Nonlinear bubble competition of the multimode ablative Rayleigh–Taylor instability and applications to inertial confinement fusion

Zhang, Huasen; Betti, R.; Yan, Rui; Aluie, Hussein

doi:10.1063/5.0023541

Title: Nonlinear bubble competition of the multimode ablative Rayleigh–Taylor instability and applications to inertial confinement fusion

Journal Article · Wed Dec 09 00:00:00 EST 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0023541· OSTI ID:1749944

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Univ. of Rochester, NY (United States); Inst. of Applied Physics and Computational Mathematics, Beijing (China)
Univ. of Rochester, NY (United States)
Univ. of Science and Technology of China, Hefei (China); Shanghai Jiao Tong Univ. (China)

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 α_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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Research Organization:: Univ. of Rochester, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Aeronautics and Space Administration (NASA); National Natural Science Foundation of China (NSFC); USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: Laboratory for Laser Energetics, University of Rochester

Grant/Contract Number:: SC0014318; SC0020229; 80NSSC18K0772; SC0019329; 11975056; NA0003856; NA0003914; XDA25050400

OSTI ID:: 1749944

Alternate ID(s):: OSTI ID: 1735770; OSTI ID: 1762157; OSTI ID: 1778861

Report Number(s):: 2020-94; 1609; 2562; TRN: US2205446

Journal Information:: Physics of Plasmas, Vol. 27, Issue 12; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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