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

Author

Baze, J.M. ; Berriaud, C. ; Curé, C. ; Daël, A. ; Desportes, H. ; Duthil, R. ; Gallet, B. ; Juster, F.P. ; Lesmond, C. ; Mayri, C. ; Pabot, Y.

Author_Institution

Service Tech. de Cryogenie et de Magnetisme, CEA, Centre d´´Etudes Nucleaires de Saclay, Gif-sur-Yvette, France

Volume

32

Issue

4

fYear

1996

fDate

7/1/1996 12:00:00 AM

Firstpage

2047

Lastpage

2050

Abstract

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

Keywords

accelerator magnets; colliding beam accelerators; cryogenics; cryostats; particle beam diagnostics; position sensitive particle detectors; proton accelerators; semiconductor counters; storage rings; superconducting magnets; synchrotrons; 19.5 m; 26 m; 3 MA; 5.6 m; ATLAS detector; Al; LHC; Large Hadron Collider; air core superconducting toroids; barrel toroid; central region; cryogenics principles; cryostat; electromagnetic design; end cap toroids; fault sensing; forces calculation; indirectly cooled conductor; mechanical structure; monolithic fully impregnated winding; quench protection; superconducting toroidal magnet; thermal analysis; transparency; unsymmetric loadings; Aluminum; Assembly; Boring; Coils; Conductors; Electromagnetic fields; Electromagnetic forces; Magnetic cores; Superconducting magnets; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.508564

Filename

508564