Additional countries, universities, and laboratories have joined in subsequent years. The ATLAS experiment was proposed in its current form in 1994, and officially funded by the CERN member countries in 1995. The design was a combination of two previous projects for LHC, EAGLE and ASCOT, and also benefitted from the detector research and development that had been done for the Superconducting Super Collider, a US project interrupted in 1993. At present, the ATLAS Collaboration involves 5,767 members, out of which 2,646 are physicists (last census: September 9, 2021) from 180 institutions in 40 countries. The ATLAS Collaboration, the international group of physicists belonging to different universities and research centres who built and run the detector, was formed in 1992 when the proposed EAGLE (Experiment for Accurate Gamma, Lepton and Energy Measurements) and ASCOT (Apparatus with Super Conducting Toroids) collaborations merged their efforts to build a single, general-purpose particle detector for a new particle accelerator, the Large Hadron Collider. As accelerators have grown, so too has the list of known particles that they might be used to investigate. Since then, accelerators have grown enormously in the quest to produce new particles of greater and greater mass. Lawrence in 1931, with a radius of just a few centimetres and a particle energy of 1 megaelectronvolt (MeV).

The first cyclotron, an early type of particle accelerator, was built by Ernest O. Note the people in the background, for size comparison. Construction was completed in 2008 and ATLAS has been successfully collecting data since November 2009, when colliding beam operation at the LHC started. History Particle accelerator growth ATLAS detector under construction in October 2004 in the experiment pit. The experiment is a collaboration involving 6,003 members, out of which 3,822 are physicists (last update: June 26, 2022) from 257 institutions in 42 countries. It was also designed to search for evidence of theories of particle physics beyond the Standard Model. ATLAS was one of the two LHC experiments involved in the discovery of the Higgs boson in July 2012. The experiment is designed to take advantage of the unprecedented energy available at the LHC and observe phenomena that involve highly massive particles which were not observable using earlier lower- energy accelerators.

Linear accelerators for protons (Linac 4) and lead (Linac 3)Ĥ6☁4′8″N 6☃′19″E / 46.23556°N 6.05528☎ / 46.23556 6.05528 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. Total Cross Section, Elastic Scattering and Diffraction Dissociation Plan of the LHC experiments and the preaccelerators.

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