AI 中文总结
研发宽调谐光子带隙腔 haloscope，利用其高 Q 值与快调谐速度，在 10.25-10.45 GHz 范围搜寻轴子暗物质，将轴子-光子耦合约束至 1×10⁻¹² GeV⁻¹，为 QCD 轴子搜寻奠基。
AI 中文摘要
我们报告了一种新型宽调谐腔的研发及其在轴子暗物质搜寻中的应用。我们采用同心蓝宝石壳降低腔筒的欧姆损耗，实现了空载品质因数超过 $10^5$，约为相同频率下裸铜腔的 25 倍。旋转蓝宝石棒可将腔模在 10.1-11.7 GHz 范围内调谐，调谐范围约为谐振频率的 16%。结合放大接收链，我们在 10.25-10.45 GHz（对应 42.4-43.2 μeV）的 200 MHz 范围内调谐腔，证明了对新轴子参数空间的灵敏度，将轴子-光子耦合常数约束为 $|g_{a\beta\beta}|$ ≤ 1×$10^{-12}$ GeV⁻¹。当与光子计数装置配对时，该腔的调谐扫描速度约为裸铜腔的 9 倍，为在 10.1-11.7 GHz 范围内开展 QCD 轴子的确定性搜寻奠定了基础。
英文摘要
We report the development of a new widely tunable cavity and demonstrate its use in a search for dark matter axions. We achieve unloaded quality factors above $10^{5}$, roughly $25\times$ larger than a bare copper cavity at the same frequency, using concentric sapphire shells to reduce Ohmic losses on the cavity barrel. A rotating sapphire rod tunes our cavity mode over the $10.1-11.7$ GHz range, approximately $16\%$ of its resonant frequency. Using an amplified receiver chain, we demonstrate sensitivity to new axion parameter space by tuning the cavity over the $200$ MHz range between $10.25-10.45$ GHz (42.4 - 43.2, $μ$eV) to constrain the axion-to-photon coupling to $|g_{aγγ}|$ $\leq$ 1 $\times$ $10^{-12}$ ${GeV}^{-1}$. This cavity can scan its tuning range about $9$ times faster compared to a bare copper cavity when paired with a photon counting device, laying the groundwork for a definitive search for the QCD axion over $10.1-11.7$ GHz.
