organisation established by the Euratom Treaty on 25 March 1957 with the original purpose of creating a specialist market for nuclear power in Europe, by developing nucl ...
and F4E, and the project has cooperation agreements with Australia, Canada, Kazakhstan and Thailand. Construction of the ITER complex in France started in 2013, and assembly of the tokamak began in 2020. The initial budget was close to €6 billion, but the total price of construction and operations is projected to be from €18 to €22 billion; other estimates place the total cost between $45 billion and $65 billion, though these figures are disputed by ITER. Regardless of the final cost, ITER has already been described as the most expensive science experiment of all time, the most complicated engineering project in human history, and one of the most ambitious human collaborations since the development of the
International Space Station The International Space Station (ISS) is the largest modular space station currently in low Earth orbit. It is a multinational collaborative project involving five participating space agencies: NASA (United States), Roscosmos (Russia), JAXA ...
(€100 billion or $150 billion budget) and the
Large Hadron Collider The Large Hadron Collider (LHC) is the world's largest and highest-energy particle collider. It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and hundred ...
(€7.5 billion budget). ITER's planned successor, the
EUROfusion EUROfusion is a consortium of national fusion research institutes located in the European Union, the UK, Switzerland and Ukraine. It was established in 2014 to succeed the European Fusion Development Agreement ( EFDA) as the umbrella organisation o ...
-led
DEMO Demo, usually short for demonstration, may refer to: Music and film *Demo (music), a song typically recorded for reference rather than release * ''Demo'' (Behind Crimson Eyes), a 2004 recording by the band Behind Crimson Eyes * ''Demo'' (Deafhea ...
, is expected to be one of the first fusion reactors to produce electricity in an experimental environment.


Background

Fusion aims to replicate the process that takes place in stars where the intense heat at the core fuses together nuclei and produces massive amounts of energy in the form of heat and light. Harnessing fusion power in terrestrial conditions would provide sufficient energy to satisfy mounting demand, and to do so in a sustainable manner that has a relatively small impact on the environment. One gram of deuterium-tritium fuel mixture in the process of
nuclear fusion Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles ( neutrons or protons). The difference in mass between the reactants and products is manifest ...
produces 90,000-kilowatt hours of energy, or the equivalent of 11 tonnes of coal. Nuclear fusion uses a different approach to traditional nuclear energy. Current nuclear power stations rely on nuclear fission with the nucleus of an atom being split to release energy. Nuclear fusion takes multiple nuclei and uses intense heat to fuse them together, a process that also releases energy. Nuclear fusion has many potential attractions. The fuel is relatively abundant or can be produced in a fusion reactor. After preliminary tests with deuterium, ITER will use a mix of deuterium-tritium for its fusion because of the combination's high energy potential. Also this fusion reaction is the easiest to run. The first isotope,
deuterium Deuterium (or hydrogen-2, symbol or deuterium, also known as heavy hydrogen) is one of two Stable isotope ratio, stable isotopes of hydrogen (the other being Hydrogen atom, protium, or hydrogen-1). The atomic nucleus, nucleus of a deuterium ato ...
, can be extracted from
seawater Seawater, or salt water, is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, 35 ppt, 600 mM). This means that every kilogram (roughly one liter by volume) of seawater has appro ...
, which means it is a nearly inexhaustible resource. The second isotope,
tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...
, only occurs in trace amounts in nature and the estimated world's supply (mainly produced by the heavy-water CANDU fission reactors) is just 20 kilograms per year, insufficient for power plants. ITER will be testing tritium
breeding blanket The tritium breeding blanket (also known as a fusion blanket, lithium blanket or simply blanket), is a key part of many proposed fusion reactor designs. It serves several purposes; one is to act as a cooling mechanism, absorbing the energy from the ...
technology that would allow a future fusion reactor to create its own tritium and thus be self-sufficient. Furthermore, a fusion reactor would produce virtually no CO2 emissions or atmospheric pollutants, there would be no chance of a meltdown, and its radioactive waste products would mostly be very short-lived compared to those produced by conventional nuclear reactors (fission reactors). On 21 November 2006, the seven project partners formally agreed to fund the creation of a nuclear fusion reactor. The program is anticipated to last for 30 years – 10 years for construction, and 20 years of operation. ITER was originally expected to cost approximately €5 billion. However, delays, the rising price of raw materials, and changes to the initial design have seen the official budget estimate rise to between €18 billion and €20 billion. The reactor was expected to take 10 years to build and ITER had planned to test its first plasma in 2020 and achieve full fusion by 2023, however the schedule is now to test first plasma in 2025 and full fusion in 2035. Site preparation has begun near
Cadarache Cadarache is the largest technological research and development centre for energy in Europe. It includes the CEA research activities and ITER. CEA Cadarache is one of the 10 research centres of the French Commission of Atomic and Alternative En ...
center, France, and French President
Emmanuel Macron Emmanuel Macron (; born 21 December 1977) is a French politician who has served as President of France since 2017. ''Ex officio'', he is also one of the two Co-Princes of Andorra. Prior to his presidency, Macron served as Minister of Econ ...
launched the assembly phase of the project at a ceremony in 2020. Under the revised schedule, work to achieve the first hydrogen plasma discharge was 70% complete in the mid of 2020 and considered on track. One of the ITER objectives is a Q-value ("fusion gain") of 10. Q = 1 is called a breakeven. The best result achieved in a tokamak is 0.67 in the JET tokamak. The best result achieved for fusion in general is Q = 1.5, achieved in an
inertial confinement fusion Inertial confinement fusion (ICF) is a fusion energy process that initiates nuclear fusion reactions by compressing and heating targets filled with thermonuclear fuel. In modern machines, the targets are small spherical pellets about the size of ...
(ICF) experiment by the
National Ignition Facility The National Ignition Facility (NIF) is a laser-based inertial confinement fusion (ICF) research device, located at Lawrence Livermore National Laboratory in Livermore, California, United States. NIF's mission is to achieve fusion ignition wit ...
in late 2022. For commercial fusion power stations, engineering gain factor is important. Engineering gain factor is defined as the ratio of a plant electrical power output to electrical power input of all plant's internal systems (tokamak external heating systems, electromagnets, cryogenics plant, diagnostics and control systems, etc.). Commercial fusion plants will be designed with engineering breakeven in mind (see
DEMO Demo, usually short for demonstration, may refer to: Music and film *Demo (music), a song typically recorded for reference rather than release * ''Demo'' (Behind Crimson Eyes), a 2004 recording by the band Behind Crimson Eyes * ''Demo'' (Deafhea ...
). Some nuclear engineers consider a Q of 100 is required for commercial fusion power stations to be viable. ITER will not produce electricity. Producing electricity from thermal sources is a well known process (used in many power stations) and ITER will not run with significant fusion power output continuously. Adding electricity production to ITER would raise the cost of the project and bring no value for experiments on the tokamak. The
DEMO Demo, usually short for demonstration, may refer to: Music and film *Demo (music), a song typically recorded for reference rather than release * ''Demo'' (Behind Crimson Eyes), a 2004 recording by the band Behind Crimson Eyes * ''Demo'' (Deafhea ...
-class reactors that are planned to follow ITER are intended to demonstrate the net production of electricity. One of the primary ITER objectives is to achieve a state of "
burning plasma Plasma, one of the four fundamental states of matter, consists of a gas of ions and free electrons. A burning plasma is one in which most of the plasma heating comes from fusion reactions involving thermal plasma ions. The Sun In the Sun and ...
". Burning plasma is the state of the plasma when more than 50% of the energy received for plasma heating is received from fusion reactions (not from external sources). No fusion reactors had created a burning plasma until the competing NIF fusion project reached the milestone on 8 August 2021. At higher Q values, progressively bigger parts of plasma heating power will be produced by fusion reactions. This reduces the power needed from external heating systems at high Q values. The bigger a tokamak is, the more fusion reaction-produced energy is preserved for internal plasma heating (and the less external heating is required), which also improves its Q-value. This is how ITER plans for its tokamak reactor to scale.


