DMRadio-GUT: A Future Search for GUT-Scale QCD Axion Dark Matter, Status and Plans

I will discuss DMRadio-GUT, an ambitious, long-term effort to probe the axion-photon coupling in the 400 peV-125 neV mass range, with sensitivity to GUT-scale QCD axion models. DMRadio-GUT will leverage techniques developed for the preceding DMRadio-50L and DMRadio-m³ searches. I overview progress and needs in research and development for high-field, large volume superconducting magnets, high-Q superconducting lumped-element resonators, and quantum metrology in the kHz and MHz frequency ranges. Development of these technologies will enable a search for GUT-scale axion dark matter with DMRadio-GUT.