page_title: Compact Muon Solenoid
section_title: Detector summary
hierarchical_section_title: Compact Muon Solenoid / Detector summary
caption_attribution_description: English: Cutaway diagram of the CMS detector after the Phase 1 Pixel upgrade. The 3D models of the CMS detector were created in SketchUp via its Ruby API. The detector geometries were obtained from the CMS Detector Description stored in CMSSW packages.
context_page_description: The Compact Muon Solenoid experiment is one of two large general-purpose particle physics detectors built on the Large Hadron Collider at CERN in Switzerland and France. The goal of CMS experiment is to investigate a wide range of physics, including the search for the Higgs boson, extra dimensions, and particles that could make up dark matter.
  CMS is 21 metres long, 15 m in diameter, and weighs about 14,000 tonnes. Over 4,000 people, representing 206 scientific institutes and 47 countries, form the CMS collaboration who built and now operate the detector. It is located in a cavern at Cessy in France, just across the border from Geneva. In July 2012, along with ATLAS, CMS tentatively discovered the Higgs boson.
  By March 2013 its existence was confirmed.
context_section_description: CMS is designed as a general-purpose detector, capable of studying many aspects of proton collisions at 0.9–13 TeV, the center-of-mass energy of the LHC particle accelerator.
  The CMS detector is built around a huge solenoid magnet. This takes the form of a cylindrical coil of superconducting cable that generates a magnetic field of 4 tesla, about 100 000 times that of the Earth. The magnetic field is confined by a steel 'yoke' that forms the bulk of the detector's weight of 12 500 t. An unusual feature of the CMS detector is that instead of being built in-situ underground, like the other giant detectors of the LHC experiments, it was constructed on the surface, before being lowered underground in 15 sections and reassembled.
  It contains subsystems which are designed to measure the energy and momentum of photons, electrons, muons, and other products of the collisions.  The innermost layer is a silicon-based tracker.  Surrounding it is a scintillating crystal electromagnetic calorimeter, which is itself surrounded with a sampling calorimeter for hadrons.  The tracker and the calorimetry are compact enough to fit inside the CMS Solenoid which generates a powerful magnetic field of 3.8 T.  Outside the magnet are the large muon detectors, which are inside the return yoke of the magnet.
caption: A cutaway diagram of the CMS detector
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