Organisation history

The initial international cooperation for a nuclear fusion project that was the foundation of ITER began in 1978 with the International Tokamak Reactor, or INTOR, which had four partners: the Soviet Union, the
European Atomic Energy Community The European Atomic Energy Community (EAEC or Euratom) is an international organisation established by the Euratom Treaty on 25 March 1957 with the original purpose of creating a specialist market for nuclear power in Europe, by developing nucl ...
, the United States, and Japan. However, the INTOR project stalled until
Mikhail Gorbachev Mikhail Sergeyevich Gorbachev (2 March 1931 – 30 August 2022) was a Soviet politician who served as the 8th and final leader of the Soviet Union from 1985 to dissolution of the Soviet Union, the country's dissolution in 1991. He served a ...
became general secretary of the Communist Party of the Soviet Union in March 1985. Gorbachev first revived interest in a collaborative fusion project in an October 1985 meeting with French President
François Mitterrand François Marie Adrien Maurice Mitterrand (26 October 19168 January 1996) was President of France, serving under that position from 1981 to 1995, the longest time in office in the history of France. As First Secretary of the Socialist Party, he ...
, and then the idea was further developed in November 1985 at the Geneva Summit with
Ronald Reagan Ronald Wilson Reagan ( ; February 6, 1911June 5, 2004) was an American politician, actor, and union leader who served as the 40th president of the United States from 1981 to 1989. He also served as the 33rd governor of California from 1967 ...
. Preparations for the Gorbachev-Reagan summit showed that there were no tangible agreements in the works for the summit. However, the ITER project was gaining momentum in political circles due to the quiet work being done by two physicists, the American scientist
Alvin Trivelpiece Alvin W. Trivelpiece (died 2022) was an American physicist whose varied career included positions as director of the Office of Energy Research of the U.S. Department of Energy (DOE), executive officer of the American Association for the Advancem ...
who served as Director of the Office of Energy Research in the 1980s and the Russian scientist
Evgeny Velikhov Evgeny Pavlovich Velikhov (born on February 2, 1935; in Russian: ''Евгений Павлович Велихов'') is a physicist and scientific leader in the Russia, Russian Federation. His scientific interests include Plasma (physics), plasma ...
who would become head of the
Kurchatov Institute The Kurchatov Institute (russian: Национальный исследовательский центр «Курчатовский Институт», 'National Research Centre "Kurchatov Institute) is Russia's leading research and developmen ...
for nuclear research. The two scientists both supported a project to construct a demonstration fusion reactor. At the time, magnetic fusion research was ongoing in Japan, Europe, the Soviet Union and the US, but Trivelpiece and Velikhov believed that taking the next step in fusion research would be beyond the budget of any of the key nations and that collaboration would be useful internationally. Dr. Michael Robert, who is the director of International Programs of the Office of Fusion Energy at the US Department of Energy, explains that, 'In September 1985, I led a US science team to Moscow as part of our bilateral fusion activities. Velikhov proposed to me at lunch one day his idea of having the USSR and USA work together to proceed to a fusion reactor. My response was 'great idea', but from my position, I have no capability of pushing that idea upward to the President.' This push for cooperation on nuclear fusion is cited as a key moment of
science diplomacy Science diplomacy is the use of scientific collaborations among nations to address common problems and to build constructive international partnerships. Science diplomacy is a form of new diplomacy and has become an umbrella term to describe a n ...
, but nonetheless a major bureaucratic fight erupted in the US government over the project. One argument against collaboration was that the Soviets would use it to steal US technology and expertise. A second was symbolic and involved American criticism of how the Soviet physicist
Andrei Sakharov Andrei Dmitrievich Sakharov ( rus, Андрей Дмитриевич Сахаров, p=ɐnˈdrʲej ˈdmʲitrʲɪjevʲɪtɕ ˈsaxərəf; 21 May 192114 December 1989) was a Soviet nuclear physicist, dissident, nobel laureate and activist for nu ...
was being treated. Sakharov was an early proponent of the peaceful use of nuclear technology and along with
Igor Tamm Igor Yevgenyevich Tamm ( rus, И́горь Евге́ньевич Тамм , p=ˈiɡərʲ jɪvˈɡʲenʲjɪvitɕ ˈtam , a=Ru-Igor Yevgenyevich Tamm.ogg; 8 July 1895 – 12 April 1971) was a Soviet physicist who received the 1958 Nobel Prize in ...
he developed the idea for the tokamak that is at the heart of nuclear fusion research. However, Sakharov also supported broader civil liberties in the Soviet Union, and his activism earned him both the 1975 Nobel peace prize and internal exile in Russia, which he opposed by going on multiple hunger strikes. The
United States National Security Council The United States National Security Council (NSC) is the principal forum used by the President of the United States for consideration of national security, military, and foreign policy matters. Based in the White House, it is part of the Execu ...
convened a meeting under the direction of
William Flynn Martin William Flynn Martin (born October 4, 1950) is an American energy economist, educator, and international diplomat. Martin served as Special Assistant to Ronald Reagan for National Security Affairs, Executive Secretary of the United States Nationa ...
to discuss the nuclear fusion project that resulted in a consensus that the US should go forward with the project. This led to nuclear fusion cooperation being discussed at the Geneva summit and release of a historic joint statement from Reagan and Gorbachev that emphasized, "the potential importance of the work aimed at utilizing controlled thermonuclear fusion for peaceful purposes and, in this connection, advocated the widest practicable development of international cooperation in obtaining this source of energy, which is essentially inexhaustible, for the benefit of all mankind." For the fusion community, this statement was a breakthrough, and it was reinforced when Reagan evoked the possibilities of nuclear fusion in a Joint Session of Congress later in the month. As a result, collaboration on an international fusion experiment began to move forward. In October 1986 at the Reykjavik Summit, the so-called 'Quadripartite Initiative Committee' (Europe through the Euratom countries, Japan, USSR, and the USA) was formed to oversee the development of the project. The year after, in March 1987, the Quadripartite Initiative Committee met at the
International Atomic Energy Agency The International Atomic Energy Agency (IAEA) is an intergovernmental organization that seeks to promote the peaceful use of nuclear energy and to inhibit its use for any military purpose, including nuclear weapons. It was established in 1957 ...
(IAEA) headquarters in Vienna. This meeting marked the launch of the conceptual design studies for the experimental reactors as well as the start of negotiations for operational issues such as the legal foundations for the peaceful use of fusion technology, the organizational structure and staffing, and the eventual location for the project. This meeting in Vienna was also where the project was baptized the International Thermonuclear Experimental Reactor, although it was quickly referred to by its abbreviation alone and its Latin meaning of 'the way'. Conceptual and engineering design phases were carried out under the auspices of the IAEA. The original technical objectives were established in 1992 and the original Engineering Design Activities (EDA) were completed in 1998. An acceptable, detailed design was validated in July 2001 to complete the extended EDA period, and the validated design then went through a Design Review that began November 2006 and concluded in December 2007. The design process was difficult with arguments over issues such as whether there should be circular cross sections for magnetic confinement or 'D' shaped cross sections. These issues were partly responsible for the United States temporarily exiting the project in 1998 before rejoining in 2003. At this same time, the group of ITER partners was expanding, with China and South Korea joining the project in 2003 and India formally joined in 2005. There was a heated competition to host the ITER project with the candidates narrowed down to two possible sites: France and Japan. Russia, China, and the European Union supported the choice of Cadarache in France, while the United States, South Korea, and Japan support the choice of
Rokkasho is a village in Aomori Prefecture, Japan. , the village had an estimated population of 10,200, and a population density of 40 persons per km², in 4,855 households. The total area of the village is . Geography Rokkasho occupies the eastern coa ...
in Japan. In June 2005, it was officially announced that ITER would be built in the South of France at the Cadarache site. The negotiations that led to the decision ended in a compromise between the EU and Japan, in that Japan was promised 20% of the research staff on the French location of ITER, as well as the head of the administrative body of ITER. In addition, it was agreed that 8% of the ITER construction budget would go to partner facilities that would be built in Japan. On 21 November 2006, at a ceremony hosted by French President Jacques Chirac at the Élysée Palace in Paris, an international consortium signed a formal agreement to build the reactor. Initial work to clear the site for construction began in Cadarache in March 2007 and, once this agreement was ratified by all partners, the ITER Organization was officially established on 24 October 2007. In 2016, Australia became the first non-member partner of the project. ITER signed a technical cooperation agreement with the
Australian Nuclear Science and Technology Organisation The Australian Nuclear Science and Technology Organisation (ANSTO) is a statutory body of the Australian government, formed in 1987 to replace the Australian Atomic Energy Commission. Its head office and main facilities are in southern outs ...
(ANSTO), granting this country access to research results of ITER in exchange for the construction of selected parts of the ITER machine. In 2017, Kazakhstan signed a cooperation agreement that laid the groundwork for technical collaboration between the National Nuclear Center of the Republic of Kazakhstan and ITER. Most recently, after collaborating with ITER in the early stages of the project, Canada signed a cooperation agreement in 2020 with a focus on tritium and tritium-related equipment. The project began its five-year assembly phase in July 2020, launched by the French President
Emmanuel Macron Emmanuel Macron (; born 21 December 1977) is a French politician who has served as President of France since 2017. ''Ex officio'', he is also one of the two Co-Princes of Andorra. Prior to his presidency, Macron served as Minister of Econ ...
in the presence of other members of the ITER project.


Directors-General

ITER is supervised by a governing body known as the ITER Council that is composed of representatives of the seven signatories to the ITER Agreement. The ITER Council is responsible for the overall direction of the organization and decides such issues as the budget. The ITER Council also appoints the director-general of the project. There have been three directors-general so far: * 2005–2010:
Kaname Ikeda is a Japanese civil servant. Ikeda graduated from the University of Tokyo in 1968, and joined the Atomic Energy Bureau of the Japanese Science and Technology Agency (STA). In 1984 he became Director of the Nuclear Fuels Division of the STA. In 19 ...
* 2010–2015: Osamu Motojima * 2015–2020: Bernard Bigot * 2020–2022 (his death): Bernard Bigot * 2022: Eisuke Tada (acting) * 2022–present: Pietro Barabaschi Bernard Bigot, was appointed to reform the management and governance of the ITER project. In January 2019, the ITER Council voted unanimously to reappoint Bigot for a second five-year term. Bigot passed away on May 14, 2022 and his deputy Eisuke Tada will take over leadership of ITER during the search process for the new director.


Objectives

ITER's stated mission is to demonstrate the feasibility of fusion power as a large-scale, carbon-free source of energy. More specifically, the project has aims to: * Momentarily produce a fusion plasma with thermal power ten times greater than the injected thermal power (a ''Q'' value of 10). * Produce a steady-state plasma with a ''Q'' value greater than 5. (''Q'' = 1 is scientific breakeven, as defined in
fusion energy gain factor A fusion energy gain factor, usually expressed with the symbol ''Q'', is the ratio of fusion power produced in a nuclear fusion reactor to the power required to maintain the plasma in steady state. The condition of ''Q'' = 1, when the power bei ...
.) * Maintain a fusion pulse for up to 8 minutes. * Develop technologies and processes needed for a fusion power station — including
superconducting magnet A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire has no electrical resistance and therefore can conduct mu ...
s and
remote handling Telerobotics is the area of robotics concerned with the control of semi-autonomous robots from a distance, chiefly using television, wireless networks (like Wi-Fi, Bluetooth and the Deep Space Network) or tethered connections. It is a combinatio ...
(maintenance by robot). * Verify
tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...
breeding Breeding is sexual reproduction that produces offspring, usually animals or plants. It can only occur between a male and a female animal or plant. Breeding may refer to: * Animal husbandry, through selected specimens such as dogs, horses, and ra ...
concepts. * Refine neutron shield / heat conversion technology (most of the energy in the D+T fusion reaction is released in the form of fast neutrons). * Experiment with burning plasma state The objectives of the ITER project are not limited to creating the nuclear fusion device but are much broader, including building necessary technical, organizational, and logistical capabilities, skills, tools, supply chains, and culture enabling management of such megaprojects among participating countries, bootstrapping their local nuclear fusion industries.


