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Title: Spin-Manipulating Polarized Deuterons

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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
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Resource Relation:
Journal Name: Conf.Proc.C110328:747-751,2011; Conference: Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr 2011, New York, USA
Country of Publication:
United States

Citation Formats

Stephenson, E.J., /Indiana U., IUCF, Chao, A., /SLAC, Kondratenko, A.M., /Unlisted, Morozov, V.S., /Jefferson Lab, Hinterberger, F., /Unlisted, Krisch, A.D., Leonova, M.A., Raymond, R.S., Sivers, D.W., Wong, V.K., and /Michigan U. Spin-Manipulating Polarized Deuterons. United States: N. p., 2016. Web.
Stephenson, E.J., /Indiana U., IUCF, Chao, A., /SLAC, Kondratenko, A.M., /Unlisted, Morozov, V.S., /Jefferson Lab, Hinterberger, F., /Unlisted, Krisch, A.D., Leonova, M.A., Raymond, R.S., Sivers, D.W., Wong, V.K., & /Michigan U. Spin-Manipulating Polarized Deuterons. United States.
Stephenson, E.J., /Indiana U., IUCF, Chao, A., /SLAC, Kondratenko, A.M., /Unlisted, Morozov, V.S., /Jefferson Lab, Hinterberger, F., /Unlisted, Krisch, A.D., Leonova, M.A., Raymond, R.S., Sivers, D.W., Wong, V.K., and /Michigan U. Tue . "Spin-Manipulating Polarized Deuterons". United States. doi:.
title = {Spin-Manipulating Polarized Deuterons},
author = {Stephenson, E.J. and /Indiana U., IUCF and Chao, A. and /SLAC and Kondratenko, A.M. and /Unlisted and Morozov, V.S. and /Jefferson Lab and Hinterberger, F. and /Unlisted and Krisch, A.D. and Leonova, M.A. and Raymond, R.S. and Sivers, D.W. and Wong, V.K. and /Michigan U.},
abstractNote = {},
doi = {},
journal = {Conf.Proc.C110328:747-751,2011},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 09 00:00:00 EDT 2016},
month = {Tue Aug 09 00:00:00 EDT 2016}

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  • Spin dynamics of polarized deuteron beams near depolarization resonances, including a new polarization preservation concept based on specially-designed multiple resonance crossings, has been tested in a series of experiments in the COSY synchrotron. Intricate spin dynamics with sophisticated pre-programmed patterns as well as effects of multiple crossings of a resonance were studied both theoretically and experimentally with excellent agreement. Possible applications of these results to preserve, manipulate and spin-flip polarized beams in synchrotrons and storage rings are discussed.
  • We studied spin manipulation of 1.85 GeV/c polarized deuteron beam stored in COSY obtaining a spin-flip efficiency of 97{+-}1%. We first discovered experimentally and then explained theoretically interesting behavior of the deuteron tensor polarization. We, for the first time, studied systematically spin resonance strengths induced by rf dipoles and solenoids. We found huge disagreements between the strengths measured in controlled Froissart-Stora sweeps and the theoretical values calculated using the well-known formulae. These data instigated re-examination of these formulae. We tested Chao's proposed new matrix formalism for describing the spin dynamics due to a single spin resonance, which may be themore » first fundamental improvement of the Froissart-Stora equation in that it allows analytic calculation of the beam polarization's behavior inside a resonance. Our measurements of the deuteron's polarization near and inside the resonance agreed precisely with the Chao formalism's predicted oscillations. We tested Kondratenko's proposal to overcome depolarizing resonances by ramping through them with a crossing pattern, which should force the depolarizing contributions to cancel themselves. Our first test of this idea with 2.1 GeV/c protons was not conclusive but a later test with 1.85 GeV/c deuterons demonstrated a rather substantial reduction in the depolarization compared to the tune jump at the same rate.« less
  • New techniques for production of highly polarized Hup-arrowD, up-arrowDup-arrowD and up-arrowDup-arrowT solids in the 'frozen-spin' mode have been conceived and are under investigation, spurred by their potential application as nuclear fusion fuels. The up-arrowDup-arrowD methods are directly applicable to spin-physics targets, and up-arrowHup-arrowD targets superior to those previously described are expected from development of the new technique. The new techniques feature relaxation rate switching modes faster than the symmetry species conversion previously described (for example, radiation damage-anneal cycles), and epitaxial deposition of molecular isotopic variants on metastably polarized up-arrowHup-arrowD or up-arrowDup-arrowD blocks at T = 1-4K an in fractional Teslamore » holding fields, wherein spin diffusion produces high polarization in the deposited layer even in the presence of considerable heat generation from internal radiation or symmetry species conversion. Production of polarized up-arrowHup-arrowD and up-arrowDup-arrowD liquids appears feasible, as well as positively or negatively charged up-arrowH, up-arrowD and up-arrowT beams from ablation polarized solids.« less