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Title: Ab initio response functions for Cherenkov-based neutron detectors

Abstract

Neutron time-of-flight diagnostics at the NIF were of late outfitted with Cherenkov detectors. A fused silica radiator delivers sub-nanosecond response time and is optically coupled to a microchannel plate photomultiplier tube with gain from ~1 to 104. Capitalizing on fast time response and gamma-ray sensitivity, these systems can provide better than 30 ps precision for measuring first moments of neutron distributions. Generation of ab initio instrument response functions (IRFs) is critical to meet the <1% uncertainty needed. A combination of Monte Carlo modeling, benchtop characterization, and in situ comparison is employed. Close agreement is shown between the modeled IRFs and in situ measurements using the NIF’s short-pulse advanced radiographic capability beams. First and second moments of neutron spectra calculated using ab initio IRFs agree well with established scintillator measurements. Next-step designs offer increased sensitivity and time-response.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [2];  [1];  [1]
+ Show Author Affiliations
  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 Defense; USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1545519
Alternate Identifier(s):
OSTI ID: 1477812; OSTI ID: 1755810
Report Number(s):
LLNL-JRNL-750691
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22.Topical Conference on High Temperature Plasma Diagnostics, San Diego, CA (United States), 16-19 Apr 2018; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 97 MATHEMATICS AND COMPUTING; Cherenkov radiation; Monte Carlo methods; Gamma ray instruments; Cherenkov detectors; Neutron scattering; Lasers; Neutron spectra; Neutron detectors; Nuclear fusion; Gamma rays; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Schlossberg, D. J., Moore, A. S., Beeman, B. V., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., Rubery, M. S., Sayre, D. B., and Waltz, C. Ab initio response functions for Cherenkov-based neutron detectors. United States: N. p., 2018. Web. doi:10.1063/1.5039399.
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Schlossberg, D. J., Moore, A. S., Beeman, B. V., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., Rubery, M. S., Sayre, D. B., & Waltz, C. Ab initio response functions for Cherenkov-based neutron detectors. United States. https://doi.org/10.1063/1.5039399
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Schlossberg, D. J., Moore, A. S., Beeman, B. V., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., Rubery, M. S., Sayre, D. B., and Waltz, C. Tue . "Ab initio response functions for Cherenkov-based neutron detectors". United States. https://doi.org/10.1063/1.5039399. https://www.osti.gov/servlets/purl/1545519.
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@article{osti_1545519,
title = {Ab initio response functions for Cherenkov-based neutron detectors},
author = {Schlossberg, D. J. and Moore, A. S. and Beeman, B. V. and Eckart, M. J. and Grim, G. P. and Hartouni, E. P. and Hatarik, R. and Rubery, M. S. and Sayre, D. B. and Waltz, C.},
abstractNote = {Neutron time-of-flight diagnostics at the NIF were of late outfitted with Cherenkov detectors. A fused silica radiator delivers sub-nanosecond response time and is optically coupled to a microchannel plate photomultiplier tube with gain from ~1 to 104. Capitalizing on fast time response and gamma-ray sensitivity, these systems can provide better than 30 ps precision for measuring first moments of neutron distributions. Generation of ab initio instrument response functions (IRFs) is critical to meet the <1% uncertainty needed. A combination of Monte Carlo modeling, benchtop characterization, and in situ comparison is employed. Close agreement is shown between the modeled IRFs and in situ measurements using the NIF’s short-pulse advanced radiographic capability beams. First and second moments of neutron spectra calculated using ab initio IRFs agree well with established scintillator measurements. Next-step designs offer increased sensitivity and time-response.},
doi = {10.1063/1.5039399},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Tue Oct 16 00:00:00 EDT 2018},
month = {Tue Oct 16 00:00:00 EDT 2018}
}
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https://doi.org/10.1063/1.5039399
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    Works referencing / citing this record:

    Uncertainty analysis of response functions and γ-backgrounds on T ion and t 0 measurements from Cherenkov neutron detectors at the National Ignition Facility (NIF)
    journal, October 2018

    • Hartouni, E. P.; Beeman, B.; Eckart, M. J.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5038816

    A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)
    journal, October 2018

    • Moore, A. S.; Schlossberg, D. J.; Hartouni, E. P.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5039322

    Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas
    journal, January 2020

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