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Title: The Jefferson Lab Frozen Spin Target

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 relaxation times as high as 4000 hours were observed. We also report polarization results for deuterated propanediol doped with the trityl radical OX063.
Authors:
Publication Date:
OSTI Identifier:
1045913
Report Number(s):
JLAB-PHY-12-1505; DOE/OR/23177-2035; arXiv:1204.1250
Journal ID: ISSN 0168-9002; NIMAER; TRN: US1203691
DOE Contract Number:
AC05-06OR23177
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research, Section A; Journal Volume: 684
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BUTANOLS; DIPOLES; PHOTONS; PHOTOPRODUCTION; POLARIZATION; POLARIZED TARGETS; PROTONS; RADICALS; RELAXATION TIME; SOLENOIDS; SPECTROMETERS; SPIN; SUPERCONDUCTING COILS; TARGETS