论文标题
测量特斯拉级磁场中的高质量因子超导腔的暗物质搜索
Measurement of high quality factor superconducting cavities in tesla-scale magnetic fields for dark matter searches
论文作者
论文摘要
在使用Axion Haloscopes进行暗物质搜索中，搜索灵敏度取决于浸入多型磁场磁场的质量因子（$ Q_0 $）。增加$ q_0 $将通过关注的参数空间提高扫描速率。开发用于颗粒加速器的超导频腔的研究人员开发了在$ $ $ $ t尺度磁场中获得极高$ q_0 \ sim10^{11} $的方法。在本文中，我们描述了使用用于粒子加速器腔开发的技术开发由NB $ _3 $ SN膜制成的高Q腔的努力。探索了针对此应用的几何优化，并测试了两个空腔：现有的粒子加速器式腔和用于高场中的几何形状和制造的几何形状。质量系数（$ 5.3 \ pm0.3 $）$ \ times 10^5 $以3.9〜GHz的价格获得，在4.2〜k处获得6〜t。
In dark matter searches using axion haloscopes, the search sensitivity depends on the quality factors ($Q_0$) of radiofrequency cavities immersed in multi-tesla magnetic fields. Increasing $Q_0$ would increase the scan rate through the parameter space of interest. Researchers developing superconducting radiofrequency cavities for particle accelerators have developed methods for obtaining extremely high $Q_0\sim10^{11}$ in $μ$T-scale magnetic fields. In this paper, we describe efforts to develop high Q cavities made from Nb$_3$Sn films using a technique developed for particle accelerator cavities. Geometry optimization for this application is explored, and two cavities are tested: an existing particle accelerator-style cavity and a geometry developed and fabricated for use in high fields. A quality factor of ($5.3\pm0.3$)$\times 10^5$ is obtained at 3.9~GHz and 6~T at 4.2~K.
