强激光与粒子束, 2014, 26 (11): 112007, 网络出版: 2014-12-08
5~88keV能区硬X光能谱精密测量
Measurement of hard X-ray spectrum at 588 keV
摘要
利用滤波荧光(FF)法建立了5~88 keV能区硬X光能谱测量系统,对闪烁探测器的灵敏度进行了精密标定,不确定度好于10%。通过研究干扰产生的原因,改善系统屏蔽,有效地排除了干扰,提高了系统的信噪比;通过更换大电流的光电倍增管,改变准直光阑的尺寸和滤片的厚度,将测量系统的线性动态范围从4提高到104。在神光Ⅲ原型物理实验中定量给出Au平面靶硬X光谱,实现硬X光能谱的精密测量。
Abstract
Suprathermal electron is an important factor influencing ignition in inertial confine fusion. Measuring results of hard X-ray spectrum could get suprathermal electron temperature and suprathermal electron quantities. This project mainly built a system to measure hard X-ray spectrum in energy region of 5 keV to 88 keV utilizing filter-fluorescer method. The system accurately calibrated its scintillator’s sensitivity with an uncertainty of less than 10%. System signal-to-noise ratio was increased by shielding the interference from system insides and environment of measurement. System output linearity was enhanced from 4 to 104 by replacing a photo-multiple-tube which could stand bigger current and changing the size of aperture or filter’s thickness. Finally, the system succeeded in measuring a precise hard X-ray spectrum of Au-plane target in SG-Ⅲ prototype.
李朝光, 何小安, 张文海, 苏明, 易荣清, 李三伟, 江少恩, 丁永坤. 5~88keV能区硬X光能谱精密测量[J]. 强激光与粒子束, 2014, 26(11): 112007. Li Chaoguang, He Xiaoan, Zhang Wenhai, Su Ming, Yi Rongqing, Li Sanwei, Jiang Shaoen, Ding Yongkun. Measurement of hard X-ray spectrum at 588 keV[J]. High Power Laser and Particle Beams, 2014, 26(11): 112007.