Search for Dark Matter Axions with CAST-CAPP
C. M. Adair, K. Altenm\"uller, V. Anastassopoulos, S. Arguedas, Cuendis, J. Baier, K. Barth, A. Belov, D. Bozicevic, H. Br\"auninger, G., Cantatore, F. Caspers, J. F. Castel, S. A. \c{C}etin, W. Chung, H. Choi, J., Choi, T. Dafni, M. Davenport, A. Dermenev, K. Desch

TL;DR
This paper reports on a search for dark matter axions using the CAST-CAPP haloscope at CERN, setting new limits on axion-photon coupling in the 19.74 to 22.47 μeV mass range based on 4124 hours of data.
Contribution
It introduces a phase-matched resonator array in a dipole magnet for axion detection and reports the first results excluding certain axion-photon couplings in this mass range.
Findings
Excluded axion-photon couplings down to 8 x 10^{-14} GeV^{-1} at 90% CL.
Operated with four cavities over 4124 hours, tuning frequency from 4.774 to 5.434 GHz.
Demonstrated phase-matching technique for future large-scale axion searches.
Abstract
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 eV to 22.47 eV mass range. The detection concept follows the Sikivie haloscope principle, where Dark Matter axions convert into photons within a resonator immersed in a magnetic field. The CAST-CAPP resonator is an array of four individual rectangular cavities inserted in a strong dipole magnet, phase-matched to maximize the detection sensitivity. Here we report on the data acquired for 4124 h from 2019 to 2021. Each cavity is equipped with a fast frequency tuning mechanism of 10 MHz/min between 4.774 GHz and 5.434 GHz. In the present work, we exclude axion-photon couplings for virialized galactic axions down to at the 90% confidence level. The here implemented phase-matching technique also allows for…
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