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Development of the detector simulation framework for the Wideband Hybrid X-ray Imager onboard FORCE
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment ( IF 1.4 ) Pub Date : 2020-07-25 , DOI: 10.1016/j.nima.2020.164433
Hiromasa Suzuki , Tsubasa Tamba , Hirokazu Odaka , Aya Bamba , Kouichi Hagino , Ayaki Takeda , Koji Mori , Takahiro Hida , Masataka Yukumoto , Yusuke Nishioka , Takeshi G. Tsuru

FORCE is a Japan–US space-based astronomy mission for an X-ray imaging spectroscopy in an energy range of 1–80 keV. The Wideband Hybrid X-ray Imager (WHXI), which is the main focal plane detector, will use a hybrid semiconductor imager stack composed of silicon and cadmium telluride (CdTe). The silicon imager will be a certain type of the silicon-on-insulator (SOI) pixel sensor, named the X-ray pixel (XRPIX) series. Since the sensor has a small pixel size (30–36 μm) and a thick sensitive region (300–500 μm), understanding the detector response is not trivial and is important in order to optimize the camera design and to evaluate the scientific capabilities. We have developed a framework to simulate observations of celestial sources with semiconductor sensors. Our simulation framework was tested and validated by comparing our simulation results to laboratory measurements using the XRPIX 6H sensor. The simulator well reproduced the measurement results with reasonable physical parameters of the sensor including an electric field structure, a Coulomb repulsion effect on the carrier diffusion, and arrangement of the degraded regions. This framework is also applicable to future XRPIX updates including the one which will be part of the WHXI, as well as various types of semiconductor sensors.



中文翻译:

FORCE宽带混合X射线成像仪探测器仿真框架的开发

FORCE是日美天基天文学任务,其能量范围为1–80 keV的X射线成像光谱。宽带混合X射线成像仪(WHXI)是主要的焦平面探测器,将使用由硅和碲化镉(CdTe)组成的混合半导体成像仪堆栈。硅成像器将是某种类型的绝缘体上硅(SOI)像素传感器,称为X射线像素(XRPIX)系列。由于传感器的像素较小(30–36 μ)和较厚的敏感区域(300–500 μ),了解检测器的响应并非易事,对于优化相机设计和评估科学能力至关重要。我们已经开发了一个框架,可以模拟半导体传感器对天体的观测。通过将我们的模拟结果与使用XRPIX 6H传感器的实验室测量值进行比较,对我们的模拟框架进行了测试和验证。模拟器很好地再现了传感器的合理物理参数的测量结果,包括电场结构,对载流子扩散的库仑排斥效应以及退化区域的排列。该框架还适用于将来的XRPIX更新,包括将成为WHXI的更新以及各种类型的半导体传感器。

更新日期:2020-07-25
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