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Title: A method for in situ absolute DD yield calibration of neutron time-of-flight detectors on OMEGA using CR-39-based proton detectors

Abstract

Neutron time of flight (nTOF) detectors are used routinely to measure the absolute DD neutron yield at OMEGA. To check the DD yield calibration of these detectors, originally calibrated using indium activation systems, which in turn were cross-calibrated to NOVA nTOF detectors in the early 1990s, a direct in situ calibration method using CR-39 range filter proton detectors has been successfully developed. By measuring DD neutron and proton yields from a series of exploding pusher implosions at OMEGA, a yield calibration coefficient of 1.09 ± 0.02 (relative to the previous coefficient) was determined for the 3m nTOF detector. In addition, comparison of these and other shots indicates that significant reduction in charged particle flux anisotropies is achieved when bang time occurs significantly (on the order of 500 ps) after the trailing edge of the laser pulse. This is an important observation as the main source of the yield calibration error is due to particle anisotropies caused by field effects. The results indicate that the CR-39-nTOF in situ calibration method can serve as a valuable technique for calibrating and reducing the uncertainty in the DD absolute yield calibration of nTOF detector systems on OMEGA, the National Ignition Facility, and laser megajoule.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2]
+ Show Author Affiliations
  1. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States).
  2. Lab. for Laser Energetics, Rochester, NY (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1182631
Grant/Contract Number:  
NA0001857; NA0002035
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 5; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Waugh, C. J., Rosenberg, M. J., Zylstra, A. B., Frenje, J. A., Seguin, F. H., Petrasso, R. D., Glebov, V. Yu., Sangster, T. C., and Stoeckl, C. A method for in situ absolute DD yield calibration of neutron time-of-flight detectors on OMEGA using CR-39-based proton detectors. United States: N. p., 2015. Web. doi:10.1063/1.4919290.
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Waugh, C. J., Rosenberg, M. J., Zylstra, A. B., Frenje, J. A., Seguin, F. H., Petrasso, R. D., Glebov, V. Yu., Sangster, T. C., & Stoeckl, C. A method for in situ absolute DD yield calibration of neutron time-of-flight detectors on OMEGA using CR-39-based proton detectors. United States. https://doi.org/10.1063/1.4919290
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Waugh, C. J., Rosenberg, M. J., Zylstra, A. B., Frenje, J. A., Seguin, F. H., Petrasso, R. D., Glebov, V. Yu., Sangster, T. C., and Stoeckl, C. Wed . "A method for in situ absolute DD yield calibration of neutron time-of-flight detectors on OMEGA using CR-39-based proton detectors". United States. https://doi.org/10.1063/1.4919290. https://www.osti.gov/servlets/purl/1182631.
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@article{osti_1182631,
title = {A method for in situ absolute DD yield calibration of neutron time-of-flight detectors on OMEGA using CR-39-based proton detectors},
author = {Waugh, C. J. and Rosenberg, M. J. and Zylstra, A. B. and Frenje, J. A. and Seguin, F. H. and Petrasso, R. D. and Glebov, V. Yu. and Sangster, T. C. and Stoeckl, C.},
abstractNote = {Neutron time of flight (nTOF) detectors are used routinely to measure the absolute DD neutron yield at OMEGA. To check the DD yield calibration of these detectors, originally calibrated using indium activation systems, which in turn were cross-calibrated to NOVA nTOF detectors in the early 1990s, a direct in situ calibration method using CR-39 range filter proton detectors has been successfully developed. By measuring DD neutron and proton yields from a series of exploding pusher implosions at OMEGA, a yield calibration coefficient of 1.09 ± 0.02 (relative to the previous coefficient) was determined for the 3m nTOF detector. In addition, comparison of these and other shots indicates that significant reduction in charged particle flux anisotropies is achieved when bang time occurs significantly (on the order of 500 ps) after the trailing edge of the laser pulse. This is an important observation as the main source of the yield calibration error is due to particle anisotropies caused by field effects. The results indicate that the CR-39-nTOF in situ calibration method can serve as a valuable technique for calibrating and reducing the uncertainty in the DD absolute yield calibration of nTOF detector systems on OMEGA, the National Ignition Facility, and laser megajoule.},
doi = {10.1063/1.4919290},
journal = {Review of Scientific Instruments},
number = 5,
volume = 86,
place = {United States},
year = {Wed May 27 00:00:00 EDT 2015},
month = {Wed May 27 00:00:00 EDT 2015}
}
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https://doi.org/10.1063/1.4919290
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