Mitigation of persistent current effects in the RHIC superconducting magnets

Liu, C.; Bruno, D.; Marusic, A.; Minty, M.; Thieberger, P.; Wang, X.

doi:10.1103/PhysRevAccelBeams.22.111003

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:

Liu, C.;

;

; Minty, M.; Thieberger, P.;

Publication Date:: Tue Nov 26 00:00:00 EST 2019

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (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.

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                    Liu, C., Bruno, D., Marusic, A., Minty, M., Thieberger, P., & Wang, X. Mitigation of persistent current effects in the RHIC superconducting magnets.  United States.  https://doi.org/10.1103/PhysRevAccelBeams.22.111003

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                    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.  https://doi.org/10.1103/PhysRevAccelBeams.22.111003.

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@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         = {Tue Nov 26 00:00:00 EST 2019},

  month        = {Tue Nov 26 00:00:00 EST 2019}

}

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Cited by: 5 works

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Figures / Tables:

TABLE I: BES-II beam enengies and corresponding dipole currents and field strength.

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Works referenced in this record:

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Case study of a magnetic system for low-energy machines
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Improving the Luminosity for Beam Energy Scan II at RHIC
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Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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Similar Records

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

Abstract

Citation Formats

Figures / Tables:

A practical fit for the critical surface of NbTi journal, March 2000

GALAHAD, a library of thread-safe Fortran 90 packages for large-scale nonlinear optimization journal, December 2003

Degaussing and decay reduction in the short superconducting dipole models for the LHC journal, March 2002

Persistent and coupling current effects in the LHC superconducting dipoles journal, June 2003

Case study of a magnetic system for low-energy machines journal, August 2016

Improving the Luminosity for Beam Energy Scan II at RHIC text, January 2019

Beam-based measurements of persistent current decay in the Relativistic Heavy Ion Collider journal, April 2001

Chromaticity decay due to superconducting dipoles on the injection plateau of the Large Hadron Collider journal, March 2012

Calculation of persistent currents in superconducting magnets journal, December 2000

The RHIC magnet system journal, March 2003

Magnetization of Hard Superconductors journal, March 1962

Theory of Flux Creep in Hard Superconductors journal, October 1962

The Bean Model in Superconductivity: Variational Formulation and Numerical Solution journal, November 1996

Handbook of Accelerator Physics and Engineering book, May 2013

Critical Persistent Currents in Hard Superconductors journal, October 1962

Compensation of time-dependent persistent current effects in superconducting synchrotrons journal, June 1994

A practical fit for the critical surface of NbTi
journal, March 2000

GALAHAD, a library of thread-safe Fortran 90 packages for large-scale nonlinear optimization
journal, December 2003

Degaussing and decay reduction in the short superconducting dipole models for the LHC
journal, March 2002

Persistent and coupling current effects in the LHC superconducting dipoles
journal, June 2003

Case study of a magnetic system for low-energy machines
journal, August 2016

Improving the Luminosity for Beam Energy Scan II at RHIC
text, January 2019

Beam-based measurements of persistent current decay in the Relativistic Heavy Ion Collider
journal, April 2001

Chromaticity decay due to superconducting dipoles on the injection plateau of the Large Hadron Collider
journal, March 2012

Calculation of persistent currents in superconducting magnets
journal, December 2000

The RHIC magnet system
journal, March 2003

Magnetization of Hard Superconductors
journal, March 1962

Theory of Flux Creep in Hard Superconductors
journal, October 1962

The Bean Model in Superconductivity: Variational Formulation and Numerical Solution
journal, November 1996

Handbook of Accelerator Physics and Engineering
book, May 2013

Critical Persistent Currents in Hard Superconductors
journal, October 1962

Compensation of time-dependent persistent current effects in superconducting synchrotrons
journal, June 1994