Patent ID: 8652297

Claim:
A plasma reactor comprising: a vacuum chamber enclosure and an overhead ceiling electrode; a coaxial power coupler comprising: (a) a hollow cylindrical outer conductor having a bottom end coupled to said enclosure and a top end, (b) a cylindrical inner conductor coaxial with said outer conductor and having a bottom end coupled to said ceiling electrode and a top end; a movable conductive element inside said hollow cylindrical outer conductor and surrounding an axial section of said hollow cylindrical inner conductor; respective plural motor drives contacting said hollow cylindrical outer conductor and connected to respective locations of said movable conductive element to control its non-concentricity relative to said cylindrical inner conductor, said movable conductive element being electrically coupled to said outer conductor through said motor drives; an elongate tap conductor electrically separate from and extending radially through said outer conductor and having a first end connected to said inner conductor and a second end outside of said outer conductor; an RF power generator; and an RF impedance match circuit outside of said outer conductor and comprising an output connected to said second end of said elongate tap conductor and an input connected to said RF power generator.