Growth of ablative Rayleigh-Taylor instability induced by time-varying heat-flux perturbationOA
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.
Yang Liu;De-Hua Zhang;Jing-Fei Xin;Yudong Pu;Jun Li;Tao Tao;Dejun Sun;Rui Yan;Jian Zheng;
Department of Modern Mechanics,University of Science and Technology of China,Hefei 230026,China Deep Space Exploration Laboratory,Hefei 230026,ChinaDepartment of Modern Mechanics,University of Science and Technology of China,Hefei 230026,ChinaLaser Fusion Research Center,China Academy of Engineering Physics,Mianyang 621900,ChinaInstitute of Applied Physics and Computational Mathematics,Beijing 100094,ChinaDepartment of Plasma Physics and Fusion Engineering,University of Science and Technology of China,Hefei,Anhui 230026,ChinaDepartment of Modern Mechanics,University of Science and Technology of China,Hefei 230026,China Collaborative Innovation Center of IFSA(CICIFSA),Shanghai Jiao Tong University,Shanghai 200240,ChinaDepartment of Plasma Physics and Fusion Engineering,University of Science and Technology of China,Hefei,Anhui 230026,China Collaborative Innovation Center of IFSA(CICIFSA),Shanghai Jiao Tong University,Shanghai 200240,China CAS Center for Excellence in Ultra-intense Laser Science,Shanghai 201800,China
核科学
perturbationstationaryacceleration
《Matter and Radiation at Extremes》 2024 (001)
P.85-93 / 9
supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDA25050400 and XDA25010200);the National Natural Science Foundation of China(Grant No.12175229 and 12388101);the Frontier Scientific Research Program of the Deep Space Exploration Laboratory(Grant No.2022-QYKYJH-HXYF-019);by the Fundamental Research Funds for the Central Universities.
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