Forward Modeling of Gamma Reaction History Signatures From Anticipated Deuterium-Tritium Filled MagLIF Implosions on Sandia’s Z-Machine

Dwyer, Robert H.; Yates, Kevin C.; Meaney, Kevin D.; Fry, C.; Morrow, Tana; Mangan, Michael; Kim, Yongho

doi:10.1109/tps.2024.3441369

Forward Modeling of Gamma Reaction History Signatures From Anticipated Deuterium-Tritium Filled MagLIF Implosions on Sandia’s Z-Machine

Journal Article · Fri Aug 23 00:00:00 EDT 2024 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/tps.2024.3441369· OSTI ID:2477792

^[1]; ^[2]; Meaney, Kevin D. ^[3]; Fry, C. ^[3]; Morrow, Tana ^[3]; Mangan, Michael ^[2]; Kim, Yongho ^[3]

Univ. of Rochester, NY (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Nuclear reaction history measurements provide a bang time and burn width of Inertial Confinement Fusion (ICF) implosions and are essential for understanding implosion performance to constrain ICF capsule design. When fusion fuel contains Deuterium (D) and Tritium (T) gas, reaction history is informed by measuring the 16.75 MeV gamma rays generated from the D(T,γ)⁵He reaction. Such DT based reaction history measurements have not been made on the Magnetized Laser Inertial Fusion (MagLIF) platform on Sandia’s Z-Machine due to the lack of Tritium being used. The recent development of ICF implosions with tritiated fuel will open the possibility of measuring the gamma reaction history on the Z-Machine. A forward model of the Gamma Reaction History diagnostic on Z (GRH-Z) has been developed using the MCNP6.3 (Monte-Carlo N-Particle) radiation transport code. The model included the Z-Machine geometry of interest to characterize the impact of neutron induced gamma rays on the DT reaction history measurements. In addition, the impulse response functions of the GRH-Z diagnostic to understand the temporal response of the detector, and the minimum yields required to make a reaction history measurement were calculated. This approach also predicted that with T₂ gas doping of MagLIF implosions a reaction history may be made for high performance shots >8e12-2.4e13 depending on the chosen threshold for the detector, with a maximum signal to background ratio of 25%. It was found that for long duration ICF implosions that additional collimation will be needed to prevent the neutron induced gamma rays from modifying the shape of the measured DT reaction history curve.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

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

Grant/Contract Number:: 89233218CNA000001; NA0003525

OSTI ID:: 2477792

Report Number(s):: LA-UR--23-30687

Journal Information:: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 10 Vol. 52; ISSN 0093-3813

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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