Patent ID: 8466697

Claim:
In a plasma processing, chamber having a movable lower electrode, a detection circuit arrangement comprising: a flexible connector having a first flexible connector end, a second flexible connector end and at least a slit, wherein at least a portion of said slit is disposed in a direction parallel to a line drawn between said first flexible connector end and said second flexible connector end, said first flexible connector end is coupled to said movable lower electrode, said second flexible connector end is coupled to a component of said plasma processing chamber, wherein said flexible connector is configured to provide a low impedance current path between said movable lower electrode and said component of said plasma processing chamber; and means for detecting current flow through conductor material disposed on one side of said slit, said means for detecting including at least a coil wound around at least said conductor material disposed on said one side of said slit and a detector circuit coupled to said coil for detecting said current flow.