Patent ID: 7513971
Filing Date: 2009-04-07
Classification: H01J

Abstract:
1. A plasma etch reactor, comprising: a vacuum pressure chamber having a dome-shaped window wall portion; a support adapted to support a semiconductor workpiece within said chamber; and an RF coil disposed external and adjacent to said window wall portion wherein said coil has a plurality of 360 degree turns including a first 360 degree turn, a second 360 degree turn and a plurality of 360 degree turns between said first and second 360 degree turns, each 360 degree turn being in close physical proximity to an adjacent 360 degree turn and being wound around said window wall portion so that said window wall portion extends through an opening defined by at least a plurality of said turns, each 360 degree turn comprising a flat portion and a sloped portion interconnecting flat portions of adjacent 360 degree turns, wherein each flat portion of each 360 degree turn comprises a majority of the 360 degree turn.