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Title: Mitigation of persistent current effects in the RHIC superconducting magnets

Journal Article · · Physical Review Accelerators and Beams
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Persistent currents in superconducting magnet introduce magnetic errors especially at low operating fields. In addition, their decay causes magnetic field variations and therefore drifts of the beam orbits, tunes and chromaticities. To reduce field errors and suppress magnetic field variations, a new magnetic cycle was proposed for the low-energy beam operation at the Relativistic Heavy Ion Collider (RHIC). In the new magnetic cycle, the magnet current oscillates around the nominal operating current with diminishing amplitude a few times before it settles. The new magnetic cycle has been demonstrated experimentally to reduce field errors and the amplitude of magnetic field variations significantly and is essential for the ongoing RHIC BeamEnergy Scan II (BES-II) program. This article will present beam-based experimental studies of the persistent current effects with the new magnetic cycle, and discuss its application in RHIC.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231; SC0012704
OSTI ID:
1575835
Alternate ID(s):
OSTI ID: 1574430; OSTI ID: 1604714
Report Number(s):
BNL-212344-2019-JAAM; PRABCJ; 111003
Journal Information:
Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 22 Journal Issue: 11; ISSN 2469-9888
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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The RHIC magnet system
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Figures / Tables (14)

TABLE I(p. 5)table TABLE I
FIG. 1(p. 6)figure FIG. 1
FIG. 2(p. 7)figure FIG. 2
FIG. 3(p. 8)figure FIG. 3
TABLE II(p. 8)table TABLE II
FIG. 4(p. 9)figure FIG. 4
FIG. 5(p. 10)figure FIG. 5
FIG. 6(p. 11)figure FIG. 6
TABLE III(p. 12)table TABLE III
FIG. 7(p. 13)figure FIG. 7
FIG. 8(p. 15)figure FIG. 8
FIG. 9(p. 15)figure FIG. 9
FIG. 10(p. 16)figure FIG. 10
FIG. 11(p. 16)figure FIG. 11

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Related Subjects

43 PARTICLE ACCELERATORS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY