Pulsed plasma device and method for generating pulsed plasma

H - Electricity – 05 – H

Patent

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H05H 1/24 (2006.01)

Patent

CA 2695650

A device and a method for generating a truly pulsed plasma flow are disclosed. The device includes a cathode assembly comprising a cathode and a cathode holder, an anode, and two or more intermediate electrodes, the anode and the intermediate electrodes forming a plasma channel expanding toward the anode. The intermediate electrode closest to the cathode may form a plasma chamber around the cathode tip. An extension nozzle forming an extension channel having a tubular insulator along at least a portion of its interior surface is affixed to the anode end of the device. During operation, a voltage is applied between the cathode and the anode and a current is passed through the cathode, the plasma, and the anode. The voltage and current profiles are selected to cause the rapid development of a plasma flow with required characteristics. A substantially uniform temperature and power density distribution of the plasma pulse is achieved in the extension nozzle. Additionally, ozone may be generated in the extension nozzle during the generation of the plasma pulse.

L'invention concerne un dispositif et un procédé de génération d'un flux de plasma réellement pulsé. Le dispositif comporte un assemblage cathodique muni d'une cathode et d'un support de cathode, d'une anode, et de deux électrodes intermédiaires ou plus, l'anode et les électrodes intermédiaires formant un canal de plasma s'élargissant vers l'anode. L'électrode intermédiaire la plus proche de la cathode peut former une chambre de plasma autour de la pointe de cathode. Une buse de prolongement formant un canal de prolongement muni d'un isolateur tubulaire le long d'au moins une partie de sa surface intérieure est fixée à l'extrémité d'anode du dispositif. En service, une tension est appliquée entre la cathode et l'anode, et un courant traverse la cathode, le plasma et l'anode. Les profils de tension et de courant sont sélectionnés pour provoquer le développement rapide d'un flux de plasma muni de caractéristiques requises. Une distribution de température et de densité de puissance sensiblement uniforme de l'impulsion de plasma est obtenue dans la buse de prolongement. De plus, de l'ozone peut être généré dans la buse de prolongement durant la génération de l'impulsion de plasma.

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