Nov 8 – 9, 2018
CERN
Europe/Zurich timezone

A simple model for the RF field dependence of the trapped flux sensitivity based on a non-linear pinning force

Nov 9, 2018, 11:42 AM
17m
513/1-024 (CERN)

513/1-024

CERN

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Speaker

Ruggero Vaglio (1950)

Description

The improvement of the performance of RF superconducting cavities has recently motivated a considerable research effort to elucidate the effect of trapped magnetic flux on the surface resistance . In this paper we show that by introducing a non-linear pinning force in the Gittleman-Rosenblum equations for the RF power dissipation due to a trapped magnetic flux in a superconductor, we can properly describe the linear dependence of the additional surface resistance on the RF field amplitude . In particular, we also show that the proportionality between the RF-field dependent and independent parts and , and the frequency dependence of follow naturally from this approach

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