Searching for Low-Mass Axions using Resonant Upconversion

Abstract

We present new results of a room temperature resonant AC haloscope, which searches for axions via photon upconversion. Traditional haloscopes require a strong applied DC magnetic background field surrounding the haloscope cavity resonator, the resonant frequency of which is limited by available bore dimensions. UPLOAD, the UPconversion Low-Noise Oscillator Axion Detection experiment, replaces this DC magnet with a second microwave background resonance within the detector cavity, which upconverts energy from the axion field into the readout mode, accessing axions around the beat frequency of the modes. Furthermore, unlike the DC case, the experiment is sensitive to a newly proposed quantum electromagnetodynamical axion coupling term $g_{aBB}$. Two experimental approaches are outlined - one using frequency metrology, and the other using power detection of a thermal readout mode. The results of the power detection experiment are presented, which allows exclusion of axions of masses between 1.12 $-$ 1.20 $\mu eV$ above a coupling strength of both $g_{a\gamma \gamma }$ and $g_{aBB}$ at $3\times 10^{-6}$ 1/GeV, after a measurement period of 30 days, which is a three order of magnitude improvement over our previous result.

arXiv comment14 pages, 9 figures

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• Comparing Instrument Spectral Sensitivity of Dissimilar Electromagnetic Haloscopes to Axion Dark Matter and High Frequency Gravitational Waves
• Searching for Ultra-Light Axions with Twisted Cavity Resonators of Anyon Rotational Symmetry with Bulk Modes of Non-Zero Helicity
• Physical Signatures of Fermion-Coupled Axion Dark Matter
• Generic axion Maxwell equations: path integral approach
• Searching for GUT-scale QCD Axions and Monopoles with a High Voltage Capacitor
• Microwave Cavity Mode Optimisation by Background Anti-Resonance Tuning
• A Prototype Hybrid Mode Cavity for Heterodyne Axion Detection
• Cavity, lumped-circuit, and spin-based detection of axion dark matter: differences and similarities