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Adair, C. M.; Altenmüller, K.; Anastassopoulos, V.; Arguedas Cuendis, S.; Baier, J.; Barth, K.; Belov, A.; Bozicevic, D.; Bräuninger, H.; Cantatore, G.; Caspers, F.; Castel, J. F.; Çetin, S. A.; Chung, W.; Choi, H.; Choi, J.; Dafni, T.; Davenport, M.; Dermenev, A.; Desch, K.; Döbrich, B.; Fischer, H.; Funk, W.; Galan, J.; Gardikiotis, A.; Gninenko, S.; Golm, J.; Hasinoff, M. D.; Hoffmann, D. H. H.; Díez Ibáñez, D.; Irastorza, I. G.; Jakovčić, K.; Kaminski, J.; Karuza, M.; Krieger, C.; Kutlu, Ç.; Lakić, B.; Laurent, J. M.; Lee, J.; Lee, S.; Luzón, G.; Malbrunot, C.; Margalejo, C.; Maroudas, M.; Miceli, L.; Mirallas, H.; Obis, L.; Özbey, A.; Özbozduman, K.; Pivovaroff, M. J.; Rosu, M.; Ruz, J.; Ruiz-Chóliz, E.; Schmidt, S.; Schumann, M.; Semertzidis, Y. K.; Solanki, S. K.; Stewart, L.; Tsagris, I.; Vafeiadis, T.; Vogel, J. K.; Vretenar, M.; Youn, S.; Zioutas, K.
Nature communications, 10/2022, Volume: 13, Issue: 1Journal Article
Abstract The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 μ eV to 22.47 μ 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 g a γ γ = 8 × 10 −14 GeV −1 at the 90% confidence level. The here implemented phase-matching technique also allows for future large-scale upgrades.
