Apparatus and method for making a photocathode

Details Apparatus and method for making a photocathode Apparatus and method for making a photocathode

1989-09-22

1991-03-12

Ramsey, Kenneth J.

Coating processes

Measuring, testing, or indicating

427 74, 118668, 324158F, H01L 3118

Patent

active

049992112

ABSTRACT:
Apparatus for applying an activation layer to a photoemissive wafer of a photocathode, the photocathode having an electrically conductive layer surrounding a portion of its outer surface and contacting the photoemissive layer. A split-ring holder made of a conductive material is placed in a non-conductive support. The support is positioned in a metallic tray and the tray is located in the center of a rotatable carousel in a vacuum chamber. A photocathode is placed in the split-ring holder with its conductive layer contacting both sections of the holder. Electrical current is applied to one section of the split ring and a fork is touched to the other section of the split ring to determine if contact is being made between the conductive layer and the holder. Once it is determined that contact is being made, deposition of the activation layer begins.

REFERENCES:
patent: 4101824 (1978-07-01), Breedlove et al.
patent: 4306188 (1981-12-01), Ibaugh
patent: 4407857 (1983-10-01), Butterwick
patent: 4526802 (1985-07-01), Sato

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