Timeline and status

As of May 2021 ITER is near 75% complete toward first plasma. Start is scheduled for late 2025. The start of the project can be traced back to 1978 when the
European Commission The European Commission (EC) is the executive of the European Union (EU). It operates as a cabinet government, with 27 members of the Commission (informally known as "Commissioners") headed by a President. It includes an administrative body o ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
, and
USSR The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...
joined for the International Tokamak Reactor (INTOR) Workshop. This initiative was held under the auspices of the
International Atomic Energy Agency The International Atomic Energy Agency (IAEA) is an intergovernmental organization that seeks to promote the peaceful use of nuclear energy and to inhibit its use for any military purpose, including nuclear weapons. It was established in 1957 ...
and its goals were to assess the readiness of magnetic fusion to move forward to the experimental power reactor (EPR) stage, to identify the additional R&D that must be undertaken, and to define the characteristics of such an EPR by means of a conceptual design. From 1978 to the middle of the 1980s, hundreds of fusion scientists and engineers in each participating country took part in a detailed assessment of the
tokamak A tokamak (; russian: токамáк; otk, 𐱃𐰸𐰢𐰴, Toḳamaḳ) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being d ...
confinement system and the design possibilities for harnessing nuclear fusion energy. In 1985, at the Geneva summit meeting in 1985,
Mikhail Gorbachev Mikhail Sergeyevich Gorbachev (2 March 1931 – 30 August 2022) was a Soviet politician who served as the 8th and final leader of the Soviet Union from 1985 to dissolution of the Soviet Union, the country's dissolution in 1991. He served a ...
suggested to
Ronald Reagan Ronald Wilson Reagan ( ; February 6, 1911June 5, 2004) was an American politician, actor, and union leader who served as the 40th president of the United States from 1981 to 1989. He also served as the 33rd governor of California from 1967 ...
that the two countries jointly undertake the construction of a tokamak EPR as proposed by the INTOR Workshop. The ITER project was initiated in 1988. Ground was broken in 2007http://www.iter.org/doc/www/content/com/Lists/list_items/Attachments/484/annual_report_2007.pdf and construction of the ITER tokamak complex started in 2013. Machine assembly was launched on 28 July 2020. The construction of the facility is expected to be completed in 2025 when commissioning of the reactor can commence and initial plasma experiments are scheduled to begin at the end of that year. When ITER becomes operational, it will be the largest
magnetic confinement Magnetic confinement fusion is an approach to generate thermonuclear fusion power that uses magnetic fields to confine fusion fuel in the form of a plasma. Magnetic confinement is one of two major branches of fusion energy research, along with ...
plasma physics experiment in use with a plasma volume of 840 cubic meters, surpassing the
Joint European Torus The Joint European Torus, or JET, is an operational Magnetic confinement fusion, magnetically confined Plasma (physics), plasma physics experiment, located at Culham Centre for Fusion Energy in Oxfordshire, United Kingdom, UK. Based on a tokamak ...
by a factor of 8.


Reactor overview

When
deuterium Deuterium (or hydrogen-2, symbol or deuterium, also known as heavy hydrogen) is one of two Stable isotope ratio, stable isotopes of hydrogen (the other being Hydrogen atom, protium, or hydrogen-1). The atomic nucleus, nucleus of a deuterium ato ...
and
tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...
fuse, two nuclei come together to form a
helium Helium (from el, ἥλιος, helios, lit=sun) is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. ...
nucleus (an
alpha particle Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus. They are generally produced in the process of alpha decay, but may also be produce ...
), and a high-energy
neutron The neutron is a subatomic particle, symbol or , which has a neutral (not positive or negative) charge, and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons beh ...
. : + → + + While nearly all stable
isotopes Isotopes are two or more types of atoms that have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), and that differ in nucleon numbers (mass numbers) ...
lighter on the
periodic table The periodic table, also known as the periodic table of the (chemical) elements, is a rows and columns arrangement of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of ch ...
than
iron-56 Iron-56 (56Fe) is the most common isotope of iron. About 91.754% of all iron is iron-56. Of all nuclides, iron-56 has the lowest mass per nucleon. With 8.8 MeV binding energy per nucleon, iron-56 is one of the most tightly bound nuclei. N ...
and
nickel-62 Nickel-62 is an isotope of nickel having 28 protons and 34 neutrons. It is a stable isotope, with the highest binding energy per nucleon of any known nuclide (8.7945 MeV). It is often stated that 56Fe is the "most stable nucleus", but only beca ...
, which have the highest binding energy per nucleon, will fuse with some other isotope and release energy, deuterium and tritium are by far the most attractive for energy generation as they require the lowest activation energy (thus lowest temperature) to do so, while producing among the most energy per unit weight. All proto- and mid-life stars radiate enormous amounts of energy generated by fusion processes. Mass for mass, the deuterium–tritium fusion process releases roughly three times as much energy as uranium-235 fission, and millions of times more energy than a chemical reaction such as the burning of coal. It is the goal of a fusion power station to harness this energy to produce electricity. Activation energies (in most fusion systems this is the temperature required to initiate the reaction) for fusion reactions are generally high because the
proton A proton is a stable subatomic particle, symbol , H+, or 1H+ with a positive electric charge of +1 ''e'' elementary charge. Its mass is slightly less than that of a neutron and 1,836 times the mass of an electron (the proton–electron mass ...
s in each nucleus will tend to strongly repel one another, as they each have the same positive
charge Charge or charged may refer to: Arts, entertainment, and media Films * '' Charge, Zero Emissions/Maximum Speed'', a 2011 documentary Music * ''Charge'' (David Ford album) * ''Charge'' (Machel Montano album) * ''Charge!!'', an album by The Aqu ...
. A
heuristic A heuristic (; ), or heuristic technique, is any approach to problem solving or self-discovery that employs a practical method that is not guaranteed to be optimal, perfect, or rational, but is nevertheless sufficient for reaching an immediate, ...
for estimating reaction rates is that nuclei must be able to get within 100
femtometers The magnitudes_.html" ;"title="Magnitude_(mathematics).html" ;"title="atom.html" ;"title="helium helium_atom_and_perspective_Magnitude_(mathematics)">magnitudes_">Magnitude_(mathematics).html"_;"title="atom.html"_;"title="helium_atom">helium_at ...
(1 × 10−13 meter) of each other, where the nuclei are increasingly likely to undergo
quantum tunneling In physics, a quantum (plural quanta) is the minimum amount of any physical entity (physical property) involved in an interaction. The fundamental notion that a physical property can be "quantized" is referred to as "the hypothesis of quantizati ...
past the
electrostatic Electrostatics is a branch of physics that studies electric charges at rest (static electricity). Since classical times, it has been known that some materials, such as amber, attract lightweight particles after rubbing. The Greek word for amber ...
barrier and the turning point where the
strong nuclear force The strong interaction or strong force is a fundamental interaction that confines quarks into proton, neutron, and other hadron particles. The strong interaction also binds neutrons and protons to create atomic nuclei, where it is called the n ...
and the electrostatic force are equally balanced, allowing them to fuse. In ITER, this distance of approach is made possible by high temperatures and magnetic confinement. ITER uses cooling equipment like a cryopump to cool the magnets to close to
absolute zero Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin. The fundamental particles of nature have minimum vibration ...
. High
temperatures Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have relied o ...
give the nuclei enough energy to overcome their
electrostatic repulsion Electrostatics is a branch of physics that studies electric charges at rest ( static electricity). Since classical times, it has been known that some materials, such as amber, attract lightweight particles after rubbing. The Greek word for a ...
(see
Maxwell–Boltzmann distribution In physics (in particular in statistical mechanics), the Maxwell–Boltzmann distribution, or Maxwell(ian) distribution, is a particular probability distribution named after James Clerk Maxwell and Ludwig Boltzmann. It was first defined and use ...
). For deuterium and tritium, the optimal reaction rates occur at temperatures higher than 100 million °C. At ITER, the plasma will be heated to 150 million °C (about ten times the temperature at the core of the
Sun The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ...
) by
ohmic heating Joule heating, also known as resistive, resistance, or Ohmic heating, is the process by which the passage of an electric current through a conductor produces heat. Joule's first law (also just Joule's law), also known in countries of former US ...
(running a current through the plasma). Additional heating is applied using
neutral beam injection Neutral-beam injection (NBI) is one method used to heat plasma inside a fusion device consisting in a beam of high-energy neutral particles that can enter the magnetic confinement field. When these neutral particles are ionized by collision with ...
(which cross magnetic field lines without a net deflection and will not cause a large electromagnetic disruption) and
radio frequency Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around . This is roughly between the upp ...
(RF) or
microwave Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter corresponding to frequencies between 300 MHz and 300 GHz respectively. Different sources define different frequency ran ...
heating. At such high temperatures, particles have a large
kinetic energy In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its accele ...
, and hence velocity. If unconfined, the particles will rapidly escape, taking the energy with them, cooling the plasma to the point where net energy is no longer produced. A successful reactor would need to contain the particles in a small enough volume for a long enough time for much of the plasma to fuse. In ITER and many other
magnetic confinement Magnetic confinement fusion is an approach to generate thermonuclear fusion power that uses magnetic fields to confine fusion fuel in the form of a plasma. Magnetic confinement is one of two major branches of fusion energy research, along with ...
reactors, the plasma, a gas of charged particles, is confined using magnetic fields. A charged particle moving through a
magnetic field A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to ...
experiences a force perpendicular to the direction of travel, resulting in
centripetal acceleration In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by th ...
, thereby confining it to move in a circle or helix around the lines of magnetic flux. ITER will use four types of magnets to contain the plasma: a central solenoid magnet, poloidal magnets around the edges of the tokamak, 18 D-shaped toroidal-field coils, and correction coils. A solid confinement vessel is also needed, both to shield the magnets and other equipment from high temperatures and energetic photons and particles, and to maintain a near-vacuum for the plasma to populate. The containment vessel is subjected to a barrage of very energetic particles, where electrons, ions, photons, alpha particles, and neutrons constantly bombard it and degrade the structure. The material must be designed to endure this environment so that a power station would be economical. Tests of such materials will be carried out both at ITER and at
IFMIF The International Fusion Materials Irradiation Facility, also known as IFMIF, is a projected material testing facility in which candidate materials for the use in an energy producing fusion reactor can be fully qualified. IFMIF will be an acceler ...
(International Fusion Materials Irradiation Facility). Once fusion has begun, high-energy neutrons will radiate from the reactive regions of the plasma, crossing magnetic field lines easily due to charge neutrality (see
neutron flux The neutron flux, φ, is a scalar quantity used in nuclear physics and nuclear reactor physics. It is the total length travelled by all free neutrons per unit time and volume. Equivalently, it can be defined as the number of neutrons travellin ...
). Since it is the neutrons that receive the majority of the energy, they will be ITER's primary source of energy output. Ideally, alpha particles will expend their energy in the plasma, further heating it. The inner wall of the containment vessel will have 440 blanket modules that are designed to slow and absorb neutrons in a reliable and efficient manner and therefore protect the steel structure and the superconducting toroidal field magnets. At later stages of the ITER project, experimental blanket modules will be used to test
breeding Breeding is sexual reproduction that produces offspring, usually animals or plants. It can only occur between a male and a female animal or plant. Breeding may refer to: * Animal husbandry, through selected specimens such as dogs, horses, and ra ...
tritium for fuel from lithium-bearing ceramic pebbles contained within the blanket module following the following reactions: : + → + : + → + + where the reactant neutron is supplied by the D-T fusion reaction. Energy absorbed from the fast neutrons is extracted and passed into the primary coolant. This heat energy would then be used to power an electricity-generating turbine in a real power station; in ITER this electricity generating system is not of scientific interest, so instead the heat will be extracted and disposed of.


