Patent ID: 8161906
Filing Date: 2012-04-24
Classification: H01J

Abstract:
1. A showerhead electrode assembly wherein the showerhead electrode comprises an upper electrode of a capacitively coupled plasma processing chamber, comprising: a backing plate having gas passages extending between upper and lower faces thereof; a clamp ring having an inwardly extending flange and stepped bores configured to receive fasteners which engage threaded openings in the lower face of the backing plate; the showerhead electrode comprising a plate having a plasma exposed surface on a lower face thereof, a mounting surface on an upper face thereof, the inner face including an outer step at an outer periphery of the plate, the outer step configured to mate with the inwardly extending flange of the clamp ring, the plate including process gas outlets arranged in a pattern matching the gas passages in the backing plate: and a compression ring between opposed surfaces of the clamp ring flange and the outer step of the showerhead electrode; jackscrews mounted in the lower face of the backing plate, the jackscrews being rotatable to move annular flanges on the jackscrews against the upper face of the showerhead electrode to separate the showerhead electrode from the backing plate during disassembly of the showerhead electrode.