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This paper describes a time-marking system that enables a measurement of thein-plane (horizontal) polarization of a 0.97-GeV/c deuteron beam circulating inthe Cooler Synchrotron (COSY) at the Forschungszentrum J\"ulich. The clock timeof each polarimeter event is used to unfold the 120-kHz spin precession andassign events to bins according to the direction of the horizontalpolarization. After accumulation for one or more seconds, the down-upscattering asymmetry can be calculated for each direction and matched to asinusoidal function whose magnitude is proportional to the horizontalpolarization. This requires prior knowledge of the spin tune or polarizationprecession rate. An initial estimate is refined by re-sorting the events as thespin tune is adjusted across a narrow range and searching for the maximumpolarization magnitude. The result is biased toward polarization values thatare too large, in part because of statistical fluctuations but also becausesinusoidal fits to even random data will produce sizeable magnitudes when thephase is left free to vary. An analysis procedure is described that matches thetime dependence of the horizontal polarization to templates based onemittance-driven polarization loss while correcting for the positive bias. Thisinformation will be used to study ways to extend the horizontal polarizationlifetime by correcting spin tune spread using ring sextupole fields and therebyto support the feasibility of searching for an intrinsic electric dipole momentusing polarized beams in a storage ring. This paper is a combined effort of theStorage Ring EDM Collaboration and the JEDI Collaboration.

Measuring the Polarization of a Rapidly Precessing Deuteron Beam