Patent ID: 7824519

Claim:
A plasma processing chamber, comprising: a substrate support having a top surface defined to support a substrate in a substantially horizontal orientation within the chamber; and a plurality of telescopic members disposed within the chamber outside a periphery of the substrate support and concentric with both a center of the top surface of the substrate support and with each other, wherein each of the plurality of telescopic members is defined radially adjacent to its neighboring ones of the plurality of telescopic members such that a radial gap is not present between any neighboring ones of the plurality of telescopic members, wherein each of the plurality of telescopic members is defined to be independently moved in a substantially vertical direction relative to the top surface of the substrate support so as to enable adjustment of an open volume above the top surface of the substrate support, and wherein each of the plurality of telescopic members is structurally defined such that the plurality of telescopic members form a contiguous telescopic member arrangement at all vertical positions of the plurality of telescopic members.