Journal
PHYSICS OF PLASMAS
Volume 27, Issue 12, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0023541
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Funding
- U.S. DOE FES Grant [DE-SC0014318, DE-SC0020229]
- U.S. NASA [80NSSC18K0772]
- U.S. NNSA Award [DE-NA0003856, DE-NA0003914]
- U.S. DOE [DE-SC0019329]
- National Natural Science Foundation of China (NSFC) [11975056]
- Science Challenge Project (SCP) [TZ2016005]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA25050400]
- NSFC [11772324, 11621202]
- SCP [TZ2016001]
- National Energy Research Scientific Computing Center (NERSC) [DE-AC02-05CH11231]
- agency of the U.S. Government
- U.S. Department of Energy (DOE) [DE-SC0020229, DE-SC0019329] Funding Source: U.S. Department of Energy (DOE)
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The self-similar nonlinear evolution of the multimode ablative Rayleigh-Taylor instability (RTI) and the ablation-generated vorticity effect are studied for a range of initial conditions. We show that, unlike classical RTI, the nonlinear multimode bubble-front evolution remains in the bubble competition regime due to ablation-generated vorticity, which accelerates the bubbles, thereby preventing a transition into the bubble-merger regime. We develop an analytical bubble competition model to describe the linear and nonlinear stages of ablative RTI. We show that vorticity inside the multimode bubbles is most significant at small scales with large initial perturbation. Since these small scales persist in the bubble competition regime, the self-similar growth coefficient alpha (b) can be enhanced by up to 30% relative to ablative bubble competition without vorticity effects. We use the ablative bubble competition model to explain the hydrodynamic stability boundary observed in OMEGA low-adiabat implosion experiments.
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