2012/04/05 by C. Keith, C. D. Keith, J. Brock +11 · 1 citation
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic and Subatomic Physics Research #Atomic physics #Chemistry #Condensed matter physics #Cryostat #Dipole #Nuclear magnetic resonance #Nuclear physics #Optics #Photon #Physics #Polarization (electrochemistry) #Quantum, superfluid, helium dynamics #Spectrometer #Superconductivity #Transverse plane #nucl-ex #physics.ins-det
paper · pdf · doi:10.1016/j.nima.2012.04.067
11 pages, 12 figures, preprint submitted to Nuclear Instruments and Methods in Physics Research, Section A
arxiv created 2012/04/05 · openalex publication_date 2012/05/10 · arxiv updated 2015/06/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.