The Info List - CERN

The European Organization for Nuclear Research (French: Organisation européenne pour la recherche nucléaire), known as CERN (/sɜːrn/; French pronunciation: ​[sɛʁn]; derived from the name Conseil Européen pour la Recherche Nucléaire), is a European research organization that operates the largest particle physics laboratory in the world. Established in 1954, the organization is based in a northwest suburb of Geneva on the Franco–Swiss border, (46°14′3″N 6°3′19″E / 46.23417°N 6.05528°E / 46.23417; 6.05528) and has 22 member states.[3] Israel is the only non-European country granted full membership.[4] CERN is an official United Nations Observer.[5]

The acronym CERN is also used to refer to the laboratory, which in 2016 had 2,500 scientific, technical, and administrative staff members, and hosted about 12,000 users. In the same year, CERN generated 49 petabytes of data.[6]

CERN's main function is to provide the particle accelerators and other infrastructure needed for high-energy physics research – as a result, numerous experiments have been constructed at CERN through international collaborations. The main site at Meyrin hosts a large computing facility, which is primarily used to store and analyse data from experiments, as well as simulate events. Researchers need remote access to these facilities, so the lab has historically been a major wide area network hub. CERN is also the birthplace of the World Wide Web.[7][8]


The 12 founding member states of CERN in 1954[1] (map borders from 1954–1990)

The convention establishing CERN was ratified on 29 September 1954 by 12 countries in Western Europe.[1] The acronym CERN originally represented the French words for Conseil Européen pour la Recherche Nucléaire (European Council for Nuclear Research), which was a provisional council for building the laboratory, established by 12 European governments in 1952. The acronym was retained for the new laboratory after the provisional council was dissolved, even though the name changed to the current Organisation Européenne pour la Recherche Nucléaire (European Organization for Nuclear Research) in 1954.[9] According to Lew Kowarski, a former director of CERN, when the name was changed, the abbreviation could have become the awkward OERN, and Heisenberg said that this could "still be CERN even if the name is [not]". Template Template-Fact" style="white-space:nowrap;">[citation needed]

CERN's first president was Sir Benjamin Lockspeiser. Edoardo Amaldi was the general secretary of CERN at its early stages when operations were still provisional, while the first Director-General (1954) was Felix Bloch.[10]

The laboratory was originally devoted to the study of atomic nuclei, but was soon applied to higher-energy physics, concerned mainly with the study of interactions between subatomic particles. Therefore, the laboratory operated by CERN is commonly referred to as the European laboratory for particle physics (Laboratoire européen pour la physique des particules), which better describes the research being performed there.

Scientific achievements

Several important achievements in particle physics have been made through experiments at CERN. They include:

In September 2011, CERN attracted media attention when the OPERA Collaboration reported the detection of possibly faster-than-light neutrinos.[18] Further tests showed that the results were flawed due to an incorrectly connected GPS synchronization cable.[19]

The 1984 Nobel Prize for Physics was awarded to Carlo Rubbia and Simon van der Meer for the developments that resulted in the discoveries of the W and Z bosons. The 1992 Nobel Prize for Physics was awarded to CERN staff researcher Georges Charpak "for his invention and development of particle detectors, in particular the multiwire proportional chamber". The 2013 Nobel Prize for physics was awarded to François Englert and Peter Higgs for the theoretical description of the Higgs mechanism in the year after the Higgs boson was found by CERN experiments.

Computer science

This NeXT Computer used by British scientist Sir Tim Berners-Lee at CERN became the first Web server.
This Cisco Systems router at CERN was one of the first IP routers deployed in Europe.
A plaque at CERN commemorating the invention of the World Wide Web by Tim Berners-Lee and Robert Cailliau

The World Wide Web began as a CERN project named ENQUIRE, initiated by Tim Berners-Lee in 1989 and Robert Cailliau in 1990.[20] Berners-Lee and Cailliau were jointly honoured by the Association for Computing Machinery in 1995 for their contributions to the development of the World Wide Web.

Based on the concept of hypertext, the project was intended to facilitate the sharing of information between researchers. The first website was activated in 1991. On 30 April 1993, CERN announced that the World Wide Web would be free to anyone. A copy[21] of the original first webpage, created by Berners-Lee, is still published on the World Wide Web Consortium"> World Wide Web Consortium's website as a historical document.

Prior to the Web's development, CERN had pioneered the introduction of Internet technology, beginning in the early 1980s.[22]

More recently, CERN has become a facility for the development of grid computing, hosting projects including the Enabling Grids for E-sciencE (EGEE) and LHC Computing Grid. It also hosts the CERN Internet Exchange Point"> CERN Internet Exchange Point (CIXP), one of the two main internet exchange points in Switzerland.

