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Optimization of the gamma reaction history diagnostic for double-shell pusher areal density and reaction history measurements on the National Ignition Facility.
Dwyer, R H; Meaney, K D; Geppert-Kleinrath, H; Loomis, E N; Robey, H F; Mohamed, Z L; Fry, C; Kim, Y.
Afiliación
  • Dwyer RH; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627, USA.
  • Meaney KD; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Geppert-Kleinrath H; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Loomis EN; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Robey HF; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Mohamed ZL; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Fry C; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Kim Y; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Rev Sci Instrum ; 95(3)2024 Mar 01.
Article en En | MEDLINE | ID: mdl-38497838
ABSTRACT
The double-shell inertial confinement fusion campaign, which consists of an aluminum ablator, a foam cushion, a high-Z pusher (tungsten or molybdenum), and liquid deuterium-tritium (DT) fuel, aims for its first DT filled implosions on the National Ignition Facility (NIF) in 2024. The high-Z, high density pusher does not allow x-rays to escape the double-shell capsule. Therefore, nuclear diagnostics such as the Gamma Reaction History (GRH) diagnostic on the NIF are crucial for understanding high-Z implosion performance. To optimize the GRH measurement of fusion reaction history and the pusher's areal density, the MCNP6.3-based forward model of the detector was built. When calculating the neutron-induced inelastic gamma ray production, the interaction of neutrons with the compressed fuel was additionally included. By folding the calculated gamma ray spectrum output and the previously calibrated GRH detector responses, the optimum set of GRH energy thresholds for measuring the pusher areal density is determined to be 2.9 and 6.3 MeV for DT double-shell experiments. In addition, the effect of the down-scattering of neutrons on the gamma ray spectrum, the minimum required yield for measurements, and the attenuation of the gamma rays through the pusher are analyzed.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rev Sci Instrum Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rev Sci Instrum Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos