doi:10.1103/PhysRevD.111.043024engReina-Valero, JoséNavarro-Madrid, Jose R.Blas, DiegoDíaz-Morcillo, AlejandroGarcía Irastorza, IgorGimeno, BenitoMonzó-Cabrera, JuanHigh-frequency gravitational waves detection with the BabyIAXO haloscopesART-2025-143027We present the first analysis using RADES-BabyIAXO cavities as detectors of high-frequency gravitational waves (HFGWs). In particular, we discuss two configurations for distinct frequency ranges of HFGWs: cavity 1, mostly sensitive at a frequency range of 252.8–333.2 MHz, and cavity 2, at 2.504–3.402 GHz, which is a scaled down version of cavity 1. We find that cavity 1 will reach sensitivity to strains of the HFGWs of order h1∼10−21, while cavity 2 will reach h2∼10−20. These represent the best estimations of the RADES-BabyIAXO cavities as HFGW detectors, showing how this setup can produce groundbreaking results in axion physics and HFGWs simultaneously.2025http://zaguan.unizar.es/record/15122810.1103/PhysRevD.111.043024http://zaguan.unizar.es/record/151228oai:zaguan.unizar.es:151228info:eu-repo/grantAgreement/ES/AEI/PID2020-115845GB-I00info:eu-repo/grantAgreement/EUR/ERC-2017-AdG-788781info:eu-repo/grantAgreement/ES/MICIU/PID2022-137268NA-C55info:eu-repo/grantAgreement/ES/MICIU/PID2022-137268NB-C53Physical Review D 111, 4 (2025), 043024 [13 pp.]byhttps://creativecommons.org/licenses/by/4.0/deed.esinfo:eu-repo/semantics/openAccess