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Vortex Dynamics and Dissipation under High-Amplitude Microwave Drive

Mattia Checchin* and A. Grassellino

  • Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA

  • *checchin@fnal.gov
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Phys. Rev. Applied 14, 044018 – Published 13 October, 2020

DOI: https://doi.org/10.1103/PhysRevApplied.14.044018

Abstract

In this paper, we describe the vortex dynamics under a high-amplitude microwave drive and its effect on the surface resistance of superconductors. The vortex surface resistance is calculated with a Monte Carlo approach, where the vortex equation of motion 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 the simulations and experiments suggests that the nonlinear dependence of the trapped-flux surface resistance with the microwave field amplitude is generated by progressive microwave depinning and vortex jumps.

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Phys. Rev. Applied 14, 044018– Published 13 October, 2020
  • Received 13 April 2020
  • Revised 4 September 2020
  • Accepted 8 September 2020
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