Phototube having improved electron collection efficiency

Details Phototube having improved electron collection efficiency Phototube having improved electron collection efficiency

1975-02-28

1977-02-01

Segal, Robert

Electric lamp and discharge devices

Geiger-mueller type

313102, H01J 3904, H01J 3900

Patent

active

040063763

ABSTRACT:
Photoelectrons emitted from a flat photocathode are collected within an evacuated envelope by a surface of an electrode. The photoelectrons are accelerated by an electron lens system, as an electron stream, within an evacuated cavity between the photocathode and the electrode surface. The photoelectrons are accelerated through two succeeding cavity regions in which the electron trajectories associated with the electron stream are increasingly compressed. A cavity region of lessening compression of the electron trajectories associated with the electron stream is defined between the two cavity regions of increasing compression. The electrode surface is located closely proximate to the cavity region of greatest compression to collect a maximum number of the photoelectrons.

REFERENCES:
patent: 2487665 (1949-11-01), Morton et al.
patent: 2908840 (1959-10-01), Anderson
patent: 3875441 (1975-04-01), Faulkner

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