Description
We present the status and plans of The Oscillating Resonant Group AxioN (ORGAN) Collaboration, which develops microwave cavity axion haloscopes to search for dark matter. ORGAN is a nation wide collaboration, with the main experiment hosted at The University of Western Australia.
Axions are a leading dark matter candidate. Axion haloscopes are a class of experiments which search for axion dark matter using electromagnetic resonant cavities submerged in magnetic fields.
The main ORGAN Experiment is a high mass haloscope (~60-200 micro-eV) broken down into various phases, having commenced data-taking in 2021. Phase 1 recently concluded, excluding ALP Cogenesis models of dark matter in the relevant mass ranges along with scalar dark matter and dark photon limits. Phase 2 is in research and development, expected to commence in late 2026 and achieve deeper sensitivity. Active avenues of research and development for ORGAN Phase 2 include novel high frequency cavity design, superconducting materials, and single photon counting – we will report on the status of R&D in these areas.
ORGAN-Q is a pathfinder experiment (~25 micro-eV), designed as a testbed for various techniques to be integrated into the main ORGAN Experiment in Phase 2, such as quantum enhances amplification, and other improvements. The first ORGAN-Q run concluded in 2024, and we are currently in preparation for the next run which plans to implement various design improvements, including squeezed state receiving.
ORGAN-Low Frequency is a lower-mass experiment designed to utilise an MRI magnet, and novel re-entrant cavities to push into the low frequency regime, and search for different models of dark matter. It completed its path-finding run in 2026, and is currently in development for full-scale deployment.
We will summarize each experiment in terms of the relevant experimental details, current status, run plans, and projected reach.
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