A twin plasma apparatus including an anode plasma head and a cathode
plasma head. Each of the plasma heads includes an electrode and a plasma
flow channel and a primary gas inlet between at least a portion of the
electrode and the plasma flow channel. The anode plasma head and the
cathode plasma head are oriented at an angled toward one another. At
least one of the plasma flow channels includes three generally
cylindrical portions. The three generally cylindrical portions of the
plasma flow channels reduce the occurrence of side arcing.