5～88 keV能区硬X光能谱精密测量  

Measurement of hard X-ray spectrum at 5-88 keV

作　　者：李朝光[1] 何小安[1] 张文海[1] 苏明[1] 易荣清[1] 李三伟[1] 江少恩[1] 丁永坤[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2014年第11期95-98,共4页High Power Laser and Particle Beams

基　　金：国家重大专项

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.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.

关 键 词：硬X光 滤波荧光 超热电子 能谱 

分 类 号：O434.12[机械工程—光学工程] O536[理学—光学]