Abstract
Searching higher frequency regions for axion dark matter using microwave cavity detectors requires smaller size cavities as the resonant frequencies scale inversely with cavity radius. One of the intuitive ways to make an efficient use of a given magnet volume is to bundle an array of cavities together and combine their individual outputs ensuring phase-matching of the coherent axion signal. In this article, an extensive study of realistic design for the phase-matching mechanism of multiple-cavity systems is performed and its experimental feasibility is demonstrated using a double-cavity system.
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Notes
- 1.
Typical values of machining tolerance and step size of piezoelectric rotators are 50 μm and 0.1 m∘, respectively. They correspond to a frequency difference of ∼10 MHz and a frequency step of ∼0.5 kHz for the TM010 mode of a 5 GHz resonant cavity.
- 2.
Two cavities are on resonance at different frequencies at which the combiner does not see the reflected signal. Note that for the reflected signal the combiner acts as a splitter so that the final reflected signal at the common port is only one-fourth of the input signal.
References
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Acknowledgements
This work was supported by IBS-R017-D1-2017-a00/IBS-R017-Y1-2017-a00.
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Youn, S.W. (2018). Multiple-Cavity Detector for Axion Search. In: Carosi, G., Rybka, G., van Bibber, K. (eds) Microwave Cavities and Detectors for Axion Research. Springer Proceedings in Physics, vol 211. Springer, Cham. https://doi.org/10.1007/978-3-319-92726-8_13
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DOI: https://doi.org/10.1007/978-3-319-92726-8_13
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