Patent ID: 6439155
Filing Date: 2002-08-27
Classification: H01J,H05H

Abstract:
A remote plasma generator for generating a plasma within a gas carrier tube upstream of a process chamber, the generator comprising:a microwave energy generator; a microwave energy pathway from the generator, including: an isolator module in communication with the generator, the isolator module configured to protect the energy generator from reflected power; a waveguide communicating at a proximal end with the isolator module; and a microwave cavity communicating at a proximal end with a distal end of the waveguide, the cavity including a gas influent port and a radical effluent port, the gas carrier tube extending through each of the gas influent port and the radical effluent port, a sliding short defining a variable distal end of the microwave cavity, the sliding short dynamically controlled to match impedance of the microwave cavity with the waveguide in response to reflected power measured at the isolator module.