辐射驱动冲击波速度被动式测量  

Passive measurement of radiation driven shock velocity

作　　者：王哲斌[1] 蒋小华[1] 李三伟[1] 张惠鸽[1] 况龙钰[1] 王传珂[1] 刘永刚[1] 于瑞珍[1] 彭晓世[1] 杨冬[1] 章欢[1] 李志超[1] 张继彦[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

出　　处：《强激光与粒子束》2013年第2期375-380,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11005097);中国工程物理研究院科学技术发展基金项目(2010A0102003)

摘　　要：在神光Ⅱ和神光Ⅲ原型装置上采用了辐射驱动冲击波速度被动式测量技术,对冲击波发光图像信噪比进行了理论分析和实验研究,结果表明:靶室内杂散光比冲击波信号至少强4个量级以上,是影响信噪比的关键因素。据此提出了信噪比控制技术,通过电磁屏蔽优化,采用了基于光触发的快时间分辨测量技术,提高了冲击波速度测量精度。基于冲击波测量辐射温度,对辐射驱动冲击波速度被动式测量技术进行了考核。实验测量的冲击波发光图像清晰,数据信噪比及冲击波速度和物理预期一致,验证了技术的可靠性。The passive diagnostic for radiation driven shock velocity is of critical importance in the research of radiation driv en fusion and extreme high-pressure equation of state. Such diagnostic has been set up on SG-Ⅱ and the laser prototype facility. The coutrol technique of signal-to-noise of shock breakout images has been developed based on the theoretical analysis and experi mental study which shows that the stray light such as stimulated scattering light is 4 order stronger than the shock light. The pre- cise temporal resolved technique has also been developed based on the successful application of the faster sweep rate of the streak camera with aids of high-quality light triggering instead of traditional electronic triggering. The developed passive diagnostic has been validated successfully by an experiment whose results show the shock image is clear and the deduced shock velocity is con sistent with the calculated one.

关 键 词：激光聚变 冲击波发光图像 冲击波速度测量 光学条纹相机 

分 类 号：O536[理学—等离子体物理] O532.13[理学—物理]