Pulse dilation gas Cherenkov detector for ultra-fast gamma reaction history at the NIF (invited)

Geppert-Kleinrath, H.; Herrmann, H. W.; Kim, Y. H.; Zylstra, A. B.; Meaney, K.; Lopez, F. E.; Pederson, B. J.; Carrera, J.; Khater, H.; Horsfield, C. J.; Rubery, M. S.; Gales, S.; Leatherland, A.; Meadowcroft, A.; Hilsabeck, T.; Kilkenny, J. D.; Malone, R. M.; Hares, J. D.; Dymoke-Bradshaw, A. K. L.; Milnes, J.; McFee, C.

doi:10.1063/1.5039377

Title: Pulse dilation gas Cherenkov detector for ultra-fast gamma reaction history at the NIF (invited)

Journal Article · Wed Oct 24 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5039377· OSTI ID:1877971

^[1]; Herrmann, H. W. ^[1]; Kim, Y. H. ^[1];

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^[1]; Lopez, F. E. ^[1]; Pederson, B. J. ^[1];

^[2]; Khater, H. ^[2]; Horsfield, C. J. ^[3]; Rubery, M. S. ^[3];

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^[3]; Meadowcroft, A. ^[3]; Hilsabeck, T. ^[4]; Kilkenny, J. D. ^[4];

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Atomic Weapons Establishment, Berkshire (United Kingdom)
General Atomics, San Diego, CA (United States)
Misson Support and Test Services, LLC, Los Alamos, NM (United States)
Kentech Instruments Ltd., Oxfordshire (United Kingdom)
Photeck Ltd., East Sussex (United Kingdom)
Sydor Technologies, Rochester, NY (United States)

The Cherenkov mechanism used in Gas Cherenkov Detectors (GCDs) is exceptionally fast. However, the temporal resolution of GCDs, such as the Gamma Reaction History diagnostic at the National Ignition Facility (NIF), has been limited by the current state-of-the-art photomultiplier tube technology to ~100 ps. The soon-to-be deployed Pulse Dilation Photomultiplier Tube (PD-PMT) at NIF will allow for temporal resolution comparable to that of the gas cell or ~10 ps. Enhanced resolution will contribute to the quest for ignition in a crucial way through precision measurements of reaction history and ablator areal density (ρR) history, leading to better constrained models. Features such as onset of alpha heating, shock reverberations, and burn truncation due to dynamically evolving failure modes may become visible for the first time. Test measurements of the PD-PMT at Atomic Weapons Establishment confirmed that design goals have been met. The PD-PMT provides dilation factors of 2 to 40× in 6 increments. Furthermore, the GCD-3 recently deployed at the NIF has been modified for coupling to a PD-PMT and will soon be making ultrafast measurements.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; AC52-06NA25396

OSTI ID:: 1877971

Alternate ID(s):: OSTI ID: 1480045; OSTI ID: 1889521

Report Number(s):: LLNL-JRNL-836663; LLNL-JRNL-837614; LA-UR-18-23981; 1055444; TRN: US2307447

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 10 works

Citation information provided by
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Cited By (3)

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
Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility Herrmann, H. W.; Kim, Y. H.; Zylstra, A. B. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039378	journal	October 2018
Improved inertial confinement fusion gamma reaction history ¹² C gamma-ray signal by direct subtraction Meaney, K. D.; Kim, Y. H.; Herrmann, H. W. Review of Scientific Instruments, Vol. 90, Issue 11 https://doi.org/10.1063/1.5092501	journal	November 2019

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