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摘要

辐射冲击波波后物质具有辐射属性, 它通过扰动界面引起的Richtmyer-Meshkov(RM)不稳定性的增长有别于通常的冲击波. 在高功率激光装置上开展冲击波波后辐射效应对界面不稳定性增长影响的实验研究, 认识波后辐射对界面增长的影响过程及规律, 有助于提高高能量密度条件下RM不稳定性演化规律的认识水平及预测能力. 基于神光III原型高功率激光装置, 设计并开展了两种激光驱动条件下的界面流体力学不稳定性实验, 研究波后辐射效应对界面RM不稳定性增长的影响. 实验中在较高功率密度驱动条件下CHBr扰动样品未见明显的扰动增长, 结合模拟分析发现较高功率密度条件下辐射前驱波波阵面和冲击波波阵面明显分离, 辐射前驱波在冲击波到达扰动界面前烧蚀扰动界面, 改变了界面的初始状态, 界面不稳定性增长过程中密度梯度的增大和界面Atwood数的减小抑制了界面RM不稳定性的增长.

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Abstract

Radiative shocks are ubiquitous in stellar environments and are characterized by high temperature plasma emitting a considerable fraction of their energy as radiation. Radiative shocks occur commonly in nature, especially in astronomical systems and inertial confinement fusion. The study of the effects of radiation on Richtmyer-Meshkov (RM) instability will improve our ability to understand and predict the evolution of RM instability under high energy density conditions. A few experiments have been performed to compare the radiative case with the non-radiative case in Rayleigh-Taylor (RT) instability, thereby studying how the radiative effects change the evolution of RT instability, but the interplay between RM instability and radiative shock has been studied rarely. This paper reports mainly the role of radiation in the changing of the RM instability. Two experiments are performed at Shenguang III prototype laser facility, the RM instability growth data are obtained by varying the laser intensity. The laser intensity for high-drive experiment is approximately 60% greater than that for low-drive experiment. The target consists of a multiple layer in the axial direction, in which the first layer is a 15μm-thick CH sample serving as an ablator, followed by a 10 μm-thick aluminum used as a shield layer to prevent the preheat effect. The next layer is a 350-μm-thick SiO ₂foam, which is used as a material to produce a radiative shock. The last layer is the CH perturbed sample. There is a sinusoidal perturbation on the surface of CH sample which is adjacent to the SiO ₂foam. The target is irradiated by four overlapping laser beams, and the laser beams produce a large pressure that drives a shock wave, whose velocity can be changed by varying the laser intensity, into the target package. In the experiments, shock-generated radiative fluxes first ablate the unstable interface which the shock has not passed through, then the shock transmits the unstable interface to produce the RM instability. The images of unstable interface are captured using side-on x-ray radiography, and the experimental results show that the RM growth is suppressed in the experiment for the higher laser intensity. Radiation hydrodynamic code Multi1D is used to evaluate the electron temperature, shock velocity, and electron density. The simulations show that the foam temperature in the high-drive case can reach 80 eV in the front of shock, this energy flows away from the shock front, generating a radiative precursor ahead of the shock. The radiative precursor velocity of 270 km/s is much larger than the shock velocity of 170 km/s, the radiative precursor arrives at the unstable interface before the shock and ablates the unstable interface, so the radiative flux changes the initial conditions of unstable interface. When the shock propagates through the unstable interface, the ablation increases the density gradient length scale and reduces the Atwood number of the unstable interface, so the RM growth is suppressed in the high-drive case because of the ablation of the radiative precursor.

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作者及机构信息

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通信作者:缪文勇,miaowenyong@sina.com

基金项目:国家自然科学基金 (批准号: 11705179, 11905205) 和科学挑战计划 (批准号: TZ2016005)资助的课题

Authors and contacts

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Corresponding author:Miao Wen-Yong,miaowenyong@sina.com

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11705179, 11905205) and the Science Challenge Project, China (Grant No. TZ2016005)

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参考文献

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施引文献

下载: 全尺寸图片幻灯片

发次号	记录图像时刻/ns	设计能量/J	实际输出能量/J	实际输出能量与设计能量偏差/%
057	5	2000	1931	–3.45
056	6	2000	1983	–0.85
054	8	2000	1988	–0.60

下载: 导出CSV

发次号	记录图像时刻/ns	设计能量/J	实际输出能量/J	实际输出能量与设计能量偏差/%
061	5	3200	3080	–3.75
055	8	3200	2812	–12.1

下载: 导出CSV

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