Review of Field Quality in Accelerator Magnets

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Table of Contents

Review of Field Quality in Accelerator Magnets

Update on Field Quality

Field Quality in Iron Dominated Magnets

Improvements in Iron Dominated Magnets

Improvements in Iron Dominated Magnets (continued) - Comparison at 0.04 T (400G)

Review of Field Quality in SC Magnets

Field Quality in SSC Magnets (Lab built prototype dipoles)

Field Errors in SSC dipoles How off we were from reality?

Measured Current Dependence in BNL-built SSC Magnets

Lessons from SSC Magnet Program

Why were we so wrong in estimating field errors in SSC dipoles?

Three magnets with similar apertures Tevatron, HERA and RHIC

Comparison of Field Quality in three similar aperture magnets

Comparison of Field Quality in Tevatron, HERA and RHIC dipoles

Saturation in RHIC Arc Dipoles

Saturation Control in RHIC Dipoles Variation in |B| in Iron Yoke

Average Field Errors on X-axis

What brought these improvements?

Recap on Field Quality from the Latest Large Scale Production - The RHIC Dipole Production

RHIC 100 mm Aperture Insertion Dipole: The first magnet gets the body harmonics right

Average Field errors ~10-4 up to 80% of the coil radius

Tuning Shims for 10-5 Field Quality at 2/3 of coil radius

The best in field quality with tuning shims A few parts in 10-5 at 2/3 of coil radius

Preliminary Calculations in a Common Coil Design Magnet

Persistent Current-induced Harmonics (may be a problem in Nb3Sn magnets, if done nothing)

Summary and Conclusions

Author: Ramesh Gupta

Email: gupta@bnl.gov

Home Page: http://www.bnl.gov/magnets/Staff/Gupta/

Other information:
VLHC Workshop on Accelerator Physics at Lake Geneva, WI, Feb. 22-25, 1999. 

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