Beams Document 4119-v1

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Storage Ring Measurement of Electric Dipole Moments of Protons and Other Baryons

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Alexander Sukhanov
Updated by:
Alexander Sukhanov
Document Created:
24 Apr 2012, 17:30
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24 Apr 2012, 17:30
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24 Apr 2012, 17:30
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Electric dipole moment (EDM) measurements may help to answer the question ``Why is there more matter than antimatter in the present universe?''. For a charged baryon like the proton such a measurement is thinkable only in a ring in which a bunch of protons is stored for more than a few minutes, with polarization "frozen" (relative to the beam velocity) and with the polarization not attenuated by decoherence. Lattices with these capabilities are described, including one, as an all-electric example, situated in the Tevatron accumulator tunnel. Rings for later measurements of other charged baryons, such as the deuteron or helium-3 nuclei, are more complicated. "Precursor" experiments are also described in which an electrostatic separator borrowed from the Tevatron is used as a prototype bending element in the COSY ring in Juelich Germany.
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