The frequency band 1-15 GHz provides exciting prospects for resonant axion haloscopes as indicated by cosmological and astrophysical arguments. Among the challenges currently addressed to reach the required sensitivity, the development of high quality factor cavities that tolerate multi-Tesla fields plays a central role. We report a 3D resonator based on a right circular copper cavity with hollow cylinders that confine higher order modes around the cylinder axis. Its effective volume at 10.3\,GHz is 3.4⋅10−2 liters, and under an 8\,T-field we measured an internal quality factor of more than 9 millions. These parameters demonstrate the potential of this unique resonator to probe galactic dark matter axion at remarkable scan rates of 15\,MHz/day when the cavity is readout by a quantum-limited receiver.
@article{arxiv.2201.04223,
title = {A high-Q microwave dielectric resonator for axion dark matter haloscopes},
author = {R. Di Vora and D. Alesini and C. Braggio and G. Carugno and N. Crescini and D. D Agostino and D. Di Gioacchino and P. Falferi and U. Gambardella and C. Gatti and G. Iannone and C. Ligi and A. Lombardi and G. Maccarrone and A. Ortolan and R. Pengo and A. Rettaroli and G. Ruoso and L. Taffarello and S. Tocci},
journal= {arXiv preprint arXiv:2201.04223},
year = {2022}
}