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Title: Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring

Abstract

This Letter reports the first spin tune measurement at high energies (24 and 255 GeV) with a driven coherent spin motion. To maintain polarization in a polarized proton collider, it is essential to know the spin tune of the polarized proton beam, which is defined as the number of full spin precessions per revolution. A nine-magnet spin flipper has demonstrated high spin-flip efficiency in the presence of two Siberian snakes. The spin flipper drives a spin resonance with a given frequency (or tune) and strength. When the drive tune is close to the spin tune, the proton spin direction is not vertical anymore, but precesses around the vertical direction. By calculating the precession frequency of the horizontal component, the spin tune can be precisely measured. A driven coherent spin motion and fast turn-by-turn polarization measurement are keys to the measurement. The vertical spin direction is restored after turning the spin flipper off and the polarization value is not affected by the measurement. In conclusion, the fact that this manipulation preserves the polarization makes it possible to measure the spin tune during the operation of a high energy accelerator.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
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  1. Brookhaven National Lab. (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)
OSTI Identifier:
1512699
Alternate Identifier(s):
OSTI ID: 1515099
Report Number(s):
BNL-211625-2019-JAAM
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
SC0012704; AC02-98CH10886
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 20; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Huang, Haixin, Kewisch, J., Liu, C., Marusic, A., Meng, W., Méot, F., Oddo, P., Ptitsyn, V., Ranjbar, V., Roser, T., and Schmidke, W. B. Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.204803.
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Huang, Haixin, Kewisch, J., Liu, C., Marusic, A., Meng, W., Méot, F., Oddo, P., Ptitsyn, V., Ranjbar, V., Roser, T., & Schmidke, W. B. Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring. United States. https://doi.org/10.1103/PhysRevLett.122.204803
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Huang, Haixin, Kewisch, J., Liu, C., Marusic, A., Meng, W., Méot, F., Oddo, P., Ptitsyn, V., Ranjbar, V., Roser, T., and Schmidke, W. B. Wed . "Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring". United States. https://doi.org/10.1103/PhysRevLett.122.204803. https://www.osti.gov/servlets/purl/1512699.
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@article{osti_1512699,
title = {Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring},
author = {Huang, Haixin and Kewisch, J. and Liu, C. and Marusic, A. and Meng, W. and Méot, F. and Oddo, P. and Ptitsyn, V. and Ranjbar, V. and Roser, T. and Schmidke, W. B.},
abstractNote = {This Letter reports the first spin tune measurement at high energies (24 and 255 GeV) with a driven coherent spin motion. To maintain polarization in a polarized proton collider, it is essential to know the spin tune of the polarized proton beam, which is defined as the number of full spin precessions per revolution. A nine-magnet spin flipper has demonstrated high spin-flip efficiency in the presence of two Siberian snakes. The spin flipper drives a spin resonance with a given frequency (or tune) and strength. When the drive tune is close to the spin tune, the proton spin direction is not vertical anymore, but precesses around the vertical direction. By calculating the precession frequency of the horizontal component, the spin tune can be precisely measured. A driven coherent spin motion and fast turn-by-turn polarization measurement are keys to the measurement. The vertical spin direction is restored after turning the spin flipper off and the polarization value is not affected by the measurement. In conclusion, the fact that this manipulation preserves the polarization makes it possible to measure the spin tune during the operation of a high energy accelerator.},
doi = {10.1103/PhysRevLett.122.204803},
journal = {Physical Review Letters},
number = 20,
volume = 122,
place = {United States},
year = {Wed May 22 00:00:00 EDT 2019},
month = {Wed May 22 00:00:00 EDT 2019}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.122.204803
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Figures / Tables:

FIG. 1 FIG. 1: Layout of a RHIC $p$-carbon polarimeter. The target and beam are represented by a vertical line and a dot, respectively.
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Works referenced in this record:

Measurements of double-helicity asymmetries in inclusive J / ψ production in longitudinally polarized p + p collisions at s = 510 GeV
journal, December 2016

Polarized proton collider at RHIC
journal, March 2003

  • 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
  • DOI: 10.1016/S0168-9002(02)01946-0

Resonance Due to a Local Spin Rotator in High-Energy Accelerators
journal, April 1986

Spin Dynamics and Snakes in Synchrotrons
book, June 1997

High Spin-Flip Efficiency at 255 GeV for Polarized Protons in a Ring With Two Full Siberian Snakes
journal, June 2018

Full spin flipping in the presence of full Siberian Snake
journal, September 2008

Electron-Ion Collider: The next QCD frontier: Understanding the glue that binds us all
journal, September 2016

New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments
journal, August 2015

Cooler synchrotron COSY — Performance and perspectives
journal, May 1997

  • Maier, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 390, Issue 1-2
  • DOI: 10.1016/S0168-9002(97)00324-0

Phase Locking the Spin Precession in a Storage Ring
journal, July 2017

Resonance Method of Electric-Dipole-Moment Measurements in Storage Rings
journal, June 2006

Polarized proton-nucleus scattering
journal, June 2001

An absolute polarimeter for high energy protons
journal, October 2001

Spin asymmetries for elastic proton scattering and the spin-dependent couplings of the Pomeron
journal, March 2008

Fiddling Carbon Strings with Polarized Proton Beams
conference, January 2006

  • Huang, Haixin; Kurita, Kazuyoshi
  • BEAM INSTRUMENTATION WORKSHOP 2006: Twelfth Beam Instrumentation Workshop, AIP Conference Proceedings
  • DOI: 10.1063/1.2401392
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    Figures / Tables found in this record:

    FIG. 1 (p. 4)figure
    FIG. 2 (p. 5)figure
    FIG. 3 (p. 5)figure
    FIG. 4 (p. 6)figure
    FIG. 5 (p. 6)figure
    TABLE I (p. 6)table
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