Ab initio response functions for Cherenkov-based neutron detectors

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.

doi:10.1063/1.5039399

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

Journal Article · Tue Oct 16 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5039399· OSTI ID:1545519

^[1]; Moore, A. S. ^[1]; Beeman, B. V. ^[1]; Eckart, M. J. ^[1]; Grim, G. P. ^[1];

^[1]; Hatarik, R. ^[1]; Rubery, M. S. ^[2]; Sayre, D. B. ^[1]; Waltz, C. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); UK Ministry of Defense; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1545519

Alternate ID(s):: OSTI ID: 1477812; OSTI ID: 1755810

Report Number(s):: LLNL-JRNL-750691

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; Conference: 22.Topical Conference on High Temperature Plasma Diagnostics, San Diego, CA (United States), 16-19 Apr 2018; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Cited By (3)

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) Hartouni, E. P.; Beeman, B.; Eckart, M. J. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038816	journal	October 2018
A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited) Moore, A. S.; Schlossberg, D. J.; Hartouni, E. P. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039322	journal	October 2018
Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas Frenje, J. A. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab5137	journal	January 2020

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