Electron beam gun

Details Electron beam gun Electron beam gun

1988-09-02

1990-06-05

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Discharge device load with fluent material supply to the...

Electron or ion source

31511101, 313230, 31323101, H01J 2948

Patent

active

049317008

ABSTRACT:
A cold cathode electron gun utilizes a metallic torus for electrostatic focusing of an electron beam. A nonconductive tube is disposed within and along the axis of the torus. A conductive aerodynamic body electrically connected to the torus forms an annular venturi in the tube and includes a face which serves as a high field emitting surface. High molecular weight gas is introduced into a proximal end of the tube at a stagnation pressure sufficient to produce supersonic flow thereby causing a vacuous gas region adjacent the emitting surface. The torus and emitting surface are driven to a very high negative potential by a Tesla transformer or the like, producing high field emission into the vacuous region. The electric field of the torus produces, from the emitted electrons, an electron beam which issues from the tube into the atmosphere.

REFERENCES:
patent: 4240005 (1980-12-01), Keller
patent: 4422013 (1983-12-01), Turchi et al.
patent: 4426597 (1984-01-01), Denoyer et al.
patent: 4563608 (1986-01-01), Lawson et al.

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