Dynamically polarized target for the g 2 p and GEp experiments at Jefferson Lab

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

doi:10.1016/j.nima.2013.12.016

Dynamically polarized target for the g 2 p and GEp experiments at Jefferson Lab

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

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14 Scopus citations

Abstract

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 ⁴He 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 T. The performance of the target material in the electron beam under these conditions will be discussed. 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 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.

Original language	English
Pages (from-to)	54-60
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	738
DOIs	https://doi.org/10.1016/j.nima.2013.12.016
State	Published - Feb 21 2014
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

Keywords

Dynamic nuclear polarization
Polarized target
Superconducting magnet

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10.1016/j.nima.2013.12.016

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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. (2014). Dynamically polarized target for the g 2 p and GEp experiments at Jefferson Lab. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 738, 54-60. https://doi.org/10.1016/j.nima.2013.12.016

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title = "Dynamically polarized target for the g 2 p and GEp experiments at Jefferson Lab",

abstract = "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 4He 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 T. The performance of the target material in the electron beam under these conditions will be discussed. 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 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.",

keywords = "Dynamic nuclear polarization, Polarized target, Superconducting magnet",

author = "J. Pierce and J. Maxwell and T. Badman and J. Brock and C. Carlin and Crabb, {D. G.} and D. Day and Keith, {C. D.} and N. Kvaltine and Meekins, {D. G.} and J. Mulholland and J. Shields and K. Slifer",

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Pierce, J, Maxwell, J, Badman, T, Brock, J, Carlin, C, Crabb, DG, Day, D, Keith, CD, Kvaltine, N, Meekins, DG, Mulholland, J, Shields, J & Slifer, K 2014, 'Dynamically polarized target for the g 2 p and GEp experiments at Jefferson Lab', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 738, pp. 54-60. https://doi.org/10.1016/j.nima.2013.12.016

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T1 - Dynamically polarized target for the g 2 p and GEp experiments at Jefferson Lab

AU - Pierce, J.

AU - Maxwell, J.

AU - Badman, T.

AU - Brock, J.

AU - Carlin, C.

AU - Crabb, D. G.

AU - Day, D.

AU - Keith, C. D.

AU - Kvaltine, N.

AU - Meekins, D. G.

AU - Mulholland, J.

AU - Shields, J.

AU - Slifer, K.

PY - 2014/2/21

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N2 - 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 4He 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 T. The performance of the target material in the electron beam under these conditions will be discussed. 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 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.

AB - 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 4He 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 T. The performance of the target material in the electron beam under these conditions will be discussed. 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 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.

KW - Dynamic nuclear polarization

KW - Polarized target

KW - Superconducting magnet

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

ER -

Dynamically polarized target for the g 2 p and GEp experiments at Jefferson Lab

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