Nb体材料纳米尺度非线性射频特性：非本征非线性效应的起源
Nanoscale Nonlinear Radio Frequency Properties of Bulk Nb : Origins of Extrinsic Nonlinear Effects
摘要：
铌基超导射频（SRF）粒子加速器腔的性能对局部缺陷敏感，这些缺陷在高加速梯度下引起失超。为了确定这些材料的缺陷，在其工作频率和温度下的散装铌表面，宽带微波显微镜与本地化和强RF磁场的开发，通过将磁写入头到近场微波显微镜，使映射的本地电动力学响应在多GHz的频率制度在低温温度。该磁记录器在体铌表面显示出局域的强RF磁场，其$B_{surface}$ > 102 mT，分辨率为亚微米。通过测量超导体的非线性响应，证明了非线性来自于纳米级弱连接约瑟夫森结，由于在腔的制造过程中的污染表面。
英文摘要：
The performance of Niobium-based Superconducting Radio Frequency (SRF) particle accelerator cavities can be sensitive to localized defects that give rise to quenches at high accelerating gradients. In order to identify these material defects on bulk Nb surfaces at their operating frequency and temperature, a wide bandwidth microwave microscope with localized and strong RF magnetic fields is developed by integrating a magnetic write head into the near-field microwave microscope to enable mapping of the local electrodynamic response in the multi-GHz frequency regime at cryogenic temperatures. This magnetic writer demonstrates a localized and strong RF magnetic field on bulk Nb surface with $B_{surface}$ > 102 mT and sub-micron resolution. By measuring the nonlinear response of the superconductor, nonlinearity coming from the nano-scale weak link Josephson junctions due to the contaminated surface in the cavity fabrication process is demonstrated.
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