Electron multiplier with replaceable rear section

Details Electron multiplier with replaceable rear section Electron multiplier with replaceable rear section

1989-03-06

1991-07-09

DeMeo, Palmer C.

Electric lamp and discharge devices

Photosensitive

Secondary emitter type

313103CM, 313105CM, 313237, H01J 4304

Patent

active

050308785

ABSTRACT:
A segmented electron multiplier is disclosed with front and rear sections. The sections are specially designed so that the length of the rear section compared to the length of the front section is no less than 4:1. This permits multiple replacements of the rear section, after the multiplier wears out, without any unsatisfactory drop in the overall electrical gain produced by the repaired device. In the preferred embodiment, the front portion is a funnel having a tubular stem, and the rear portion is a straight tube with a cylindrical helical inner channel. The length-to-length split is 5:1, which theoretically permits up to six or seven replacements of the rear section before unsatisfactory gain occurs.

REFERENCES:
patent: 1920863 (1933-08-01), Hopkin, Jr.
patent: 2378164 (1945-06-01), Van Den Bosch et al.
patent: 2674661 (1954-04-01), Law
patent: 3312857 (1967-04-01), Farnsworth
patent: 3506868 (1970-04-01), Ceckowski et al.
patent: 3634690 (1972-01-01), Grant
patent: 3665497 (1972-05-01), Deradorian et al.
patent: 3684910 (1972-08-01), Stutzman et al.
patent: 3808494 (1974-04-01), Hayashi et al.
patent: 4188560 (1980-02-01), Swingler
patent: 4652788 (1987-03-01), Lauche et al.

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