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

44 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.

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",

month = aug,

day = "21",

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

language = "English",

volume = "684",

pages = "27--35",

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

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TY - JOUR

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

UR - https://www.scopus.com/pages/publications/84861413643

U2 - 10.1016/j.nima.2012.04.067

DO - 10.1016/j.nima.2012.04.067

M3 - Article

AN - SCOPUS:84861413643

SN - 0168-9002

VL - 684

SP - 27

EP - 35

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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