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Description
The Beam Accumulator Ring (BAR) is part of the Electron-Ion Collider (EIC) injector complex at Brookhaven National Laboratory. It is designed to accumulate a polarized 750 MeV electron beam up to a single-bunch charge of 28 nC for injection into the Rapid Cycling Synchrotron (RCS). A compact double-bend achromat lattice is based on the NSLS VUV ring. The BAR design incorporates well-proven magnet, vacuum, RF, beam diagnostics, and control technologies. Comprehensive studies of injection and extraction schemes, error correction, and collective effects demonstrate robust beam accumulation. With the bunch shortening by RF modulation to mitigate the bunch lengthening caused by the microwave instability, all beam parameters at extraction meet the specifications. The preliminary design validates BAR performance goals and establishes readiness for integration into the EIC injector chain.
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