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The haloscope is one of the most sensitive approaches to the QCD axionphysics within the region where the axion is considered to be a dark mattercandidate. Current experimental sensitivities, which rely on the lowestfundamental TM010 mode of a cylindrical cavity, are limited to relatively lowmass regions. Exploiting higher-order resonant modes would be beneficialbecause it will enable us to extend the search range with no volume loss andhigher quality factors. This approach has been discarded mainly because of thesignificant degradation of form factor, and difficulty with frequency tuning.Here we introduce a new tuning mechanism concept which both enhances the formfactor and yields reasonable frequency tunability. A proof of conceptdemonstration verified that this design is feasible for high mass axion searchexperiments.

Exploiting higher-order resonant modes for axion haloscopes