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ATLAS in France


ATLAS (A Toroid Lhc ApparatuS) is one of the two non specialized experiments on the LHC.
The LHC, located near Geneva on the french-swiss border, is the most powerful proton-proton collider ever build, with centre of mass energies between 7 TeV and 14 TeV.
This huge detector (it is 20 m high) is installed about 100 meters below the ground, at the "point 1" of the LHC.
It was designed and is now used by a collaboration of more than 2500 scientists from 35 countries.

The LPSC was involved in the building of the pre-sampler of the electromagnetic calorimeter (used to detect photons, electrons and jets) and in the cryogenic system of the whole liquid argon calorimeter (which comprises a hadronic part and a very forward part in addition to the electromagnetic part).
The LPSC was also involved in the setting up of the computing grid (LCG) providing the computing power needed to analyse the data produced by the collisions.
Currently, the group is studying the following physics topics: top quark production, top quark polarization, supersymmetric particles (dark matter) search and new neutral bosons with spin 1 (Z', gKK) or spin 2 (G*).

 Schematic diagram of the ATLAS detector© CERN