High rate (up to 105 Hz/cm2), high position resolution (30 μm) photosensitive RPCs

In many applications there is a need for high position resolution VUV and UV imagers. For these applications we have developed and successfully tested 1D and 2D VUV imaging detectors based on microgap RPCs. Two versions of these detectors were extensively tested: one filled with photosensitive vapours and the other one with the GaAs cathode coated by a 400 nm thick CsI layer. The main feature of these detectors is the high position resolution—30 μm in digital form. Additionally, it is spark-protected and can operate at high counting rates (up to 105 Hz/cm2). In this study the results in application for these detectors for spectroscopy are presented.