Patent ID: 7221553

Claim:
A substrate support for a substrate processing chamber, the substrate support comprising: (a) a chuck having a substrate receiving surface; (b) a fluid circulating reservoir and a second reservoir below the chuck, the fluid circulating reservoir comprising upper and lower walls that are joined by a peripheral sidewall extending outwardly from the upper wall, and the second reservoir comprising a third wall that is joined by the peripheral sidewall to the lower wall; (c) a fluid inlet to supply a heat transfer fluid to the fluid circulating reservoir; (d) a plurality of protrusions comprising spaced apart mesas that extend into the fluid circulating reservoir a sufficient length to cause the heat transfer fluid to flow around the protrusions, thereby perturbing the flow of heat transfer in the fluid circulating reservoir; and (e) a fluid outlet to discharge the heat transfer fluid from the fluid circulating reservoir into the second reservoir.