Patent ID: 8137467

Claim:
A chandelier-type showerhead comprising: (a) a stem comprising a convective cooling fluid passageway, a gas delivery passageway, a first end, and a second end opposite the first end, wherein: the ratio of the stem's length to the stem's width is at least 2:1, the first end is configured for attachment to a chamber, the convective cooling fluid passageway enters and exits the stem at the first end, and the gas delivery passageway enters the stem at the first end and exits the stem at the second end; (b) a back plate thermally coupled to the stem at the second end, wherein: the stem protrudes from the back plate, and the first end is offset from the back plate by a distance substantially corresponding to the length of the stem; (c) a heater physically attached to the back plate; (d) a face plate thermally coupled to the back plate; and (e) a temperature sensor for measuring a temperature of the face plate, wherein the temperature sensor is electrically connected to a cable routed from the first end to the second end, and wherein the cable is routed within a sheath between the first end and the second end.