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Description
CMS (Compact Muon Solenoid) is a general-purpose detector designed to run at the highest luminosity at the LHC. Its distinctive features include a 6 m free bore diameter, 12.5 m long, 4 T superconducting solenoid enclosed inside a 10,000 tons return yoke. The magnet will be assembled and tested on the surface at Point 5 (Cessy) at the beginning of 2004 before being transferred by heavy lifting means to a 90 m deep underground experimental area.
The design and construction of the magnet is a common project of the CMS Collaboration. It is organized by a CERN based group with strong technical and contractual participation by CEA Saclay, ETH Zuerich, Fermilab Batavia IL, INFN Genova, ITEP Moscow, University of Wisconsin and CERN.
The return yoke, 21 m long and 14 m in diameter, is equivalent to 1.5 m of saturated iron interleaved with four muon stations. Manufacture of the yoke and vacuum tank is nearly completed and assembly has started in the surface hall.
The indirectly-cooled, pure aluminium-stabilized coil is made up from five modules internally wound with four layers of a 20 kA mechanically reinforced conductor. The contracts for the conductor, the winding and the outer cryogenics have been awarded.
The project will be described, with emphasis on the present status.