辐射热波图像平整度实验研究  

Experimental research on planarity of thermal wave burn-through images

作　　者：王哲斌[1] 邓博[1] 张惠鸽[1] 胡昕[1] 李三伟[1] 章欢[1] 朱托[1] 杨家敏[1] 李志超[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12期3131-3134,共4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：理论计算了诊断系统空间分辨对辐射热波烧穿图像平整度的影响,发现它会显著降低图像平整度。优化了三色谱仪诊断系统空间分辨并在神光Ⅱ装置上开展了验证性实验,结果表明420eV能区29μm空间分辨设置下测量到的热波图像平整区域有了明显改进,热波前沿涨落不超过4.7ps,远小于X光条纹相机约20ps的测量不确定度。在此改进下,热波烧穿图像平整度已经不是影响数据分析可靠性的主要因素。In the field of laser fusion, the ablation rate of target material is mainly measured by the diagnostic of thermal wave burn-through images. The planarity of such images could make great influences on the uncertainty of ablation rate. The im provement of the image planarity has been made based on the theoretical and experimental study of the influence of diagnostical spatial resolution. After optimizing the spatial resolution to 29 /,m on the 420 eV channel of the diagnostic, we proved with SG-II experiment that the planarity area of thermal wave burn through image has been increased largely and the fluctuation of thermal wave front is only 4.7 ps which is much less than the temporal measurement uncertainty （about 20 ps） of X-ray streak camera.

关 键 词：激光聚变 辐射热波 烧蚀速率 平整度 

分 类 号：O536[理学—等离子体物理] O532.13[理学—物理]