摘要
利用一套罗斯滤片系统测量激光轰击固体金属Ti平面靶产生的X射线辐射通量,系统包括两个相同的X射线探测器及相应滤膜.罗斯滤片法的优点在于利用相邻核素对X射线相似的阻止率,可滤出一个窄的能带并去除高能部分的干扰,获得了Ti平面靶K壳层X光辐射产额.实验结果表明：硬X射线能段在4.5～4.9 keV之间的K壳特征辐射占优,连续谱所占份额较低（与晶体谱仪一致）;随着激光能量的增加,特征辐射增加;激光强度接近2×10^15 W/cm^2时,能量转换效率出现峰值.
Flux of X-ray produced from focussing laser radiation onto solid target was measured using a Ross filter system.The system consists of two identical X-ray detectors,appropriate filters mounted ahead of each detector.Ross filter method uses the advantages of the X-ray nuclide adjacent similar rejection,can filter out a narrow-band interference and remove high-energy part of the plane to get the Ti target K-shell X-ray radiation yield.Experiment result shows that k-shell emission of 4.5-4.9 keV prevails over continuum spectra （coincidence with result from crystal spectrometer）.Characteristic emission increases with increased laser energy and a peak in conversion efficiency appears near 2× 10^15 W/cm^2.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第11期68-71,共4页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11135007
11305155)
关键词
罗斯滤片
X射线
能量转换效率
Ross filter
X-ray
energy conversion efficiency
