High efficiency photocathodes for gaseous detectors of visible photons


Peskov V., Silin E.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol.367, no.1-3, pp.347-352, 1995 (SCI-Expanded) identifier identifier identifier

Abstract

Our latest results in the development of gaseous detectors for visible photons are presented in this paper. Quantum efficiencies of a few percent at 400 nm were routinely achieved. These detectors can operate at gas gains up to similar to 1000, The main effort was focused on a study of the effect of different liquids and solid layers on the quantum efficiency of photocathodes. Some of these layers make the photocathodes more robust, while others increase the quantum efficiency. It was found, for example, that thin layers of solid and liquid Xe and Kr enhance the quantum efficiency by a factor similar to 2. These solid layers can also protect the photocathodes against some impurities in the surrounding gas.