Title :
Tuning shims for high field quality in superconducting magnets
Author :
Gupta, R. ; Anerella, M. ; Cozzolino, J. ; Erickson, B. ; Greene, A. ; Jain, A. ; Kahn, S. ; Kelly, E. ; Morgan, G. ; Thompson, P. ; Wanderer, P. ; Willen, E.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
fDate :
7/1/1996 12:00:00 AM
Abstract :
A high field quality in quadrupoles for the interaction region is crucial to the luminosity performance of high energy colliders such as the Relativistic Heavy Ion Collider (RHIC). The field quality in magnets is limited in part by manufacturing tolerances in the parts and assembly. A tuning shim method has been developed to reduce the relative field errors (ΔB/B) from ~10-4 to ~10-5 at 2/3 of the coil radius. Eight tuning shims having a variable thickness of iron are inserted after the construction and measurement of field harmonics in the magnet. In this paper the tuning shim technique is described for RHIC interaction region quadrupoles. The results of calculations and measurement are also presented
Keywords :
accelerator magnets; colliding beam accelerators; ion accelerators; particle beam diagnostics; storage rings; superconducting magnets; synchrotrons; Fe; RHIC; Relativistic Heavy Ion Collider; field harmonics measurement; high energy colliders; high field quality; interaction region; luminosity performance; manufacturing tolerances; quadrupoles; relative field errors; superconducting magnets; tuning shims; Apertures; Assembly; Coils; Iron; Laboratories; Magnetic field measurement; Strips; Structural beams; Superconducting magnets; Thickness measurement;
Journal_Title :
Magnetics, IEEE Transactions on
