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Introduction


We are building detectors for the CMS experiment (CMS stands for Compact Muon Solenoid) at the future Large-Hadron-Collider (LHC) at the European Particle Physics Laboratory CERN. CMS is one of the two multipurpose experiments presently under construction.

Like in all collider experiments, the CMS detector is arranged - like onion shells - concentrically around the beam-pipe where the particles (7 TeV on 7 TeV protons collide). Closest to the interaction point are the high-resolution vertex detector (Silicon pixel) and the tracker (full Silicon tracker in case of CMS) - in green in the picture - followed by the electromagnetic (grey) and hadronic calorimeters (yellow) for identification of electrons and jets.

All these detectors are placed in a 4 T magnetic field to ease the tracking and momentum determination. The muon system is situated most outside since only muons can pass through the large amount of material constituting the inner detectors.

As it can be seen in the picture, the muon detectors are arranged in four concentric layers. Our institute builds the innermost detectors (in darker blue), where the resolution requirement is the highest. In total we will construct 70 chambers in 4 years, install and run them at Cern. The main physics goal of CMS is the observation of the Higgs boson - the last remaining fundamental particle yet to detect - and the discovery of supersymmetry - presently the only theory able to unify the forces. At such unprecedented energies, one expects also new physics nobody has though about so far.

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