Mixing with applications to inertial-confinement-fusion implosions

Rana, V.; Lim, H.; Melvin, J.; Glimm, J.; Cheng, B.; Sharp, D. H.

doi:10.1103/PhysRevE.95.013203

Title: Mixing with applications to inertial-confinement-fusion implosions

Journal Article · Mon Jan 09 00:00:00 EST 2017 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.95.013203· OSTI ID:1458923

Rana, V. ^[1]; Lim, H. ^[1]; Melvin, J. ^[1]; Glimm, J. ^[1];

^[2]; Sharp, D. H. ^[2]

Stony Brook Univ., NY (United States). Dept. of Applied Mathematics and Statistics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Approximate one-dimensional (1D) as well as 2D and 3D simulations are playing an important supporting role in the design and analysis of future experiments at National Ignition Facility. This work is mainly concerned with 1D simulations, used extensively in design and optimization. We couple a 1D buoyancy-drag mix model for the mixing zone edges with a 1D inertial confinement fusion simulation code. This analysis predicts that National Ignition Campaign (NIC) designs are located close to a performance cliff, so modeling errors, design features (fill tube and tent) and additional, unmodeled instabilities could lead to significant levels of mix. The performance cliff we identify is associated with multimode plastic ablator (CH) mix into the hot-spot deuterium and tritium (DT). The buoyancy-drag mix model is mode number independent and selects implicitly a range of maximum growth modes. Our main conclusion is that single effect instabilities are predicted not to lead to hot-spot mix, while combined mode mixing effects are predicted to affect hot-spot thermodynamics and possibly hot-spot mix. Combined with the stagnation Rayleigh-Taylor instability, we find the potential for mix effects in combination with the ice-to-gas DT boundary, numerical effects of Eulerian species CH concentration diffusion, and ablation-driven instabilities. With the help of a convenient package of plasma transport parameters developed here, we give an approximate determination of these quantities in the regime relevant to the NIC experiments, while ruling out a variety of mix possibilities. Plasma transport parameters affect the 1D buoyancy-drag mix model primarily through its phenomenological drag coefficient as well as the 1D hydro model to which the buoyancy-drag equation is coupled.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; JL3K00 NYSB0000; AC02005CH11231

OSTI ID:: 1458923

Alternate ID(s):: OSTI ID: 1338645

Report Number(s):: LA-UR-16-20021; PLEEE8; TRN: US1901523

Journal Information:: Physical Review E, Vol. 95, Issue 1; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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