15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

10.38 Ab Initio Response Functions for Cherenkov-based Neutron Detectors

18 Apr 2018, 10:30
2h 31m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

David Schlossberg (Lawrence Livermore National Laboratory) Bart Beeman (Lawrence Livermore National Laboratory) Mark Eckart (Lawrence Livermore National Laboratory) Gary Grim (Lawrence Livermore National Laboratory) Edward Hartouni (Lawrence Livermore National Laboratory) Robert Hatarik (Lawrence Livermore National Laboratory) Alastair Moore (Lawrence Livermore National Laboratory) Michael Rubery (Atomic Weapons Establishment) Daniel Sayre (Lawrence Livermore National Laboratory) Cory Waltz (Lawrence Livermore National Laboratory)

Description

Neutron time-of-flight (nToF) diagnostics at the NIF were recently outfitted with novel Cherenkov detectors. A quartz radiator delivers sub-nanosecond response time and is optically coupled to a MCP-PMT with gain ~1 to 10^4. Capitalizing on its fast response time, its sensitivity to gamma particles, and customized digitization, these systems provide better than 50 ps precision in measured moments of neutron distribution functions. An effort is underway to generate ab initio instrument response functions (IRF) to support the <1% uncertainty needed to resolve these moments. A combination of Monte Carlo modeling, benchtop characterization, and in-situ comparison is employed. Close agreement is shown between modeled IRFs and in-situ measurements using the NIF’s 10-ps pulse capability. Calculated 1st and 2nd moments from DT neutron spectra agree well with established scintillator measurements, and show reduced dependence on IRFs. Next steps for optimized design and modeling will be discussed. Work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory, under contract DE-AC52-07NA27344. IM release: LLNL-ABS-744408

Primary author

David Schlossberg (Lawrence Livermore National Laboratory)

Co-authors

Bart Beeman (Lawrence Livermore National Laboratory) Mark Eckart (Lawrence Livermore National Laboratory) Gary Grim (Lawrence Livermore National Laboratory) Edward Hartouni (Lawrence Livermore National Laboratory) Robert Hatarik (Lawrence Livermore National Laboratory) Alastair Moore (Lawrence Livermore National Laboratory) Michael Rubery (Atomic Weapons Establishment) Daniel Sayre (Lawrence Livermore National Laboratory) Cory Waltz (Lawrence Livermore National Laboratory)

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