PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Astroparticle Physics and Cosmology
Search for QCD axion dark matter around 24.5 μeV using an 8-cell microwave resonant cavity haloscope and a flux-driven Josephson parametric amplifier
C. Kutlu*, S. Lee, S.V. Uchaikin, S. Ahn, S. Bae, J. Jeong, S. Youn, A.F. van Loo, Y. Nakamura, S. Oh and Y. Semertzidis
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Pre-published on: December 03, 2022
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Axion, a hypothetical particle originally emerging from a proposed solution to the
strong $CP$ problem of particle physics, is one of the favored candidates addressing
the dark matter puzzle. As part of the efforts within the Center for Axion and Precision
Physics Research of the Institute for Basic Science, we are searching for
axion dark matter using the haloscope method sensitive to masses around $24.5~\mathrm{eV}$ at Kim-Shifman-Vainshtein-Zakharov (KSVZ)
sensitivity. A unique 8-cell cavity, used for the first time in search of KSVZ axions,
is cooled down to $40~\mathrm{mK}$ within a magnetic field of $8~\mathrm{T}$. The expected axion
signal resonating with the $\mathrm{TM}_{010}$-like mode of the cavity is picked up using an antenna
and transferred to the readout chain. Implementing a flux-pumped Josephson parametric
amplifier with $20~\mathrm{dB}$ gain as the first stage of amplification, the system
noise temperature was estimated to be $450~\mathrm{mK}$, corresponding to 1.6
photons. In this paper, we present results from data taken between December 2021 and
June 2022, covering approximately $100~\mathrm{MHz}$.
DOI: https://doi.org/10.22323/1.414.0092
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