Cross talk study to the single photon response of a flat panel PMT for the RICH upgrade at LHCb

Abstract

The Ring Imaging CHerenkov, RICH, detector at LHCb is now readout by Hybrid Photon Detectors. In view of its upgrade a possible option is the adoption of the flat panel Photon Multipliers Tubes, PMT. An important issue for the good determination of the rings produced in the sensitive media is a negligible level of cross talk. We have

Characteristics and magnetic field properties of the Hamamatsu R11265 Multi-Anode Photomultiplier Tubes

“…Ideally, the electrons are confined to one channel as the pixels do not share the cascading stages. Due to geometric variation of the dynode and/or small nonuniformities of the electric field, electrons have a small probability to pass the boundary to a neighbouring cascade when travelling to the next dynode [6]. They get further multiplied in the other cascade and generate a cross talk signal in the neighbouring pixel.…”