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Title: A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)

Abstract

A fused silica Cherenkov radiator has been utilized at the National Ignition Facility to provide a new high precision measurement of the time-of-flight spectrum of 14.1 MeV DT fusion neutrons. This detector allows a high precision (<30 ps) co-registered measurement of both a thresholded γ-ray and a neutron spectrum on a single record. Other approaches typically require γ and neutron signals to be co-registered via other diagnostics and/or dedicated timing experiments. Analysis of the co-registered γ and neutron signals allows precise extraction of the mean neutron energy and bulk hot-spot velocity, both of which were not possible with prior scintillator technologies. Initial measurements demonstrate the feasibility of this measurement and indicate that combined detection of neutrons and γ-rays on multiple lines-of-sight should enable the bulk vector velocity of the implosion hot-spot to be determined to ≈5 km/s and reduced uncertainty in the spectral width ≈0.1 keV.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); UK Ministry of Defence
OSTI Identifier:
1545509
Alternate Identifier(s):
OSTI ID: 1476838
Grant/Contract Number:  
AC52-07 nA273444
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Proceedings of the Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA (United States), Apr 2018; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Moore, Alastair S., Schlossberg, D. J., Hartouni, E. P., Sayre, D., Eckart, M. J., Hatarik, R., Barbosa, F., Root, J., Waltz, C., Beeman, B., Rubery, M. S., and Grim, G. P. A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited). United States: N. p., 2018. Web. doi:10.1063/1.5039322.
Moore, Alastair S., Schlossberg, D. J., Hartouni, E. P., Sayre, D., Eckart, M. J., Hatarik, R., Barbosa, F., Root, J., Waltz, C., Beeman, B., Rubery, M. S., & Grim, G. P. A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited). United States. doi:10.1063/1.5039322.
Moore, Alastair S., Schlossberg, D. J., Hartouni, E. P., Sayre, D., Eckart, M. J., Hatarik, R., Barbosa, F., Root, J., Waltz, C., Beeman, B., Rubery, M. S., and Grim, G. P. Tue . "A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)". United States. doi:10.1063/1.5039322. https://www.osti.gov/servlets/purl/1545509.
@article{osti_1545509,
title = {A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)},
author = {Moore, Alastair S. and Schlossberg, D. J. and Hartouni, E. P. and Sayre, D. and Eckart, M. J. and Hatarik, R. and Barbosa, F. and Root, J. and Waltz, C. and Beeman, B. and Rubery, M. S. and Grim, G. P.},
abstractNote = {A fused silica Cherenkov radiator has been utilized at the National Ignition Facility to provide a new high precision measurement of the time-of-flight spectrum of 14.1 MeV DT fusion neutrons. This detector allows a high precision (<30 ps) co-registered measurement of both a thresholded γ-ray and a neutron spectrum on a single record. Other approaches typically require γ and neutron signals to be co-registered via other diagnostics and/or dedicated timing experiments. Analysis of the co-registered γ and neutron signals allows precise extraction of the mean neutron energy and bulk hot-spot velocity, both of which were not possible with prior scintillator technologies. Initial measurements demonstrate the feasibility of this measurement and indicate that combined detection of neutrons and γ-rays on multiple lines-of-sight should enable the bulk vector velocity of the implosion hot-spot to be determined to ≈5 km/s and reduced uncertainty in the spectral width ≈0.1 keV.},
doi = {10.1063/1.5039322},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
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