We first 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 $5\times {10}^{-8}{\mathrm{GeV}}^{-1}$ over the axion mass range from 24.7 to $29.1\mu \mathrm{eV}$ at a 95% confidence level. The prospects for axion dark matter searches with larger scale toroidal geometry are also considered.

• Received 26 April 2017

DOI:https://doi.org/10.1103/PhysRevD.96.061102