UPLOAD-ANYON：用于超轻轴子暗物质搜寻的、具备高灵敏度振幅调制（AM）噪声检测的优化扭曲任意子腔的研究进展
UPLOAD-HELIX: High-Helicity Single-Mode Microwave Haloscope with Low-Noise Interferometric Readout for Ultralight Axion Dark Matter
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中文总结 AI 辅助
本研究基于超导铌的逆设计框架优化螺旋腔谐振器，开发出高灵敏度AM噪声检测的扭曲任意子腔，其品质因数较基准提升三个数量级，三个月采集时间可在超轻轴子质量范围实现超当前CAST限一个量级的探测灵敏度。
中文摘要 AI 辅助
我们提出了一种基于螺旋腔谐振器的超导单模微波 haloscope（微波 haloscope，用于轴子暗物质探测的微波谐振装置），用于探测质量范围为$10^{-18}$至$10^{-13}\\\\,mathrm{eV}$的超轻暗物质轴子。基于Bourhill等人提出的单模螺旋腔概念[Phys. Rev. D 108, 052014 (2023); arXiv:2208.01640]，我们采用逆设计框架开发了与超导铌加工兼容的实用谐振器几何结构。优化过程使用了一个品质因数，该因数旨在最小化达到固定实验灵敏度所需的测量时间。相较于启发式莫比乌斯几何基准，可减法制造的最佳块状铌设计的品质因数提高了三个数量级以上。结合实测电子噪声和泵浦振幅噪声主动抑制的实验信息微波干涉读出模型，被用于预估所提实验的灵敏度。对于三个月的采集时间，该 haloscope 预计可在轴子质量超过四个数量级的范围内达到$g_{a\gamma\gamma}<10^{-11}\\\\,mathrm{GeV}^{-1}$，其预估灵敏度比当前CAST设定的排除限低约一个数量级，为高灵敏度直接搜寻超轻暗物质轴子提供了实用途径。
英文摘要
We propose a superconducting single-mode microwave haloscope based on chiral cavity resonators for the detection of ultralight dark matter axions over the mass range $4\times10^{-19}$-$~4\times10^{-14}\,\mathrm{eV}$. Building on the single-mode chiral-cavity concept introduced by Bourhill et al. [Phys. Rev. D 108, 052014 (2023); arXiv:2208.01640], we develop a resonator geometry compatible with subtractive manufacturing from high-purity bulk niobium, taking advantage of the substantially lower surface resistance achievable relative to the additively manufactured Möbius cavity proposed in the earlier work. An inverse-design framework is then used to maximise a figure of merit derived to minimise the measurement time required to achieve a fixed experimental sensitivity. The resulting optimised bulk-niobium design achieves a figure of merit more than three orders of magnitude larger than the additively manufactured Mobius benchmark. An experimentally informed microwave interferometric readout model, incorporating measured electronics noise and active suppression of pump amplitude noise, is used to project the sensitivity of the proposed experiment. For an acquisition time of three months, the haloscope is projected to reach $g_{aγγ}<10^{-11}\,\mathrm{GeV}^{-1}$ across more than four orders of magnitude in axion mass. The projected sensitivity extends approximately one order of magnitude below the current exclusion limits set by CAST, providing a practical pathway towards a high-sensitivity direct search for ultralight dark matter axions.
发表机构
- The University of Western Australia（西澳大学）
- Thomas Jefferson National Accelerator Facility（托马斯·杰斐逊国家加速器设施）
- University of Birmingham（伯明翰大学）
- Selçuk University（塞尔丘克大学）
机构由 AI 辅助整理，请以论文原文为准。
