Speaker
Description
It is widely accepted that for further improvement in cavity RF performance, innovation is needed and one may have to turn to other forms of Nb and to other superconducting materials. The potential benefits of using materials other than Nb would be a higher Tc, a potentially higher critical field Hc, leading to potentially significant cryogenics cost reduction if the cavity operation temperature is 4.2 K or higher. Achieving higher accelerating gradient will reduce the overall length of the accelerator and hence shorter tunnel. In Superconducting Cavity made of Niobium only the very few microns of the internal surface layer is important and the rest of the bulk is used as the support. Copper is a much better heat conductor than Nb, so using copper as the support and having several layers of Nb or multilayer of Superconductor/insulator/Superconductor will bring the cost down considerably. Other materials known as A15, such as Nb3Sn or V3Si and B1 such as NbTiN and NbN are much easier to synthesise in thin films rather than being made as bulk cavity.
We report on optimised deposition parameters for successfully synthesising the alternative superconducting thin film with high superconducting properties (Tc and Hsh) on flat substrates samples in single and multi-layer. The dependence of superconducting properties of the total structure on deposition parameters is been determined. The films have been characterized via SEM, EDS, TEM, XRD, RBS,and SQUID magnetometer.
