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The scan rate of an axion haloscope is proportional to the square of thecavity volume. In this paper, a new class of thin-shell cavities are proposedto search for axionic dark matter. These cavities feature active volume muchlarger (>20X) than that of a conventional cylindrical haloscope, comparablequality factor Q, and a similar frequency tuning range. Full 3D numericalfinite-element analyses have been used to show that the TM_010 eigenmodes aresingly polarized throughout the volume of the cavity and can facilitateaxion-photon conversion in uniform magnetic field produced by a superconductingsolenoid. To mitigate spurious mode crowding and volume loss due tolocalization, a pre-amplification binary summing network will be used forcoupling. Because of the favorable frequency-scaling, the new cavities are mostsuitable for centimeter-wavelength (~ 10-100 GHz), corresponding to thepromising post-inflation axion production window. In this frequency range, thetight machining tolerances required for high-Q thin-shell cavities areachievable with standard machining techniques for near-infrared mirrors.

Large-Volume Centimeter-Wave Cavities for Axion Searches