Technical design


Vacuum vessel

The vacuum vessel is the central part of the ITER machine: a double-walled steel container in which the plasma is contained by means of magnetic fields. The ITER vacuum vessel will be twice as large and 16 times as heavy as any previously manufactured fusion vessel: each of the nine
torus In geometry, a torus (plural tori, colloquially donut or doughnut) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis that is coplanar with the circle. If the axis of revolution does not tou ...
-shaped sectors will weigh approximately 450 tonnes. When all the shielding and port structures are included, this adds up to a total of 5,116 tonnes. Its external diameter will measure , the internal . Once assembled, the whole structure will be high. The primary function of the vacuum vessel is to provide a hermetically sealed plasma container. Its main components are the main vessel, the port structures and the supporting system. The main vessel is a double-walled structure with poloidal and toroidal stiffening ribs between shells to reinforce the vessel structure. These ribs also form the flow passages for the cooling water. The space between the double walls will be filled with shield structures made of stainless steel. The inner surfaces of the vessel will act as the interface with breeder modules containing the breeder blanket component. These modules will provide shielding from the high-energy neutrons produced by the fusion reactions and some will also be used for tritium breeding concepts. The vacuum vessel has a total of 44 openings that are known as ports – 18 upper, 17 equatorial, and 9 lower ports – that will be used for remote handling operations, diagnostic systems, neutral beam injections and vacuum pumping. Remote handling is made necessary by the radioactive interior of the reactor following a shutdown, which is caused by neutron bombardment during operation. Vacuum pumping will be done before the start of fusion reactions to create the necessary low density environment, which is about one million times lower than the density of air.


Breeder blanket

ITER will use a deuterium-tritium fuel, and while deuterium is abundant in nature, tritium is much rarer because it is a hydrogen isotope with a half-life of just 12.3 years and there is only approximately 3.5 kilograms of natural tritium on earth. Owing to this limited terrestrial supply of
tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...
, a key component of the ITER reactor design is the
breeding blanket The tritium breeding blanket (also known as a fusion blanket, lithium blanket or simply blanket), is a key part of many proposed fusion reactor designs. It serves several purposes; one is to act as a cooling mechanism, absorbing the energy from the ...
. This component, located adjacent to the vacuum vessel, serves to produce tritium through reaction with neutrons from the plasma. There are several reactions that produce tritium within the blanket.
Lithium-6 Naturally occurring lithium (3Li) is composed of two stable isotopes, lithium-6 and lithium-7, with the latter being far more abundant on Earth. Both of the natural isotopes have an unexpectedly low nuclear binding energy per nucleon ( for ...
produces tritium via (n,t) reactions with moderated neutrons, while
Lithium-7 Naturally occurring lithium (3Li) is composed of two stable isotopes, lithium-6 and lithium-7, with the latter being far more abundant on Earth. Both of the natural isotopes have an unexpectedly low nuclear binding energy per nucleon ( for lit ...
produces tritium via interactions with higher energy neutrons via (n,nt) reactions. Concepts for the breeder blanket include helium-cooled lithium lead (HCLL), helium-cooled pebble bed (HCPB), and water-cooled lithium lead (WCLL) methods. Six different tritium breeding systems, known as Test Blanket Modules (TBM), will be tested in ITER and will share a common box geometry. Materials for use as breeder pebbles in the HCPB concept include lithium metatitanate and
lithium orthosilicate Lithium orthosilicate is a compound with the chemical formula Li4SiO4. It is a white ceramic compound, which melts congruently at a temperature of . Lithium orthosilicate is of primary interest towards carbon dioxide capture, as this compound r ...
. Requirements of breeder materials include good tritium production and extraction, mechanical stability and low levels of radioactive activation.


Magnet system

ITER is based on
magnetic confinement fusion Magnetic confinement fusion is an approach to generate thermonuclear fusion power that uses magnetic fields to confine fusion fuel in the form of a plasma. Magnetic confinement is one of two major branches of fusion energy research, along with ...
that uses magnetic fields to contain the fusion fuel in plasma form. The magnet system used in the ITER tokamak will be the largest superconducting magnet system ever built. The system will use four types of magnets to achieve plasma confinement: a central solenoid magnet, poloidal magnets, toroidal-field coils, and correction coils. The central
solenoid upright=1.20, An illustration of a solenoid upright=1.20, Magnetic field created by a seven-loop solenoid (cross-sectional view) described using field lines A solenoid () is a type of electromagnet formed by a helix, helical coil of wire whose ...
coil will be 18 meters tall, 4.3 meters wide, and weigh 1000 tonnes. It will use
superconducting Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic flux fields are expelled from the material. Any material exhibiting these properties is a superconductor. Unlike ...
niobium-tin to carry 45 kA and produce a peak field of more than 13 teslas. The 18 toroidal field coils will also use niobium-tin. They are the most powerful superconductive magnets ever designed with a nominal peak field strength of 11.8 teslas and a stored magnetic energy of 41
gigajoule The joule ( , ; symbol: J) is the unit of energy in the International System of Units (SI). It is equal to the amount of work done when a force of 1 newton displaces a mass through a distance of 1 metre in the direction of the force applied. ...
s. Other lower field ITER magnets (poloidal field and correction coils) will use niobium-titanium for their superconducting elements.


Additional heating

To achieve fusion, plasma particles must be heated to temperatures that reach as high as 150 million °C and to achieve these extreme temperatures multiple heating methods must be used. Within the tokamak itself, changing magnetic fields produce a heating effect but external heating is also required. There will be three types of external heating in ITER: * Two one-million volt heating neutral beam injectors (HNB) that will each provide about 16.5MW to the burning plasma, with the possibility to add a third injector. The beams generate electrically charged deuterium ions that are accelerated through five grids to reach the required energy of 1MV and the beams can operate for the entire plasma pulse duration, a total of up to 3600 seconds. The prototype is being built at the Neutral Beam Test Facility (NBTF), which was constructed in
Padua Padua ( ; it, Padova ; vec, Pàdova) is a city and ''comune'' in Veneto, northern Italy. Padua is on the river Bacchiglione, west of Venice. It is the capital of the province of Padua. It is also the economic and communications hub of the ...
, Italy. There is also a smaller neutral beam that will be used for diagnostics to help detect the amount of helium ash inside the tokamak. * An
ion cyclotron resonance heating Ion cyclotron resonance is a phenomenon related to the movement of ions in a magnetic field. It is used for accelerating ions in a cyclotron, and for measuring the masses of an ionized analyte in mass spectrometry, particularly with Fourier transf ...
(ICRH) system that will inject 20 MW of electromagnetic power into the plasma by using antennas to generate radio waves that have the same rate of oscillation as the ions in the plasma. * An
electron cyclotron resonance heating A tokamak (; russian: токамáк; otk, 𐱃𐰸𐰢𐰴, Toḳamaḳ) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being ...
(ECRH) system that will heat electrons in the plasma using a high-intensity beam of electromagnetic radiation.


Cryostat

The ITER cryostat is a large 3,850-tonne stainless steel structure surrounding the vacuum vessel and the superconducting magnets, with the purpose of providing a super-cool vacuum environment. Its thickness (ranging from ) will allow it to withstand the stresses induced by atmospheric pressure acting on the enclosed volume of 8,500 cubic meters. On 9 June 2020,
Larsen & Toubro Larsen & Toubro Ltd, commonly known as L&T, is an Indian multinational conglomerate company, with business interests in engineering, construction, manufacturing, technology, information technology and financial services, headquartered in Mumba ...
completed the delivery and installation of the cryostat module. The cryostat is the major component of the tokamak complex, which sits on a seismically isolated base.


Divertor

The
divertor In nuclear fusion power research, a divertor is a device within a tokamak or a stellarator that allows the online removal of waste material from the plasma while the reactor is still operating. This allows control over the buildup of fusion pro ...
is a device within the tokamak that allows for removal of waste and impurities from the plasma while the reactor is operating. At ITER, the divertor will extract heat and ash that are created by the fusion process, while also protecting the surrounding walls and reducing plasma contamination. The ITER divertor, which has been compared to a massive ashtray, is made of 54 pieces of stainless-steel parts that are known as cassettes. Each cassette weighs roughly eight tonnes and measures 0.8 meters x 2.3 meters by 3.5 meters. The divertor design and construction is being overseen by the Fusion For Energy agency. When the ITER tokamak is in operation, the plasma-facing units endure heat spikes as high as 20 megawatts per square metre, which is more than four times higher than what is experienced by a spacecraft entering Earth's atmosphere. The testing of the divertor is being done at the ITER Divertor Test Facility (IDTF) in Russia. This facility was created at the Efremov Institute in
Saint Petersburg Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), i ...
as part of the ITER Procurement Arrangement that spreads design and manufacturing across the project's member countries.


