OPERATING CHARACTERISTICS OF LARGE DIAMETER PHOTOMULTIPLIERS. II. NOISE
The pulse-height distribution for the photomultiplier noise under a normalized gain was investigated as a function of photocathode to first dynode (P.C.-D.1.) voltage with two types of 7 in. diameter tubes (20th Century: VMP/ 11/ 170 and E.M.I. 9623). The two types of tubes showed very different characteristics which were ascribed to the difference in electron-optical structure of P.C.-D.1. system. VMP/11/170 tubes showed an optimal S/N ratio at about 150 v which could be explained by change in tube gain variance with the voltage. Noise spectra for 9623 tubes were critically dependent upon the potentials of two focusing electrodes. Some possible mechanisms for noise variations with 9623 are briefly discussed. (auth)
- Research Organization:
- National Inst. of Radiological Sciences, Chiba, Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-002051
- OSTI ID:
- 4143620
- Journal Information:
- Japan J. Appl. Phys., Journal Name: Japan J. Appl. Phys. Vol. Vol: 2
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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