Comparative Measurements of the Performances of Four Super Bialkali Large Area Photomultipliers

Physics – Medical Physics

Scientific paper

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Scientific paper

The performances of four 10 inch. new super bialkali photomultipliers produced by Hamamatsu were measured and compared to those of a batch of 72 standard photocathode PMTs (R7081) with the same mechanical design. Measurements of the detection efficiency increase were performed carefully. Time and charge characteristics, fraction of spurious pulses and dark count rate were measured in order to define whether the quantum efficiency improvement process could introduce secondary effects. The results confirmed an increase in the quantum efficiency with respect to the standard photocathode of up to 39 %, with an increase in the dark count rate and the fraction of the type 2 after pulse. The local measurements performed scanning the photocathode surface with a narrow laser beam confirm that the uniformity of the super bialkali photocathode is no worse than that of the standard PMTs.

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