论文标题
GEANT4溴化葡萄闪烁体检测器的Geant4建模
Geant4 Modeling of a Cerium Bromide Scintillator Detector for the IMPRESS CubeSat Mission
论文作者
论文摘要
太阳耀斑是太阳系中一些最有活力的事件，可以研究以研究等离子体和恒星过程的物理。太阳耀斑的一个有趣的方面是存在加速（非热）颗粒，其签名出现在太阳耀斑硬X射线排放中。自空间年龄初期以来，辩论一直在持续进行这些粒子的加速度加速，而探测相关加速机制的一种方法是研究太阳能弹力X射线X射线液体中的短期变化（数十毫秒）的变化。冲动相的快速能量太阳能光谱仪（印象）立方体任务旨在测量这些快速的X射线变化。为了从此任务中产生最佳的科学数据，我们使用Geant4 Monte Carlo模型来表征印象深刻的闪烁体检测器。我们表明，Geant4蒙特卡洛检测器模型与分析模型一致。我们发现X射线和光学相互作用的GEANT4模拟解释了实验数据中观察到的特征，但并不能完全解释我们测得的能量分辨率。我们进一步表明，在662 kev $^{137} $ cs photopopeak上，非均匀的光收集导致双峰行为，并且可以在Geant4型号中进行纠正，并且可能在实验室中进行纠正。
Solar flares are some of the most energetic events in the solar system and can be studied to investigate the physics of plasmas and stellar processes. One interesting aspect of solar flares is the presence of accelerated (nonthermal) particles, whose signatures appear in solar flare hard X-ray emissions. Debate has been ongoing since the early days of the space age as to how these particles are accelerated, and one way to probe relevant acceleration mechanisms is by investigating short-timescale (tens of milliseconds) variations in solar flare hard X-ray flux. The Impulsive Phase Rapid Energetic Solar Spectrometer (IMPRESS) CubeSat mission aims to measure these fast hard X-ray variations. In order to produce the best possible science data from this mission, we characterize the IMPRESS scintillator detectors using Geant4 Monte Carlo models. We show that the Geant4 Monte Carlo detector model is consistent with an analytical model. We find that Geant4 simulations of X-ray and optical interactions explain observed features in experimental data, but do not completely account for our measured energy resolution. We further show that nonuniform light collection leads to double-peak behavior at the 662 keV $^{137}$Cs photopeak and can be corrected in Geant4 models and likely in the lab.
