Magnetron with reduced dark current

Details Magnetron with reduced dark current Magnetron with reduced dark current

1994-12-21

1997-06-03

Lee, Benny T.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Distributed parameter resonator-type magnetron

315 3951, H01J 2550, H01J 2310

Patent

active

056357982

ABSTRACT:
A magnetron preventing increases of dark current by making an axial static magnetic field on a plane containing an inner surface of an end shield on the microwave output port side in the interaction space different from the static magnetic field on a plane containing an inner surface of the end shield on the cathode stem side. The interaction-space-side axial end of a peripheral portion of the end shield associated with the weaker static magnetic field is displaced a predetermined distance axially toward the interaction space from the axial ends of the magnetron vanes. In one embodiment, the axial static magnetic field on a plane containing an inner surface of the end shield on the microwave output port side in the interaction space is made stronger than the static magnetic field on a plane containing an inner surface of the end shield on the cathode stem side. This compensates for eccentricity of the axis of the cathode with respect to the axis of the anode vanes. Such eccentricity is greater on the microwave output port side remote from the cathode stem.

REFERENCES:
patent: 3392308 (1968-07-01), Cook
patent: 3916247 (1975-10-01), Koinuma et al.
patent: 3987333 (1976-10-01), Nakada et al.
patent: 4048542 (1977-09-01), Miura
patent: 5049782 (1991-09-01), Aiga et al.

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