Guidoboni, G. (2013) Spin coherence time measurements for a polarized deuteron beam. Il nuovo cimento C, 36 (4). pp. 29-38. ISSN 1826-9885
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Abstract
The measurement of a non-zero electric dipole moment (EDM) of a fundamental particle would probe new physics beyond the standard model. It has been proposed to search for the EDM of charged particles using a storage ring. The polarization of the charged particle beam is initially aligned along the velocity and the EDM signal would be a rotation of this polarization into the vertical direction as a consequence of the radial electric field always present in the particle frame. This experiment requires ring conditions that can ensure a longitudinal, and stable, polarization (spin coherence time, SCT) up to 1000 s. A study is beginning at the COoler SYnchrotron (COSY) located at the Forschungszentrum-J¨ulich to examine the effects of emittance and momentum spread on the SCT of a polarized deuteron beam at 0.97 GeV/c. A special DAQ has been developed in order to provide the first direct measurement of a rapidly rotating horizontal polarization as a function of time. The preliminary tests presented here will show how the horizontal emittance affects the spin coherence time and how the SCT can be increased using sextupole magnets. The longest horizontal polarization lifetime recorded is τ (1/e) = 316±40 s.
| Item Type: | Article |
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| Uncontrolled Keywords: | Storage rings and colliders ; Beam dynamics; collective effects and instabilities ; Polarized beams in particle accelerators ; Positive-ion beams |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 05 May 2020 13:01 |
| Last Modified: | 05 May 2020 13:01 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/18282 |
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