Speaker
Mohammed Fouaidy
(IPN Orsay)
Description
We derived analytical solutions of the steady-state heat equation for SRF cavities subjected to RF losses and cooled by LHe at temperature Tbath. Two classes of problems are treated: 1) the defect-free case with uniform RF losses either due to the intrinsic BCS RF surface resistance of the material or includes the residual surface resistance Rres, 2) the defect case with losses dominated by RF Joule heating of localized normal-resistive regions or defects. Different thermal models are described and the resulting analytical solutions derived. These solutions are used to study the thermal behaviour of SRF cavities. For the defect-free case, we studied the effect of several parameters on cavity quench field : frequency f, Tbath, Rres, cavity wall thickness, material thermal conductivity k and the heat transfer coefficient at the cavity cold surface. For the defect case, two thermal models are presented and the resulting temperature fields are computed as function of Eacc, k, the defect radius rD and surface resistance RD. The resulting quench fields are then computed. Finally, we propose design criteria in terms of thermal performance for large scale applications of SRF cavities.
Primary author
Mohammed Fouaidy
(IPN Orsay)
