The SUPerconduction AXion search experiment (Supax) is a future haloscope-type detector designed to probe axion-like particles (ALPs) as candidates for dark matter and solutions to the strong-CP problem in the mass range between 8μeV and 30μeV. In the course of the preparation of Supax, a prototype experiment was built and operated. Using a copper cavity, cooled down to a temperature of 2 K and operated in a magnetic field of 12 T, we probe axion masses around 34μeV and exclude axion-photon couplings down to ∣gaγγ∣>1.6⋅10−13GeV−1. The data was also used to exclude dark photons in the same mass range with a kinetic mixing parameter of χ>1.4⋅10−12. Details of the experimental setup and the analysis strategy are summarized in this paper.
@article{arxiv.2603.10943,
title = {First Axion Search Results of the SUPAX Prototype Experiment},
author = {Tim Schneemann and Hendrik Bekker and Dmitry Budker and Kristof Schmieden and Matthias Schott and Malavika Unni and Arne Wickenbrock},
journal= {arXiv preprint arXiv:2603.10943},
year = {2026}
}