Status of DMRadio-50L and DMRadio-m${}^3$

Abstract

Recent theoretical advancements have made the QCD axion a stronger dark matter candidate, especially in the sub-$\mu \text{eV}$ range. While cavity haloscopes have made significant progress in excluding QCD axions in the $1-100\mu \text{eV}$ region, the $1\text{ peV}-1\mu \text{eV}$ region remains unexplored. The DMRadio program consists of a series of experiments designed to probe low mass axions. DMRadio-50L uses a 1 T average field toroidal magnet and a high-Q LC-oscillator with target sensitivity to axions of $g_{a\gamma \gamma }<5\times 10^{-15}{\text{ GeV}}^{-1}$ between 5 kHz and 5 MHz. DMRadio-m${}^3$ consists of a higher frequency LC-oscillator in a 4 T peak field solenoidal magnet with sensitivity to the DFSZ model of QCD axions between 30 MHz and 200 MHz. In this work, we present the status of DMRadio-50L and DMRadio-m${}^3$.

Comments: 8 pages, 2 figures. v2: minor edits following reviewer comments