Conveners
SIS structures for SRF
- Michael Vogel (University of Siegen)
In recent years, the use of alternatives to bulk Nb in the fabrication of SRF cavities, including novel materials and fabrication techniques, have been extensively explored by the SRF community. One of these new methodologies is the use of a superconductor-insulator-superconductor (SIS) multilayer film coating. Typically, these have been envisaged for use with bulk Nb cavities. However, it is...
We are exploring an original approach to improve the performance of bulk Niobium RF cavities through surface engineering with ALD superconducting multilayer capable of screening efficiently the magnetic fields and therefore inhibiting vortices penetration in Niobium SRF cavities [1].
As a first step for the multilayer, we aim at replacing the deleterious niobium native oxide by a clean...
Superconductor-Insulator-Superconductor multilayers improve the performance of SRF cavities providing magnetic screening of the bulk cavity and lower surface resistance.
In this framework NbTiN mixtures stand as a potential material of interest combining the excellent superconducting properties of NbN with the good metallic and structural properties of TiN. One method which enables fine...
We report the growth and multi-technique characterization of stoichiometric Nb3Sn/Al2O3 multilayers with good superconducting and RF properties. We developed an adsorption-controlled growth process by co-sputtering Nb and Sn at high temperatures with a high overpressure of Sn. SIS multilayers with up to 4 Nb3Sn layers of thickness 50-60 nm, separated by 5-6 nm thick Al2O3 interlayers have been...
A.Ö. Sezgin1, M. Vogel1, B.R. Lakki Reddy Venkata1, A. Akter1, X. Jiang1, I. Gonzales Diaz-Palacio2, R. Zierold2
1 University of Siegen, Institute of Materials Engineering, Siegen, Germany
2 University of Hamburg, Center for Hybrid Nanostructures (CHyN), Hamburg, Germany
Keywords: SRF cavities, superconducting NbN thin films, multilayer, SIS, magnetron sputtering
In order to obtain...
