Device with unheated hollow cathode for the dynamic generation o

Details Device with unheated hollow cathode for the dynamic generation o Device with unheated hollow cathode for the dynamic generation o

1992-03-03

1993-08-31

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

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

Plasma generating

31511181, 31323131, H05H 124

Patent

active

052412431

ABSTRACT:
A hollow cylinder (3) of suitable material (the cathode) and one or more anodes (5, 7) of suitable shape and dimensions permits the generation of high-density plasma capable of being used particularly (but not exclusively) for applications in space. The plasma is produced by an electrical discharge in a gas which flows in the device through the cathode (3) and suitable orifices (8, 27) formed in the anodes (5, 7) in order to create a pressure difference between the cathode cavity (3C) in which the discharge is to be initiated and the exterior of the device. The discharge is initiated in the first place between the hollow cathode (3) and the first anode (5) and is then transmitted to the following anodes. The cathode (3), unlike the usual hot cathodes, not only does not have a filament to heat it to a suitable temperature before the initiation of the discharge, but can operate even if kept suitably cold.

REFERENCES:
patent: 4301391 (1981-11-01), Seliger et al.
patent: 4458180 (1984-07-01), Sohval et al.
patent: 4714834 (1987-12-01), Shubaly
patent: 4749912 (1988-06-01), Hara et al.
patent: 4785220 (1988-11-01), Brown et al.
patent: 4800281 (1989-01-01), Williamson
patent: 5075594 (1991-12-01), Schumacher et al.

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