Patent ID: 8668815

Claim:
A cover ring for placement about a deposition ring in a substrate processing chamber, wherein the deposition ring is adapted to be positioned between a substrate support and a cylindrical shield in the chamber, the cover ring comprising: an annular wedge comprising: an inclined top surface sized to encircle the substrate support, the inclined top surface having an inner periphery and an outer periphery; a footing extending downward from the inclined top surface and configured to rest on the deposition ring; and a rounded projecting brim about the inner periphery of the inclined top surface, wherein a dual-stepped surface is formed by an arc-shaped gap opposite the inclined top surface between the footing and a lower surface of the projecting brim; an inner cylindrical band extending downward from the annular wedge; and an outer cylindrical band extending downward from the annular wedge, wherein the inner cylindrical band has a height smaller than a height of the outer cylindrical band, wherein the inner cylindrical band and the outer cylindrical band are located radially outward of the footing of the annular wedge and an outer periphery of the outer cylindrical band extends vertically upward to the outer periphery of the inclined top surface.