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
