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Title: Signal and background considerations for the MRSt on the National Ignition Facility (NIF)

A Magnetic Recoil Spectrometer (MRSt) has been conceptually designed for time-resolved measurements of the neutron spectrum at the National Ignition Facility. Using the MRSt, the goals are to measure the time-evolution of the spectrum with a time resolution of ~20-ps and absolute accuracy better than 5%. To meet these goals, a detailed understanding and optimization of the signal and background characteristics are required. Through ion-optics, MCNP simulations, and detector-response calculations, we demonstrate that the goals and a signal-to background >5-10 for the down-scattered neutron measurement are met if the background, consisting of ambient neutrons and gammas, at the MRSt is reduced 50-100 times.
Authors:
 [1] ; ORCiD logo [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [2] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-737362
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:
AC52-07NA27344; NA0002949; NA0001857
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21. Topical Conference on High Temperature Plasma Diagnostics (HTPD 2016), Madison, WI (United States), 5-9 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Neutrons; Protons; secondary-electrons (SE); 42 ENGINEERING
OSTI Identifier:
1285121
Alternate Identifier(s):
OSTI ID: 1389981

Wink, C. W., Frenje, J. A., Hilsabeck, T. J., Bionta, R., Khater, H. Y., Gatu Johnson, M., Kilkenny, J. D., Li, C. K., Séguin, F. H., and Petrasso, R. D.. Signal and background considerations for the MRSt on the National Ignition Facility (NIF). United States: N. p., Web. doi:10.1063/1.4958938.
Wink, C. W., Frenje, J. A., Hilsabeck, T. J., Bionta, R., Khater, H. Y., Gatu Johnson, M., Kilkenny, J. D., Li, C. K., Séguin, F. H., & Petrasso, R. D.. Signal and background considerations for the MRSt on the National Ignition Facility (NIF). United States. doi:10.1063/1.4958938.
Wink, C. W., Frenje, J. A., Hilsabeck, T. J., Bionta, R., Khater, H. Y., Gatu Johnson, M., Kilkenny, J. D., Li, C. K., Séguin, F. H., and Petrasso, R. D.. 2016. "Signal and background considerations for the MRSt on the National Ignition Facility (NIF)". United States. doi:10.1063/1.4958938. https://www.osti.gov/servlets/purl/1285121.
@article{osti_1285121,
title = {Signal and background considerations for the MRSt on the National Ignition Facility (NIF)},
author = {Wink, C. W. and Frenje, J. A. and Hilsabeck, T. J. and Bionta, R. and Khater, H. Y. and Gatu Johnson, M. and Kilkenny, J. D. and Li, C. K. and Séguin, F. H. and Petrasso, R. D.},
abstractNote = {A Magnetic Recoil Spectrometer (MRSt) has been conceptually designed for time-resolved measurements of the neutron spectrum at the National Ignition Facility. Using the MRSt, the goals are to measure the time-evolution of the spectrum with a time resolution of ~20-ps and absolute accuracy better than 5%. To meet these goals, a detailed understanding and optimization of the signal and background characteristics are required. Through ion-optics, MCNP simulations, and detector-response calculations, we demonstrate that the goals and a signal-to background >5-10 for the down-scattered neutron measurement are met if the background, consisting of ambient neutrons and gammas, at the MRSt is reduced 50-100 times.},
doi = {10.1063/1.4958938},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {8}
}