CMS coil thermal shields final design

Author

Fazilleau, Ph ; Bredy, Ph ; Levesy, B.

Author_Institution

DSM/DAPNIA/STCM, CEA, Centre d´´Etudes Nucleaires de Saclay, Gif-sur-Yvette, France

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

362

Lastpage

365

Abstract

The Compact Muon Solenoid (CMS) is one of the detectors that is under construction in the framework of the Large Hadron Collider (LHC) project at CERN. The design field of the CMS magnet is 4 T in a 6 m diameter and 12.5 m long bore leading to a stored energy of 2.7 GJ. The coil cryogenic system is designed to cool the thermal shields by helium gas at 60 K and protect the cold mass at 4.5 K from the thermal radiation. The thermal shield design must take into account cryogenics, eddy currents, mechanical and realization considerations. This paper presents a detailed analysis of the eddy currents induced in the thermal shield, using a variational formulation of the problem in terms of the electric vector potential and a finite element method. The thermal and mechanical design are then described.

Keywords

eddy currents; finite element analysis; particle detectors; superconducting magnets; 2.7 GJ; 4 T; 4.5 K; 60 K; CMS coil thermal shields final design; Compact Muon Solenoid; He; Large Hadron Collider; coil cryogenic system; eddy currents; electric vector potential; finite element method; thermal radiation; thermal shield design; variational formulation; Boring; Coils; Collision mitigation; Cryogenics; Detectors; Eddy currents; Large Hadron Collider; Magnetic shielding; Mesons; Solenoids;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018420

Filename

1018420