A method in a plasma processing system for processing a semiconductor
substrate is disclosed. The plasma processing system includes a plasma
processing chamber and an electrostatic chuck coupled to a bias
compensation circuit. The method includes igniting a plasma in a plasma
ignition step. Plasma ignition step is performed while a first bias
compensation voltage provided by the bias compensation circuit to the
chuck is substantially zero and while a first chamber pressure within the
plasma processing chamber is below about 90 mTorr. The method further
includes processing the substrate in a substrate-processing step after
the plasma is ignited. The substrate-processing step employs a second
bias compensation voltage provided by the bias compensation circuit that
is higher than the first bias compensation voltage and a second chamber
pressure substantially equal to the first chamber pressure.