Particle accelerators

Current complex

Map of the CERN accelerator complex
Map of the Large Hadron Collider together with the Proton Synchrotron">Super Proton Synchrotron at CERN

CERN operates a network of six accelerators and a decelerator. Each machine in the chain increases the energy of particle beams before delivering them to experiments or to the next more powerful accelerator. Currently active machines are:

Large Hadron Collider

Many activities at CERN currently involve operating the Large Hadron Collider (LHC) and the experiments for it. The LHC represents a large-scale, worldwide scientific cooperation project.

Construction of the CMS detector for LHC at CERN

The LHC tunnel is located 100 metres underground, in the region between the Geneva International Airport"> Geneva International Airport and the nearby Jura mountains. The majority of its length is on the French side of the border. It uses the 27 km circumference circular tunnel previously occupied by the Positron Collider">Large Electron– Positron Collider (LEP), which was shut down in November 2000. CERN's existing PS/SPS accelerator complexes are used to pre-accelerate protons and lead ions which are then injected into the LHC.

Seven experiments (CMS, ATLAS, LHCb, MoEDAL,[24] TOTEM, LHC-forward and Collider Experiment">ALICE) are located along the collider; each of them studies particle collisions from a different aspect, and with different technologies. Construction for these experiments required an extraordinary engineering effort. For example, a special crane was rented from Belgium to lower pieces of the CMS detector into its underground cavern, since each piece weighed nearly 2,000 tons. The first of the approximately 5,000 magnets necessary for construction was lowered down a special shaft at 13:00 GMT on 7 March 2005.

The LHC has begun to generate vast quantities of data, which CERN streams to laboratories around the world for distributed processing (making use of a specialized grid infrastructure, the LHC Computing Grid). During April 2005, a trial successfully streamed 600 MB/s to seven different sites across the world.

The initial particle beams were injected into the LHC August 2008.[25] The first beam was circulated through the entire LHC on 10 September 2008,[26] but the system failed 10 days later because of a faulty magnet connection, and it was stopped for repairs on 19 September 2008.

The LHC resumed operation on 20 November 2009 by successfully circulating two beams, each with an energy of 3.5 teraelectronvolts (TeV). The challenge for the engineers was then to try to line up the two beams so that they smashed into each other. This is like "firing two needles across the Atlantic and getting them to hit each other" according to Steve Myers, director for accelerators and technology.

On 30 March 2010, the LHC successfully collided two proton beams with 3.5 TeV of energy per proton, resulting in a 7 TeV collision energy. However, this was just the start of what was needed for the expected discovery of the Higgs boson. When the 7 TeV experimental period ended, the LHC revved to 8 TeV (4 TeV per proton) starting March 2012, and soon began particle collisions at that energy. In July 2012, CERN scientists announced the discovery of a new sub-atomic particle that was later confirmed to be the Higgs boson.[27] In March 2013, CERN announced that the measurements performed on the newly found particle allowed it to conclude that this is a Higgs boson.[28] In early 2013, the LHC was deactivated for a two-year maintenance period, to strengthen the electrical connections between magnets inside the accelerator and for other upgrades.

On 5 April 2015, after two years of maintenance and consolidation, the LHC restarted for a second run. The first ramp to the record-breaking energy of 6.5 TeV was performed on 10 April 2015.[29][30] In 2016, the design collision rate was exceeded for the first time.[31] A second two-year period of shutdown is scheduled to begin at the end of 2018.

Decommissioned accelerators

Possible future accelerators

CERN, in collaboration with groups worldwide, is investigating two main concepts for future accelerators: A linear electron-positron collider with a new acceleration concept to increase the energy (CLIC) and a larger version of the LHC, a project currently named Future Circular Collider.


Interior of office building 40 at the Meyrin site. Building 40 hosts many offices for scientists from the CMS and ATLAS collaborations.

