Tikhonov, D.; Keckert, S.; Knobloch, J.; Kugeler, O.; Leith, S.; Vogel, M.; Pira, C.; Chyhyrynets, E.: Investigation of SIS Multilayer Films at HZB. In: Kenji Saito ... [Ed.] : SRF2021 : Proceedings of the 20th International Conference on RF Superconductivity, virtuell, 27 June 2021 to 2 July 2021Geneva: JACoW, 2022. - ISBN 978-3-95450-233-2, p. SUPFDV006/1-5
Open Access Version
Abstract:
The systematic study of multilayer SIS films (Supercon-ductor-Insulator-Superconductor) is being conducted in Helmholtz-Zentrum Berlin. Such films theoretically should boost the performance of superconducting cavities, and reduce some problems related to bulk Nb such as mag-netic flux trapping. Up to now such films have been pre-sented in theory, but the RF performance of those structures has not been widely studied. In this contribution we present the results of the latest tests of AlN-NbN films, deposited on micrometer-thick Nb layers on copper. It has, also, been shown previously at HZB that such SIS films may show some unexpected behaviour in surface resistance versus temperature parameter space. In this contribution we con-tinue to investigate those effects with the variation of dif-ferent parameters of films (such as insulator thickness) and production recipes.