Abstract
The physics program at the future electron ion collider (EIC) calls for polarized neutron beams at high energies. The best neutron carriers are $^{3}\mathrm{He}$ nuclei and deuterons. Both neutron carriers are expected to be utilized by the spin physics program in the EIC. Owing to the small magnetic moment anomaly of a deuteron particle, significantly higher magnetic fields are required for spin rotation, so that full Siberian snakes are not feasible. However, the resonance strengths are weak, and the number of resonances is small. It is possible to deal with individual resonances using conventional methods such as a betatron tune jump and vertical ac dipole for intrinsic depolarizing resonances, and a weak partial snake for imperfection resonances. This study employed a realistic magnet ramp rate and parameters (both transverse and longitudinal emittances, as well as realistic lattices) to show that it is possible to accelerate polarized deuterons beyond 100 GeV/n. This paper summarizes the details of the feasibility of a polarized deuteron beam for the future EIC at Brookhaven National Laboratory.
Highlights
The collision of polarized proton beams has been an essential component of the Relativistic Heavy Ion Collider (RHIC) operations in the past two decades
The electron ion collider (EIC) is under design at Brookhaven National Laboratory (BNL), and will utilize one of the existing RHIC rings as an ion ring
The possibility of accelerating polarized deuterons in the BNL EIC has been explored in detail
Summary
The collision of polarized proton beams has been an essential component of the Relativistic Heavy Ion Collider (RHIC) operations in the past two decades. A stronger partial snake can be utilized to generate a sufficiently large spin-tune gap such that the intrinsic resonances can be avoided when the betatron tune is in the spin-tune gap [11] These ideas have previously been tested in the AGS. It has been proposed to overcome intrinsic resonances using a fast vertical tune jump of 0.003 in one turn [12] or an ac dipole [13]. These analyses were mostly conducted before RHIC was operational. A comparison between the vertical components for the deuteron and proton in the AtR transfer line is presented in Figs. 1 and 2
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