Characterization of SiPM and Development of Test Bench Modules for the Next-Generation Cameras for Large-Sized Telescopes for Cherenkov Telescope Array

Takayuki Saito, Kazuki Abe，Hiroyasu Tajima,Tokonatsu Yamamoto

International Conference on Rebooting Computing（2023）

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Abstract

The recent improvements in the performance of the silicon photomultipliers (SiPMs) made them attractive options as photo sensors of imaging atmospheric Cherenkov telescopes (IACTs). In fact, they are already adopted in some IACTs such as FACT and the Small-Sized Telescopes of the Cherenkov Telescope Array (CTA). However, the application to the Large-Sized Telescopes (LSTs) of CTA requires additional studies. As the pixel size of LSTs is larger than the nominal size of SiPMs, the signal from multiple sensors must be summed up. Also, the high detection efficiency of the night sky background (NSB) photons may degrade the telescope performance. To overcome this, the pulse width must be as small as 3 ns and the detection efficiency for NSB photons must be suppressed as much as possible. Heat generation and gain stabilization are also issues. We studied different types of SiPMs from Hamamatsu photonics and characterized them for the LST application, addressing the previous points. Also, to prove the SiPM performance in LST, we are developing a SiPM module which can be installed in the exisiting LST camera. Here we present the results of this evaluation and the status of the test bench module development.

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Key words

Silicon Photomultiplier,Scintillation Detectors

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【要点】：本文研究了Hamamatsu公司生产的硅光电倍增管（SiPMs）特性，并开发测试平台模块，以满足大型大气切伦科夫望远镜（LSTs）对高性能光电传感器的需求，解决了信号整合、夜晚天空背景光子检测效率及热生成与增益稳定性的问题。

【方法】：作者通过对比分析不同类型的SiPMs，针对LST应用需求进行了特性评估。

【实验】：实验对SiPMs进行了性能评估，并开发了适用于现有LST相机的SiPM模块，文章呈现了评估结果和测试平台模块开发状态，但未提及具体的数据集名称。

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