The Argonne Tandem Linac Accelerator System (ATLAS) is a U.S. Department of Energy scientific user facility at

Argonne National Laboratory Argonne National Laboratory is a science and engineering research United States Department of Energy National Labs, national laboratory operated by University of Chicago, UChicago Argonne LLC for the United States Department of Energy. The facil ...

. ATLAS is the first

superconducting Superconductivity is a set of physical properties observed in certain materials where Electrical resistance and conductance, electrical resistance vanishes and magnetic field, magnetic flux fields are expelled from the material. Any material e ...

linear accelerator A linear particle accelerator (often shortened to linac) is a type of particle accelerator that accelerates charged subatomic particles or ions to a high speed by subjecting them to a series of oscillating electric potentials along a linear beam ...

for

heavy ion High-energy nuclear physics studies the behavior of nuclear matter in energy regimes typical of high-energy physics. The primary focus of this field is the study of heavy-ion collisions, as compared to lighter atoms in other particle accelerato ...

s at energies in the vicinity of the

Coulomb barrier The Coulomb barrier, named after Coulomb's law, which is in turn named after physicist Charles-Augustin de Coulomb, is the energy barrier due to electrostatic interaction that two nuclei need to overcome so they can get close enough to undergo a ...

and is open to scientists from all over the world. The ATLAS accelerator at Argonne should not be confused with the

ATLAS experiment ATLAS is the largest general-purpose particle detector experiment at the Large Hadron Collider (LHC), a particle accelerator at CERN (the European Organization for Nuclear Research) in Switzerland. The experiment is designed to take advantage ...

at 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 ...

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 ...

How ATLAS works

Ions are generated from one of two sources: the 9-MV electrostatic tandem Van de Graaff accelerator or the Positive Ion Injector, a 12-MV low-velocity

linac A linear particle accelerator (often shortened to linac) is a type of particle accelerator that accelerates charged subatomic particles or ions to a high speed by subjecting them to a series of oscillating electric potentials along a linear beam ...

and

electron cyclotron resonance Electron cyclotron resonance (ECR) is a phenomenon observed in plasma physics, condensed matter physics, and accelerator physics. It happens when the frequency of incident radiation coincides with the natural frequency of rotation of electrons in ...

(ECR) ion source. The ions are sent from one of these two into the 20-MV 'booster' linac, then to the 20-MV 'ATLAS' linac section. The ATLAS linac is constructed with seven different superconducting resonator designs, each one creating an electromagnetic wave of a different velocity. The ions in the ATLAS linac are aligned into a beam which exits the linac into one of three experimental areas. The experiment areas contain

scattering Scattering is a term used in physics to describe a wide range of physical processes where moving particles or radiation of some form, such as light or sound, are forced to deviate from a straight trajectory by localized non-uniformities (including ...

chambers, spectrometers and spectrographs,

beamlines In accelerator physics, a beamline refers to the trajectory of the beam of particles, including the overall construction of the path segment (guide tubes, diagnostic devices) along a specific path of an accelerator facility. This part is either ...

, a gamma-ray facility, and

particle detectors In the physical sciences, a particle (or corpuscule in older texts) is a small localized object which can be described by several physical or chemical properties, such as volume, density, or mass. They vary greatly in size or quantity, from su ...

. In 2009, Argonne added a system called CARIBU (Californium Rare Ion Breeder Upgrade) to ATLAS. The system is capable of generating beams of rare isotopes. ATLAS has since received additional upgrades with two enhancements: The Electron Beam Ion System (EBIS), which enables radioactive beams to match the accelerating structures by increasing the ion beam’s positive charge, and the Argonne In-Flight Radioactive Ion Separator (RAISOR), which helps to improve beam purity by separating out specific isotopes. The enhancements of ATLAS with EBIS and RAISOR help scientists probe the structures of exotic elements, study the nature of the nuclear forces, and better understand the production of elements in stars and supernovae.

What ATLAS is for

The energy levels of the ions produced by ATLAS are ideal to study the properties of the

nucleus Nucleus ( : nuclei) is a Latin word for the seed inside a fruit. It most often refers to: *Atomic nucleus, the very dense central region of an atom *Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucle ...

. Specifically, scientists use ATLAS to understand reactions between nuclei from very low energies (typically encountered in burning stars) to the very highest energies (encountered soon after the Big Bang). Nuclei with specific properties can be studied to understand fundamental interactions.

What is ATLAS made of

Niobium Niobium is a chemical element with chemical symbol Nb (formerly columbium, Cb) and atomic number 41. It is a light grey, crystalline, and ductile transition metal. Pure niobium has a Mohs hardness rating similar to pure titanium, and it has sim ...

is the primary metal used to construct the tube

in the individual in-line resonators. Niobium is used because it is relatively cheap, yet it is a Superconducting, superconductor at relatively high temperatures. Niobium has poor malleability, which makes it difficult to construct the shapes needed for the resonators. The machinists working at ATLAS are some of the only people in the world able to work with niobium to the degree necessary for construction and repair of the ATLAS parts.

Target areas

Atom Trap at ATLAS Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and a number of neutrons. Only the most common variety of hydrogen has no neutrons. Every solid, liquid, gas, an ...

Canadian Penning Trap Mass Spectrometer The Canadian Penning Trap Mass Spectrometer (CPT) is one of the major pieces of experimental equipment that is installed on the ATLAS superconducting heavy-ion linac facility at the Physics Division of the Argonne National Laboratory. It was develo ...

Enge Split Pole Spectrograph Enge may refer to: * Enge (surname) * Enge (EP) *Enge (Zürich), a quarter of the city of Zürich, Switzerland * Enge, Estonia, village in Halinga Parish, Pärnu County, Estonia * Enge River, river in Estonia Estonia, formally the Republic ...

Fragment Mass Analyzer Fragment may refer to: Entertainment Television and film * "Fragments" (''Torchwood''), an episode from the BBC TV series * "Fragments", an episode from the Canadian TV series ''Sanctuary'' * "Fragments" (Steven Universe Future), an episode f ...

Gammasphere The Gammasphere is a third generation gamma ray spectrometer used to study rare and exotic nuclear physics. It consists of 110 Compton-suppressed large volume, high-purity germanium detectors arranged in a spherical shell. Gammasphere has been us ...

Helical Orbit Spectrometer (HELIOS) The helical orbit spectrometer (HELIOS) is a measurement device for studying nuclear reactions in inverse kinematics. It is installed at the ATLAS facility at Argonne National Laboratory. History The HELIOS concept was first proposed at the ''Wo ...

Large Scattering Chamber Large means of great size. Large may also refer to: Mathematics * Arbitrarily large, a phrase in mathematics * Large cardinal, a property of certain transfinite numbers * Large category, a category with a proper class of objects and morphisms ( ...

References

* * {{authority control Argonne National Laboratory Nuclear research institutes Particle physics facilities

How ATLAS works

What ATLAS is for

What is ATLAS made of

Target areas

See also

References