Abstract:

The microdot gas avalanche detector is introduced and experimental measurements from the laboratory are described. Two separate batches of detector have been produced and results are presented showing the detectors gain dependence on cathode and drift voltage and the performance of such detectors to high intensity x-ray fluxes. The energy resolution at high rate and gain is also shown along with preliminary ageing measurements. Results obtained from single photo electron extraction by a UV source from the aluminium support of the drift cathode are presented at avalanche gains of up to 30000.