Field Quality Aspects of the Different Magnet Designs

05/12/2000

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Table of Contents

Field Quality Aspects of the Different Magnet Designs

Update on Field Quality

Major Sources of Field Errors

Field Quality in Iron Dominated Magnets

Review of Field Quality in SC Magnets

Comparison of Field Quality in three similar aperture magnets

Saturation in RHIC Arc Dipoles

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

Field Quality in SSC Magnets (Lab built prototype dipoles)

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

What brought these improvements?

What brought these improvements? (continued)

RELEVANCE TO VLHC MAGNETS 

Now the Details Three magnets with similar apertures

Comparison of Field Quality in Tevatron, HERA and RHIC dipoles

Approach for Reducing Saturation-induced Harmonics in RHIC Arc Dipoles

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

Saturation Control in RHIC Dipoles Variation in (m-1)/(m+1) in Iron Yoke

Current Dependence Beyond Design Field

Average Field Errors on X-axis

Geometric Errors

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

On to a New Magnet

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

What happens in a typical first magnet?

What was done in RHIC Insertion dipoles?

The RHIC IR Quadrupoles (The best field quality magnets ever built)

Saturation control in RHIC IR Quad

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

Ultimate Field Quality in SC Magnets

Lessons from SSC Magnet Program

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

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

Improvements in Iron Dominated Magnets

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

Texas A&M Block Dipole (McIntyre) (Current Programming to control saturation)

Preliminary Calculations in a Common Coil Design Magnet

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

Acknowledgements

Summary and Conclusions

Author: Ramesh Gupta

Email: gupta@bnl.gov

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

Other information:
Talk #2 at Port Jefforson, NY Workshop on Magnet Technologies for VLHC on Nov 16-18, 1998. The talk #1 was: "Common Coil Magnet System (with a Large Dynamic Range)".

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