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Two 2.6 GHz SRF cavities are being used for a dark photon search at thevertical test stand (VTS) in FNAL, for the second phase of the Dark SRFexperiment. During testing at 2 K the cavities experience frequency detuningcaused by microphonics and slow frequency drifts. The experiment requires thatthe two cavities have the same frequency within the cavity's bandwidth. Thesetwo cavities are equipped with frequency tuners consisting of three piezoactuators. The piezo actuators are used for fine-fast frequency tuning. Aproportional-integral (PI) loop utilizing the three piezos on the emitter wasused to stabilize the cavity frequency and match the receiver cavity frequency.The results from this implementation will be discussed. The integration timewas also calculated via simulation.

PI Loop Resonance Control for Dark Photon Experiment at 2 K Using a 2.6 GHz SRF Cavity