Patent ID: 7618516
Filing Date: 2009-11-17
Classification: H01J,Y10S

Abstract:
1. A process kit for using in a plasma processing chamber, comprising: an annular ring comprising: an upper outer wall defining the outermost diameter of the ring; a lower outer wall, wherein the diameter of the lower outer wall is smaller than the diameter of the upper outer wall; an intermediate outer wall formed between the upper outer wall and the lower outer wall; a step defined by the intermediate outer wall between the upper and lower outer wall, wherein the step defined by the intermediate outer wall is formed upward and outward from the lower outer wall and inward and downward from the upper outer wall; a substantially vertical inner wall disposed opposite the upper and lower outer wall, the inner wall defining the innermost diameter of the ring; a bottom wall connecting the lower outer wall and the substantially vertical inner wall; and a substantially horizontal top surface connecting the upper outer wall and the substantially vertical inner wall.