RHIC optics and spin dynamics with snakes and rotators

F. Méot; H. Huang; V. Ptitsyn; V. Ranjbar; G. Robert-Demolaize; V. Schoefer; V. Morozov

doi:10.1103/PhysRevAccelBeams.25.121002

RHIC optics and spin dynamics with snakes and rotators

F. Méot, H. Huang, V. Ptitsyn, V. Ranjbar, G. Robert-Demolaize, V. Schoefer, V. Morozov

Accelerator Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The operation of RHIC collider rings in polarized proton runs includes helical snakes, which allow for preserving polarization during acceleration to store energies. The RHIC lattice also includes spin rotators, operated when nonvertical polarization or corrections to the orientation of polarization at the interaction points are required. Utilization of OPERA field maps of snakes and rotators has been systematized in the past decade, in order to assess in detail the effects of these spin devices on beam polarization, and their perturbative effects on beam optics. The method is also used in ongoing studies regarding the future Electron Ion Collider, to permit increasing average store polarization to at least 70% at 275 GeV and the acceleration of polarized helion with low polarization losses. This paper reviews various applications and outcomes of these field map methods. It is thereby also a review of studies undertaken as part of beam polarization research activities at RHIC in recent years.

Original language	English
Article number	121002
Journal	Physical Review Accelerators and Beams
Volume	25
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevAccelBeams.25.121002
State	Published - Dec 2022

Funding

This research used resources from the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility located at Lawrence Berkeley National Laboratory. Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. This manuscript has been authored in part by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. DOE.

Funders	Funder number
Brookhaven Science Associates, LLC	DE-AC02-98CH10886
U.S. Department of Energy	DE-AC05-00OR22725

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10.1103/PhysRevAccelBeams.25.121002

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title = "RHIC optics and spin dynamics with snakes and rotators",

abstract = "The operation of RHIC collider rings in polarized proton runs includes helical snakes, which allow for preserving polarization during acceleration to store energies. The RHIC lattice also includes spin rotators, operated when nonvertical polarization or corrections to the orientation of polarization at the interaction points are required. Utilization of OPERA field maps of snakes and rotators has been systematized in the past decade, in order to assess in detail the effects of these spin devices on beam polarization, and their perturbative effects on beam optics. The method is also used in ongoing studies regarding the future Electron Ion Collider, to permit increasing average store polarization to at least 70% at 275 GeV and the acceleration of polarized helion with low polarization losses. This paper reviews various applications and outcomes of these field map methods. It is thereby also a review of studies undertaken as part of beam polarization research activities at RHIC in recent years.",

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AU - Ptitsyn, V.

AU - Ranjbar, V.

AU - Robert-Demolaize, G.

AU - Schoefer, V.

AU - Morozov, V.

N1 - Publisher Copyright: © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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N2 - The operation of RHIC collider rings in polarized proton runs includes helical snakes, which allow for preserving polarization during acceleration to store energies. The RHIC lattice also includes spin rotators, operated when nonvertical polarization or corrections to the orientation of polarization at the interaction points are required. Utilization of OPERA field maps of snakes and rotators has been systematized in the past decade, in order to assess in detail the effects of these spin devices on beam polarization, and their perturbative effects on beam optics. The method is also used in ongoing studies regarding the future Electron Ion Collider, to permit increasing average store polarization to at least 70% at 275 GeV and the acceleration of polarized helion with low polarization losses. This paper reviews various applications and outcomes of these field map methods. It is thereby also a review of studies undertaken as part of beam polarization research activities at RHIC in recent years.

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RHIC optics and spin dynamics with snakes and rotators

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