Patent ID: 8454027

Claim:
A clockable device for use with an electrostatic chuck configured to hold a substrate in a plasma environment, the clockable device comprising: a coupling ring configured to surround a periphery of at least a portion of the electrostatic chuck and thermally contact an edge ring mounted in proximity to the electrostatic chuck, the coupling ring comprising a first portion of the coupling ring having a first set of opposing faces, at least one of the first set of opposing faces having a first plurality of raised features formed thereon; and a second portion of the coupling ring having a second set of opposing faces, at least one of the second set of opposing faces having a second plurality of raised features formed thereon and arranged to be thermally coupled to the first plurality of raised features, the first portion of the coupling ring and the second portion of the coupling ring configured to have variable mechanical contact areas when brought into physical contact with one another, a degree of thermal coupling between the first and second portions configured to be controlled by clocking the first portion with respect to the second portion.