Patent ID: 8287650

Claim:
A cover ring for use in a plasma processing chamber, comprising of: a ring-shaped body fabricated from a yttrium (Y) containing material, the body comprising of: a bottom surface having an inner locating ring and an outer locating ring, the inner locating ring extending further from the body than the outer locating ring, the inner locating ring having an inner wall, the inner wall facing a centerline of the ring-shaped body; an inner diameter wall having a main wall and a secondary wall separated by a substantially horizontal land, the secondary wall having a diameter greater than the main wall and less than the inner wall of the inner locating ring; and a top surface having a substantially horizontal inner top surface, an outer sloped surface, and an inner sloped surface, wherein the inner top surface is positioned outward of and above the substantially horizontal land and the outer sloped surface meets the inner sloped surface, the inner sloped surface defining an angle with a line perpendicular to a centerline of the body at less than about 70 degrees.