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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第11期95-98,共4页
High Power Laser and Particle Beams
基金
国家重大专项
关键词
硬X光
滤波荧光
超热电子
能谱
hard X-ray
filter-fluorescer
suprathermal electron
spectrum
