Patent ID: 6744212
Filing Date: 2004-06-01
Classification: H01J

Abstract:
A plasma processing chamber configured to generate a confined plasma, comprising:a first powered electrode configured to receive a workpiece, said first powered electrode having a first electrode area; a power generator operatively coupled to said first powered electrode and configured to communicate power to said first powered electrode; a second electrode disposed at a distance from said first powered electrode, said first powered electrode and said second electrode configured to convert said gas to a plasma, said second electrode having a second electrode area; a plurality of confinement rings surrounding a volume within which said confined plasma is substantially disposed, the plurality of confinement rings being suspended parallel to and surrounding the first powered electrode and second electrode from within the plasma processing chamber, the plurality of confinement rings capable of being raised and lowered to extend into a region above and around the first powered electrode; and a ground extension adjacent said first powered electrode and surrounding said first powered electrode within the volume.