CERN 
The LHC 
ATLAS 
ALICE 
CMS 
LHCB
CMS
a heavyweight detector to understand the Universe
The CMS experiment, located at Point 5 in Cessy (France), will investigate a wide range of physics. Among other things, it will seek the Higgs boson, extra dimensions and the particles that could constitute dark matter. Although it has the same scientific goals as the ATLAS experiment, the CMS collaboration has chosen different technical solutions and a different magnet system design.
Unlike the other big LHC detectors, which were built underground, CMS was first assembled above ground in 15 sections each weighing up to 2000 tonnes, which were subsequently lowered into the cavern and fitted together.
Over 2800 scientists from 183 institutes in 39 countries are involved in CMS. The detector is located in an underground cavern 53 m long, 26.5 m wide and 24 m high at Point 5 of the LHC accelerator in Cessy, France. CMS weighs 12 500 tonnes, twice the weight of ATLAS, but has only an eighth of its volume, hence the name Compact Muon Solenoid. It contains twice as much iron as the Eiffel Tower.