High-volume tunable resonator for axion searches above 7 GHz
T. A. DysonStanford University, Stanford, California 94305, USAChelsea L. BartramSLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USAAshley DavidsonStanford University, Stanford, California 94305, USAJonah B. EzekielStanford University, Stanford, California 94305, USALaura M. FutamuraStanford University, Stanford, California 94305, USATongtian LiuStanford University, Stanford, California 94305, USAChao-Lin KuoSLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
2024en
ABI
Annotatsiya
While haloscope experiments searching for axion dark matter with cylindrical microwave cavity resonators are the most sensitive to date, that sensitivity is degraded at high frequencies, due to geometric scaling. The authors demonstrate a prototype thin-shell cavity resonator that decouples volume from resonant frequency, and thus avoids such degradation. As the resonator comprises two mechanically isolated pieces, a protocol is developed for robust, automated precision alignment, which enables a wide tuning range for the resonator's axion-sensitive TM${}_{010}$ mode. A discussion of the instrument's feasibility for high-frequency probes of the post-inflationary scenario is also offered.
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