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Title: Yield degradation mechanisms for two-shock capsules evaluated through simulations

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/5.0098496· OSTI ID:1897427
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  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  3. General Atomics, San Diego, CA (United States)

An investigation of twenty two-shock campaign indirectly driven capsules on the National Ignition Facility was conducted using the xRAGE computer code. The two-shock platform was developed to look at the sensitivity of fuel–ablator mix with shock timing, asymmetry, surface roughness, and convergence on roughly ignition size scale capsules. This platform used CH/CD (plastic/deuterated plastic) shell capsules that were about 685- μm outer radius and filled with D2 or hydrogen-tritium (HT) gas. The experimental radius and velocity vs time, neutron yield, burn averaged ion temperature (Tion), burn width, and self-emission image size were compared to one-dimensional (1D) and two-dimensional (2D) simulations. Our 2D simulations suggest that the mixing of glass from the fill tube was the dominant source of impurity in the gas region of the capsule during burn, along with fuel–ablator mix. The mass of glass mixed in is about 5–10 ng. Our 2D simulations capture most of the yield trends from different degradation mechanisms, and they match the observed burn width and Tion measurements. Our 2D models match all the available data to within 2.5 times the normalized experimental error for 19 of 20 capsules.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA). Office of Defense Programs (DP); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; 89233218NCA00000; AC52-07NA27344
OSTI ID:
1897427
Alternate ID(s):
OSTI ID: 1895165; OSTI ID: 1959504
Report Number(s):
LA-UR-21-28010; LLNL-JRNL-834001; TRN: US2310786
Journal Information:
Physics of Plasmas, Vol. 29, Issue 10; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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