Speaker
Description
Bulk niobium (Nb) is the standard material for superconducting radiofrequency (SRF) cavities, due to its high critical temperature and high critical magnetic field among pure metals. The performance of these cavities has, in recent years, approached their theoretical limits [1]. The superconductor-insulator-superconductor (SIS) multilayer approach offers
an alternative by using a thin superconducting coating, such as Nb3Sn, with higher critical magnetic field to shield the bulk superconductor from accelerating fields [2].
In our work, we model the SIS multilayer by reducing it to a surface impedance using a first-order Leontovich boundary condition, compatible with finite element methods. We then treat the coating thickness as a Gaussian random field, yielding a spatially inhomogeneous surface impedance. We present the results of a Monte-Carlo simulation
performed on a standard 9-cell 1.3 GHz TESLA cavity [3]. This simulation is used to determine statistical properties of quantities of interest, such as the quality factor, and is repeated for different correlation lengths in the Matérn kernel.
[1] A.-M. Valente-Feliciano, Superconducting RF materials other than bulk niobium: a review, Supercond. Sci. Technol. 29(11) 113002, 2016.
[2] A. Gurevich, Enhancement of rf breakdown field of superconductors by multilayer coating, Appl. Phys. Lett. 88(1) 012511, 2006.
[3] R. Wanzenberg, Monopole, dipole and quadrupole passbands of the TESLA-cell cavity, DESY, 2001.
Funding Agency
BMBF-05H2024
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