论文标题
超导射频腔中由于杂质概况而引起的高场Q斜率缓解措施
High-Field Q-slope Mitigation due to Impurity Profile in Superconducting Radio-Frequency Cavities
论文作者
论文摘要
在这项研究中，我们介绍了超导射频腔中高场Q斜坡的起源的新见解。因此，使用氢氟酸冲洗液用于探测射频性能，这是通过低温氮输注制备的两个超导大量的卵子腔的材料去除的函数。该研究表明，氮输注仅影响天然氧化物层以下的前几个纳米。在十二种氢氟酸冲洗液后，电抛光腔的典型高场Q斜率行为确实得到了完全回收。高场Q斜坡作为材料去除的函数的重新出现是通过伦敦对超导体中筛选电流的局部描述进行建模的，返回了实验数据的良好拟合，并表明间质杂质层具有与纳米纳米量的TENS延伸长度扩散到纳米纳米量的均可减轻高层Q-Slope。
In this study, we present new insights on the origin of the high-field Q-slope in superconducting radio-frequency cavities. Consequent hydrofluoric acid rinses are used to probe the radio-frequency performance as a function of the material removal of two superconducting bulk niobium cavities prepared with low temperature nitrogen infusion. The study reveals that nitrogen infusion affects only the first few tens of nanometers below the native oxide layer. The typical high-field Q-slope behavior of electropolished cavities is indeed completely recovered after a dozen hydrofluoric acid rinses. The reappearance of the high-field Q-slope as a function of material removal was modeled by means of London's local description of screening currents in the superconductor, returning good fitting of the experimental data and suggesting that interstitial impurities layers with diffusion length of the order to tens of nanometers can mitigate high-field Q-slope.
