Patent ID: 7964040

Claim:
A method of operating a substrate processing system having a substrate processing chamber and a gas exhaust system comprising a turbo molecular pump, a gate valve that can be closed to fluidly isolate the turbo molecular pump from the substrate processing chamber and first and second gas exhaust pathways that are fluidly coupled to an exhaust foreline, the method comprising: transferring a substrate into the chamber and performing a substrate processing operation on the substrate by introducing one or more process gases into the chamber while the substrate is positioned within the chamber and exhausting the one or more process gases from the chamber into the exhaust foreline with the turbo molecular pump through the first exhaust pathway fluidly coupled to the chamber at a first port downstream from the turbo molecular pump, wherein unwanted residue material builds-up on interior surfaces of the substrate processing chamber during the substrate processing operation; and transferring the substrate out of the chamber, closing the gate valve to isolate the turbo molecular pump from the chamber and performing a chamber clean operation by introducing an activated cleaning gas mixture into the chamber, reacting at least a portion of the cleaning gas mixture with the residue material, and removing the cleaning gas mixture from the chamber through the second exhaust pathway having at least second and third ports fluidly coupled to the chamber upstream from the turbo molecular pump.