Author Affiliations
Abstract
1 Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China
2 Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
3 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
We present an application of short-pulse laser-generated hard x rays for the diagnosis of indirectly driven double shell targets. Cone-inserted double shell targets were imploded through an indirect drive approach on the upgraded SG-II laser facility. Then, based on the point-projection hard x-ray radiography technique, time-resolved radiography of the double shell targets, including that of their near-peak compression, were obtained. The backlighter source was created by the interactions of a high-intensity short pulsed laser with a metal microwire target. Images of the target near peak compression were obtained with an Au microwire. In addition, radiation hydrodynamic simulations were performed, and the target evolution obtained agrees well with the experimental results. Using the radiographic images, areal densities of the targets were evaluated.
Matter and Radiation at Extremes
2024, 9(2): 027602
Author Affiliations
Abstract
1 Institute of Precision Optical Engineering, MOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Curved crystal imaging is an important means of plasma diagnosis. Due to the short wavelengths of high-energy X rays and the fixed lattice constant of the spherical crystal, it is difficult to apply the spherical crystal in high-energy X-ray imaging. In this study, we have developed a high-energy, high-resolution X-ray imager based on a toroidal crystal that can effectively correct astigmatism. We prepared a Ge toroidal crystal for backlighting Mo Kα1 characteristic lines ( keV) and verified its high-resolution imaging ability in high-energy X-ray region, achieving a spatial resolution of 5–10 µm in a field of view larger than 1.0 mm.
laser plasma diagnostics toroidal crystal monochromatic X-ray imaging Chinese Optics Letters
2023, 21(10): 103401
强激光与粒子束
2022, 34(12): 122005
1 中国工程物理研究院 激光聚变研究中心 等离子体物理重点实验室,四川 绵阳 621900
2 北京大学 物理学院,北京 100871
为了在百kJ高功率激光装置上建立D3He质子照相平台,采用一维辐射流体程序Helios-CR对D3He爆推靶质子产生进行了模拟,综合考虑多种因素给出在百千焦高功率激光装置上开展质子照相所需要的激光和靶球建议参数。结合激光装置现有条件,分析了在1015 W/cm2左右激光强度下D3He质子产额随靶球半径、激光强度、充气压力和SiO2球壳厚度等参数的变化规律,给出了靶球半径300 μm,内充D3He气体压强1.8 MPa,SiO2球壳厚度3.5 μm左右等优化参数,预计此条件下D3He质子产额可达109~1010。通过模拟得到的质子产额变化规律,为质子照相平台的正式建立和实验参数选取提供了参考。
直接驱动 爆推靶 单色质子源 direct drive implosion exploding pusher target monochromatic proton source 强激光与粒子束
2022, 34(12): 122003
强激光与粒子束
2022, 34(12): 122001
中国工程物理研究院 激光聚变研究中心 等离子体物理重点实验室,四川 绵阳 621900
提出了一种基于混合像素探测器作为记录介质的用于激光聚变内爆D3He质子源能谱和产额测量的在线磁谱仪诊断系统。通过对探测器上特征团簇数目和能量的识别,结合诊断系统排布,可以快速获取激光聚变反应产生的D3He质子源的能谱和产额。在神光装置上对该诊断系统进行了测试。实验使用31束纳秒激光聚焦到靶丸上驱动聚变反应。靶丸内充有原子比1∶1的D2和3He的混合气体。在线磁谱仪诊断系统测量到了中心能量在14.6 MeV、半高全宽为2.1 MeV、产额约(2.3±0.13)×109的初级D3He质子能谱。该系统的建立可以实时给出D3He质子源能谱和产额信息,从而更加及时地指导实验的开展。
激光聚变 内爆 质子能谱 在线诊断 laser fusion implosion proton spectrum online diagnosis 强激光与粒子束
2022, 34(5): 052001
1 中国工程物理研究院 激光聚变研究中心, 等离子体重点实验室,四川 绵阳 621999
2 西南科技大学 极端条件物质特性联合实验室,四川 绵阳 621010
3 北京应用物理与计算数学研究所,北京 100088
动理学效应的研究是近年来激光惯性约束聚变领域的研究热点,有助于理解实验结果和传统流体模拟之间的偏差。间接驱动黑腔中等离子体的温度、密度跨越多个量级且靶丸组分复杂,在局域的高温低密度区域,粒子的非平衡效应开始变得显著,可能会间接影响内爆性能。对ICF领域动理学效应的概念和部分进展做了简要综述。
激光聚变 动理学效应 非平衡 laser fusion kinetic effect thermal non-equilibrium 强激光与粒子束
2021, 33(1): 012004
强激光与粒子束
2020, 32(8): 082001
强激光与粒子束
2020, 32(9): 092007
中国工程物理研究院激光聚变研究中心等离子体物理重点实验室, 四川 绵阳 621900
基于皮秒拍瓦激光产生的高能X射线源具有强度高、脉宽短、焦点小的特点,利用这种X射线源发展出来的高时空分辨率X射线点投影背光照相是强加载条件下材料动态响应,以及惯性约束聚变等高能量密度物理研究中亟需的重要诊断技术。目前,研究人员主要依靠TITAN、OMEGA-EP和神光Ⅱ升级等大型皮秒拍瓦激光装置,对皮秒拍瓦激光与固体靶相互作用产生的X射线的能谱、转换效率、分辨率等关键参数进行了研究,发展了点投影背光照相技术,并开展了动态演示实验,成功获得了惯性约束聚变内爆过程和冲击加载材料微喷过程的演示图像。
激光光学 皮秒拍瓦激光 高时空分辨率 X射线 背光照相