Dynamically polarized target for the gp2 and GpE experiments at Jefferson Lab

Pierce, J.; Maxwell, J.; Badman, T.; Brock, J.; Carlin, C.; Crabb, D. G.; Day, D.; Keith, C. D.; Kvaltine, N.; Meekins, D. G.; Mulholland, J.; Shields, J.; Slifer, K.

doi:10.1016/j.nima.2013.12.016

Title: Dynamically polarized target for the g^p₂ and G^p_E experiments at Jefferson Lab

Journal Article · Mon Dec 16 04:00:00 UTC 2013 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI: https://doi.org/10.1016/j.nima.2013.12.016 · OSTI ID:1113528

Pierce, J. ^[1]; Maxwell, J. ^[2]; Badman, T. ^[2]; Brock, J. ^[1]; Carlin, C. ^[1]; Crabb, D. G. ^[3]; Day, D. ^[3]; Keith, C. D. ^[1]; Kvaltine, N. ^[3]; Meekins, D. G. ^[1]; Mulholland, J. ^[3]; Shields, J. ^[3]; Slifer, K. ^[2]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Univ. of New Hampshire, Durham, NH (United States)
Univ. of Virginia, Charlottesville, VA (United States)

We describe a dynamically polarized target that has been utilized for two electron scattering experiments in Hall A at Jefferson Lab. The primary components of the target are a new, high cooling power ⁴ He evaporation refrigerator, and a re-purposed, superconducting split-coil magnet. It has been used to polarize protons in irradiated NH₃ at a temperature of 1 K and at fields of 2.5 and 5.0 Tesla. The performance of the target material in the electron beam under these conditions will be discussed. The maximum polarizations of 28% and 95% were obtained at those fields, respectively. To satisfy the requirements of both experiments, the magnet had to be routinely rotated between angles of 0, 6, and 90 degrees with respect to the incident electron beam. This was accomplished using a new rotating vacuum seal which permits rotations to be performed in only a few minutes.

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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1113528

Report Number(s):: JLAB-PHY--13-1712; DOE/OR--23177-2727; arXiv:1305.3295

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Issue: C Vol. 738; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (18)

A high precision Q-meter for the measurement of proton polarization in polarised targets Court, G. R.; Gifford, D. W.; Harrison, P. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 324, Issue 3 https://doi.org/10.1016/0168-9002(93)91047-q	journal	January 1993
Observations of radiation damage and recovery in ammonia targets McKee, P. M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 526, Issue 1-2 https://doi.org/10.1016/j.nima.2004.03.151	journal	June 2004
Moments of the spin structure functions g1p and g1d for 0.05<Q2<3.0 GeV2 Prok, Y.; Bosted, P.; Burkert, V. D. Physics Letters B, Vol. 672, Issue 1 https://doi.org/10.1016/j.physletb.2008.12.063	journal	February 2009
A polarized target for the CLAS detector Keith, C. D.; Anghinolfi, M.; Battaglieri, M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 501, Issue 2-3 https://doi.org/10.1016/s0168-9002(03)00429-7	journal	April 2003
A solid polarized target for high-luminosity experiments Averett, T. D.; Crabb, D. G.; Day, D. B. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 427, Issue 3 https://doi.org/10.1016/s0168-9002(98)01431-4	journal	May 1999
Dynamic nuclear polarization at high magnetic fields Maly, Thorsten; Debelouchina, Galia T.; Bajaj, Vikram S. The Journal of Chemical Physics, Vol. 128, Issue 5 https://doi.org/10.1063/1.2833582	journal	February 2008
Observation of a 96% proton polarization in irradiated ammonia Crabb, D. G.; Higley, C. B.; Krisch, A. D. Physical Review Letters, Vol. 64, Issue 22 https://doi.org/10.1103/physrevlett.64.2627	journal	May 1990
Solid Polarized Targets for Nuclear and Particle Physics Experiments Crabb, D. G.; Meyer, W. Annual Review of Nuclear and Particle Science, Vol. 47, Issue 1 https://doi.org/10.1146/annurev.nucl.47.1.67	journal	December 1997
The Jefferson Lab Frozen Spin Target Keith, C. D.; Brock, J.; Carlin, C. arXiv https://doi.org/10.48550/arxiv.1204.1250	text	January 2012
A high precision Q-meter for the measurement of proton polarization in polarised targets Court, G. R.; Gifford, D. W.; Harrison, P. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 324, Issue 3 https://doi.org/10.1016/0168-9002(93)91047-Q	journal	January 1993
A polarized target for the CLAS detector Keith, C. D.; Anghinolfi, M.; Battaglieri, M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 501, Issue 2-3 https://doi.org/10.1016/S0168-9002(03)00429-7	journal	April 2003
A solid polarized target for high-luminosity experiments Averett, T. D.; Crabb, D. G.; Day, D. B. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 427, Issue 3 https://doi.org/10.1016/S0168-9002(98)01431-4	journal	May 1999
Observations of radiation damage and recovery in ammonia targets McKee, P. M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 526, Issue 1-2 https://doi.org/10.1016/j.nima.2004.03.151	journal	June 2004
The Jefferson Lab frozen spin target Keith, C. D.; Brock, J.; Carlin, C. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 684 https://doi.org/10.1016/j.nima.2012.04.067	journal	August 2012
Moments of the spin structure functions g1p and g1d for 0.05<Q2<3.0 GeV2 Prok, Y.; Bosted, P.; Burkert, V. D. Physics Letters B, Vol. 672, Issue 1 https://doi.org/10.1016/j.physletb.2008.12.063	journal	February 2009
Dynamic nuclear polarization at high magnetic fields Maly, Thorsten; Debelouchina, Galia T.; Bajaj, Vikram S. The Journal of Chemical Physics, Vol. 128, Issue 5 https://doi.org/10.1063/1.2833582	journal	February 2008
Observation of a 96% proton polarization in irradiated ammonia Crabb, D. G.; Higley, C. B.; Krisch, A. D. Physical Review Letters, Vol. 64, Issue 22 https://doi.org/10.1103/PhysRevLett.64.2627	journal	May 1990
Solid Polarized Targets for Nuclear and Particle Physics Experiments Crabb, D. G.; Meyer, W. Annual Review of Nuclear and Particle Science, Vol. 47, Issue 1 https://doi.org/10.1146/annurev.nucl.47.1.67	journal	December 1997

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Title: Dynamically polarized target for the g^p₂ and G^p_E experiments at Jefferson Lab