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