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Title: High spin flip efficiency at 255GeV for polarized protons in a ring with two full Siberian Snakes

In polarized proton collision experiments, it is highly advantageous to flip the spin of each bunch of protons during the stores to reduce the systematic errors . Experiments done at energies less than 2GeV have demonstrated a spin flip efficiency over 99%. At high energy colliders with Siberian Snakes, a single magnet spin flipper does not work because of t he large spin tune spread and the generation of multiple, overlapping resonances. A more sophisticated spin flipper, constructed of 9-dipole magnets was used to flip the spin in Relativistic Heavy Ion Collider(RHIC). Special optics choice was also used to make the spin tune spread very small. A 97% spin flip efficiency was measured both at 24GeV and 255GeV. Lastly, these results show that efficient spin flipping can be achieved at high energies using a 9-magnet spin flipper.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-205736-2018-JAAM
Journal ID: ISSN 0031--9007
Grant/Contract Number:
SC0012704; AC02-98CH10886
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 26; Journal ID: ISSN 0031--9007
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1440356
Alternate Identifier(s):
OSTI ID: 1457585

Huang, Haixin, Kewisch, J., Liu, C., Marusic, A., Meng, W., Meot, F., Oddo, P., Ptitsyn, V., Ranjbar, V., and Roser, T.. High spin flip efficiency at 255GeV for polarized protons in a ring with two full Siberian Snakes. United States: N. p., Web. doi:10.1103/PhysRevLett.120.264804.
Huang, Haixin, Kewisch, J., Liu, C., Marusic, A., Meng, W., Meot, F., Oddo, P., Ptitsyn, V., Ranjbar, V., & Roser, T.. High spin flip efficiency at 255GeV for polarized protons in a ring with two full Siberian Snakes. United States. doi:10.1103/PhysRevLett.120.264804.
Huang, Haixin, Kewisch, J., Liu, C., Marusic, A., Meng, W., Meot, F., Oddo, P., Ptitsyn, V., Ranjbar, V., and Roser, T.. 2018. "High spin flip efficiency at 255GeV for polarized protons in a ring with two full Siberian Snakes". United States. doi:10.1103/PhysRevLett.120.264804.
@article{osti_1440356,
title = {High spin flip efficiency at 255GeV for polarized protons in a ring with two full Siberian Snakes},
author = {Huang, Haixin and Kewisch, J. and Liu, C. and Marusic, A. and Meng, W. and Meot, F. and Oddo, P. and Ptitsyn, V. and Ranjbar, V. and Roser, T.},
abstractNote = {In polarized proton collision experiments, it is highly advantageous to flip the spin of each bunch of protons during the stores to reduce the systematic errors . Experiments done at energies less than 2GeV have demonstrated a spin flip efficiency over 99%. At high energy colliders with Siberian Snakes, a single magnet spin flipper does not work because of t he large spin tune spread and the generation of multiple, overlapping resonances. A more sophisticated spin flipper, constructed of 9-dipole magnets was used to flip the spin in Relativistic Heavy Ion Collider(RHIC). Special optics choice was also used to make the spin tune spread very small. A 97% spin flip efficiency was measured both at 24GeV and 255GeV. Lastly, these results show that efficient spin flipping can be achieved at high energies using a 9-magnet spin flipper.},
doi = {10.1103/PhysRevLett.120.264804},
journal = {Physical Review Letters},
number = 26,
volume = 120,
place = {United States},
year = {2018},
month = {6}
}