Speaker
Christian Joram
(CERN)
Description
The X-HPD concept is a modern implementation of the Dumand and Lake
Baikal approach to large area photon detectors, primarily aimed for water
based Cherenkov detectors. The main components are an almost spherical
vacuum tube of 8-inch diameter and a LYSO scintillation crystal mounted in
the centre of the tube. The scintillation light produced after the impact of a
photoelectron which was accelerated to about 20 keV energy is read out by
a small standard PMT. In addition to the attractive characteristics already
established with its historic predecessors, namely high gain, large collection
efficiency and immunity to the earth magnetic field, the X-HPD concept leads
to very high effective Q.E. values, an extended viewing angle and marginal
transit time spread. We present recent results obtained with 2 prototype tubes
built at CERN in collaboration with the company Photonis.
Author
Christian Joram
(CERN)
