Author/Authors :
Vavra، نويسنده , , J. and Breskin، نويسنده , , A. and Buzulutskov، نويسنده , , A. and Chechik، نويسنده , , R. and Shefer، نويسنده , , E.، نويسنده ,
Abstract :
Wire-chamber gaseous electron multipliers coupled to CsI photocathodes, provide interesting means for UV-photon imaging over a very large area. We report on the measurement of the CsI resistivity, important for the understanding of rate-dependent effects in CsI-based detectors. Photon counting at high rates is also closely connected to long-term photocathode stability. We present results on ageing of CsI photocathodes under high photon flux, with one atmosphere CH4 and under a detector gain of 105, for several substrate materials. We compare the ageing results with that of CsI photocathodes coated with thin NaF protective films.
