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

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arxiv 2307.10433 v1 pith:GZ3HYB3I submitted 2023-07-19 physics.acc-ph

C. Contreras-Martinez (1) , B. Giaccone (1) , O. Melnychuk (1) , A. Netepenko (1) , Y. Pischalnikov (1) , S. Posen (1) , V. Yakovlev (1) ((1) Fermilab) This is my paper · ORCID
classification physics.acc-ph
keywords frequencycavitiescavitydarkexperimentusedactuatorsloop
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Two 2.6 GHz SRF cavities are being used for a dark photon search at the vertical test stand (VTS) in FNAL, for the second phase of the Dark SRF experiment. During testing at 2 K the cavities experience frequency detuning caused by microphonics and slow frequency drifts. The experiment requires that the two cavities have the same frequency within the cavity's bandwidth. These two cavities are equipped with frequency tuners consisting of three piezo actuators. The piezo actuators are used for fine-fast frequency tuning. A proportional-integral (PI) loop utilizing the three piezos on the emitter was used to stabilize the cavity frequency and match the receiver cavity frequency. The results from this implementation will be discussed. The integration time was also calculated via simulation.

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