A photomultiplier cooler for use over extended periods of operation

Abstract
A photomultiplier cooler is described which uses as the cooling device a standard refrigeration unit, similar to the kind used in domestic refrigerators. The authors believe this is the first time that such a unit has been employed in the present application. The cooler has an operating temperature of -20 degrees C and is very convenient to use. It is relatively inexpensive to construct and has been in continuous operation for a period of many months.

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