平面调制靶瑞利-泰勒不稳定性初步研究  

Preliminary experimental study of Rayleigh-Taylor instability of surface perturbation target

作　　者：袁永腾[1] 缪文勇[1] 丁永坤[1] 鄢扬[2] 赵宗清[1] 刘慎业[1] 刘忠礼[1] 张继彦[1] 黄翼翔[1] 杨国洪[1] 张海鹰[1] 曹柱荣[1] 胡昕[1] 于燕宁[1] 张文海[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]电子科技大学物理电子学院,成都610054

出　　处：《强激光与粒子束》2007年第5期781-784,共4页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题

摘　　要：瑞利-泰勒不稳定性增长的准确估计是激光聚变的重要研究课题。在神光Ⅱ装置上,利用面向背光照相技术对正弦调制平面靶的瑞利-泰勒不稳定性增长进行了实验研究,得到了清晰的时空分辨图像;采用傅里叶变换取基模法和求波峰波谷差值法分析了实验结果;两种方法得到的靶扰动增长因子相同。实验中平面靶扰动增长较小可能是密度梯度致稳和烧蚀致稳抑制了扰动增长,也可能是扰动进入了非线性阶段而使增长不大。An accurate evaluation of the growth rate of the Rayleigh-Taylor（RT）instability is a critical issue for inertial confinement fusion. This paper uses the face-on radiography technology to investigate the Rayleigh-Taylor instability of sine modulated surface target at the Shengguang Ⅱ facility and gains vivid space and time resolution images. The experimental results are analyzed by two methods, i. e. , figuring out fundamental mode Fourier coefficient and figuring ,out the D-value of wave crest and wave hollow. The two methods obtain the same perturbation growth factor. Moreover, this paper presents possible reasons for the little growth with a qualitative interpretation, i. e. , the density gradient stabilization and ablative stabilization suppress the perturbation growth, or the perturbation turns into the non linear stage, which causes the little growth.

关 键 词：Rayleigh—Taylor不稳定性 面向背光照相 平面调制靶 

分 类 号：O534[理学—等离子体物理]