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ATLAS experiment
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===Particle accelerator growth=== [[File:CERN Atlas Caverne.jpg|thumb|ATLAS detector under construction in October 2004 in the experiment pit. Construction was completed in 2008 and ATLAS has been successfully collecting data since November 2009, when colliding beam operation at the LHC started. Note the people in the background, for size comparison.]] The first [[cyclotron]], an early type of particle accelerator, was built by [[Ernest O. Lawrence]] in 1931, with a radius of just a few centimetres and a particle [[energy]] of 1 [[electron volt#MeV|megaelectronvolt (MeV)]]. Since then, accelerators have grown enormously in the quest to produce new particles of greater and greater [[mass]]. As accelerators have grown, so too has the [[list of particles|list of known particles]] that they might be used to investigate.
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