Cathode assembly and method for pulsed plasma generation

H - Electricity – 05 – H

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Details

H05H 1/34 (2006.01) H05H 1/36 (2006.01)

Patent

CA 2695902

A cathode assembly and a method for generation of pulsed plasma are disclosed. The cathode assembly comprises a cathode (2) holder connected to multiple longitudinally aligned cathodes (10,20,30), preferably of the same diameter, and different lengths. The method is characterized by forming an electric arc between the cathodes (10,20,30) in the assembly and an anode (4) by passing DC current of a predetermined magnitude. Once the arc is established the current is reduced to the magnitude sufficient to sustain an electric arc, or a slightly larger magnitude, thereby reducing the area of arc attachment to a single cathode. Once the area of attachment has been reduced, the current is raised to the operational level of the pulse, while the area of attachment does not increase significantly.

La présente invention concerne un ensemble cathodique et un procédé de génération de plasma pulsé. L'ensemble de cathodique comporte un support de cathodes (2) relié à une pluralité de cathodes alignées dans le sens de la longueur (10, 20, 30), de préférence de même diamètre, et de différentes longueurs. Le procédé se caractérisé par la formation d'un arc électrique entre les cathodes (10, 20, 30) dans l'ensemble et d'une anode (4) en faisant circuler un courant continu de grandeur prédéterminée. Une fois l'arc établi, le courant est réduit à la grandeur suffisante pour maintenir l'arc électrique, ou une grandeur légèrement supérieure, réduisant ainsi la surface de fixation d'arc à une seule cathode. Une fois la surface de fixation réduite, le courant est élevé à un niveau opérationnel de l'impulsion, tandis que la surface de fixation ne s'accroît pas de manière significative.

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