Extremum Seeking for RF cavity resonance control

Abstract

We present an Extremum Seeking approach for resonance control of radio frequency (RF) resonant cavities without phase measurements. The controller minimizes reflected power from an RF cavity by utilizing model-independent ES. Unlike phase measurement-based resonance controllers, this approach does not require cable length-based calibration. Furthermore, this adaptive approach automatically tracks temperature-induced cable length changes which could otherwise require re-calibration or uncompensated would introduce time-varying offsets. We give a theoretical overview of the problem, a general overview of the controller, and present experimental results.