Cooling systems

The ITER tokamak will use interconnected cooling systems to manage the heat generated during operation. Most of the heat will be removed by a primary water cooling loop, itself cooled by water from a secondary loop through a heat exchanger within the tokamak building's secondary confinement. The secondary cooling loop will be cooled by a larger complex, comprising a cooling tower, a pipeline supplying water from the Canal de Provence, and basins that allow cooling water to be cooled and tested for chemical contamination and
tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...
before being released into the river
Durance The Durance (; ''Durença'' in the Occitan classical norm or ''Durènço'' in the Mistralian norm) is a major river in Southeastern France. A left tributary of the Rhône, it is long. Its drainage basin is .liquid nitrogen Liquid nitrogen—LN2—is nitrogen in a liquid state at low temperature. Liquid nitrogen has a boiling point of about . It is produced industrially by fractional distillation of liquid air. It is a colorless, low viscosity liquid that is wide ...
system will provide a further of cooling to , and a
liquid helium Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures. Liquid helium may show superfluidity. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temp ...
system will provide of cooling to . The liquid helium system will be designed, manufactured, installed and commissioned by
Air Liquide Air Liquide S.A. (; ; literally "liquid air"), is a French multinational company which supplies industrial gases and services to various industries including medical, chemical and electronic manufacturers. Founded in 1902, after Linde it is ...
in France.


Location

The process of selecting a location for ITER was long and drawn out. Japan proposed a site in Rokkasho. Two European sites were considered, the
Cadarache Cadarache is the largest technological research and development centre for energy in Europe. It includes the CEA research activities and ITER. CEA Cadarache is one of the 10 research centres of the French Commission of Atomic and Alternative En ...
site in France and the Vandellòs site in Spain, but the European Competitiveness Council named Caderache as its official candidate in November 2003. Additionally, Canada announced a bid for the site in
Clarington Clarington ( 2021 population 101,427) is a lower-tier municipality in the Regional Municipality of Durham in Ontario, Canada. It was incorporated in 1973 as the town of Newcastle with the merging of the town of Bowmanville, the Village of Newca ...
in May 2001, but withdrew from the race in 2003. From this point on, the choice was between France and Japan. On 3 May 2005, the EU and Japan agreed to a process which would settle their dispute by July. At the final meeting in Moscow on 28 June 2005, the participating parties agreed to construct ITER at Cadarache with Japan receiving a privileged partnership that included a Japanese director-general for the project and a financial package to construct facilities in Japan.
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
, the EU agency in charge of the European contribution to the project, is located in
Barcelona Barcelona ( , , ) is a city on the coast of northeastern Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second most populous municipality of Spain. With a population of 1.6 million within ci ...
, Spain. Fusion for Energy (F4E) is the European Union's Joint Undertaking for ITER and the Development of Fusion Energy. According to the agency's website:
F4E is responsible for providing Europe's contribution to ITER, the world's largest scientific partnership that aims to demonstrate fusion as a viable and sustainable source of energy. ..F4E also supports fusion research and development initiatives ../blockquote> The ITER Neutral Beam Test Facility aimed at developing and optimizing the neutral beam injector prototype, is being constructed in
Padova Padua ( ; it, Padova ; vec, Pàdova) is a city and ''comune'' in Veneto, northern Italy. Padua is on the river Bacchiglione, west of Venice. It is the capital of the province of Padua. It is also the economic and communications hub of the ...
,
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re ...
. It will be the only ITER facility out of the site in Cadarache. Most of the buildings at ITER will or have been clad in an alternating pattern of reflective stainless steel and grey lacquered metal. This was done for aesthetic reasons to blend the buildings with their surrounding environment and to aid with thermal insulation.


Participants

Currently there are seven signatories to the ITER Agreement:
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
, the
European Union The European Union (EU) is a supranational political and economic union of member states that are located primarily in Europe. The union has a total area of and an estimated total population of about 447million. The EU has often been des ...
,
India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
,
Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
,
South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korea, Korean Peninsula and sharing a Korean Demilitarized Zone, land border with North Korea. Its western border is formed ...
and the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
. As a consequence of
Brexit Brexit (; a portmanteau of "British exit") was the withdrawal of the United Kingdom (UK) from the European Union (EU) at 23:00 GMT on 31 January 2020 (00:00 1 February 2020 CET).The UK also left the European Atomic Energy Community (EAEC or ...
, the United Kingdom formally withdrew from Euratom on 31 January 2020. However, under the terms of the
EU–UK Trade and Cooperation Agreement The EU–UK Trade and Cooperation Agreement (TCA) is a free trade agreement signed on 30 December 2020, between the European Union (EU), the European Atomic Energy Community (Euratom), and the United Kingdom (UK). It provisionally applied from ...
, the United Kingdom remains a member of ITER as a part of
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
following the end of the
transition period The Brexit withdrawal agreement, officially titled Agreement on the withdrawal of the United Kingdom of Great Britain and Northern Ireland from the European Union and the European Atomic Energy Community, is a treaty between the European Uni ...
on 31 December 2020. In March 2009, Switzerland, an associate member of
Euratom The European Atomic Energy Community (EAEC or Euratom) is an international organisation established by the Euratom Treaty on 25 March 1957 with the original purpose of creating a specialist market for nuclear power in Europe, by developing nucl ...
since 1979, also ratified the country's accession to the
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
as a third country member. In 2016, ITER announced a partnership with Australia for "technical cooperation in areas of mutual benefit and interest", but without Australia becoming a full member. In 2017, ITER signed a Cooperation Agreement with
Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...
. Thailand also has an official role in the project after a cooperation agreement was signed between the ITER Organization and the Thailand Institute of Nuclear Technology in 2018. The agreement provides courses and lectures to students and scientists in Thailand and facilitates relationships between Thailand and the ITER project. Canada was previously a full member but pulled out due to a lack of funding from the federal government. The lack of funding also resulted in Canada's withdrawing from its bid for the ITER site in 2003. Canada rejoined the project in 2020 via a cooperation agreement that focused on tritium and tritium-related equipment. ITER's work is supervised by the ITER Council, which has the authority to appoint senior staff, amend regulations, decide on budgeting issues, and allow additional states or organizations to participate in ITER. The current Chairman of the ITER Council is Won Namkung, and the acting ITER Director-General is Eisuke Tada.


Members

* ** (as a member of
Euratom The European Atomic Energy Community (EAEC or Euratom) is an international organisation established by the Euratom Treaty on 25 March 1957 with the original purpose of creating a specialist market for nuclear power in Europe, by developing nucl ...
and
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
) ** (as a part of
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
) * * * * * *


Non-members

* (through the
Australian Nuclear Science and Technology Organisation The Australian Nuclear Science and Technology Organisation (ANSTO) is a statutory body of the Australian government, formed in 1987 to replace the Australian Atomic Energy Commission. Its head office and main facilities are in southern outs ...
(ANSTO) in 2016) * (through the
Government of Canada The government of Canada (french: gouvernement du Canada) is the body responsible for the federal administration of Canada. A constitutional monarchy, the Crown is the corporation sole, assuming distinct roles: the executive, as the ''Crown ...
in 2020, mostly on the grounds of
tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...
) * (through the National Nuclear Center of the Republic of Kazakhstan (NNC-RK) in 2017) * (through the
Thailand Institute of Nuclear Technology The Thailand Institute of Nuclear Technology (TINT) (สถาบันเทคโนโลยีนิวเคลียร์แห่งชาติ) is a public organization in Bangkok, Thailand. Overview The institute is an entity establis ...
(TINT) in 2018)


Domestic agencies

Each member of the ITER project – The European Union, China, India, Japan, Korea, Russia, and the United States – has created a domestic agency to meet its contributions and procurement responsibilities. These agencies employ their own staff, have their own budget, and directly oversee all industrial contracts and subcontracting.


ITER EU

The ITER Agreement was signed by
Euratom The European Atomic Energy Community (EAEC or Euratom) is an international organisation established by the Euratom Treaty on 25 March 1957 with the original purpose of creating a specialist market for nuclear power in Europe, by developing nucl ...
representing the EU.
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
, often referred to as F4E, was created in 2007 as the EU's domestic agency, with headquarters in
Barcelona Barcelona ( , , ) is a city on the coast of northeastern Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second most populous municipality of Spain. With a population of 1.6 million within ci ...
, Spain, and further offices in
Cadarache Cadarache is the largest technological research and development centre for energy in Europe. It includes the CEA research activities and ITER. CEA Cadarache is one of the 10 research centres of the French Commission of Atomic and Alternative En ...
, France, Garching, Germany, and
Rokkasho is a village in Aomori Prefecture, Japan. , the village had an estimated population of 10,200, and a population density of 40 persons per km², in 4,855 households. The total area of the village is . Geography Rokkasho occupies the eastern coa ...
, Japan. F4E is responsible for contributing to the design and manufacture of components such as the vacuum vessel, the divertor, and the magnets.


ITER China

China's contribution to ITER is managed through the China International Nuclear Fusion Energy Program or the CNDA. The Chinese agency is working on components such as the correction coil, magnet supports, the first wall, and shield blanket. China is also running experiments on their
HL-2M HL-2M is a research tokamak at the Southwestern Institute of Physics in Chengdu, China. It was completed on November 26, 2019 and commissioned on December 4, 2020. HL-2M is now used for nuclear fusion research, in particular to study heat extractio ...
tokamak in
Chengdu Chengdu (, ; Simplified Chinese characters, simplified Chinese: 成都; pinyin: ''Chéngdū''; Sichuanese dialects, Sichuanese pronunciation: , Standard Chinese pronunciation: ), Chinese postal romanization, alternatively Romanization of Chi ...
and HT-7U (
EAST East or Orient is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the fa ...
) in
Hefei Hefei (; ) is the capital and largest city of Anhui Province, People's Republic of China. A prefecture-level city, it is the political, economic, and cultural center of Anhui. Its population was 9,369,881 as of the 2020 census and its built-up ( ...
to help support ITER research.


