Yazar "Baier, J." seçeneğine göre listele

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    First results of the CAST-RADES haloscope search for axions at 34.67 mu eV
    (SPRINGER, 2021) Alvarez Melcon, A.; Cuendis, S. Arguedas; Baier, J.; Barth, K.; Braeuninger, H.; Calatroni, S.; Cantatore, G.; Çetin, Serkant Ali
    We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in the 34.67 mu eV mass range. A radio frequency cavity consisting of 5 sub-cavities coupled by inductive irises took physics data inside the CAST dipole magnet for the first time using this filter-like haloscope geometry. An exclusion limit with a 95% credibility level on the axion-photon coupling constant of g(a gamma) greater than or similar to 4 x 10(-13) GeV-1 over a mass range of 34.6738 mu eV < m(a)< 34.6771 mu eV is set. This constitutes a significant improvement over the current strongest limit set by CAST at this mass and is at the same time one of the most sensitive direct searches for an axion dark matter candidate above the mass of 25 mu eV. The results also demonstrate the feasibility of exploring a wider mass range around the value probed by CAST-RADES in this work using similar coherent resonant cavities.
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    Search for dark matter axions with CAST-CAAP
    (NATURE PORTFOLIO, 2022) Adair, C. M.; Altenmuller, K.; Anastassopoulos, V; Cuendis, S. Arguedas; Baier, J.
    The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 mu eV to 22.47 mu 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 gamma gamma) = 8 x 10(-14) GeV-1 at the 90% confidence level. The here implemented phase-matching technique also allows for future large-scale upgrades.