论文标题
高振幅微波驱动器下的涡流动力学和耗散
Vortex Dynamics and Dissipation Under High-amplitude Microwave Drive
论文作者
论文摘要
在本文中，我们描述了高振幅微波驱动器下的涡流动力学及其对超导体表面电阻的影响。涡流表面电阻是通过Montecarlo方法计算的，其中求解了涡流运动方程，以集合在随机固定景观中振荡的每个振荡线的集合。这种方法能够提供微观涡流动力学的详细描述，进而对涡流表面电阻的微波场幅度依赖性进行重要见解。将数值模拟与高微波幅度的涡流表面电阻的实验数据进行了比较，该振幅通过大量的Niobium Superconducting-Radio频率腔测量，在1.3 GHz处运行。模拟和实验的良好定性一致性表明，捕获的磁通表面电阻与微波场振幅的非线性依赖性是由渐进的微波炉和涡流跳跃产生的。
In this paper, we describe the vortex dynamics under high-amplitude microwave drive and its effect on the surface resistance of superconductors. The vortex surface resistance is calculated with a Montecarlo approach, where the vortex motion equation is solved for a collection of vortex flux lines each oscillating within a random pinning landscape. This approach is capable of providing a detailed description of the microscopic vortex dynamics and in turn important insights into the microwave field amplitude dependence of the vortex surface resistance. The numerical simulations are compared against experimental data of vortex surface resistance at high microwave amplitude measured by means of bulk niobium superconducting-radio frequency cavities operating at 1.3 GHz. The good qualitative agreement of simulations and experiments suggests that the non-linear dependence of the trapped flux surface resistance with the microwave field amplitude is generated by progressive microwave depinning and vortex jumps.
