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Progress in the design of a superconducting toroidal magnet for the ATLAS detector on LHC

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11 Author(s)
Baze, J.M. ; Service Tech. de Cryogenie et de Magnetisme, CEA, Centre d''Etudes Nucleaires de Saclay, Gif-sur-Yvette, France ; Berriaud, C. ; Cure, C. ; Dael, A.
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The toroidal system consists of three air core superconducting toroids. The barrel toroid covers the central region over a length of 26 m with an inner bore of 9.4 m and an outer diameter of 19.5 m. The two end cap toroids are inserted in the barrel at each end over a length of 5.6 m with an inner bore of 1.26 m. Each toroid consists of eight fiat coils assembled around the beam axis and carrying 3 MAt each. The present paper describes the barrel toroid. Features of the design which are presented include the electromagnetic design, field and forces calculations, the basic concept of indirectly cooled aluminium conductor and monolithic fully impregnated winding, the description of the alu-alloy mechanical structure, the thermal analysis and the quench protection. Cryogenics principles, cryostat and toroid assembly procedures are summarized. Unsymmetric loadings, fault sensing and stability are discussed, in relation with the requirements of transparency

Published in:

Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 4 )

Date of Publication:

Jul 1996

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