In order to minimize the surface resistance in superconducting cavities, a deeper understanding of residual resistance due to trapped magnetic flux is necessary. For that purpose, a combined temperature and magnetic field mapping system is employed to map magnetic flux trapped in a superconducting cavity, and the related increase in surface resistance. By cooling down a 1.3 GHz TESLA single cell cavity several times with externally applied static magnetic fields with different orientations with respect to the cavity, a statement can be made about how the angle between the applied magnetic field and the cavity’s surface affects flux trapping, and surface resistance. For example, a significantly higher increase in surface resistance is observed when the applied magnetic field is perpendicular to the cavity’s surface compared to when it is parallel.

中文翻译：

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几何形状对超导腔中通量陷阱和相关表面电阻的影响

为了最小化超导腔中的表面电阻，需要对由于捕获的磁通量而引起的残余电阻有更深入的了解。为此，采用了温度和磁场组合测绘系统来测绘捕获在超导腔中的磁通量，并相应地增加了表面电阻。通过用相对于空腔不同方向的外部施加的静磁场将1.3 GHz TESLA单电池空腔冷却几次，可以说明施加的磁场和空腔表面之间的角度如何影响磁通量捕获，以及表面电阻。例如，当所施加的磁场垂直于腔体表面时，与平行时相比，观察到的表面电阻明显更高。