Liquid argon time projection chambers play a crucial role in neutrino oscillation and dark matter experiments. Detecting scintillation light in these chambers is challenging due to the short wavelengths in the VUV range and the extremely low cryogenic temperatures (˜87 K) at which sensors operate. To take advantage of the higher photon detection efficiency (PDE) at the visible range, the use of wavelength shifters (WLS) is extended along the community. The Hamamatsu VUV4 S13370-6075CN Silicon PhotoMultiplier (SiPM) are VUV-sensitive sensors that can directly detect VUV light without the use of WLS, providing an improved PDE at these short wavelengths, and at the same time can detect the visible light from WLS if needed. The manufacturer provides a complete characterization of these sensors at room temperature. In this work we present the developed experimental setups used to measure the PDE of VUV4 SiPMs at cryogenic temperatures for different wavelengths in the range from 127 nm to 570 nm.

中文翻译：

---

滨松 VUV4 SiPM 低温下光子探测效率的测量

液氩时间投影室在中微子振荡和暗物质实验中发挥着至关重要的作用。由于 VUV 范围内的波长短以及传感器工作时的极低低温 (~87 K)，在这些室内检测闪烁光具有挑战性。为了利用可见光范围内更高的光子检测效率 (PDE)，波长移位器 (WLS) 的使用在整个社区得到扩展。 Hamamatsu VUV4 S13370-6075CN 硅光电倍增管 (SiPM) 是 VUV 敏感传感器，可以在不使用 WLS 的情况下直接检测 VUV 光，从而在这些短波长下提供改进的 PDE，同时可以检测来自 WLS 的可见光（如果需要。制造商提供了这些传感器在室温下的完整特性。在这项工作中，我们介绍了开发的实验装置，用于在低温下测量 127 nm 至 570 nm 范围内不同波长的 VUV4 SiPM 的 PDE。