Speaker
Description
We proposed a new type of hybrid photo-detector involving photocathode, scintillator, and silicon photomultiplier (SiPM) in vacuum enclosure. Photons incident onto the photocathode are converted to photo-electrons. Then the photo-electrons are accelerated toward the scintillator by the electric field between the photocathode and electrode to produce scintillation lights. The scintillation lights are incident on the SiPM to be converted to photo-electrons, which are subsequently multiplied to 106 electrons or more by the avalanche process inside SiPM. The advantage of this type of photo-detector is that the scintillation lights contribute an extra gain in the order of tens in addition to the existing gain of 106 or higher from the SiPM. This type of photo-detector with a large area of photocathode could be used in photo-detector array for neutrino detection. We present the test result obtained with a demonstrator built to prove the principle of this type of photo-detector. We also present the design and development of the experimental setup for fabrication of this type of detector.
