Development of 144 multi-anode HPD for Belle aerogel RICH photon detector

Abstract

We have developed a new hybrid photon detector having 144 multi-anode pixels with Hamamatsu Photonics. This device is supposed to be implemented as a photon detector in a ring imaging Cherenkov counter for the Belle upgrade. The photon detector must be sensitive to a single photon with a position resolution of ∼ 5 × 5 mm2 and has to be immune to a high magnetic field of 1.5 Tesla. In addition, active area should be as large as ∼ 70 % with respect to a package size. A test sample was delivered in December 2006, and basic properties such as gain and noise have been tested. A clear response to a single photon light was observed. © Copyright owned by the author(s).