Method and system for sealing a first assembly to a second assembly of a processing system

A sealing device configured to provide a seal between a first assembly of a processing system and a second assembly of the processing system, comprising:

• a first seal located between the first assembly and the second assembly at a first location proximate an interior of the processing system;
• the first assembly including an elevated temperature part heated by a heat source, said first assembly maintainable at an elevated temperature relative to the second assembly and including a gas injection plate extending laterally with respect to a longitudinal axis of a substrate stage moveable within the processing system;
• a second seal located between the first assembly and the second assembly at a second location proximate the first location;
• a third seal located between the first assembly and the second assembly at a third location proximate the second location;
• a first channel in the second assembly, connecting a first interface region disposed between the first seal and the second seal, and configured to couple the first interface region to a vacuum source or a purge gas supply;
• a second channel in the second assembly, connecting a second interface region disposed between the second seal and the third seal, and configured to couple the second interface region to the vacuum source or the purge gas supply;
• said first and second channels extending downward from the first and second interface regions and thereafter extending outwardly to an outside of the second assembly;
• the first assembly comprising a metallic assembly including a cooling device in between 1) the first, second, and third seals and 2) a part of the metallic assembly conducting heat from the heat source toward the second assembly;
• said cooling device proximate the first, second, and third seals, having a width extending along a direction of the first, second, and third seals and extending over the first, second, and third seals and over the first and second interface regions between the first, second, and third seals, and configured to reduce a temperature of a region of the first assembly proximate the first seal, and
• said cooling device comprising a temperature control element configured to maintain the first assembly at said elevated temperature relative to the second assembly.