Abstract
A compact photomultiplier housing is described. The housing can provide controlled cooling to the photomultiplier tube down to −90°C. The cooling is accomplished by flowing liquid nitrogen cooled helium gas through a series of coils which envelope the photocathode portion of the tube. The temperature is controlled by controlling the flow of the gas with a fine adjustable needle valve. The temperature is measured near the photocathode of the photomultiplier by a calibrated thermistor.
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