A method and apparatus for generating and controlling a plasma (130)
formed in a capacitively coupled plasma system (100) having a plasma
electrode (140) and a bias electrode in the form of a workpiece support
member (170), wherein the plasma electrode is unitary and has multiple
regions (R.sub.i) defined by a plurality of RF power feed lines (156) and
the RF power delivered thereto. The electrode regions may also be defined
as electrode segments (420) separated by insulators (426). A set of
process parameters A={n, .tau..sub.i, .PHI..sub.i, P.sub.i, S; L.sub.i}
is defined; wherein n is the number of RF feed lines connected to the
electrode upper surface at locations L.sub.i, .tau..sub.i is the on-time
of the RF power for the i.sup.th RF feed line, .PHI..sub.i is the phase
of the i.sup.th RF feed line relative to a select one of the other RF
feed lines, P.sub.i is the RF power delivered to the electrode through
the i.sup.th RF feed line at location L.sub.i, and S is the sequencing of
RF power to the electrode through the RF feed lines. One or more of these
parameters are adjusted so that operation of the plasma system results in
a workpiece (176) being processed with a desired amount or degree of
process uniformity.