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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Near-Quantum-Noise Axion Dark Matter Search at CAPP around 9.5 μeV
Jinsu Kim1,2, Ohjoon Kwon2, Çağlar Kutlu1,2
1Department of Physics, KAIST, Daejeon 34141, Republic of Korea.
Abstract:
We report the results of an axion dark matter search over an axion mass range of 9.39-9.51 μeV. 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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