Ion polarization control in MEIC rings using small magnetic fields integrals
The Electron-Ion Collider (EIC) proposed by Jefferson Lab is designed to provide high polarization of both colliding beams. In comparison to conventional circular colliders, its figure 8 shaped rings provide a unique capability to control the polarization of any particle species including deuterons by using small magnetic field integrals. This expands the experimental opportunities at EIC. We present schemes for preserving the particle polarization during acceleration in the pre-booster and large booster. We also present schemes for controlling the ion polarization up to the energy of 100 GeV in the collider ring that allow one to adjust the beam polarization in any orientation in its experimental straights. The deuteron polarization is controlled by weak solenoids while the proton polarization is controlled by weak radial fields. The components of these schemes are optically transparent to the orbital motion when integrated into the magnetic structure of the rings. We use the spin response function formalism to evaluate the zeroth harmonic of the spin perturbation and investigate the possibility of its compensation. For control of the proton polarization in the high-energy stage at energies above 100 GeV, we plan to use the conventional approach of Siberian snakes and spin rotators.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1989449
- Report Number(s):
- JLAB-ACP-13-1845; DOE/OR/23177-3756
- Resource Relation:
- Conference: Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)
- Country of Publication:
- United States
- Language:
- English
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