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.Comment: 11 pages, 12 figures, preprint submitted to Nuclear Instruments and
Methods in Physics Research, Section
