RHIC IR Quadrupoles and Field Quality State of the Art in Super Conducting Accelerator Magnets
The interaction region (IR) quadrupoles [1] for the Relativistic Heavy Ion Collider (RHIC)[2]are the best field quality superconducting magnets ever built for any major accelerator. This field quality is primarily achieved with the help of eight tuning shims [3] that remove the residual errors from a magnet after it is built and tested. These shims overcome the limitations from the typical tolerances in parts and manufacturing. This paper describes the tuning shims and discusses the evolution of a flexible approach that allowed changes in the design parameters and facilitated using parts with significant dimensional variations while controlling cost and maintaining schedule and field quality. The RHIC magnet program also discovered that quench and thermal cycles cause small changes [4]in magnet geometry. The ultimate field quality performance is now understood to be determined by these changes rather than the manufacturing tolerances or the measurement errors.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Accelerator& Fusion Research Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 1011421
- Report Number(s):
- LBNL-42519; TRN: US201109%%354
- Resource Relation:
- Conference: 1999 Particle Accelerator Conference, New York, New York, March 29-April 2, 1999
- Country of Publication:
- United States
- Language:
- English
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TUNING SHIMS FOR HIGH FIELD QUALITY IN SUPERCONDUCTING MAGNETS.
Tuning shims for high field quality in superconducting magnets