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PHOTOCATHODE PROTECTION CIRCUIT,
SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF VISIBILITY LAB
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A photocathode protection circuit applicable to high voltage electron multiplier devices was developed and successfully used. Application to a image dissector tube is described. The protection circuit features the positive firing action of a silicon-controlled rectifier, current cutoff by reverse biasing of the photocathode, and photocathode current calibration and monitoring. Inherent safeguard against socket leakage and arcing is also discussed. Author
APPROVED FOR PUBLIC RELEASE