强激光与粒子束, 2013, 25 (7): 1719, 网络出版: 2020-12-16   

五通道Z箍缩等离子体K壳层线谱成像

Five-channel K-shell line emission imaging of Z-pinch plasmas
作者单位
1 中国工程物理研究院 流体物理研究所, 四川 绵阳 621900
2 重庆大学 光电技术及系统教育部重点实验室, 重庆 400044
摘要
采用5个针孔配接5块对数螺线晶体单色器方案,研制了一台五通道靶室内置式X射线单色成像器,并利用该成像器在阳加速器上成功获取了铝丝阵负载Z箍缩内爆等离子体的K壳层自辐射五通道单色线谱图像。该成像器结构紧凑,安装调节简便精准,能谱分辨力高(小于1.3 eV),能够清楚分辨Al的类氦主共振线(1 598.4 eV)和互组合线(1 588.3 eV),以及类氢主共振线(1729 eV)及其伴线(1 727.7 eV)光谱图像。由于阳加速器驱动能力有限,这些图像均由若干的离散热斑组成,并且大都集中在柱状等离子体轴线上,说明这些热斑附近的电子温度和密度较周围要高; 类氦主共振线较类氢主共振线图像强度高、热斑区域大,反映了Z箍缩等离子体温度不够高,原子被激发到类氢离子的数量远少于类氦离子。
Abstract
A five-channel, in-chamber, X-ray imager employing five pinholes and five logarithmic spiral crystals is developed to obtain five monochromatic K-shell line images of the Al wire array Z-pinch plasmas on the “Yang” accelerator in one shot. This imager is compact, and easy to install and align. It has high energy resolution (less than 1.3 eV), and thus can easily distinguish the images of the He-like resonance line (1 598.4 eV) and its inter-combination line (1 588.3 eV), and the H-like resonance line (1 727.7 eV) and its inter-combination line (1729 eV) of Al from each other. Limited by the drive capability of the “Yang” accelerator, these images are constructed by several discrete hot-spots distributed around the axial line of the plasmas with cylindrical shape, where the temperature and density of electrons are higher than other regions. In addition, the intensity is higher and the area of hot-spots is wider for the He-like line images than for the H-like line images, which indicates that the electron temperature is not high enough so that the number of H-like ions is far less than that of He-like ions.

阳庆国, 周少彤, 毋玉芬, 黄显宾, 肖沙里. 五通道Z箍缩等离子体K壳层线谱成像[J]. 强激光与粒子束, 2013, 25(7): 1719. Yang Qingguo, Zhou Shaotong, Wu Yufen, Huang Xianbin, Xiao Shali. Five-channel K-shell line emission imaging of Z-pinch plasmas[J]. High Power Laser and Particle Beams, 2013, 25(7): 1719.

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