Inferring fusion nuclear burnwidths with low gain photomultiplier impulse response functions

Meaney, Kevin Daniel; Jeet, Justin; Carrera, J.; Mariscal, E.; Schlossberg, D.; Moore, A.; Eckart, M.; Milnes, J.; Hink, P.; Hillyard, Patrick W.; Holdener, D.; Herrmann, H.; Geppert-Kleinrath, Hermann; Kim, Yong Ho

doi:10.1063/5.0213471

Title: Inferring fusion nuclear burnwidths with low gain photomultiplier impulse response functions

Journal Article · 01 December 2024 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/5.0213471 · OSTI ID:2500894

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Photek Ltd. (United Kingdom)
Nevada National Security Site (NNSS), Livermore, CA (United States)

When an inertial confinement fusion implosion is compressed, it maintains thermonuclear density and temperatures for a very short time scale, about 100 ps. The Gamma Reaction History diagnostic measures the time evolution of the fusion burn, but its temporal resolution is limited by the use of a photomultiplier tube (PMT) to amplify the photon signal. Multichannel plate-based PMTs have a fast (~120 ps) full-width at half-max impulse response function (IRF), but the time scale is similar to the incoming physics signal. An analysis routine is used to remove the effect of the PMT IRF and infer the incident fusion burnwidth. With the National Ignition Facility achieving ignition and creating much brighter signals, the PMTs are run at gains three orders of magnitude lower than nominal operation. Calibration at these settings shows the PMT IRFs get ~15% wider. Taking the gain-dependent IRF can affect the inferred nuclear burnwidths by up to ~15%.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2500894

Report Number(s):: LA-UR--24-23103

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 12 Vol. 95; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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