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Title: Average neutron time-of-flight instrument response function inferred from single D-T neutron events within a plastic scintillator

The apparent ion temperature and neutron-reaction history are important characteristics of a fusion plasma. Extracting these quantities from a measured neutron-time-of-flight signal requires accurate knowledge of the instrument response function (IRF). This paper describes a novel method for obtaining the IRF directly for single DT neutron interactions by utilizing n-alpha coincidence. The t(d,α)n nuclear reaction was produced at Sandia National Laboratories’ Ion Beam Laboratory using a 300 keV Cockcroft-Walton generator to accelerate a 2.5 μA beam of 175 keV D + ions into a stationary ErT 2 target. The average neutron IRF was calculated by taking a time-corrected average of individual neutron events within an EJ-228 plastic scintillator. The scintillator was coupled to two independent photo-multiplier tubes operated in the current mode: a Hamamatsu 5946 mod-5 and a Photek PMT240. Finally, the experimental setup and results will be discussed.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [1] ;  [2] ; ORCiD logo [1] ;  [2] ;  [1]
  1. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Nuclear Engineering
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Report Number(s):
SAND2018-4843J
Journal ID: ISSN 0034-6748; 662799
Grant/Contract Number:
NA0003525
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1477868
Alternate Identifier(s):
OSTI ID: 1476840

Styron, J. D., Ruiz, C. L., Hahn, K. D., Cooper, G. W., Chandler, G. A., Jones, B., McWatters, B. R., Forrest, C. J., Vaughan, J., Torres, J., Pelka, S., Smith, J., and Weaver, C.. Average neutron time-of-flight instrument response function inferred from single D-T neutron events within a plastic scintillator. United States: N. p., Web. doi:10.1063/1.5038883.
Styron, J. D., Ruiz, C. L., Hahn, K. D., Cooper, G. W., Chandler, G. A., Jones, B., McWatters, B. R., Forrest, C. J., Vaughan, J., Torres, J., Pelka, S., Smith, J., & Weaver, C.. Average neutron time-of-flight instrument response function inferred from single D-T neutron events within a plastic scintillator. United States. doi:10.1063/1.5038883.
Styron, J. D., Ruiz, C. L., Hahn, K. D., Cooper, G. W., Chandler, G. A., Jones, B., McWatters, B. R., Forrest, C. J., Vaughan, J., Torres, J., Pelka, S., Smith, J., and Weaver, C.. 2018. "Average neutron time-of-flight instrument response function inferred from single D-T neutron events within a plastic scintillator". United States. doi:10.1063/1.5038883.
@article{osti_1477868,
title = {Average neutron time-of-flight instrument response function inferred from single D-T neutron events within a plastic scintillator},
author = {Styron, J. D. and Ruiz, C. L. and Hahn, K. D. and Cooper, G. W. and Chandler, G. A. and Jones, B. and McWatters, B. R. and Forrest, C. J. and Vaughan, J. and Torres, J. and Pelka, S. and Smith, J. and Weaver, C.},
abstractNote = {The apparent ion temperature and neutron-reaction history are important characteristics of a fusion plasma. Extracting these quantities from a measured neutron-time-of-flight signal requires accurate knowledge of the instrument response function (IRF). This paper describes a novel method for obtaining the IRF directly for single DT neutron interactions by utilizing n-alpha coincidence. The t(d,α)n nuclear reaction was produced at Sandia National Laboratories’ Ion Beam Laboratory using a 300 keV Cockcroft-Walton generator to accelerate a 2.5 μA beam of 175 keV D+ ions into a stationary ErT2 target. The average neutron IRF was calculated by taking a time-corrected average of individual neutron events within an EJ-228 plastic scintillator. The scintillator was coupled to two independent photo-multiplier tubes operated in the current mode: a Hamamatsu 5946 mod-5 and a Photek PMT240. Finally, the experimental setup and results will be discussed.},
doi = {10.1063/1.5038883},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

Works referenced in this record:

Measurement of the Time Dependence of Scintillation Intensity by a Delayed?Coincidence Method
journal, September 1961
  • Bollinger, L. M.; Thomas, G. E.
  • Review of Scientific Instruments, Vol. 32, Issue 9, p. 1044-1050
  • DOI: 10.1063/1.1717610