Patent ID: 6565717
Filing Date: 2003-05-20
Classification: H01J

Abstract:
An apparatus for processing a workpiece, said apparatus comprising:a processing chamber having a first wall and adapted to contain a plasma about a central axis; a workpiece support disposed in said processing chamber and having a support surface positioned to support a workpiece centered on said central axis; a sputtering target disposed in said processing chamber and comprising a conductive material to be sputtered from said target, said target defining an opening facing said workpiece support and positioned around said axis; a dielectric window forming a part of said first wall of said processing chamber, and facing said target opening so that said axis passes through said window; at least one coil disposed outside of said processing chamber and adjacent said dielectric window, said coil having at least one turn centered around said axis and being adapted to receive RF energy and generate RF electromagnetic fields positioned to pass through said dielectric window into said chamber to said plasma in said chamber; and a shield disposed within said processing chamber adjacent said dielectric window facing said target opening to prevent deposition of sputtered material onto at least a portion of said dielectric window, the shield being substantially circular and having a plurality of slots extending substantially radially between the edge and the center of the shield providing paths for flow of magnetic energy from said at least one coil into the processing chamber.