Patent ID: 7972444

Claim:
A workpiece support for holding a workpiece in a process chamber: a workpiece support defining a workpiece-receiving surface for receiving and holding a workpiece; a plurality of partitioned fluid zones on the workpiece-receiving surface, each fluid zone being in communication with a separate fluid line, wherein, when fluids are fed to each of the fluid zones, each fluid zone becomes pressurized, the fluid zones being separated by ridges on the workpiece-receiving surface, the top surface of the ridges contacting the bottom surface of the workpiece when the workpiece is placed on the workpiece-receiving surface such that the workpiece, the workpiece-receiving surface, and the ridges define an enclosed volume for each partitioned fluid zone, and wherein at least certain of the zones have a different azimuthal position on the workpiece-receiving surface, and further wherein the fluid line for each fluid zone comprises a control valve configured to independently control pressure in each respective fluid zone to adjust the temperature across a workpiece received onto the workpiece support; wherein the workpiece-receiving surface has a perimeter and includes an outer periphery adjacent to the perimeter, the outer periphery comprising a peripheral band that is divided into the fluid zones having different azimuthal positions; and wherein the workpiece support further includes a fluid zone centrally located on the workpiece-receiving surface.