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:
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1526789
- Alternate Identifier(s):
- OSTI ID: 1530521
- Report Number(s):
- BNL-211827-2019-JAAM
Journal ID: ISSN 2469-9888; PRABCJ; 061002
- Grant/Contract Number:
- 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: 6; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- 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. https://doi.org/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. https://doi.org/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}
}
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https://doi.org/10.1103/PhysRevAccelBeams.22.061002
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