Tunable Rectangular Resonant Cavities for Axion Haloscopes

Abstract

Axions are a compelling dark matter candidate, and one of the primary techniques employed to search for them is the axion haloscope, in which a resonant cavity is deployed inside a strong magnetic field so that some of the surrounding axions may convert into photons via the inverse Primakoff effect and become trapped inside the resonator. Resonant cavity design is critical to the sensitivity of a haloscope, and several geometries have been utilised and proposed. Here we consider a relatively simple concept - a rectangular resonant cavity with a tunable wall - and compare it to the standard tuning rod-type resonators employed in the field. We find that the rectangular cavities support similar modes to cylindrical tuning rod cavities, and have some advantages in terms of axion sensitivity and practicality, particularly when moving to higher frequencies which are of great and growing interest in the international axion dark matter community.

arXiv comment9 pages, 7 figures

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Cited by in corpus (5)

• Exclusion of ALP Cogenesis Dark Matter in a Mass Window Above 100 $\mu$eV
• Axion Bounds from Quantum Technology
• Uniform Field in Microwave Cavities Through the Use of Effective Magnetic Walls
• Axions at the meV Crossroads: Theory, Cosmology, Astrophysics, and Experiments
• Split-cavity tuning of a rectangular axion haloscope operating around 8.4 GHz