Electric lamp and discharge devices: systems – Cathode ray tube circuits – With secondary emission stage in the cathode-ray tube
Patent
1985-05-08
1990-04-03
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
With secondary emission stage in the cathode-ray tube
313105R, 313105CM, H01J 2941
Patent
active
049143514
ABSTRACT:
Photomultiplier dynodes (D.sub.1, D.sub.2 . . . ) each comprise two spaced planes (D.sub.11 and D.sub.12) made up elementary laminations having a cross-section in the form of an isosceles triangle which is symmetrically disposed relative to the inlet window of the photomultiplier tube. The laminations in the two consecutive planes of a single dynode stage are offset relative to each other to constitute a baffle, and are disposed in such a manner that electrons leaving the first plane pass through the second plane without striking the laminations thereof. The distance Z.sub.1 between two dynode stages is large relative to the distance Z.sub.O between the two planes of a single dynode, and is chosen as a function of the electric field in such a manner that the secondary electrons from the upstream stage strike a limited number of the laminations in the downstream stage with a concentrated distribution.
REFERENCES:
patent: 3579017 (1971-05-01), Vestal
patent: 4649268 (1987-03-01), Persyk
Review of Scientific Instruments, vol. 52, No. 3, Mar. 1981, pp. 337-346, New York, U.S.A., Kuroda, "New Type of Position Sensitive Photomultiplier".
Agence Nationale de Valorisation de la Recherche (ANVAR)
Blum Theodore M.
Greer, Jr. Thomas J.
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