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The Electron Ion Collider (EIC) calls for polarized helion on polarized electron collisions. These collisions will require 1.2 × 1011 ions per bunch at 70% polarization. Meeting the EIC physics requirements will require maintaining both high efficiency and high polarization transmission through the accelerator complex. Polarized helions will originate from the Electron Beam Ion Source (EBIS) and be injected into the Booster at |𝐺𝛾| = 4.1932. The injected intensity from EBIS is expected to be 2 × 1011 ions with a polarization of 80%. In the Booster, an AC dipole will be used to spin-flip across intrinsic resonances and harmonic corrections will be used for imperfection resonances, up to extraction at |𝐺𝛾|=10.5. In the Alternating Gradient Synchrotron (AGS), due to the higher anomalous g-factor of helions, the two partial snakes will have sufficient rotation to facilitate both horizontal and vertical betatron tunes being placed inside the spin-tune gap up to |𝐺𝛾|=49.5. In the Hadron Storage Ring (HSR), 6 full snakes will be used to minimize polarization loss up to a maximum energy of |𝐺𝛾|=820. At collisions, longitudinal polarization will be available through use of helical spin rotators. This paper provides a summary of polarized helion transmission from injection to the Booster to top energy in the Hadron Storage Ring.
Hock et al. (Tue,) studied this question.