Patent ID: 8414736

Claim:
A plasma reactor for processing a workpiece, comprising: a processing chamber enclosure defining a process chamber interior and comprising a chamber side wall and a chamber ceiling, and a workpiece holder inside said process chamber interior; a conductive RF enclosure overlaying said ceiling and comprising a metallic base cylindrical side wall having a top edge; a shoulder ring supported on said top edge, the conductive RF enclosure further comprising a conductive top cylindrical sidewall extending from the said shoulder ring and supporting an overlying conductive cover; a floating support plate disposed inside said conductive RE enclosure separate from said conductive RF enclosure and located adjacent said shoulder ring; plural radially inner and outer RF plasma source power applicators suspended from said floating support plate in a space below said floating support plate and above said chamber ceiling; plural RF power sources, each of said plural RF power sources being coupled to a corresponding one of said plural RF plasma power applicators; and plural actuators fixed with respect to said shoulder ring and spaced about said shoulder ring at periodic intervals, each one of said plural actuators comprising an axially movable arm and a motor driving said movable arm in an axial direction and a rotatable joint having two joint ends, one of said joint ends being connected to said axially movable arm and the other of said joint ends being connected to a portion of said floating support plate adjacent said one actuator, whereby said floating support plate is supported at respective plural locations by the rotatable joint of each respective one of said plural actuators, and whereby said floating support plate is suspended independently of the conductive RF enclosure.