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Title: Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized 3He neutron spin-filter

Accurately measuring the neutron beam polarization of a high flux, large area neutron beam is necessary for many neutron physics experiments. The Fundamental Neutron Physics Beamline (FnPB) at the Spallation Neutron Source (SNS) is a pulsed neutron beam that was polarized with a supermirror polarizer for the NPDGamma experiment. The polarized neutron beam had a flux of ~10 9 neutrons per second per cm 2 and a cross sectional area of 10 x 12 cm 2. The polarization of this neutron beam and the efficiency of a RF neutron spin rotator installed downstream on this beam were measured by neutron transmission through a polarized 3He neutron spin-filter. The pulsed nature of the SNS enabled us to employ an absolute measurement technique for both quantities which does not depend on accurate knowledge of the phase space of the neutron beam or the 3He polarization in the spin filter and is therefore of interest for any experiments on slow neutron beams from pulsed neutron sources which require knowledge of the absolute value of the neutron polarization. The polarization and spin-reversal efficiency measured were done for the NPDGamma experiment, which measures the parity violating γ-ray angular distribution asymmetry with respect to the neutronmore » spin direction in the capture of polarized neutrons on protons. Finally, the experimental technique, results, systematic effects, and applications to neutron capture targets are discussed.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6] ;  [5] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [13] ;  [14] ;  [9] ;  [15] ;  [5] more »;  [9] ;  [11] ;  [5] ;  [5] ;  [16] ;  [7] ;  [17] ;  [13] ;  [18] « less
  1. Univ. of Tennessee, Knoxville, TN (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of Virginia, Charlottesville, VA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Arizona State Univ., Tempe, AZ (United States)
  4. National Autonomous Univ. of Mexico (UNAM), Mexico City (Mexico). Inst. of Physics
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Michigan, Ann Arbor, MI (United States)
  7. Univ. of Kentucky, Lexington, KY (United States)
  8. Univ. of Tennessee, Knoxville, TN (United States); Univ. of Kentucky, Lexington, KY (United States)
  9. Univ. of Tennessee, Knoxville, TN (United States)
  10. Univ. of Virginia, Charlottesville, VA (United States); Indiana Univ., Bloomington, IN (United States)
  11. Univ. of Manitoba, Winnipeg, MB (Canada)
  12. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Indiana Univ., Bloomington, IN (United States)
  13. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  14. Univ. of Tennessee, Chattanooga, TN (United States)
  15. North Carolina State Univ., Raleigh, NC (United States)
  16. Indiana Univ., Bloomington, IN (United States)
  17. Indiana Univ., Bloomington, IN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  18. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-18-23163
Journal ID: ISSN 0168-9002
Grant/Contract Number:
AC05-00OR22725; FG02-03ER41258; SC0008107; SC0014622; PHY-1306942; PHY-1614545; NSF-0855610; NSF-1205833; SAPPJ 341289-2013; 89233218CNA000001
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 895; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Univ. of Kentucky, Lexington, KY (United States); Indiana Univ., Bloomington, IN (United States); Univ. of Virginia, Charlottesville, VA (United States); Univ. of Manitoba, Winnipeg, MB (Canada); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); Canada Foundation for Innovation (CFI); USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26); Natural Sciences and Engineering Council of Canada (NSERC)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; polarized neutrons; polarized 3He; polarimetry; spin-exchange optical pumping; NPDGamma
OSTI Identifier:
1483524
Alternate Identifier(s):
OSTI ID: 1479758

Musgrave, M. M., Baeßler, S., Balascuta, S., Barrón-Palos, L., Blyth, D., Bowman, J. D., Chupp, T. E., Cianciolo, V., Crawford, C., Craycraft, K., Fomin, N., Fry, J., Gericke, M., Gillis, R. C., Grammer, K., Greene, G. L., Hamblen, J., Hayes, C., Huffman, P., Jiang, C., Kucuker, S., McCrea, M., Mueller, P. E., Penttilä, S. I., Snow, W. M., Tang, E., Tang, Z., Tong, X., and Wilburn, W. S.. Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized 3He neutron spin-filter. United States: N. p., Web. doi:10.1016/j.nima.2018.03.055.
Musgrave, M. M., Baeßler, S., Balascuta, S., Barrón-Palos, L., Blyth, D., Bowman, J. D., Chupp, T. E., Cianciolo, V., Crawford, C., Craycraft, K., Fomin, N., Fry, J., Gericke, M., Gillis, R. C., Grammer, K., Greene, G. L., Hamblen, J., Hayes, C., Huffman, P., Jiang, C., Kucuker, S., McCrea, M., Mueller, P. E., Penttilä, S. I., Snow, W. M., Tang, E., Tang, Z., Tong, X., & Wilburn, W. S.. Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized 3He neutron spin-filter. United States. doi:10.1016/j.nima.2018.03.055.
Musgrave, M. M., Baeßler, S., Balascuta, S., Barrón-Palos, L., Blyth, D., Bowman, J. D., Chupp, T. E., Cianciolo, V., Crawford, C., Craycraft, K., Fomin, N., Fry, J., Gericke, M., Gillis, R. C., Grammer, K., Greene, G. L., Hamblen, J., Hayes, C., Huffman, P., Jiang, C., Kucuker, S., McCrea, M., Mueller, P. E., Penttilä, S. I., Snow, W. M., Tang, E., Tang, Z., Tong, X., and Wilburn, W. S.. 2018. "Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized 3He neutron spin-filter". United States. doi:10.1016/j.nima.2018.03.055. https://www.osti.gov/servlets/purl/1483524.
@article{osti_1483524,
title = {Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized 3He neutron spin-filter},
author = {Musgrave, M. M. and Baeßler, S. and Balascuta, S. and Barrón-Palos, L. and Blyth, D. and Bowman, J. D. and Chupp, T. E. and Cianciolo, V. and Crawford, C. and Craycraft, K. and Fomin, N. and Fry, J. and Gericke, M. and Gillis, R. C. and Grammer, K. and Greene, G. L. and Hamblen, J. and Hayes, C. and Huffman, P. and Jiang, C. and Kucuker, S. and McCrea, M. and Mueller, P. E. and Penttilä, S. I. and Snow, W. M. and Tang, E. and Tang, Z. and Tong, X. and Wilburn, W. S.},
abstractNote = {Accurately measuring the neutron beam polarization of a high flux, large area neutron beam is necessary for many neutron physics experiments. The Fundamental Neutron Physics Beamline (FnPB) at the Spallation Neutron Source (SNS) is a pulsed neutron beam that was polarized with a supermirror polarizer for the NPDGamma experiment. The polarized neutron beam had a flux of ~109 neutrons per second per cm2 and a cross sectional area of 10 x 12 cm2. The polarization of this neutron beam and the efficiency of a RF neutron spin rotator installed downstream on this beam were measured by neutron transmission through a polarized 3He neutron spin-filter. The pulsed nature of the SNS enabled us to employ an absolute measurement technique for both quantities which does not depend on accurate knowledge of the phase space of the neutron beam or the 3He polarization in the spin filter and is therefore of interest for any experiments on slow neutron beams from pulsed neutron sources which require knowledge of the absolute value of the neutron polarization. The polarization and spin-reversal efficiency measured were done for the NPDGamma experiment, which measures the parity violating γ-ray angular distribution asymmetry with respect to the neutron spin direction in the capture of polarized neutrons on protons. Finally, the experimental technique, results, systematic effects, and applications to neutron capture targets are discussed.},
doi = {10.1016/j.nima.2018.03.055},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 895,
place = {United States},
year = {2018},
month = {3}
}