Focus electrode for elongated hexagonal photomultiplier tube

Details Focus electrode for elongated hexagonal photomultiplier tube Focus electrode for elongated hexagonal photomultiplier tube

1990-06-20

1991-10-29

Yusko, Donald J.

Electric lamp and discharge devices

Photosensitive

Photomultiplier

313536, 313537, H01J 4318

Patent

active

050618750

ABSTRACT:
A focus electrode for an elongated hexagonal faceplate photomultiplier tube. The elongated hexagonal face plate and an off-center cage assembly are made to function properly in a photomultiplier tube by the use of a uniquely shaped asymmetric focus electrode. The focus electrode has a base which is a partial circle with two parallel chords and is constructed with a side wall around the perimeter of the base. The side wall has different heights above the two parallel chords of the base and slopes down to minimum but equal heights at points on the curved perimeter which are approximately at the center plane of the tube.

REFERENCES:
patent: 2678400 (1954-05-01), McKay
patent: 2908840 (1959-10-01), Anderson
patent: 2913610 (1959-11-01), Henderson
patent: 4079282 (1978-03-01), Faulkner
patent: 4112325 (1978-09-01), Faulkner
patent: 4570102 (1986-02-01), McDonie et al.
patent: 4855642 (1989-08-01), Helvy et al.
patent: 4881008 (1989-11-01), Kyushima et al.

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