Patent ID: 7910013
Filing Date: 2011-03-22
Classification: H01J

Abstract:
1. A method of processing a workpiece on workpiece support pedestal in a plasma reactor chamber in accordance with user-selected values of plural plasma parameters of a group comprising ion density, wafer voltage, etch rate, wafer current, by controlling chamber parameters of source power, bias power and chamber pressure, said method comprising: a. for each one of said plural plasma parameters, fetching from a memory a relevant surface of constant value corresponding to the user-selected value of said one plasma parameter, said surface being defined in a 3-dimensional space of which each of said chamber parameters is a dimension, and determining an intersection of the relevant surfaces, said intersection corresponding to a target value of source power, bias power and chamber pressure; and b. setting said source power, bias power and the pressure in said chamber, respectively, to the target value.