Si Fenni, Zhang Chuanfei, Xu Rongkun, Yuan Xi, Huang Zhanchang, Xu Zeping, Ye Fan, Yang Jianlun, Ning Jiamin, Hu Qingyuan, Zhu Xuebin
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Sichuan, Mianyang 621900, People's Republic of China.
Rev Sci Instrum. 2015 Aug;86(8):083507. doi: 10.1063/1.4928746.
High energy photons are measured for the first time in wire-array Z-pinch experiments on the Primary Test Stand (PTS) which delivers a current up to 8 MA with a rise time of 70 ns. A special designed detecting system composed of three types of detectors is used to measure the average energy, intensity, and pulse waveform of high energy photons. Results from Pb-TLD (thermoluminescence dosimeter) detector indicate that the average energy is 480 keV (±15%). Pulse shape of high energy photons is measured by the photodiode detector consisted of scintillator coupled with a photodiode, and it is correlated with soft x-ray power by the same timing signal. Intensity is measured by both TLD and the photodiode detector, showing good accordance with each other, and it is 10(10) cm(-2) (±20%) at 2 m in the horizontal direction. Measurement results show that high energy photons are mainly produced in pinch regions due to accelerated electrons. PTS itself also produces high energy photons due to power flow electrons, which is one order smaller in amplitude than those from pinch region.
在初级试验台（PTS）的丝阵Z箍缩实验中首次测量到了高能光子，该试验台能产生高达8兆安的电流，上升时间为70纳秒。一个由三种探测器组成的特殊设计的探测系统被用于测量高能光子的平均能量、强度和脉冲波形。铅热释光剂量计（Pb-TLD）探测器的结果表明平均能量为480千电子伏（±15%）。高能光子的脉冲形状由与光电二极管耦合的闪烁体组成的光电二极管探测器测量，并且它通过相同的定时信号与软X射线功率相关。强度由TLD和光电二极管探测器测量，两者显示出良好的一致性，在水平方向2米处强度为10(10)厘米(-2)（±20%）。测量结果表明，高能光子主要是由箍缩区域中加速的电子产生的。PTS自身由于功率流电子也会产生高能光子，其幅度比来自箍缩区域的光子小一个数量级。
