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How to Reach a Thousand-Second In-Plane Polarization Lifetime with 0.97-GeV/c Deuterons in a Storage Ring

Abstract

We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of a magnetic storage ring (COSY). This long spin coherence time is maintained through a combination of beam bunching, electron cooling, sextupole field corrections, and the suppression of collective effects through beam current limits. This record lifetime is required for a storage ring search for an intrinsic electric dipole moment on the deuteron at a statistical sensitivity level approaching 10^-29 e cm.

G. Guidoboni et al. (JEDI Collaboration), Physical Review Letters 117 (2016) 054801

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