Improvement of the modulation factor for a Compton scattering type polarimeter using subdivided scintillators
Improvement of the modulation factor for a Compton scattering type polarimeter using subdivided scintillators
复制标题
使用细分闪烁体改进康普顿散射型旋光计的调制因子
DOI：
10.1109/nssmic.1997.672656
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
H. Sakurai
中科院分区：
文献类型：
--
作者：
Shuichi Gunji;E. Kudo;H. Sakurai
我们正在研制一种康普顿散射型偏振计，用塑料散射器作散射体，用NaI（Tl）散射器作散射X射线探测器。为了提高调制因子，同时保持良好的探测效率，我们通过基本实验和计算机模拟研究了细分塑料和NaI（Tl）晶体对调制因子和探测效率的影响。通过细分测量散射和吸收的x和y点，精度为1.4cm，调制因子可达38%，保持探测效率为36%。由于两个位置都以7 mm的精度检测，因此这种类型的偏振计将获得45%的调制因子。通过这种改进，旋光计的性能比原设计提高了一倍左右。
We are developing a Compton scattering type polarimeter, using plastic scintillators as scatterers and NaI(Tl) scintillators as detectors of scattered X rays. To improve the modulation factor keeping the good detection efficiency, we investigated the effect of subdivided plastic and NaI(Tl) scintillators for the modulation factor and the detection efficiency with basic tests and computer simulations. By measuring both x and y points of the scattering and the absorption with 1.4 cm accuracy by the subdivision, the modulation factor can go up to 38%, keeping the detection efficiency of 36%. As both positions are detected with 7 mm accuracy, this type of polarimeter will obtain modulation factor of 45%. By this improvement, the polarimeter call obtain about two times higher performance than that by the former design.