Abstract

The timing performances of two high speed RCA-C70045D photomultipliers were studied and compared with that of an optimised RCA-8850 photomultiplier. The C70045D is a 14 stage, side-on type tube employing a semi-transparent bi-alkali photocathode (cesium-potassium-antimony) of spherical section with beryllium oxide as the secondary emitting surface. This tube is not in the current RCA photomultipliers catalogue PIT-700C. In the earlier catalogue PIT-700B, it was listed as the fastest conventional photomultiplier. The test was carried out using a measuring system incorporating a subnanosecond light flasher. This had less than 200 ps rise time, with full width at half maximum of less than 300 ps and a repitition frequency capability of up to 1 MHz. The minimum overall time resolution of the measuring system was 132 ps.

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