Patent ID: 9279179
Filing Date: 2016-03-08
CPC Classification: C23C,H01J,H05H

Claim Text:
1. A plasma processing system, comprising: a processing chamber comprising a pedestal configured to hold a semiconductor workpiece; a plurality of coils having axes that are substantially perpendicular to an upper surface of the pedestal and that are located at positions laterally between a center of the pedestal and a sidewall of the processing chamber; a power supply configured to provide one or more control signals to the plurality of coils that cause the plurality of coils to independently form separate electric fields or magnetic fields; wherein the plurality of coils respectively comprise a first straight segment, a second straight segment parallel to the first straight segment, and a curved arc measuring greater than 180°, wherein the curved arc is connected between the first straight segment and the second straight segment and overlies a perimeter of the pedestal; and wherein the first straight segment and the second straight segment extend through the sidewall of the processing chamber at a location that is laterally outside the perimeter of the pedestal.