论文标题
高磁场中超导微波谐振器中表面损失的多模式分析
Multi-mode Analysis of Surface Losses in a Superconducting Microwave Resonator in High Magnetic Fields
论文作者
论文摘要
本文报告了磁场中niobium Titanium超导射频（SRF）腔的表面阻抗测量值（最高$ 10 \，{\ rm T} $）。采用一种新颖的方法来分解圆柱腔端盖和墙壁的表面电阻贡献，并使用来自多个$ tm $腔模式的测量值。结果证实，高磁场中NBTI SRF腔的质量因子降解主要来自垂直于该场的表面（腔端盖），而平行的表面电阻（壁）保持相对恒定。对于需要在强磁场（例如轴线暗物质实验（ADMX））中需要高Q腔的应用，该结果令人鼓舞，因为它打开了混合SRF腔构造以取代常规铜腔的可能性。
This paper reports on a surface impedance measurement of a niobium titanium superconducting radio frequency (SRF) cavity in a magnetic field (up to $10\,{\rm T}$). A novel method is employed to decompose the surface resistance contributions of the cylindrical cavity end caps and walls using measurements from multiple $TM$ cavity modes. The results confirm that quality factor degradation of a NbTi SRF cavity in a high magnetic field is primarily from surfaces perpendicular to the field (the cavity end caps), while parallel surface resistances (the walls) remain relatively constant. This result is encouraging for applications needing high Q cavities in strong magnetic fields, such as the Axion Dark Matter eXperiment (ADMX), because it opens the possibility of hybrid SRF cavity construction to replace conventional copper cavities.
