Abstract
We report on aging measurements of a photon detector candidate, based on proportional wire chambers operating in TMAE, for the HERA-B RICH. The detector consisted of 64 cells, each 100 mm long and 8×8 mm 2 in area, constructed with brass cathode and 45 μm gold plated tungsten anode wire and was operated at room temperature with 50% TMAE saturated methane. To age the chamber it was exposed for several weeks to UV light from a deuterium lamp at 3 MHz/cm 2 counting rate, the expected maximum rate in the HERA-B RICH. The detection efficiency of the chamber for Cherenkov photons, generated in 5 m of argon by a 3 GeV electron testbeam at DESY, was recorded at regular intervals during the aging process. The pulse-height distribution of the chamber was continuously monitored. We found significant chamber gain loss after an exposure equivalent to about one month of running at HERA-B. Based on our results HERA-B decided to employ a multi-anode PMT system as photon detector in the RICH.
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