A SQUID-based microwave cavity search for dark-matter axions
The ADMX Collaboration: S. J. Asztalos, G. Carosi, C. Hagmann, D., Kinion, K. van Bibber, M. Hotz, L. Rosenberg, G. Rybka, J. Hoskins, J. Hwang,, P. Sikivie, D. B. Tanner, R. Bradley, J. Clarke
TL;DR
This paper reports the first axion search using a SQUID-based microwave cavity detector, achieving sensitivity in the relevant axion-photon coupling range and paving the way for more sensitive future searches.
Contribution
It introduces a superconducting SQUID amplifier in axion detection, demonstrating improved sensitivity over conventional amplifiers in microwave cavity experiments.
Findings
Achieved axion-photon coupling sensitivity within theoretical models
Successfully replaced conventional amplifiers with SQUIDs
Set the stage for near quantum-limited axion searches
Abstract
Axions in the micro eV mass range are a plausible cold dark matter candidate and may be detected by their conversion into microwave photons in a resonant cavity immersed in a static magnetic field. The first result from such an axion search using a superconducting first-stage amplifier (SQUID) is reported. The SQUID amplifier, replacing a conventional GaAs field-effect transistor amplifier, successfully reached axion-photon coupling sensitivity in the band set by present axion models and sets the stage for a definitive axion search utilizing near quantum-limited SQUID amplifiers.
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