A plasma reactor for processing a workpiece, including an enclosure defining a vacuum chamber, a workpiece support within the enclosure facing an overlying portion of the enclosure, the enclosure having at least first and second pairs of openings therethrough near generally opposite sides of the workpiece support. At least first and second hollow conduits are connected to respective pairs of the openings to provide at least first and second closed torroidal paths through the respective conduits and extending between respective pairs of the openings across the wafer surface. A process gas supply is coupled to the interior of the chamber for supplying process gas to the torroidal paths. Coil antennas are coupled to RF power sources and inductively coupled to the interior of the hollow conduits and capable of maintaining a plasma in the torroidal paths.