Speaker
Description
The ORGAN-Q experiment is a dark matter microwave haloscope operated at millikelvin temperatures, featuring a Josephson parametric amplifier. Two simultaneous data streams were recorded during a search for axion dark matter between 6.15--6.35 GHz (25.45--26.27 $\mu$eV). The standard halo model axion search yielded the leading axion--photon exclusion limits across this interval. We report the analysis of the additional sub-hertz resolution stream intended to resolve exceptionally narrow signals, extending the ORGAN-Q search to cold, low-dispersion axion flows. The analysis combines noise-statistics quality control and background removal with time-dependent Doppler tracking and persistence-based candidate selection.
At higher axion masses, challenges of decreased sensitivity arise due to smaller resonator volumes. We investigate combining multiple small resonant volumes without relying solely on aperture coupling. Thin conducting films offer a possible distributed coupling interface between adjacent cavities. Initially developed for a three-resonator system intended for different tests of fundamental physics, a mutual resistance term models the observed coupling behaviour. We use this experimentally grounded framework to investigate constructive operating conditions and shared-readout configurations for multi-cavity axion haloscopes. This work connects the near-term interpretation of ORGAN-Q high-resolution data with a potential route for scaling future high-mass axion detectors.
| Primary Abstract Topic | Experiment: Axions and Wave-Like-DM |
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