Patent ID: 8313610

Claim:
A temperature control module for a showerhead electrode assembly for a semiconductor material plasma processing chamber, the temperature control module comprising: a heater plate having a bottom surface adapted to be secured to a top surface of a top electrode of the showerhead electrode assembly, the top electrode having a plasma-exposed bottom surface, the heater plate including at least one heater adapted to supply heat to the top electrode to control the temperature of the top electrode; a cooling plate having a top surface adapted to be secured to and thermally isolated from a bottom surface of a top plate forming a top wall of the plasma processing chamber, the cooling plate adapted to control the temperature of the heater plate and control heat conduction between the heater plate and the top electrode; and a plurality of electrically and thermally conductive thermal chokes located between, and in contact with, a top surface of the heater plate and a bottom surface of the cooling plate, the thermal chokes adapted to control heat conduction between the heater plate to the cooling plate; wherein the thermal chokes comprise at least one first ring and a second ring surrounding the first ring, the second ring being non-porous and forming an outer surface of the temperature control module.