ITER India

ITER-India is a special project run by India's Institute for Plasma Research. ITER-India's research facility is based in
Ahmedabad Ahmedabad ( ; Gujarati: Amdavad ) is the most populous city in the Indian state of Gujarat. It is the administrative headquarters of the Ahmedabad district and the seat of the Gujarat High Court. Ahmedabad's population of 5,570,585 (per t ...
in the
Gujarat Gujarat (, ) is a state along the western coast of India. Its coastline of about is the longest in the country, most of which lies on the Kathiawar peninsula. Gujarat is the fifth-largest Indian state by area, covering some ; and the ninth ...
state. India's deliverables to the ITER project include the cryostat, in-vessel shielding, cooling and cooling water systems.


ITER Japan

Japan's National Institutes for Quantum and Radiological Sciences and Technology, or QST, is now the designated Japanese domestic agency for the ITER project. The organization is based in
Chiba Chiba may refer to: Places China * (), town in Jianli County, Jingzhou, Hubei Japan * Chiba (city), capital of Chiba Prefecture ** Chiba Station, a train station * Chiba Prefecture, a sub-national jurisdiction in the Greater Tokyo Area on ...
, Japan. Japan collaborates with the ITER Organization and ITER members to help design and produce components for the tokamak, including the blanket remote handling system, the central solenoid coils, the plasma diagnostics systems, and the neutral beam injection heating systems.


ITER Korea

ITER Korea was established in 2007 under Korea's National Fusion Research Institute and the organization is based in
Daejeon Daejeon () is South Korea's fifth-largest metropolis, with a population of 1.5 million as of 2019. Located in the central-west region of South Korea alongside forested hills and the Geum River, the city is known both for its technology and ...
, South Korea. Among the procurement items that ITER Korea is responsible for four sectors of the vacuum vessel, the blanket shield block, thermal shields, and the tritium storage and delivery system.


ITER Russia

Russia occupies one of the key positions in the implementation of the international ITER Project. The Russian Federation's contribution to the ITER project lies in the manufacture and supply of high-tech equipment and basic reactor systems. The Russian Federation's contribution is being made under the aegis of
Rosatom Rosatom, ( rus, Росатом, p=rɐsˈatəm}) also known as Rosatom State Nuclear Energy Corporation, the State Atomic Energy Corporation Rosatom or Rosatom State Corporation, is a Russian state corporation headquartered in Moscow that speciali ...
or the State Atomic Energy Corporation. The Russian Federation has multiple obligations to the ITER project, including the supply of 22 kilometers of conductors based on 90 tonnes of superconducting Nb3Sn strands for winding coils of a toroidal field and 11 km of conductors based on 40 tonnes of superconducting Nb Ti strands for windings of coils of a
poloidal field The terms toroidal and poloidal refer to directions relative to a torus of reference. They describe a three-dimensional coordinate system in which the poloidal direction follows a small circular ring around the surface, while the toroidal direct ...
of the ITER magnetic system, sent in late 2022. Russia is responsible for the manufacture of 179 of the most energy-intensive (up to 5 MW/sq.m) panels of the First Wall. The panels are covered with
beryllium Beryllium is a chemical element with the symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. It is a divalent element that occurs naturally only in combination with other elements to form mi ...
plates soldered to Cu Cr Zr bronze, which is connected to a steel base. Panel size up to 2 m wide, 1.4 m high; its mass is about 1000 kg. The obligation of the Russian Federation also includes conducting thermal tests of ITER components that are facing the plasma. Today, Russia, thanks to its participation in the Project, has the full design documentation for the ITER reactor.


ITER US

US ITER is part of the US Department of Energy and is managed by the
Oak Ridge National Laboratory Oak Ridge National Laboratory (ORNL) is a U.S. multiprogram science and technology national laboratory sponsored by the U.S. Department of Energy (DOE) and administered, managed, and operated by UT–Battelle as a federally funded research and ...
in Tennessee. US ITER is responsible for both the design and manufacturing of components for the ITER project, and American involvement includes contributions to the tokamak cooling system, the diagnostics systems, the electron and ion cyclotron heating transmission lines, the toroidal and central solenoid magnet systems, and the pellet injection systems.


Funding

In 2006, the ITER Agreement was signed on the basis of an estimated cost of €5.9 billion over a ten-year period. In 2008, as a result of a design review, the estimate was revised upwards to approximately €19 billion. As of 2016, the total price of constructing and operating the experiment is expected to be in excess of €22 billion, an increase of €4.6 billion of its 2010 estimate, and of €9.6 billion from the 2009 estimate. At the June 2005 conference in Moscow the participating members of the ITER cooperation agreed on the following division of funding contributions for the construction phase: 45.4% by the hosting member, the European Union, and the rest split between the non-hosting members at a rate of 9.1% each for China, India, Japan, South Korea, the Russian Federation and the USA. During the operation and deactivation phases, Euratom will contribute to 34% of the total costs, Japan and the United States 13 percent, and China, India, Korea, and Russia 10 percent. Ninety percent of contributions will be delivered 'in-kind' using ITER's own currency, the ITER Units of Account (IUAs). Although Japan's financial contribution as a non-hosting member is one-eleventh of the total, the EU agreed to grant it a special status so that Japan will provide for two-elevenths of the research staff at Cadarache and be awarded two-elevenths of the construction contracts, while the European Union's staff and construction components contributions will be cut from five-elevenths to four-elevenths. The American contribution to ITER has been the subject to debate. The U.S. Department of Energy has estimated the total construction costs to 2025, including in-kind contributions, to be $65 billion, although ITER disputes this calculation. After having reduced funding to ITER in 2017, the United States ended up doubling its initial budget to $122 million in-kind contribution in 2018. It is estimated the total contribution to ITER for the year 2020 was $247 million, an amount that is part of the U.S. Department of Energy's Fusion Energy Sciences program. Under a strategic plan to guide American fusion energy efforts that was approved in January 2021, the U.S. Department of Energy directed the Fusion Energy Sciences Advisory Committee to assume that the U.S. will continue to fund ITER for a ten-year period. Support for the European budget for ITER has also varied over the course of the project. It was reported in December 2010 that the European Parliament had refused to approve a plan by member states to reallocate €1.4 billion from the budget to cover a shortfall in ITER building costs in 2012–13. The closure of the 2010 budget required this financing plan to be revised, and the European Commission (EC) was forced to put forward an ITER budgetary resolution proposal in 2011. In the end, the European contribution to ITER for the 2014 to 2020 period was set at €2.9 billion. Most recently, in February 2021, the European Council approved ITER financing of €5.61 billion for the period of 2021 to 2027.


Manufacturing

The construction of the ITER tokamak has been compared to the assembly of “a giant three-dimensional puzzle” because the parts are manufactured around the world and then shipped to France for assembly. This assembly system is the result of the ITER Agreement that stipulates that member contributions were to be mostly “in-kind” with countries manufacturing components instead of providing money. This system was devised to provide economic stimulus and fusion expertise in the countries funding the project and the general framework called for 90% of member contributions to be in material or components and 10% to be in money. As a result, more than 2800 design or manufacturing contracts have been signed since the launch of the project. According to a 2017 estimate from French Minister for Research, Education and Innovation,
Frédérique Vidal Frédérique Vidal (born 9 May 1964) is a Monegasque-born French-based biochemist, academic administrator, and politician who served as Minister of Higher Education, Research and Innovation in the government of Prime Ministers Édouard Philippe ...
, there were 500 companies involved in the construction of ITER and Bernard Bigot stated that €7 billion in contracts had been awarded to prime contractors in Europe alone since 2007. The overall assembly of the tokamak facility is being overseen through a €174-million contract awarded to Momentum, a joint venture between
Amec Foster Wheeler Amec Foster Wheeler plc was a British multinational consultancy, engineering and project management company headquartered in London, United Kingdom. In October 2017, it was acquired by Wood Group. It was focused on the Oil, Gas & Chemicals, M ...
(Britain),
Assystem Assystem is an independent engineering group based in Paris. It provides services in the design, construction supervision, commissioning and operation of a client's industrial infrastructure. It had revenues of over €470M in 2020, down from €8 ...
(France), and Kepco (South Korea). One of the largest tenders was a €530-million contract for HVAC systems and mechanical and electrical equipment that was awarded to a European consortium involving
ENGIE Engie SA is a French multinational utility company, headquartered in La Défense, Courbevoie, which operates in the fields of energy transition, electricity generation and distribution, natural gas, nuclear, renewable energy and petroleum. ...
(France) and
Exyte Exyte is an international company for design, engineering, procurement, and construction in controlled and regulated environments. Its headquarters are located in Stuttgart (Germany). Exyte's core business includes solutions for the semiconducto ...
(Germany). A tokamak assembly contract worth €200 million also went to a European consortium, Dynamic, that includes the companies
Ansaldo Energia Ansaldo Energia S.p.A. is an Italian power engineering company. It is based in Genoa, Italy. The absorbed parent company, Gio. Ansaldo & C., started in 1853. It was taken over by Leonardo S.p.A. In 2011, Leonardo S.p.A. sold 45% stake in Ansa ...
(Italy),
ENGIE Engie SA is a French multinational utility company, headquartered in La Défense, Courbevoie, which operates in the fields of energy transition, electricity generation and distribution, natural gas, nuclear, renewable energy and petroleum. ...
(France), and SIMIC (Italy). The French industrial conglomerate
Daher Daher, or DAHER, is a French industrial conglomerate. It is operational across the aerospace, defence, nuclear, and automotive industrial sectors in the fields of manufacturing, services, and transport. It was founded in 1863 as a shipping ...
was awarded more than €100 million in logistics contracts for ITER, which includes the shipment of the heavy components from the different manufacturers around the world. In America, US ITER has awarded $1.3 billion in contracts to American companies since the beginning of the project and there is an estimated $800 million in future contracts still to come. The major US contracts include
General Atomics General Atomics is an American energy and defense corporation headquartered in San Diego, California, specializing in research and technology development. This includes physics research in support of nuclear fission and nuclear fusion energy. The ...
being selected to design and manufacture the crucial central solenoid magnet. In 2019, the Chinese consortium led by China Nuclear Power Engineering Corporation signed a contract for machine assembly at ITER that was the biggest nuclear energy contract ever signed by a Chinese company in Europe. Russia is supplying magnet and vacuum-injection systems for ITER with construction being done at the
Sredne-Nevsky Shipyard The Middle Neva Shipbuilding Plant (russian: Средне-Невский судостроительный завод, Sredne-Nevskiy sudostroitelnyy zavod) was founded before the end of the 19th century in Saint Petersburg, Russia. In 1917 it emplo ...
in Saint Petersburg. In India, the contract for construction of the cryostat, one of the fundamental pieces of the tokamak, was awarded to
Larsen & Toubro Larsen & Toubro Ltd, commonly known as L&T, is an Indian multinational conglomerate company, with business interests in engineering, construction, manufacturing, technology, information technology and financial services, headquartered in Mumba ...
, who also have ITER contracts for water cooling systems. Two of Japan's industrial leaders, Toshiba Energy Systems & Solutions and
Mitsubishi Heavy Industries is a Japanese multinational engineering, electrical equipment and electronics corporation headquartered in Tokyo, Japan. MHI is one of the core companies of the Mitsubishi Group and its automobile division is the predecessor of Mitsubishi Mo ...
, have contracts to manufacture the toroidal field coils for ITER. Construction of another key part of the tokamak, the vacuum vessel, was awarded to
Hyundai Heavy Industries Hyundai Heavy Industries Co., Ltd. (HHI; ) is the world's largest shipbuilding company and a major heavy equipment manufacturer. Its headquarters are in Ulsan, South Korea. History HHI was founded in 1972 by Chung Ju-yung as a division of the ...
and is being built in Korea.


