Focusing structure for photomultiplier tubes

Details Focusing structure for photomultiplier tubes Focusing structure for photomultiplier tubes

1979-08-13

1981-12-15

Demeo, Palmer C.

Electric lamp and discharge devices

Geiger-mueller type

H01J 4004

Patent

active

043061710

ABSTRACT:
An electron discharge tube includes an evacuated envelope comprising a photocathode, an anode, a primary dynode and a secondary dynode for propagating and concatenating electron emission from the photocathode to the anode. A focusing electrode is disposed between the photocathode and the dynodes. The focusing electrode is capable of generating an electric field for focusing the electron emission between the photocathode and the primary dynode and also between the primary dynode and the secondary dynode. The focusing electrode has a planar surface that is reflective to light transmitted through the photocathode so that some of the transmitted light is returned to the photocathode to increase the responsivity of the tube.

REFERENCES:
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patent: 3771004 (1973-11-01), Plumeau
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patent: 4079282 (1978-03-01), Faulkner et al.
patent: 4112325 (1978-09-01), Faulkner
patent: 4112326 (1978-09-01), Faulkner
patent: 4125793 (1978-11-01), Timan

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