TY - GEN
T1 - Polarimeter and Spin Coherence Time Developments at COSY for a Storage Ring EDM Search
AU - Stephenson, EJ
AU - Onderwater, Cornelis
N1 - Event: Proc. 8th International Conference on Nuclear Physics at Storage Rings, Frascati (Rome), Italy, October 9-14, 2011; Proc. 8th International Conference on Nuclear Physics at Storage Rings, Frascati (Rome), Italy, October 9-14, 2011 ; Conference date: 01-01-2011 Through 01-01-2011
PY - 2011
Y1 - 2011
N2 - The Cooler Synchrotron (COSY) located at the Forschungszentrum Jülich along with the EDDA scintillation detectors have been used with a 0.97-GeV/c polarized deuteron beam to demonstrate the feasibility of high efficiency polarimetry, correction of systematic errors, and long spin coherence times in preparation for the design and construction of a new storage ring to search for an electric dipole moment on the proton, deuteron, or other light nuclei. Slow extraction of the stored beam onto a 1.5-cm thick carbon target yielded an efficiency (usefully detected particles divided by particles lost from the beam) near 10-3 and average 3Ay/2 = 0.67(4). Calibration of the polarimeter's sensitivity to geometric and rate-induced systematic errors made possible the real time correction of such errors based on combinations of the primary detector rates to the level of 10-5 with the prospect for lower errors in the EDM search. Recently, new studies of manipulations of the stored beam polarization using an RF solenoid operating on the 1-Gγ resonance demonstrated a spin coherence lifetime of minutes for a horizontally-polarized and electron-cooled beam without a Siberian Snake. Preparations are underway for examining the use of sextupole fields in the ring to lengthen this lifetime.
AB - The Cooler Synchrotron (COSY) located at the Forschungszentrum Jülich along with the EDDA scintillation detectors have been used with a 0.97-GeV/c polarized deuteron beam to demonstrate the feasibility of high efficiency polarimetry, correction of systematic errors, and long spin coherence times in preparation for the design and construction of a new storage ring to search for an electric dipole moment on the proton, deuteron, or other light nuclei. Slow extraction of the stored beam onto a 1.5-cm thick carbon target yielded an efficiency (usefully detected particles divided by particles lost from the beam) near 10-3 and average 3Ay/2 = 0.67(4). Calibration of the polarimeter's sensitivity to geometric and rate-induced systematic errors made possible the real time correction of such errors based on combinations of the primary detector rates to the level of 10-5 with the prospect for lower errors in the EDM search. Recently, new studies of manipulations of the stored beam polarization using an RF solenoid operating on the 1-Gγ resonance demonstrated a spin coherence lifetime of minutes for a horizontally-polarized and electron-cooled beam without a Siberian Snake. Preparations are underway for examining the use of sextupole fields in the ring to lengthen this lifetime.
M3 - Conference article in proceeding
BT - Proceedings of Science
ER -