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The Superconducting Quantum Materials and Systems center is developingsearches for dark photons, axions and ALPs with the goal of improving upon thecurrent state-of-the-art sensitivity. These efforts leverage on Fermi NationalAccelerator expertise on ultra-high quality factor superconducting radiofrequency cavities combined with the center research on quantum technology.Here we focus on multiple axion searches that utilize ~1E10 quality factorsuperconducting radio frequency cavities and their resonant modes to enhancethe production and/or detection of axions in the cavity volume. In addition, wepresent preliminary results of single-mode and multi-mode nonlinearitymeasurements that were carried out as part of an experimental feasibility studyto gain insight on the behavior of the ultra-high quality factor resonators andthe experimental RF system in the regime relevant for axion searches.

Design of axion and axion dark matter searches based on ultra high Q SRF cavities