The smaller accelerators are on the main Meyrin site (also known as the West Area), which was originally built in Switzerland alongside the French border, but has been extended to span the border since 1965. The French side is under Swiss jurisdiction and there is no obvious border within the site, apart from a line of marker stones. There are six entrances to the Meyrin site: Template Template-Fact" style="white-space:nowrap;">[citation needed]

  • A, in Switzerland, for all CERN personnel at specific times.
  • B, in Switzerland, for all CERN personnel at all times. Often referred to as the main entrance.
  • C, in Switzerland, for all CERN personnel at specific times.
  • D, in Switzerland, for goods reception at specific times.
  • E, in France, for French-resident CERN personnel at specific times. Named "Porte Charles de Gaulle" in recognition of his role in the creation of CERN.[32]
  • Inter-site tunnel, in France, for equipment transfer to and from CERN sites in France by personnel with a specific permit. This is the only permitted route for such transfers. By the CERN treaty, no taxes are payable when such transfers are made. Controlled by customs personnel.[28][33]
CERN's main site, from Switzerland looking towards France

The SPS and LEP/LHC tunnels are almost entirely outside the main site, and are mostly buried under French farmland and invisible from the surface. However, they have surface sites at various points around them, either as the location of buildings associated with experiments or other facilities needed to operate the colliders such as cryogenic plants and access shafts. The experiments are located at the same underground level as the tunnels at these sites.

Three of these experimental sites are in France, with ATLAS in Switzerland, although some of the ancillary cryogenic and access sites are in Switzerland. The largest of the experimental sites is the Prévessin site, also known as the North Area, which is the target station for non-collider experiments on the SPS accelerator. Other sites are the ones which were used for the UA1, UA2 and the LEP experiments (the latter are used by LHC experiments).

Outside of the LEP and LHC experiments, most are officially named and numbered after the site where they were located. For example, NA32 was an experiment looking at the production of so-called "charmed" particles and located at the Prévessin (North Area) site while WA22 used the Big European Bubble Chamber (BEBC) at the Meyrin (West Area) site to examine neutrino interactions. The UA1 and UA2 experiments were considered to be in the Underground Area, i.e. situated underground at sites on the SPS accelerator.

Most of the roads on the CERN Meyrin and Prévessin sites are named after famous physicists, such as Richard Feynman, Niels Bohr, and Albert Einstein.

Participation and funding

Member states and budget

Since its foundation by 12 members in 1954, CERN regularly accepted new members. All new members have remained in the organization continuously since their accession, except Spain and Yugoslavia. Spain first joined CERN in 1961, withdrew in 1969, and rejoined in 1983. Yugoslavia was a founding member of CERN but quit in 1961. Of the 22 members, Israel joined CERN as a full member on 6 January 2014,[34] becoming the first (and currently only) non-European full member.[35]

The budget contributions of member states are computed based on their GDP.[36]

Member state Status since Contribution
(million CHF for 2017)
(fraction of total for 2017)
Contribution per capita[note 1]
(CHF/person for 2017)
Founding Members[note 2]
 Belgium 29 September 1954 30.9 2.76% 2.7
 Denmark 29 September 1954 19.8 1.7% 3.4
 France 29 September 1954 160.3 14.3% 2.6
 Germany 29 September 1954 228.9 20.4% 2.8
 Greece 29 September 1954 13.4 1.2% 1.6
 Italy 29 September 1954 118.9 10.6% 2.1
 Netherlands 29 September 1954 53.4 4.7% 3.0
 Norway 29 September 1954 32.4 2.8% 5.4
 Sweden 29 September 1954 30.6 2.7% 3.0
  Switzerland 29 September 1954 43.8 3.9% 4.9
 United Kingdom 29 September 1954 169.0 15.0% 2.4
 Yugoslavia[note 3] 29 September 1954[39][40] 0 0% 0
Acceded Members[note 4]
 Austria 1 June 1959 24.2 2.1% 2.9
 Spain[note 5] 1 January 1983[40][42] 80.8 7.2% 2.0
 Portugal 1 January 1986 12.4 1.1% 1.3
 Finland 1 January 1991 15.0 1.3% 2.8
 Poland 1 July 1991 31.6 2.8% 0.8
 Hungary 1 July 1992 6.7 0.6% 0.7
 Czech Republic 1 July 1993 10.5 0.9% 1.1
 Slovakia 1 July 1993 5.4 0.5% 1.0
 Bulgaria 11 June 1999 3.3 0.3% 0.4
 Israel 6 January 2014[34] 16.7 1.5% 2.7
 Romania 17 July 2016[43] 11.1 1.0% N/A
Associate Member in the pre-stage to Membership[note 6]
 Serbia 15 March 2012[44] 1.9 0.1% 0.1
 Cyprus 1 April 2016[45] 1.0 %
 Slovenia 4 July 2017[46][47] 0.5 %
Associate Members
 Turkey 6 May 2015[48] 4.7 %
 Pakistan 31 July 2015[49] 1.4 %
 Ukraine 5 Oct 2016[50] 1.0 %
 India 16 Jan 2017[51] 11.6 %
 Lithuania 8 Jan 2018[52] %
zaTotal Members, Candidates and Associates 1,142.1[36] 99.4%
  1. ^ Based on the population in 2017.
  2. ^ 12 founding members drafted the Convention for the Establishment of a European Organization for Nuclear Research which entered into force on 29 September 1954.[37][38]
  3. ^ Yugoslavia left the organization in 1961.
  4. ^ Acceded members become CERN member states by ratifying the CERN convention.[41]
  5. ^ Spain was previously a member state from 1961 to 1969
  6. ^ Additional contribution from Candidates for Accession and Associate Member States.[41]