Criticism

The ITER project has been criticized for issues such as its possible environmental impacts, its usefulness as a response to climate change, the design of its tokamak, and how the experiment's objectives have been expressed. When France was announced as the site of the ITER project in 2005, several European environmentalists stated their opposition to the project. For example, the French politician
Noël Mamère Noël Mamère (born 25 December 1948 in Libourne, Gironde) is a French journalist and politician. He was the mayor of Bègles in Gironde as well as deputy to the French National Assembly for that constituency. He was for several years a member ...
argued that the fight against global warming would be neglected as a result of ITER: “This is not good news for the fight against the greenhouse effect because we're going to put ten billion euros towards a project that has a term of 30–50 years when we're not even sure it will be effective." However, another French environmental association Association des Ecologistes Pour le Nucléaire (AEPN) welcomed the ITER project as an important part of the response to climate change. Within the broader fusion sector, a number of researchers working on non-tokamak systems, such as the independent fusion scientist Eric Lerner, have argued that other fusion projects would be a fraction of ITER's cost and could be a potentially more viable and/or more cost-effective path to fusion power. Other critics, such as Daniel Jassby, accuse ITER researchers of being unwilling to face up to the technical and economic potential problems posed by tokamak fusion schemes. In terms of the design of the tokamak, one concern arose from the 2013 tokamak parameters database interpolation that revealed the power load on a tokamak
divertor In nuclear fusion power research, a divertor is a device within a tokamak or a stellarator that allows the online removal of waste material from the plasma while the reactor is still operating. This allows control over the buildup of fusion pro ...
would be five times the previously expected value. Given that the projected power load on the ITER divertor will already be very high, these new findings led to new design testing initiatives.Innovation is Key from ITER to DEMO. Dec 2013
Porkolab. MIT
Another issue that critics raised regarding ITER and future deuterium-tritium (DT) fusion projects is the available supply of tritium. As it stands, ITER will use all existing supplies of tritium for its experiment and the current state-of-the-art technology isn't sufficient to generate enough tritium to fulfill the needs of future DT fuel cycle experiments for fusion energy. According to the conclusion of a 2020 study that analyzed the tritium issue, “successful development of the DT fuel cycle for DEMO and future fusion reactors requires an intensive R&D program in key areas of plasma physics and fusion technologies.”


Responses to criticism

Proponents believe that much of the ITER criticism is misleading and inaccurate, in particular the allegations of the experiment's "inherent danger". The stated goals for a commercial fusion power station design are that the amount of
radioactive waste Radioactive waste is a type of hazardous waste that contains radioactive material. Radioactive waste is a result of many activities, including nuclear medicine, nuclear research, nuclear power generation, rare-earth mining, and nuclear weapons r ...
produced should be hundreds of times less than that of a fission reactor, and that it should produce no long-lived radioactive waste, and that it is impossible for any such reactor to undergo a large-scale runaway chain reaction. A direct contact of the plasma with ITER inner walls would contaminate it, causing it to cool immediately and stop the fusion process. In addition, the amount of fuel contained in a fusion reactor chamber (one half gram of deuterium/tritium fuelITER website
Iter.org. Retrieved 21 May 2013.
) is only sufficient to sustain the fusion burn pulse from minutes up to an hour at most, whereas a fission reactor usually contains several years' worth of fuel. Moreover, some detritiation systems will be implemented, so that, at a fuel cycle inventory level of about , ITER will eventually need to recycle large amounts of tritium and at turnovers orders of magnitude higher than any preceding tritium facility worldwide. In the case of an accident (or sabotage), it is expected that a fusion reactor would release far less radioactive pollution than would an ordinary fission nuclear station. Furthermore, ITER's type of fusion power has little in common with nuclear weapons technology, and does not produce the fissile materials necessary for the construction of a weapon. Proponents note that large-scale fusion power would be able to produce reliable electricity on demand, and with virtually zero pollution (no gaseous CO2, SO2, or NOx by-products are produced). According to researchers at a demonstration reactor in Japan, a fusion generator should be feasible in the 2030s and no later than the 2050s. Japan is pursuing its own research program with several operational facilities that are exploring several fusion paths. In the United States alone, electricity accounts for US$210 billion in annual sales. Asia's electricity sector attracted US$93 billion in private investment between 1990 and 1999. These figures take into account only current prices. Proponents of ITER contend that an investment in research now should be viewed as an attempt to earn a far greater future return and a 2017–18 study of the impact of ITER investments on the EU economy have concluded that 'in the medium and long-term, there is likely to be a positive return on investment from the EU commitment to ITER.' Also, worldwide investment of less than US$1 billion per year into ITER is not incompatible with concurrent research into other methods of power generation, which in 2007 totaled US$16.9 billion. Supporters of ITER emphasize that the only way to test ideas for withstanding the intense neutron flux is to subject materials experimentally to that flux, which is one of the primary missions of ITER and the IFMIF, and both facilities will be vitally important to that effort. The purpose of ITER is to explore the scientific and engineering questions that surround potential fusion power stations. It is nearly impossible to acquire satisfactory data for the properties of materials expected to be subject to an intense neutron flux, and burning plasmas are expected to have quite different properties from externally heated plasmas. Supporters contend that the answer to these questions requires the ITER experiment, especially in the light of the monumental potential benefits. Furthermore, the main line of research via
tokamak A tokamak (; russian: токамáк; otk, 𐱃𐰸𐰢𐰴, Toḳamaḳ) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being d ...
s has been developed to the point that it is now possible to undertake the penultimate step in magnetic confinement plasma physics research with a self-sustained reaction. In the tokamak research program, recent advances devoted to controlling the configuration of the plasma have led to the achievement of substantially improved energy and pressure confinement, which reduces the projected cost of electricity from such reactors by a factor of two to a value only about 50% more than the projected cost of electricity from advanced light-water reactors.Commentaries on criticisms of magnetic fusion
Weston M. Stacey, Georgia Institute of Technology, March 1999
In addition, progress in the development of advanced, low activation structural materials supports the promise of environmentally benign fusion reactors and research into alternate confinement concepts is yielding the promise of future improvements in confinement. Finally, supporters contend that other potential replacements to the fossil fuels have environmental issues of their own. Solar,
wind Wind is the natural movement of air or other gases relative to a planet's surface. Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few hou ...
, and
hydroelectric Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and ...
power all have very low
surface power density In physics and engineering, surface power density is power per unit area. Applications * The intensity of electromagnetic radiation can be expressed in W/m2. An example of such a quantity is the solar constant. * Wind turbines are often compared ...
compared to ITER's successor DEMO which, at 2,000 MW, would have an energy density that exceeds even large fission power stations. Safety of the project is regulated according to French and EU nuclear power regulations. In 2011, the French Nuclear Safety Authority (ASN) delivered a favorable opinion, and then, based on the French Act on Nuclear Transparency and Safety, the licensing application was subject to public enquiry that allowed the general public to submit requests for information regarding safety of the project. According to published safety assessments (approved by the ASN), in the worst case of reactor leak, released radioactivity will not exceed 1/1000 of natural background radiation and no evacuation of local residents will be required. The whole installation includes a number of stress tests to confirm efficiency of all barriers. The whole reactor building is built on top of almost 500 seismic suspension columns and the whole complex is located almost 300 m above sea level. Overall, extremely rare events such as 100-year flood of the nearby Durance river and 10,000-year earthquakes were assumed in the safety design of the complex and respective safeguards are part of the design. Between 2008 and 2017, the project has generated 34,000 job-years in the EU economy alone. It is estimated that in the 2018–2030 period, it will generate a further 74,000 job-years and €15.9 billion in gross value.


Similar projects

Precursors to ITER were
EAST East or Orient is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the fa ...
, SST-1,
KSTAR The KSTAR (or Korea Superconducting Tokamak Advanced Research; ko, 초전도 핵융합연구장치, literally "superconducting nuclear fusion research device") is a magnetic fusion device at the Korea Institute of Fusion Energy in Daejeon, So ...
, JET, and
Tore Supra WEST, Tungsten (chemical symbol "W") Environment in Steady-state Tokamak, (formerly Tore Supra) is a French tokamak that originally began operating as Tore Supra after the discontinuation of TFR (Tokamak of Fontenay-aux-Roses) and of Petula (in G ...
. Other planned and proposed fusion reactors include
SPARC SPARC (Scalable Processor Architecture) is a reduced instruction set computer (RISC) instruction set architecture originally developed by Sun Microsystems. Its design was strongly influenced by the experimental Berkeley RISC system developed ...
,
DEMO Demo, usually short for demonstration, may refer to: Music and film *Demo (music), a song typically recorded for reference rather than release * ''Demo'' (Behind Crimson Eyes), a 2004 recording by the band Behind Crimson Eyes * ''Demo'' (Deafhea ...
, NIF,
HiPER The High Power laser Energy Research facility (HiPER), is a proposed experimental laser-driven inertial confinement fusion (ICF) device undergoing preliminary design for possible construction in the European Union. , the effort appears to be i ...
, MAST, SST-2, CFETR, T-15MD and other 'DEMO-phase' national or private-sector fusion power plants.


