Radiation and heat transport in divergent shock–bubble interactions
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- University of Rochester, NY (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Brigham Young University, Provo, UT (United States)
- University of Rochester, NY (United States)
Shock–bubble interactions (SBIs) are important across a wide range of physical systems. In inertial confinement fusion, interactions between laser-driven shocks and micro-voids in both ablators and foam targets generate instabilities that are a major obstacle in achieving ignition. Experiments imaging the collapse of such voids at high energy densities (HED) are constrained by spatial and temporal resolution, making simulations a vital tool in understanding these systems. In this study, we benchmark several radiation and thermal transport models in the xRAGE hydrodynamic code against experimental images of a collapsing mesoscale void during the passage of a 300 GPa shock. We also quantitatively examine the role of transport physics in the evolution of the SBI. This allows us to understand the dynamics of the interaction at timescales shorter than experimental imaging framerates. We find that all radiation models examined reproduce empirical shock velocities within experimental error. Radiation transport is found to reduce shock pressures by providing an additional energy pathway in the ablation region, but this effect is small (~1% of total shock pressure). Employing a flux-limited Spitzer model for heat conduction, we find that flux limiters between 0.03 and 0.10 produce agreement with experimental velocities, suggesting that the system is well-within the Spitzer regime. Higher heat conduction is found to lower temperatures in the ablated plasma and to prevent secondary shocks at the ablation front, resulting in weaker primary shocks. Lastly, we confirm that the SBI-driven instabilities observed in the HED regime are baroclinically driven, as in the low energy case.
- Research Organization:
- Univ. of Rochester, NY (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- NA0003856; NA0003914; NA0004134; AC02-76SF00515; SC0020229; SC0019329; NSF PHY-2020249; OCE-2123496; PHY-2206380; 89233218CNA000001; 80NSSC18K0772; PHY-2020249
- OSTI ID:
- 2320254
- Alternate ID(s):
- OSTI ID: 2323535
- Report Number(s):
- LA-UR-23-31881
- Journal Information:
- Physics of Plasmas, Vol. 31, Issue 3; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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