Vortex dynamics and losses due to pinning: Dissipation from trapped magnetic flux in resonant superconducting radio-frequency cavities
| Autor: | James P. Sethna, Alen Senanian, Matthias Liepe, Danilo B. Liarte, Akira Miyazaki, Daniel Hall, Peter Koufalis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Accelerator Physics (physics.acc-ph)
cond-mat.supr-con FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 01 natural sciences Superconductivity (cond-mat.supr-con) Condensed Matter::Superconductivity 0103 physical sciences 010306 general physics physics.acc-ph Physics Accelerator physics Superconductivity Condensed matter physics Condensed Matter - Superconductivity Superconducting radio frequency Dissipation Vorticity 021001 nanoscience & nanotechnology Accelerators and Storage Rings Magnetic flux Magnetic field Vortex Physics - Accelerator Physics 0210 nano-technology |
| Popis: | 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. 15 pages, 8 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|