Patent ID: 8617347
Filing Date: 2013-12-31
Classification: C23C,H01J,H01L

Abstract:
1. A vacuum processing apparatus comprising: a workpiece support disposed along a longitudinal axis of a first vacuum processing chamber, the workpiece support having a top surface spanning a first radial distance from the longitudinal axis to hold the workpiece, and a lower surface opposite the top surface; a pump port disposed in a wall of the first vacuum processing chamber below the lower surface of the workpiece support to couple the first vacuum processing chamber to a vacuum pump; and a flow equalizer disposed in the first vacuum processing chamber between the lower surface of the workpiece support and the pump port, the flow equalizer movable, independent from the workpiece support, in response to a workpiece pressure control signal to variably restrict gas conductance downstream of the top surface of the workpiece support and upstream of the pump port, wherein the flow equalizer further comprises: