Vortex Dynamics and Losses Due to Pinning: Dissipation from Trapped Magnetic Flux in Resonant Superconducting Radio-Frequency Cavities
Vortex Dynamics and Losses Due to Pinning: Dissipation from Trapped Magnetic Flux in Resonant Superconducting Radio-Frequency Cavities
复制标题
涡流动力学和钉扎引起的损耗：谐振超导射频腔中捕获磁通量的耗散
DOI：
10.1103/physrevapplied.10.054057
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发表时间：
2018
影响因子：
4.6
通讯作者：
J. Sethna
中科院分区：
文献类型：
--
作者：
D. Liarte;D. Hall;P. Koufalis;A. Miyazaki;Alen Senanian;M. Liepe;J. Sethna
本文利用涡旋动力学模型和集体弱钉扎理论研究了脏超导体中俘获磁通的剩余耗散。使用简单的估计，近似的分析计算和数值模拟，我们作出预测和比较与实验进行的CERN和康奈尔大学的共振超导射频NbCu，掺杂Nb和Nb$_3$Sn腔。我们调用滞后损失起源于一个崎岖的钉扎电位景观来解释的线性行为的剩余电阻的灵敏度被困磁通量的射频场的振幅的函数。我们的计算还预测和描述了从滞后为主的粘性为主的耗散制度的交叉。我们提出了简单的公式描述功率损耗和交叉行为，这可以用来指导材料参数的调整，以优化腔的性能。
We use a model of vortex dynamics and collective weak pinning theory to study the residual dissipation due to trapped magnetic flux in a dirty superconductor. Using simple estimates, approximate analytical calculations, and numerical simulations, we make predictions and comparisons with experiments performed in CERN and Cornell on resonant superconducting radio-frequency NbCu, doped-Nb and Nb$_3$Sn cavities. We invoke hysteretic losses originating in a rugged pinning potential landscape to explain the linear behavior of the sensitivity of the residual resistance to trapped magnetic flux as a function of the amplitude of the radio-frequency field. Our calculations also predict and describe the crossover from hysteretic-dominated to viscous-dominated regimes of dissipation. We propose simple formulas describing power losses and crossover behavior, which can be used to guide the tuning of material parameters to optimize cavity performance.
SRF 腔中俘获磁通灵敏度的频率依赖性
影响因子：
4
作者：
Checchin, M.;Martinello, M.;Grassellino, A.;Aderhold, S.;Chandrasekaran, S. K.;Melnychuk, O. S.;Posen, S.;Romanenko, A.;Sergatskov, D. A.
通讯作者：
Sergatskov, D. A.