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Title: Minimization of spin tune spread for preservation of spin polarization at RHIC

Abstract

The spin structure of the proton is one of the unsolved problems in physics. The Relativistic Heavy Ion Collider (RHIC) Spin Physics Program has been conducting research to investigate the spin structure by colliding high energy polarized proton beams. Maintaining high spin polarization while achieving high luminosity is critical for this program. Two of the challenges related to the program are to maintain spin polarization during spin flipping, a process designed to reduce systematic errors in spin asymmetry measurements, and during beam acceleration from the low energy source to the high energy collision experiment. Recently, a modification of the accelerator’s magnet configuration (optics) was developed for reducing the spin tune spread. With the new optics implemented, higher spin flipping efficiency was achieved at both injection and top beam energies. The spin tune spread was additionally minimized during beam acceleration and the transmission efficiency of spin polarization was evaluated. In this report the modifications needed for minimizing the spin tune spread and their impact on the global beam optics are described.

Authors:
 [1];  [1];  [1];  [1]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1526789
Alternate Identifier(s):
OSTI ID: 1530521
Report Number(s):
BNL-211827-2019-JAAM
Journal ID: ISSN 2469-9888; PRABCJ
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 22; Journal Issue: 6; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Liu, C., Kewisch, J., Huang, H., and Minty, M. Minimization of spin tune spread for preservation of spin polarization at RHIC. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.061002.
Liu, C., Kewisch, J., Huang, H., & Minty, M. Minimization of spin tune spread for preservation of spin polarization at RHIC. United States. doi:10.1103/PhysRevAccelBeams.22.061002.
Liu, C., Kewisch, J., Huang, H., and Minty, M. Tue . "Minimization of spin tune spread for preservation of spin polarization at RHIC". United States. doi:10.1103/PhysRevAccelBeams.22.061002.
@article{osti_1526789,
title = {Minimization of spin tune spread for preservation of spin polarization at RHIC},
author = {Liu, C. and Kewisch, J. and Huang, H. and Minty, M.},
abstractNote = {The spin structure of the proton is one of the unsolved problems in physics. The Relativistic Heavy Ion Collider (RHIC) Spin Physics Program has been conducting research to investigate the spin structure by colliding high energy polarized proton beams. Maintaining high spin polarization while achieving high luminosity is critical for this program. Two of the challenges related to the program are to maintain spin polarization during spin flipping, a process designed to reduce systematic errors in spin asymmetry measurements, and during beam acceleration from the low energy source to the high energy collision experiment. Recently, a modification of the accelerator’s magnet configuration (optics) was developed for reducing the spin tune spread. With the new optics implemented, higher spin flipping efficiency was achieved at both injection and top beam energies. The spin tune spread was additionally minimized during beam acceleration and the transmission efficiency of spin polarization was evaluated. In this report the modifications needed for minimizing the spin tune spread and their impact on the global beam optics are described.},
doi = {10.1103/PhysRevAccelBeams.22.061002},
journal = {Physical Review Accelerators and Beams},
number = 6,
volume = 22,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.22.061002

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