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The Jefferson Lab Frozen Spin Target | | C.D. Keith
; J. Brock
; C. Carlin
; S.A. Comer
; D. Kashy
; J. McAndrew
; D.G. Meekins
; E. Pasyuk
; J.J Pierce
; M.L. Seely
; | | Date: |
5 Apr 2012 | | Abstract: | A frozen spin polarized target, constructed at Jefferson Lab for use inside a
large acceptance spectrometer, is described. The target has been utilized for
photoproduction measurements with polarized tagged photons of both longitudinal
and circular polarization. Protons in TEMPO-doped butanol were dynamically
polarized to approximately 90% outside the spectrometer at 5 T and 200--300 mK.
Photoproduction data were acquired with the target inside the spectrometer at a
frozen-spin temperature of approximately 30 mK with the polarization maintained
by a thin, superconducting coil installed inside the target cryostat. A 0.56 T
solenoid was used for longitudinal target polarization and a 0.50 T dipole for
transverse polarization. Spin-lattice relaxation times as high as 4000 hours
were observed. We also report polarization results for deuterated propanediol
doped with the trityl radical OX063. | | Source: | arXiv, 1204.1250 | | Services: | Forum | Review | PDF | Favorites | |
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