Near-Quantum-Noise Axion Dark Matter Search at CAPP around 9.5 mu eV
Physical review letters(2023)
摘要
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.
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