Patent ID: 9613834
Date: 2017-04-04
CPC Classifications: H01J,H01L

Claim:
1. A replaceable upper chamber section of a plasma reaction chamber in which semiconductor substrates can be processed, comprising: a monolithic metal cylinder having a conical inner surface which has a largest diameter at a lower end thereof, an upper flange extending horizontally outward away from the conical inner surface and a lower flange extending horizontally away from the conical inner surface; an upper annular vacuum sealing surface adapted to seal against a dielectric window of the plasma chamber; a lower annular vacuum sealing surface adapted to seal against a bottom section of the plasma chamber; a thermal choke at a lower portion of the cylinder effective to minimize transfer of heat across the lower vacuum sealing surface, the thermal choke defined by a thin metal section having a thickness of less than 0.25 inch and extending at least 25% of the length of the conical inner surface; and a thermal mass section at an upper portion of the cylinder, the thermal mass section defined by a portion of the cylinder between the conical inner surface, an outer surface extending vertically from the upper flange, a horizontal surface extending from an upper end of the thermal choke, and the upper flange.