Measuring the polarization of a rapidly precessing deuteron beam

doi:10.1103/PhysRevSTAB.17.052803

	Measuring the polarization of a rapidly precessing deuteron beam
	Bagdasarian, Z.1,2; Bertelli, S.3,4; Chiladze, D.1,2; Ciullo, G.3,4; Dietrich, J.2; Dymov, S.2,5; Eversmann, D.6; Fanourakis, G.7; Gaisser, M.2; Gebel, R.2
刊名	PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
	2014-05-28
卷号	17
ISSN号	1098-4402
DOI	10.1103/PhysRevSTAB.17.052803
文献子类	Article
英文摘要	This paper describes a time-marking system that enables a measurement of the in-plane (horizontal) polarization of a 0.97-GeV/c deuteron beam circulating in the Cooler Synchrotron (COSY) at the Forschungszentrum Julich. The clock time of each polarimeter event is used to unfold the 120-kHz spin precession and assign events to bins according to the direction of the horizontal polarization. After accumulation for one or more seconds, the down-up scattering asymmetry can be calculated for each direction and matched to a sinusoidal function whose magnitude is proportional to the horizontal polarization. This requires prior knowledge of the spin tune or polarization precession rate. An initial estimate is refined by resorting the events as the spin tune is adjusted across a narrow range and searching for the maximum polarization magnitude. The result is biased toward polarization values that are too large, in part because of statistical fluctuations but also because sinusoidal fits to even random data will produce sizable magnitudes when the phase is left free to vary. An analysis procedure is described that matches the time dependence of the horizontal polarization to templates based on emittance-driven polarization loss while correcting for the positive bias. This information will be used to study ways to extend the horizontal polarization lifetime by correcting spin tune spread using ring sextupole fields and thereby to support the feasibility of searching for an intrinsic electric dipole moment using polarized beams in a storage ring. This paper is a combined effort of the Storage Ring EDM collaboration and the JEDI collaboration.
资助项目	Brookhaven Science Associates, LLC[DE-AC02-98CH10886]
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000336766600002
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/49203]
专题	中国科学院近代物理研究所
通讯作者	Bagdasarian, Z.
作者单位	1.Tbilisi State Univ, High Energy Phys Inst, GE-0186 Tbilisi, Rep of Georgia 2.Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany 3.Univ Ferrara, I-44100 Ferrara, Italy 4.Ist Nazl Fis Nucl, I-44100 Ferrara, Italy 5.Joint Inst Nucl Res, Lab Nucl Problems, RU-141980 Dubna, Russia 6.Rhein Westfal TH Aachen, Phys Inst B 3, D-52056 Aachen, Germany 7.Inst Nucl Phys NCSR Demokritos, GR-15310 Athens, Greece 8.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 9.Univ Munich, D-80539 Munich, Germany 10.Univ Klinikum Heidelberg, D-69120 Heidelberg, Germany
推荐引用方式 GB/T 7714	Bagdasarian, Z.,Bertelli, S.,Chiladze, D.,et al. Measuring the polarization of a rapidly precessing deuteron beam[J]. PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS,2014,17.
APA	Bagdasarian, Z..,Bertelli, S..,Chiladze, D..,Ciullo, G..,Dietrich, J..,...&Wuestner, P..(2014).Measuring the polarization of a rapidly precessing deuteron beam.PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS,17.
MLA	Bagdasarian, Z.,et al."Measuring the polarization of a rapidly precessing deuteron beam".PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS 17(2014).