强光一号Z箍缩产生keV级特征X射线初步研究

Primary study on production of keV level characteristic X-radiation via high power Z-pinch on Qiangguang-Ⅰ generator

分析了高功率Z箍缩产生keV级特征X射线辐射的物理机理和用于计算等离子体K层辐射二能级模型,给出了采用二能级模型进行数值模拟的结果,描述了强光一号装置驱动Z箍缩负载的脉冲功率源特性参数,介绍了所设计研制的双层喷Ne气和双层铝丝阵两类Z箍缩负载的结构与参数,并对下一步拟开展的实验研究工作进行了说明。利用特制真空X射线二极管测量了强光一号双层喷氖气Z箍缩实验产生的X射线波形,实验结果表明,当气室内初始气压在0.8 MPa时,喷Ne气Z箍缩可获得较好的keV量级的X射线辐射。

The physical mechanism for producing keV level X-radiation via high power Z-pinch and a two-level model for K-shell radiation scaling of the imploding Z-pinch plasma were investigated, and the results of the numerical simulation by the twolevel model were given in detail. The performance parameters of Qiangguang-Ⅰ generator for driving Z-pinch loads, the configuration and parameters of double-shell neon gas puff load and aluminum wire array were described, and the experimental arrangement was introduced. The waveform of X-ray measured by special X-ray diode for Qiangguang-Ⅰ with neondoubte gas puff indicated that a good result of keV level characteristic X radiation could be obtained when the initial pressure of neon is 0.8 MPa.