This report demonstrates resonant conversion techniques in strong magnetic fields to probe dark matter candidates in the SUPAX experiment, indicating potential for new discoveries.
The SUPerconduction AXion search experiment (Supax) is a haloscope designed to probe axion-like particles (ALPs) as candidates for dark matter and solutions to the strong CP problem. ALPs are predicted to couple to photons, allowing their detection through resonant conversion in electromagnetic cavities placed within strong magnetic fields. employs a 12 T magnetic field and tunable superconducting cavities with resonance frequencies ranging from 2\,GHz to 7.2\,GHz, enabling the exploration of axion masses between 8\,μeV and 30\,μeV. The tuning mechanism, based on piezo motors and gas-pressure regulation, allows for simultaneous scanning of up to three frequencies, significantly improving search efficiency. This paper presents the technical design of the Supax experiment, preliminary R&D efforts, and results from prototype experiments. In particular, we exclude dark photons with masses around 35\,μeV with a kinetic mixing parameter χ > 5· 10⁻¹⁴, i.e. a region of parameter space which has not been previously explored.
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Chouhan et al. (2025) studied this question.
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