Résumé du preprint DAPNIA-04-750

Status of the construction of the CMS Magnet
A. Herve, B. Blau, Ph. Bredy, D. Campi, P. Cannarsa, B. Cure, Th. Dupont, P. Fabbricatore, S. Farinon, F. Feyzi,Ph. Fazilleau, A. Gaddi, H. Gerwig, M. Greco, J.P. Grillet, V. Kaftanov, F. Kircher, V. Klyukhin, B. Levesy, R. Loveless, G. Maire, R. Musenich, Y. Pabot, A. Payn, G. Perini´c, P. Petiot, F. Rondeaux, H. Rykaczewski, E. Sbrissa, S. Sequeira Tavares, S. Sgobba, R.P. Smith, L. Veillet,G. Waurick
CMS (Compact Muon Solenoid) is a generalpurpose detector designed to run at the highest luminosity at the CERN Large Hadron Collider (LHC). Its distinctive features include a 4 T superconducting solenoid with 6 m diameter by 12.5 m long free bore, enclosed inside a 10 000-ton return yoke. The stored magnetic energy is 2.6 GJ. The magnet is being assembled in a surface hall and will be tested at the beginning of 2005 before being transferred to an experimental hall 90 m below ground level. The design and construction of the magnet is a common project of the CMS Collaboration. The task is organized by a CERN based group with strong technical and contractual participation of CEA Saclay, ETH Zurich, Fermilab, INFN Genova, ITEP Moscow, University of Wisconsin and CERN. The return yoke, 21 m long and 14 m in diameter, is equivalent to a thickness of 1.5 m of saturated iron interleaved with four muon stations. Manufacture of the yoke and vacuum tank is completed and the first sub-detectors have been installed. 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 manufacture of the conductor is completed and winding is in progress for a final assembly in 2004. All ancillaries are delivered or under contract. The magnet project is described, with emphasis on the present status of the fabrication.


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