A reactor comprises a chamber (31) defining a processing volume. A first electrode (32) is disposed inside the chamber and a second electrode (34) outside the chamber. A transformer has an input side and an output side, the input side being connected to and receiving power generated by, an RF power generator. The output side has at least one output terminal connected to the first electrode (32) and at least one other output terminal connected to the second electrode (34). The output side provides power to each of the first and second electrodes in accordance with a selected power ratio.
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