APPARATUS AND METHOD FOR TREATING A WORKPIECE WITH IONIZING GAS PLASMA
An apparatus to treat a workpiece with an ionizing gas plasma at about atmospheric pressure. The apparatus may include an outer electrode with at least one opening that also serves to hold the workpiece. An inner electrode may fit at least partially within the workpiece so as to create a plasma discharge zone between the inner electrode and an inner surface of the workpiece. A gas supply manifold may be included that directs a gas into the plasma discharge zone. A power supply may be used to generate an ionizing gas plasma in the plasma discharge zone. In one embodiment, there is a coating on an inner surface of the workpiece.