Patent ID: 7520999
Filing Date: 2009-04-21
Classification: H01J

Abstract:
1. A method for processing a workpiece in a plasma reactor chamber having radially inner and outer source power applicators at a ceiling of said chamber facing said workpiece, said inner and outer source power applicators and said workpiece sharing a common axis of symmetry, said method comprising: applying RF source power to said source power applicators, and introducing a process gas into the reactor chamber so as to carry out a plasma process on said workpiece characterized by a plasma process parameter, said plasma process parameter having a spatial distribution across the surface of said workpiece; rotating at least one of (a) said workpiece, (b) said outer source power applicator, about a radial tilt axis to a position at which said spatial distribution of said plasma process parameter has at least a nearly minimal non-symmetry relative to said common axis of symmetry; and translating said inner source power applicator relative to said outer source power applicator along said axis of symmetry to a location at which said spatial distribution has at least a nearly minimal non-uniformity across the surface of said workpiece.