A post-evaporation quantum efficiency measurement system for large area CsI photocathodes for the Hall A RICH detector
INFN - Roma1, gr. Sanita'
A proximity focusing freon/CsI RICH detector has been
built for kaon physics at Jefferson Lab, Hall A. The Cherenkov photons are
detected by a UV-photosensitive CsI film which has been obtained by vacuum
evaporation. A dedicated evaporation facility for large area photocathodes
has been built for this task. A measuring system has been built to allow
the evaluation of the absolute quantum efficiency just after the
evaporation. We will describe the evaporation facility and the quantum
efficiency-measuring device. First results of the measurements performed
and their comparison with in-beam data will be presented.
You can download the presentation in PPT (MS Power Point) format