Patent ID: 7128805

Claim:
A plasma generating device, comprising: a hollow cylinder having an upper end, a lower closed end, and an essentially vertical longitudinal axis; a dielectric plate, having an upper surface and a lower surface, disposed horizontally on said upper end of said hollow cylinder; a hemispherical dome above said upper surface of the dielectric plate, said hemispherical dome being coaxial with said hollow cylinder; a plasma cavity comprising the space defined by said hemispherical dome and said hollow cylinder; at least one pair of excitation cavities, each of said pair of excitation cavities shaped like a half of a longitudinally divided ellipsoid, said excitation cavities disposed on said upper surface of the dielectric plate on opposite sides of said hemispherical dome and along a horizontal diametral line thereof, a convex side of said excitation cavities oriented in an upper direction, said excitation cavities having first foci and second foci, said excitation cavities intersecting said hemispherical dome with said first foci of said excitation cavities being located within said plasma cavity; at least one of wave guiding devices, guiding microwaves to said excitation cavities at said second foci thereof; and an adjustable field regulating device housed in said hemispherical dome, controlling an electromagnetic field distribution inside said plasma cavity; wherein plasma is generated in said plasma cavity by microwaves.