Associate Members, Candidates:

  •   Serbia became a candidate for accession to CERN on 19 December 2011, signed an association agreement on 10 January 2012[53][54] and became an associate member in the pre-stage to membership on 15 March 2012.[44]
  •   Turkey signed an association agreement on 12 May 2014[55] and became an associate member on 6 May 2015.
  •   Pakistan signed an association agreement on 19 December 2014[56] and became an associate member on 31 July 2015.[57][58]
  •   Cyprus signed an association agreement on 5 October 2012 and became an associate Member in the pre-stage to membership on 1 April 2016.[45]
  •   Ukraine signed an association agreement on 3 October 2013. The agreement was ratified on 5 October 2016.[50]
  •   India signed an association agreement on 21 November 2016.[59] The agreement was ratified on 16 January 2017.[51]
  •   Slovenia was approved for admission as an Associate Member state in the pre-stage to membership on 16 December 2016.[46] The agreement was ratified on 4 July 2017.[47]
  •   Lithuania was approved for admission as an Associate Member state on 16 June 2017. The association agreement was signed on 27 June 2017 and ratified on 8 January 2018.[60][52]

International relations

Three countries have observer status:[61]

  •  Japan – since 1995
  •  Russia – since 1993
  •  United States – since 1997

Also observers are the following international organizations:

Non-Member States (with dates of Co-operation Agreements) currently involved in CERN programmes are:[62]

  •  Albania
  •  Algeria
  •  Argentina – 11 March 1992
  •  Armenia – 25 March 1994
  •  Australia – 1 November 1991
  •  Azerbaijan – 3 December 1997
  •  Bangladesh
  •  Belarus – 28 June 1994
  •  Bolivia
  •  Brazil – 19 February 1990 & October 2006
  •  Canada – 11 October 1996
  •  Chile – 10 October 1991
  •  China – 12 July 1991, 14 August 1997 & 17 February 2004
  •  Colombia – 15 May 1993
  •  Croatia – 18 July 1991
  •  Ecuador
  •  Egypt – 16 January 2006
  •  Estonia – 23 April 1996
  •  Georgia – 11 October 1996
  •  Iceland – 11 September 1996
  •  Iran – 5 July 2001
  •  Jordan - 12 June 2003.[63] MoU with Jordan and SESAME, in preparation of a cooperation agreement signed in 2004.[64]
  •   Lithuania – 9 November 2004
  •  Macedonia – 27 April 2009
  •  Malta – 10 January 2008[65][66]
  •  Mexico – 20 February 1998
  •  Mongolia
  •  Montenegro – 12 October 1990
  •  Morocco – 14 April 1997
  •  New Zealand – 4 December 2003
  •  Peru – 23 February 1993
  •  Saudi Arabia – 21 January 2006
  •  South Africa – 4 July 1992
  •  South Korea – 25 October 2006
  •  United Arab Emirates – 18 January 2006
  •  Vietnam

CERN also has scientific contacts with the following countries:[62]

  •  Cuba
  •  Ghana
  •  Ireland
  •  Latvia
  •  Lebanon
  •  Madagascar
  •  Malaysia
  •  Mozambique
  •  Palestine
  •  Philippines
  •  Qatar
  •  Rwanda
  •  Singapore
  •  Sri Lanka
  •  Taiwan
  •  Thailand
  •  Tunisia
  •  Uzbekistan

International research institutions, such as CERN, can aid in science diplomacy.[67]

Associated institutions

ESO and CERN have a cooperation agreement.[68]

Open access publishing

CERN has initiated an open access publishing project to convert scientific articles in high energy physics into gold open access by redirecting subscription fees. In the first phase from 2014-2016 3,000 libraries, consortia, research organisations, publishers and funding agencies in various countries participated.[69] All publications by CERN authors are published with gold open access.[70]

Public exhibits

Facilities at CERN open to the public include:

CERN also provides daily tours to certain facilities such as the Synchro-cyclotron (CERNs first particle accelerator) and the superconducting magnet workshop.

In popular culture

Line 18 goes to CERN
The statue of Shiva engaging in the Nataraja dance presented by the Department of Atomic Energy of India.

See also


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External links