Near-Quantum-Noise Axion Dark Matter Search at CAPP around 9.5 $\mu$eV

Abstract

We report the results of an axion dark matter search over an axion mass range of 9.39-9.51 $\mu$eV. A flux-driven Josephson parametric amplifier (JPA) was added to the cryogenic receiver chain. A system noise temperature of as low as 200 mK was achieved, which is the lowest recorded noise among published axion cavity experiments with phase-insensitive JPA operation. In addition, we developed a two-stage scanning method which boosted the scan speed by 26%. As a result, a range of two-photon coupling in a plausible model for the QCD axion was excluded with an order of magnitude higher in sensitivity than existing limits.

6 pages, 4 figures

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