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

Abstract

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.

Authors:
; ORCiD logo; ORCiD logo; ; ; ORCiD logo
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1575835
Alternate Identifier(s):
OSTI ID: 1574430; OSTI ID: 1604714
Report Number(s):
BNL-212344-2019-JAAM
Journal ID: ISSN 2469-9888; PRABCJ; 111003
Grant/Contract Number:  
AC02-05CH11231; SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 11; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Liu, C., Bruno, D., Marusic, A., Minty, M., Thieberger, P., and Wang, X. Mitigation of persistent current effects in the RHIC superconducting magnets. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.111003.
Liu, C., Bruno, D., Marusic, A., Minty, M., Thieberger, P., & Wang, X. Mitigation of persistent current effects in the RHIC superconducting magnets. United States. doi:10.1103/PhysRevAccelBeams.22.111003.
Liu, C., Bruno, D., Marusic, A., Minty, M., Thieberger, P., and Wang, X. Tue . "Mitigation of persistent current effects in the RHIC superconducting magnets". United States. doi:10.1103/PhysRevAccelBeams.22.111003.
@article{osti_1575835,
title = {Mitigation of persistent current effects in the RHIC superconducting magnets},
author = {Liu, C. and Bruno, D. and Marusic, A. and Minty, M. and Thieberger, P. and Wang, X.},
abstractNote = {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.},
doi = {10.1103/PhysRevAccelBeams.22.111003},
journal = {Physical Review Accelerators and Beams},
number = 11,
volume = 22,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.22.111003

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