Growth of ablative Rayleigh-Taylor instability induced by time-varying heat-flux perturbation

Yang Liu; De-Hua Zhang; Jing-Fei Xin; Yudong Pu; Jun Li; Tao Tao; Dejun Sun; Rui Yan; Jian Zheng

doi:10.1063/5.0157344

Journals >Matter and Radiation at Extremes >Volume 9 >Issue 1 >Page 016603 > Article

Matter and Radiation at Extremes
Vol. 9, Issue 1, 016603 (2024)

Growth of ablative Rayleigh-Taylor instability induced by time-varying heat-flux perturbation

Yang Liu^1,2, De-Hua Zhang¹, Jing-Fei Xin¹, Yudong Pu³..., Jun Li⁴, Tao Tao⁵, Dejun Sun¹, Rui Yan^1,6,a) and Jian Zheng^5,6,7|Show fewer author(s)

Author Affiliations

¹Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China

²Deep Space Exploration Laboratory, Hefei 230026, China

³Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China

⁴Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

⁵Department of Plasma Physics and Fusion Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China

⁶Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China

⁷CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China

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DOI: 10.1063/5.0157344 Cite this Article

Yang Liu, De-Hua Zhang, Jing-Fei Xin, Yudong Pu, Jun Li, Tao Tao, Dejun Sun, Rui Yan, Jian Zheng. Growth of ablative Rayleigh-Taylor instability induced by time-varying heat-flux perturbation[J]. Matter and Radiation at Extremes, 2024, 9(1): 016603 Copy Citation Text

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Abstract

The evolution of ablative Rayleigh–Taylor instability (ARTI) induced by single-mode stationary and time-varying perturbations in heat flux is studied numerically in two dimensions. Compared with the stationary case, time-varying heat-flux perturbation mitigates ARTI growth because of the enhanced thermal smoothing induced by the wave-like traveling heat flux. A resonance is found to form when the phase velocity of the heat-flux perturbation matches the average sound speed in the ablation region. In the resonant regime, the coherent density and temperature fluctuations enhance the electron thermal conduction in the ablation region and lead to larger ablation pressure and effective acceleration, which consequently yield higher linear growth rate and saturated bubble velocity. The enhanced effective acceleration offers increased implosion velocity but can also compromise the integrity of inertial confinement fusion shells by causing faster ARTI growth.