First axion dark matter search with toroidal geometry

Abstract

We firstly report an axion haloscope search with toroidal geometry. In this pioneering search, we exclude the axion-photon coupling $g_{a\gamma \gamma }$ down to about $5\times 10^{-8}$ GeV${}^{-1}$ over the axion mass range from 24.7 to 29.1 $\mu$eV at a 95\% confidence level. The prospects for axion dark matter searches with larger scale toroidal geometry are also considered.

5 pages, 5 figures, 1 table and to appear in PRD-RC

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