Recent development of vacuum photon detectors from Hamamatsu Photonics
Hamamatsu Photonics has been providing several types of vacuum photon detectors for HEP experiments in many years. We have been making effort to develop new products accordingly. In this time, fast time response PMT series is shown as example. It includes 4 kinds of PMT sizes from 1-inch to 2-inch. T.T.S. of 170 ps was achieved in 1-1/8-inch PMT. This fast time response PMT series is suitable for TOF counter as well as PET in medical field. A new 20-inch PMT has been also developed for Neutrino physics experiments. It has high C.E. and fast time response. The details of these PMTs and other developmental products will be shown in this presentation.