Computer Determination of the External $Q$ and Resonant Frequency of Waveguide Loaded Cavities

A new method is proposed for determining the Qext of a cavity coupled to a waveguide that is well suited to integration with computer methods for determination of cavity resonant frequencies. It is related to, but distinct from, Slater's method, which has recently been applied in the same context. Application of the method to a set of waveguide models with comparison to analytic results is presented. An application to a damped accelerator cavity structure using MAFIA-determined resonant frequencies is also given.