Abstract: Dual channel showerhead assemblies are described. In some embodiments, the dual channel showerhead assemblies, which include a showerhead upper plate and a showerhead lower plate, enable delivery of mutually incompatible precursors along separate channels that mix in the process zone above a wafer. The dual channel showerhead assemblies provide at least two separate gas paths. In some embodiments, the hole design and hole distribution are configured for minimal jetting effect and plenum volumes for fast purging. The dual channel showerhead assemblies described herein may have a reduced purge out time compared to single channel showerheads, spiral dual channel showerheads, and bonded dual channel showerheads.

Abstract: A housing for a thermostat includes a body, a cavity, at least one director member and at least one retainer member. The body defines an enclosure that receives coolant fluid. The enclosure is in fluid communication with a pump that pumps the coolant fluid to a sink for dissipating heat extracted by the coolant fluid. The cavity configured on body receives and holds thermostat that determines temperature of coolant fluid. The director member is configured on at least one internal wall of the enclosure and defines flow path of the coolant fluid so as to direct coolant fluid to thermostat and facilitate sufficient contact between coolant fluid and thermostat and the retainer member configured on the body is disposed around thermostat to prevent the coolant fluid from bypassing of the thermostat, thereby retaining coolant fluid in contact with thermostat to ensure precise sensing of temperature by the thermostat.