论文标题
CAPP上的近量子 - 噪声轴线暗物质搜索大约9.5美元$ $ $ ev
Near-Quantum-Noise Axion Dark Matter Search at CAPP around 9.5 $μ$eV
论文作者
论文摘要
我们报告了斧头暗物质搜索的结果，轴质量范围为9.39-9.51 $μ$ EV。将通量驱动的约瑟夫森参数放大器（JPA）添加到低温接收器链中。实现了最低200 MK的系统噪声温度，这是具有相敏感JPA操作的已发表的轴突腔实验中记录的最低噪声。此外，我们开发了一种两阶段的扫描方法，该方法将扫描速度提高了26％。结果，排除了QCD轴的合理模型中的一系列两光子耦合范围，其灵敏度的数量级高于现有限制。
We report the results of an axion dark matter search over an axion mass range of 9.39-9.51 $μ$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.
