SQUID-Based Microwave Cavity Search for Dark-Matter Axions
S. J. Asztalos, G. Carosi, C. Hagmann, D. Kinion, K. van Bibber, M. Hotz, L. J Rosenberg, G. Rybka, J. Hoskins, J. Hwang, P. Sikivie, D. B. Tanner, R. Bradley, J. Clarke
DOI 10.1103/PhysRevLett.104.041301 · Physical Review Letters
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Abstract
Axions in the μeV 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. We report the first result from such an axion search using a superconducting first-stage amplifier (SQUID) replacing a conventional GaAs field-effect transistor amplifier. This experiment excludes KSVZ dark-matter axions with masses between 3.3 μeV and 3.53 μeV and sets the stage for a definitive axion search utilizing near quantum-limited SQUID amplifiers.
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