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Application of Silicon Photomultipliers to Compton-scattering-type Polarimeters for Gamma Ray Bursts

机译：硅光电倍增管在伽马射线暴康普顿散射型旋光仪中的应用

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Gamma-ray bursts (GRBs) are the most energetic phenomena in the universe. To elucidate the radiation mechanism of GRBs, we are developing a Compton-scattering-type polarimeter using a plastic scintillator and CsI(Tl) scintillator attached to a silicon photomultiplier (SiPM). We constructed a small test model and investigated the basic performance. Moreover, irradiating the SiPM with protons, the radiation hardness has been also investigated. From these experiments, we have recognized that the Compton-scattering-type polarimeter will obtain the sensitivity to the energy above approximately 30 keV if the radiation damage to the SiPM is not serious. On the other hand, the dark current of the SiPM becomes several thousand times higher for a few krad of irradiation and can be accumulated in the space environment in a few years. This means that the polarimeter will work well in balloon-borne experiments for a few weeks.
机译：伽马射线爆发（GRB）是宇宙中最活跃的现象。为了阐明GRB的辐射机理，我们正在开发使用塑料闪烁体和连接到硅光电倍增管（SiPM）的CsI（Tl）闪烁体的康普顿散射型旋光仪。我们构建了一个小型测试模型，并研究了基本性能。此外，还用质子辐照SiPM，还研究了辐照硬度。从这些实验中，我们已经认识到，如果对SiPM的辐射损伤不严重，则康普顿散射型旋光仪将获得对大约30 keV以上能量的灵敏度。另一方面，对于几krad的辐射，SiPM的暗电流变得高出数千倍，并且可以在几年内累积在空间环境中。这意味着旋光仪在气球载实验中可以正常工作数周。

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