Photo-Detection Efficiency measurement for FBK HD Near-UV sensitive SiPMs at 10 K temperature
We measured the Photo-Detection Efficiency (PDE) of FBK NUV-HD-Cryo SiPMs at 10 K temperature with 405 nm and 530 nm light. The SiPMs have been tested under bias voltages between 6 - 11 V overvoltage (OV). The PDE increases as long as a greater OV is applied. With a bias of OV 9 V, the PDE reaches $\sim$ 40\% for both 405 nm and 530 nm light. The tests demonstrated that this type of SiPMs can be equipped as photosensors on a liquid helium Time Projection Chamber (TPC), which has been proposed for hunting for dark matter directly. In addition, we measured the SiPM's PDE at Room Temperature (RT). The results are well consistent with other measurements on similar model SiPMs.