RHIC Spin flipper, fast-sweep efficiency simulations

Méot, F.; Huang, H.; Kewisch, J.; Oddo, P.; Robert‐Demolaize, G.; Roser, T.

doi:10.2172/1376183

Cited by 1 publication

(2 citation statements)

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“…In the future, both spin tracking simulations [43] and experimental studies will continue to further explore the benefits of a narrower spin tune spread for optimally preserving proton polarization and maximizing polarization transmission efficiency during acceleration. To date, the sensitivity of spin flipping efficiency to the difference of D 0 at the two Siberian snakes have been confirmed by spin tracking simulations [34]. In addition, the simulations provided guidance on optimization of the sweep time [43].…”

Section: Discussionmentioning

confidence: 81%

“…A narrower spin tune spread therefore reduces the possibility of multiple crossings. Consequently, higher spin flipping efficiency can be achieved as explored in simulations [14,34]. The spin tune spread is proportional to the difference of the dispersion prime, Siberian snakes; therefore, the spin tune spread can be reduced by matching the dispersion primes at the two Siberian snakes.…”

Section: B Introduction To the Rhic Spin Flipper And The Motivation mentioning

confidence: 99%

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

Liu

Kewisch

Huang

et al. 2019

Phys. Rev. Accel. 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 also 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.

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Section: Discussionmentioning

confidence: 81%

Section: B Introduction To the Rhic Spin Flipper And The Motivation mentioning

confidence: 99%