PMT DARK CURRENT REDUCTION USING THERMOELECTRIC COOLING UNIT TE-206TSRF

Photomultiplier Tube (PMT) type EMI 9863Q with its housing and power supply of rang (1.5-3) kV, beside of the cooling unit type TE-206TSRF are used to perform this research. The evaluation of PMT dark current pulses count are carried out in laboratory at different high voltage and at different temperatures ,the results of these test, are plotted as a testing curves for this type of PMT. The research includes two tests ,one for perform the affect of cooling on the dark pluses counts, and the second test for determined time intervals for PMT housing can be kept the cooling . The maximum dark pluses count at 0° C Temp is 18000, where at -10° C is 4000, and at -20° C is 1000 at same H.V (2.5 kV).The PMT housing cooling stage times are sec for -10, sec for -20, sec for -30.