THESEUS上的X-伽马成像光谱仪（XGIS）
The X-Gamma Imaging Spectrometer (XGIS) onboard THESEUS
摘要：
设计了一个紧凑和模块化的X射线和伽马射线成像光谱仪，作为响应欧空局M5号召而提出的THESEUS飞行任务中预见的机载仪器之一。该实验设想使用CsI闪烁棒读出两端的单细胞25毫米2硅漂移探测器。使用板上电子器件区分硅层中吸收的事件（较低能量X射线）和闪烁体晶体中吸收的事件（较高能量X射线和伽马射线）。编码掩模在低能量下提供成像能力，从而允许在宽能带（~ 2keV至~20 MeV）中的紧凑且灵敏的仪器。仪器的设计，预期的性能和表征进行了一系列的实验室原型进行了讨论。
英文摘要：
A compact and modular X and gamma-ray imaging spectrometer (XGIS) has been designed as one of the instruments foreseen on-board the THESEUS mission proposed in response to the ESA M5 call. The experiment envisages the use of CsI scintillator bars read out at both ends by single-cell 25 mm 2 Silicon Drift Detectors. Events absorbed in the Silicon layer (lower energy X rays) and events absorbed in the scintillator crystal (higher energy X rays and Gamma-rays) are discriminated using the on-board electronics. A coded mask provides imaging capabilities at low energies, thus allowing a compact and sensitive instrument in a wide energy band (~2 keV up to ~20 MeV). The instrument design, expected performance and the characterization performed on a series of laboratory prototypes are discussed.
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