Nov 8 – 9, 2018
CERN
Europe/Zurich timezone

Trapped flux sensitivity in the low amplitude radio-frequency regime

Nov 9, 2018, 11:25 AM
17m
30/7-018 - Kjell Johnsen Auditorium (CERN)

30/7-018 - Kjell Johnsen Auditorium

CERN

25
Show room on map

Speaker

Dr Mattia Checchin (FNAL)

Description

In this study, the radio-frequency complex response of trapped vortices in superconductors calculated for small values of applied radio-frequency field, will be presented. In agreement with experimental data on bulk niobium radio-frequency cavities, the calculated surface resistance shows a non-monotonic trend as a function of the mean-free-path and a sigmoidal-like trend as a function of the frequency. These two trends are shown to be generated by the interplay of two different dissipation regimes - pinning and flux-flow - which can be tuned either by acting on the material parameters (mean-free-path, pinning sites configuration, pinning strength, coherence length and penetration depth) or on the resonator frequency.

Presentation materials