Patent ID: 7166200
Filing Date: 2007-01-23
Classification: H01J

Abstract:
1. An upper electrode for a plasma processing system comprising: an electrode plate comprising a first surface for coupling said electrode plate to an upper assembly, a second surface comprising a plasma surface configured to face a processing space in said plasma processing system and a mating surface for mating said electrode plate with said plasma processing system, a peripheral edge, and one or more gas injection orifices coupled to said first surface and said second surface and configured to couple a processing gas to said processing space; a protective barrier coupled to a plurality of exposed surfaces of said electrode plate, said exposed surfaces comprising said plasma surface and said protective barrier being a coating which comprises Yttria; and a diagnostics port comprising an entrant cavity, and an exit through-hole, wherein said exit through-hole comprises an interior surface, wherein said exposed surfaces further comprise said interior surface of said diagnostics port.