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

doi:10.1016/j.nima.2012.04.067

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

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

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 h were observed. We also report polarization results for deuterated propanediol doped with the trityl radical OX063.

Original language	English
Pages (from-to)	27-35
Number of pages	9
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	684
DOIs	https://doi.org/10.1016/j.nima.2012.04.067
State	Published - Aug 21 2012
Externally published	Yes

Funding

Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 . The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes.

Funders	Funder number
U.S. Department of Energy	DE-AC05-06OR23177

Keywords

Dilution refrigerator
Frozen-spin target
Internal holding coil
Polarized target

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10.1016/j.nima.2012.04.067

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title = "The Jefferson Lab frozen spin target",

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 h were observed. We also report polarization results for deuterated propanediol doped with the trityl radical OX063.",

keywords = "Dilution refrigerator, Frozen-spin target, Internal holding coil, Polarized target",

author = "Keith, {C. D.} and J. Brock and C. Carlin and Comer, {S. A.} and D. Kashy and J. McAndrew and Meekins, {D. G.} and E. Pasyuk and Pierce, {J. J.} and Seely, {M. L.}",

year = "2012",

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doi = "10.1016/j.nima.2012.04.067",

language = "English",

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journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

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T1 - The Jefferson Lab frozen spin target

AU - Keith, C. D.

AU - Brock, J.

AU - Carlin, C.

AU - Comer, S. A.

AU - Kashy, D.

AU - McAndrew, J.

AU - Meekins, D. G.

AU - Pasyuk, E.

AU - Pierce, J. J.

AU - Seely, M. L.

PY - 2012/8/21

Y1 - 2012/8/21

N2 - 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 h were observed. We also report polarization results for deuterated propanediol doped with the trityl radical OX063.

AB - 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 h were observed. We also report polarization results for deuterated propanediol doped with the trityl radical OX063.

KW - Dilution refrigerator

KW - Frozen-spin target

KW - Internal holding coil

KW - Polarized target

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VL - 684

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

The Jefferson Lab frozen spin target

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