Steering the Field Quality in the Production of the Main Quadrupoles of the Large Hadron Collider

Author

Hagen, Per ; Bottura, L. ; Calvi, M. ; Sanfilippo, S. ; Schirm, K. ; Todesco, E. ; Tortschanoff, T. ; Simon, F.

Author_Institution

CERN, Geneva

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

285

Lastpage

288

Abstract

The main issues concerning the field quality in the main quadrupoles of the Large Hadron Collider are presented. We show the trend plots for the focusing strength and multipoles at room temperature covering more than 2/3 of the production. We describe the correction of the coil layout to improve b₆ at injection field level. A non-negligible fraction of the quadrupoles has been manufactured with collars featuring a magnetic permeability somewhat higher than the specified limits. We show plots for this anomaly. Field quality correlations to measurements in operational conditions are discussed. The dependence of field quality on cable manufacturer is analysed

Keywords

accelerator magnets; magnetic permeability; particle beam dynamics; particle beam focusing; storage rings; superconducting magnets; Large Hadron Collider; cable manufacturer; coil layout; field quality; focusing strength; injection field level; large scale superconductivity; magnetic permeability; main quadrupoles; nonnegligible fraction; superconducting magnets; Apertures; Assembly; Large Hadron Collider; Magnetic field measurement; Manufacturing; Production; Superconducting coils; Superconducting magnets; Temperature measurement; Testing; Field quality; LHC; large scale superconductivity; magnets; quadrupole;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2006.871225

Filename

1642845