Patent ID: 8736175
Filing Date: 2014-05-27
Classification: H01J

Abstract:
1. A plasma processing system for generating plasma to process at least a wafer, the plasma processing system comprising: a first coil for conducting a first current for sustaining at least a first portion of the plasma; a first current magnitude sensor coupled with the first coil for measuring a magnitude of a supplied current to provide a first magnitude measurement without measuring any phase angle of the supplied current, the supplied current being the first current or a total current that is used for providing a plurality of currents, the plurality of currents including the first current when the supplied current is the total current; and a first controller coupled with the first current magnitude sensor for generating a first command using at least one of the first magnitude measurement and information derived using the first magnitude measurement, without using information related to any phase angle measurement, and for providing the first command for controlling at least one of the magnitude of the supplied current and a magnitude of the total current.