Patent ID: 7837825
Filing Date: 2010-11-23
Classification: H01J

Abstract:
1. A plasma reactor comprising: a chamber; a bottom electrode and a top electrode enclosed within said chamber, wherein said top electrode and said bottom electrode are separated by a vertical distance, said top electrode including a first notch and a second notch, said top electrode further including a top electrode portion disposed between said first notch and said second notch; a first set of confinement rings surrounded by said top electrode portion, said first set of confinement rings including a first plurality of confinement rings, all confinement rings of said first plurality of confinement rings being disposed inside said first notch, said first set of confinement rings surrounding a first volume between said bottom electrode and said top electrode when said set of first set of confinement rings is in a lowered position of said first set of confinement rings; and a second set of confinement rings surrounding said top electrode portion, said second set of confinement rings including a second plurality of confinement rings, all confinement rings of said second plurality of confinement rings being disposed inside said second notch, said second set of confinement rings surrounding a second volume between said bottom electrode and said top electrode when said second set of confinement rings is in a lowered position of said second set of confinement rings.