See also

*
Alcator C-Mod Alcator C-Mod was a tokamak (a type of magnetically confined fusion device) that operated between 1991 and 2016 at the Massachusetts Institute of Technology (MIT) Plasma Science and Fusion Center (PSFC). Notable for its high toroidal magnetic ...
, third-generation, high plasma-pressure tokamak at
MIT The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of the m ...
in U.S.; operated 1991-2016 *
Atoms for Peace "Atoms for Peace" was the title of a speech delivered by U.S. President Dwight D. Eisenhower to the UN General Assembly in New York City on December 8, 1953. The United States then launched an "Atoms for Peace" program that supplied equipment ...
, 1953 U.S. offer of Pres.
Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; ; October 14, 1890 – March 28, 1969) was an American military officer and statesman who served as the 34th president of the United States from 1953 to 1961. During World War II, ...
to
U.N. The United Nations (UN) is an intergovernmental organization whose stated purposes are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a centre for harmonizi ...
to share civilian nuclear technology * Baruch Plan, 1946 U.S. proposal to
U.N. The United Nations (UN) is an intergovernmental organization whose stated purposes are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a centre for harmonizi ...
to transfer to other nations non-weapons nuclear technology *
COLEX process The COLEX process (or COLEX separation) is a chemical method of isotopic separation of lithium-6 and lithium-7, based on the use of mercury. COLEX stands for column exchange. Since the beginning of the atomic era, a variety of lithium enrichments ...
, a method of
isotopic separation Isotope separation is the process of concentrating specific isotopes of a chemical element by removing other isotopes. The use of the nuclides produced is varied. The largest variety is used in research (e.g. in chemistry where atoms of "marker" n ...
of
lithium-6 Naturally occurring lithium (3Li) is composed of two stable isotopes, lithium-6 and lithium-7, with the latter being far more abundant on Earth. Both of the natural isotopes have an unexpectedly low nuclear binding energy per nucleon ( for ...
&
lithium-7 Naturally occurring lithium (3Li) is composed of two stable isotopes, lithium-6 and lithium-7, with the latter being far more abundant on Earth. Both of the natural isotopes have an unexpectedly low nuclear binding energy per nucleon ( for lit ...
for uses in nuclear applications *
DEMOnstration Power Plant DEMO refers to a proposed class of nuclear fusion experimental reactors that are intended to demonstrate the net production of electric power from nuclear fusion. Most of the ITER partners have plans for their own DEMO-class reactors. With the ...
or DEMO, the next step, at least 15% larger than ITER and the first to produce electricity * Fusenet, European Fusion Education Network, 2008–2013 *
Fusion for Energy Fusion for Energy (F4E) is a joint undertaking of the European Atomic Energy Community (Euratom) that is responsible for the EU's contribution to the International Thermonuclear Experimental Reactor (ITER), the world's largest scientific partne ...
, the Domestic Agency in charge of managing EU contributions to the ITER project *
Helically Symmetric Experiment The Helically Symmetric Experiment (HSX, stylized as Helically Symmetric eXperiment), is an experimental plasma confinement device at the University of Wisconsin–Madison, with design principles that are intended to be incorporated into a fusion ...
, a modular-coil
stellarator A stellarator is a plasma device that relies primarily on external magnets to confine a plasma. Scientists researching magnetic confinement fusion aim to use stellarator devices as a vessel for nuclear fusion reactions. The name refers to the ...
at U Wisconsin-Madison, an alternative design of
fusion reactor Fusion power is a proposed form of power generation that would generate electricity by using heat from nuclear fusion reactions. In a fusion process, two lighter atomic nuclei combine to form a heavier nucleus, while releasing energy. Devices ...
*
International Fusion Materials Irradiation Facility The International Fusion Materials Irradiation Facility, also known as IFMIF, is a projected material testing facility in which candidate materials for the use in an energy producing fusion reactor can be fully qualified. IFMIF will be an acceler ...
, proposed project that is part of the ITER roadmap; construction not yet started * ITER Neutral Beam Test Facility, the facility dedicated to the development of the ITER neutral beam injector prototype *
JT-60 JT-60 (short for Japan Torus-60) is a large research tokamak, the flagship of Japan's magnetic fusion program, previously run by the Japan Atomic Energy Research Institute (JAERI) and currently run by the Japan Atomic Energy Agency's (JAEA) Naka ...
, an
advanced tokamak A tokamak (; russian: токамáк; otk, 𐱃𐰸𐰢𐰴, Toḳamaḳ) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being ...
at
Japan Atomic Energy Agency The is an Independent Administrative Institution formed on October 1, 2005 by a merger of two previous semi-governmental organizations. While it inherited the activities of both JNC and JAERI, it also inherited the nickname of JAERI, "Genken" ...
's Naka Institute; undergoing development of
superconducting Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic flux fields are expelled from the material. Any material exhibiting these properties is a superconductor. Unlike ...
coils *
National Ignition Facility The National Ignition Facility (NIF) is a laser-based inertial confinement fusion (ICF) research device, located at Lawrence Livermore National Laboratory in Livermore, California, United States. NIF's mission is to achieve fusion ignition wit ...
, a
laser A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word "laser" is an acronym for "light amplification by stimulated emission of radiation". The fir ...
-based,
inertial confinement fusion Inertial confinement fusion (ICF) is a fusion energy process that initiates nuclear fusion reactions by compressing and heating targets filled with thermonuclear fuel. In modern machines, the targets are small spherical pellets about the size of ...
(ICF) research device at the Lawrence Livermore Lab in U.S. *
National Spherical Torus Experiment The National Spherical Torus Experiment (NSTX) is a magnetic fusion device based on the ''spherical tokamak'' concept. It was constructed by the Princeton Plasma Physics Laboratory (PPPL) in collaboration with the Oak Ridge National Laboratory, ...
, a
spherical tokamak A spherical tokamak is a type of fusion power device based on the tokamak principle. It is notable for its very narrow profile, or '' aspect ratio''. A traditional tokamak has a toroidal confinement area that gives it an overall shape similar to ...
at
PPPL Princeton Plasma Physics Laboratory (PPPL) is a United States Department of Energy national laboratory for plasma physics and nuclear fusion science. Its primary mission is research into and development of fusion as an energy source. It is known ...
in U.S.; operated 1999-2012 & undergoing upgrade (2022) *
Nuclear Power in France Since the mid 1980s, the largest source of electricity in France is Nuclear power, with a generation of 379.5 TWh in 2019 and a total electricity production of . In 2018, the nuclear share was 71.67%, the highest percentage in the world. Sin ...
, where ≈56 operable fission reactors produced 72% of the nation’s electrical power in 2018 *
PROTO (fusion reactor) PROTO is a proposed nuclear fusion reactor to be implemented after 2050, a successor to the ITER and DEMO projects. It is part of the European Commission The European Commission (EC) is the executive of the European Union (EU). It operates a ...
, the step after DEMO, and the first to produce commercially viable electricity *
Science diplomacy Science diplomacy is the use of scientific collaborations among nations to address common problems and to build constructive international partnerships. Science diplomacy is a form of new diplomacy and has become an umbrella term to describe a n ...
, the use of scientific partnerships among nations to address common problems (e.g., ITER,
ISS The International Space Station (ISS) is the largest modular space station currently in low Earth orbit. It is a multinational collaborative project involving five participating space agencies: NASA (United States), Roscosmos (Russia), JAXA (J ...
&
CERN The European Organization for Nuclear Research, known as CERN (; ; ), is an intergovernmental organization that operates the largest particle physics laboratory in the world. Established in 1954, it is based in a northwestern suburb of Gene ...
) *
Spherical Tokamak for Energy Production Spherical Tokamak for Energy Production (STEP) is a spherical tokamak fusion plant concept proposed by the United Kingdom Atomic Energy Authority and funded by UK government. The project is a proposed DEMO-class successor device to the ITER tokam ...
, a concept of the
UK Atomic Energy Authority The United Kingdom Atomic Energy Authority is a UK government research organisation responsible for the development of fusion energy. It is an executive non-departmental public body of the Department for Business, Energy and Industrial Strategy ...
for an affordable fusion power plant *
Wendelstein 7-X The Wendelstein 7-X (abbreviated W7-X) reactor is an experimental stellarator built in Greifswald, Germany, by the Max Planck Institute for Plasma Physics (IPP), and completed in October 2015.stellarator A stellarator is a plasma device that relies primarily on external magnets to confine a plasma. Scientists researching magnetic confinement fusion aim to use stellarator devices as a vessel for nuclear fusion reactions. The name refers to the ...
of Max Planck IPP in Germany for evaluating components of future fusion power plants


Notes


References


Further reading

Claessens, Michel. (2020). ''ITER: The giant fusion reactor: Bringing a Sun to Earth''. Springer. Clery, Daniel. (2013). ''A Piece of the Sun''. Gerald Duckworth & Co. Ltd. ITER. (2018).
ITER Research Plan within the Staged Approach (Level III – Provisional Version)
'. ITER. Wendell Horton, Jr, C., and Sadruddin Benkadda. (2015). ''ITER physics''. World Scientific.


External links

*
ITER China website

ITER EU (Fusion for Energy) website

ITER India website



ITER Korea website

ITER Russia website

ITER US website

The New Yorker, 3 March 2014, Star in a Bottle, by Raffi Khatchadourian

Archival material
collected by Prof. McCray relating to ITER's early phase (1979–1989) can be consulted at th
Historical Archives of the European Union
in Florence
"ITER Talks (1): Introduction to ITER" video (53:00)
at YouTube, by ITER Organization, July 23, 2021.
The roles of the Host and the non-Host for the ITER Project. June 2005
The broader approach agreement with Japan.
Fusion Electricity – A roadmap to the realisation of fusion energy
EFDA 2012 – 8 missions, ITER, project plan with dependencies, ... {{Authority control Buildings and structures in Bouches-du-Rhône International science experiments Science diplomacy