Patent ID: 8911590

Claim:
A plasma processing chamber configured to generate a plasma, comprising: a bottom electrode assembly having an bottom electrode and a conductive ring surrounding the bottom electrode, wherein the conductive ring is separated from the bottom electrode by a dielectric ring and the conductive ring is grounded, wherein the bottom electrode is configured to receive a substrate; and a top electrode assembly including a top capacitive electrode, an inner and an outer inductive coil disposed above the top capacitive electrode, the outer inductive coil is disposed over a surface of the conductive ring that is defined outside of a circumference of the bottom electrode, and the inner inductive coil is disposed over a surface of the bottom electrode and positioned inside of the outer inductive coil, such that the outer inductive coil and the inner inductive coil are each coupled to a separate power supply to define a region between the outer inductive coil and the conductive ring with inductive power separately from a region between the inner inductive coil and the bottom electrode.