Patent ID: 7411353

Claim:
A plasma generator having: a nozzle; a plasma gas; a plurality of annular electrodes, each annular electrode having an axis and an inner surface, each said annular electrode separated from said nozzle by a plasma channel; each said annular electrode having a source of initiated plasma, each said annular electrode having a plurality of apertures located on said inner surface, at least one said aperture positioned substantially tangent to a circle located between said inner surface and said axis, said apertures coupled to said plasma gas; said annular electrode also having a first plasma gas introduction region on an end furthest to said nozzle and a second plasma gas introduction region closest to said nozzle, said first plasma gas introduction region and said second plasma gas introduction region coupled to said plasma gas; said annular electrode apertures and said first and second plasma gas introduction regions causing a plasma forming on said annular electrode inner surface to rotate circumferentially and also to move from said electrode nozzle near end to said nozzle far end.