Abstract
A new photomultiplier tube designed for the study of high speed and weak light phenomena is described. The tube has proximity electrode configuration to decrease the electron transit time spread and also incorporates MCP ( microchannel plate ) due to its excellent timing property. Sb-Cs photocathode was made directly upon the input surface of I:CP and photoelectrons emitted from the cathode were led into MCP by the aid of retarding field mesh arranged in front of iiCP. This configuration enabled to make photocathode in proximity type relatively easy. 10. -20. μA/ Lm range of photocathode current was obtained in tubes fabricated by this way. The tube showed that the gain was about 104 at total applied voltage of 1.8 Kv (1.2 Kv for chevron type MCP) and dark current was about 200 pA. Impulse response was measured by using short loser pulse of 26 psec FUHM. Tise time of 0.33 nsec was obtained. This value appeared to be quite reasonable when it was compaired with the value of 0.21 nsec estimated from electron transit time and its spread between photocathode and anode.
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