Patent ID: 8057600
Filing Date: 2011-11-15
Classification: H01J

Abstract:
1. A baffle plate in a plasma processing system comprising: a ring comprising an upper surface, a lower surface, an inner radial edge coupled to said upper surface and said lower surface, an outer radial edge coupled to said upper surface and said lower surface, and at least one passageway coupled to said upper surface and to said lower surface and configured to permit the flow of a gas therethrough, wherein said lower surface comprises a mating surface extending radially inward relative to said outer radial edge and a plurality of fastener mating surfaces proximate extending radially outward relative to said inner radial edge, a recessed surface being provided on the mating surface proximate the outer radial edge or one of the plurality fastener mating surfaces proximate the inner radial edge or on both the mating surface and one of the plurality of fastener mating surfaces, and each of said at least one passageway comprises an internal passageway surface; and a protective barrier coupled to a plurality of exposed surfaces of said baffle plate, wherein said exposed surfaces comprise said upper surface, said lower surface excluding said mating surface and said plurality of fastener mating surfaces, and said internal passageway surface of each of said at least one passageway.