Plasma cathode

Details Plasma cathode Plasma cathode

1989-11-16

1991-03-26

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

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

Electron or ion source

31511121, 31511131, 31511141, 31323131, H01J 1704

Patent

active

050032267

ABSTRACT:
An apparatus is disclosed for producing an electron stream comprising an elongated first electrode and an elongated, surrounding electrode defining an exit aperture and spaced from the first electrode by an interelectrode distance. An gas source introduces ionizable gas between the electrodes. The interelectrode distance is typically less than the mean free path for molecular collisions in the gas, to thereby physically impede the flow of the gas in the interelectrode area. A magnetic field is applied between and parallel to the electrodes and an electric field is applied between the electrodes, both combining to discharge the gas. An extractor screen is juxtaposed to the exit aperture to attract an electron stream from the discharge. In preferred embodiments, the source of gas is pulsed and the screen is substantially transparent to electrons but only semi-transparent to gas molecules, thereby impeding their passage through the exit aperture.

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