Improved inertial confinement fusion gamma reaction history 12C gamma-ray signal by direct subtraction

Meaney, Kevin Daniel; Kim, Yong Ho; Herrmann, Hans W.; Geppert-Kleinrath, Hermann; Hoffman, Nelson M.

doi:10.1063/1.5092501

Improved inertial confinement fusion gamma reaction history ¹²C gamma-ray signal by direct subtraction

Journal Article · Thu Nov 07 00:00:00 EST 2019 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5092501· OSTI ID:1574754

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The Gamma Reaction History Diagnostic (GRH) located at the National Ignition Facility (NIF) measures time resolved gamma rays released from inertial confinement fusion experiments by converting emitted gamma rays into Cherenkov light. Imploded capsules have a bright 4.4 MeV gamma ray from fusion neutrons inelastically scattering with carbon atoms in the remaining ablator. The strength of 4.4 MeV gamma ray line is proportional to the capsule’s carbon ablator areal density and can be used to understand the dynamics and energy budget of a carbon-based ablator capsule implosion. Historically, the GRH’s four gas cells use the energy thresholding from the Cherenkov process to forward fit an estimation of the experiment’s complete gamma ray spectrum by modeling the surrounding environment in order to estimate the 4.4 MeV neutron induced carbon gamma ray signal. However, the high number of variables, local minima and uncertainties in detector sensitivities and relative timing had prevented routine use of the forward fit to generate carbon areal density measurements. A new, more straightforward, process of direct subtraction of deconvolved signals was developed to simplify the extraction of the carbon areal density. Beryllium capsules are used as a calibration to measure a capsule environment with no carbon signal. This is then used to appropriately subtract and isolate the carbon signal on shots with carbon ablators. The subtraction algorithm achieves good results across all major capsule campaigns, achieving similar results to the forward fit. This method is now used routinely to measure carbon areal density for NIF shots.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1574754

Alternate ID(s):: OSTI ID: 1573424

Report Number(s):: LA-UR--19-21506

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 90; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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