Patent ID: 8080168

Claim:
A method for confining a plasma in an etch chamber having a plurality of confinement rings, each of the plurality of confinement rings supported by a plurality of bellows sleeves, comprising method operations of: performing an etch process in the etch chamber; monitoring processing parameters of the etch chamber; and adjusting spacing between each of the plurality of the confinement rings in a manner that the spacing adjustment applied to each of the plurality of the confinement rings is substantially equal, the adjusting including, moving a plurality of plungers along an axis substantially orthogonal to a plane of the plurality of confinement rings such that movement of the plurality of plungers results in spaces between each of the plurality of confinement rings to proportionally adjust, wherein each of the plurality of bellows sleeves includes a number of protrusions, the protrusions having a diameter greater than a diameter of a hole defined through each of the plurality of confinement rings, and wherein one of the plungers and one of the bellows sleeves is disposed through the hole.