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

Journal Article · · Physical Review Accelerators and Beams
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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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0012704
OSTI ID:
1526789
Alternate ID(s):
OSTI ID: 1530521
Report Number(s):
BNL-211827-2019-JAAM; PRABCJ; 061002
Journal Information:
Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 22 Journal Issue: 6; ISSN 2469-9888
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (24)

Polarized Proton Acceleration in AGS and RHIC conference January 2008
Observation of Higher-Order Snake Resonances in Polarized Proton Acceleration in RHIC journal July 2003
High Spin-Flip Efficiency at 255 GeV for Polarized Protons in a Ring With Two Full Siberian Snakes journal June 2018
Exploration of horizontal intrinsic spin resonances with two partial Siberian snakes journal April 2007
Overcoming horizontal depolarizing resonances with multiple tune jumps journal August 2014
Achieving 99.9% Proton Spin-Flip Efficiency At Higher Energy With A Small rf Dipole journal November 2004
Simultaneous global coupling and vertical dispersion correction in RHIC journal June 2014
Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes journal October 2007
Spin flipping a stored polarized proton beam with an rf dipole journal April 2000
RHIC project overview
  • Harrison, M.; Ludlam, T.; Ozaki, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3 https://doi.org/10.1016/S0168-9002(02)01937-X
journal March 2003
Properties of partially excited Siberian Snakes conference January 1989
RHIC Spin Flipper Commissioning
  • Bai, M.
  • SPIN 2002: 15th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters, AIP Conference Proceedings https://doi.org/10.1063/1.1607239
conference January 2003
Optically pumped polarized H− ion source for RHIC spin physics journal February 2002
Polarized proton collider at RHIC
  • Alekseev, I.; Allgower, C.; Bai, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3 https://doi.org/10.1016/S0168-9002(02)01946-0
journal March 2003
Acceleration of polarized protons to 22 GeV/ c and the measurement of spin-spin effects in p ↑ + p ↑ →p+ p journal January 1989
Beam-beam effects with large dispersion function at the interaction point
  • Gerasimov, A. L.; Shatilov, D. N.; Zholents, A. A.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 305, Issue 1 https://doi.org/10.1016/0168-9002(91)90515-R
journal July 1991
Preservation of Proton Polarization by a Partial Siberian Snake journal November 1994
Helical spin rotators and snakes
  • Ptitsin, V.; Shatunov, Yu. M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 398, Issue 2-3 https://doi.org/10.1016/S0168-9002(97)00683-9
journal October 1997
The spin structure of the proton journal November 2005
Spin Flipping in the Presence of a Full Siberian Snake journal October 1998
Polarization response of RHIC electron lens lattices journal October 2016
Spin Dynamics and Snakes in Synchrotrons book June 1997
Full spin flipping in the presence of full Siberian Snake journal September 2008
9 9 . 6 % Spin-Flip Efficiency in the Presence of a Strong Siberian Snake journal December 2001

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