Measuring the Electric Dipole Moment of the Electron at Wilson Lab (Revised)
نویسنده
چکیده
Of the various schemes described in an earlier version of this report for measuring the electric dipole moment (EDM) of the electron at Wilson Lab, only one survives as a realistic candidate. (One of the discarded schemes had been investigated earlier by Orlov et al.[12] for protons and shown not to work.) The proposed ring uses a 14.5MeV electron beam in an allelectric ring with resonant longitudinal polarimetry. With spin tune Qs = 0, the spin is frozen globally. Only single beam operation is considered, with, for example, one bunch. The bending field acting on the vertical EDM produces an accumulating, deviation-from-null, longitudinal polarization component. It is shown that there is neither risk nor cost uncertainty concerning the construction and commissioning at Wilson laboratory of such an all-electric storage ring. It would be patterned after the successful Brookhaven AGS Analogue Electron Ring. However, the precision with which the electron EDM can be measured remains uncertain. Rather than using simultaneously counter-circulating beams to cancel radial magnetic field errors (as has been proposed previously) here it is proposed to measure the counter-circulating beams sequentially rather than in colliding beam mode. This requires the development of highly accurate and highly stable digital nulling records at every BPM and accurate active emulation of the other beam. From statistical noise considerations alone, with (unrealistically) no allowance whatsoever for systematic errors, a five sigma deviation from zero determination of an electron EDM of 10−29 ecm could be obtained in a year-long run. Systematic errors are expected to be as much as one hundred times greater, at least in a first generation of the experiment.
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تاریخ انتشار 2013