Patent ID: 8480850

Claim:
An apparatus for treating a workpiece with plasma, comprising: a vacuum chamber having a chamber base and a chamber lid movable relative to said chamber base between a closed position that defines a processing space surrounded by said chamber base and said chamber lid and an open position for transferring a workpiece having an exposed surface into and out of said processing space; an exhaust port in said vacuum chamber for evacuating said processing space; a workpiece holder located in said processing space and comprising a substantially planar support platform; a process gas supply port in said vacuum chamber for introducing a process gas to said processing space; and a plasma excitation source operable to provide a plasma in said processing space from said process gas and including an RF power supply and a powered electrode which is substantially parallel in the planar support platform of the workpiece holder and electrically connected to said RF power supply; wherein said chamber lid includes a first sidewall section capable of being removed from or added to said chamber lid for changing a vertical dimension of said vacuum chamber by changing the dimension of said chamber lid in the vertical direction so as to maintain a reproducible distance between said powered electrode and the exposed surface of the workpiece held by said workpiece holder.