TY - CONF AU - Benjamin, C. AU - Burt, G. AU - Conlon, J.A. AU - Leicester, N.L. AU - Malyshev, O.B. AU - Marks, H.S. AU - Seal, D.J. AU - Smith, L.G.P. AU - Valizadeh, R. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Deposition and Characterisation of V₃Si films for SRF Applications J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - A15 superconducting materials, like V₃Si and Nb₃Sn, are potential alternatives to Nb for next generation thin film SRF cavities when operated at 4 K. Their relatively high Tc and superconducting properties could allow for higher accelerating gradients and elevated operating temperatures. We present work on the deposition of V₃Si thin films on planar Cu substrates and an open structure 6 GHz cavity, using physical vapour deposition (PVD) and a V₃Si single target. The surface structure, composition and DC superconducting properties of two planar samples were characterised via secondary electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX) and in a magnetic field penetration facility. Furthermore, the first deposition using PVD of a V₃Si film on a 6 GHz split cavity and the RF performance is presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 84 EP - 87 KW - cavity KW - SRF KW - site KW - target KW - vacuum DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-MOPMB011 UR - https://jacow.org/srf2023/papers/mopmb011.pdf ER - TY - CONF AU - Smith, L.G.P. AU - Burt, G. AU - Junginger, T. AU - Malyshev, O.B. AU - Turner, D.A. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Investigation, Using Nb Foils to Characterise the Optimal Dimensions of Samples Measured by the Magnetic Field Penetration Facility J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - SRF cavities made of bulk Nb are reaching their theoretical limits in the maximum accelerating gradient, E_{acc}, where E_{acc} is limited by the maximum magnetic field, Bmax, that can be applied on the surface of the accelerating cavity wall. To increase E_{acc}, Bmax, which can be applied to the surface, must also be increased. The A15 materials or multilayer structures are the potential solution to increase Bmax. Since coating and RF testing of full size RF cavities is both expensive and time consuming, one need to evaluate new ideas in superconducting thin films quickly and at low cost. A magnetic field penetration experiment has been designed and built at Daresbury Laboratory to test small superconducting samples. The facility produces a parallel DC magnetic field, which applied from one side of the sample to the other similar to that in an RF cavity. The facility applies an increasing magnetic field at a set temperature to determine the field of full flux penetration which can give an insight into the quality and structure of the superconducting structure. The facility has been characterised using both type I and II superconductors and is now producing results from novel materials. PB - JACoW Publishing CP - Geneva, Switzerland SP - 88 EP - 91 KW - cavity KW - SRF KW - experiment KW - ECR KW - niobium DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-MOPMB012 UR - https://jacow.org/srf2023/papers/mopmb012.pdf ER - TY - CONF AU - Seal, D.J. AU - Burt, G. AU - Conlon, J.A. AU - Malyshev, O.B. AU - Morrow, K.T. AU - Valizadeh, R. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Optimisation of Niobium Thin Film Deposition Parameters for SRF Cavities J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - In order to accelerate the progression of thin film (TF) development for future SRF cavities, it is desirable to optimise material properties on small flat samples. Most importantly, this requires the ability to measure their superconducting properties. At Daresbury Laboratory, it has been possible for many years to characterise these films under DC conditions; however, it is not yet fully understood whether this correlates with RF measurements. Recently, a high-throughput RF facility was commissioned that uses a novel 7.8 GHz choke cavity. The facility is able to evaluate the RF performance of planar-coated TF samples at low peak magnetic fields with a high throughput rate of 2-3 samples per week. Using this facility, an optimisation study of the deposition parameters of TF Nb samples deposited by HiPIMS has begun. The ultimate aim is to optimise TF Nb as a base layer for multilayer studies and replicate planar magnetron depositions on split 6 GHz cavities. The initial focus of this study was to investigate the effect of substrate temperature during deposition. A review of the RF facility used and results of this study will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 253 EP - 258 KW - cavity KW - SRF KW - site KW - target KW - niobium DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-MOPMB062 UR - https://jacow.org/srf2023/papers/mopmb062.pdf ER - TY - CONF AU - Pira, C. AU - Antoine, C.Z. AU - Azzolini, O. AU - Benjamin, C. AU - Berry, S. AU - Berton, R. AU - Bertucci, M. AU - Bonesso, M. AU - Bradley, J.W. AU - Burt, G. AU - Caforio, R. AU - Candela, S. AU - Candela, V. AU - Chyhyrynets, E. AU - Dima, R. AU - Favero, G. AU - Fonnesu, D. AU - Ford, D. AU - Garcia, V.A. AU - Hryhorenko, O. AU - Jiang, X. AU - Kalboussi, Y. AU - Keckert, S. AU - Keppel, G. AU - Knobloch, J. AU - Kugeler, O. AU - Leicester, N.L. AU - Longuevergne, D. AU - Malyshev, O.B. AU - Marconato, G. AU - Marks, N. AU - Medvids, A. AU - Mychko, A. AU - Onufrijevs, P. AU - Paparella, R. AU - Pepato, A. AU - Piccoli, D. AU - Piccoli, F. AU - Proslier, Th. AU - Prucnal, S. AU - Rebesan, P. AU - Ries, R. AU - Romanato, M. AU - Salmaso, A. AU - Seal, D.J. AU - Seiler, E. AU - Sian, B.S. AU - Simon, S. AU - Smith, L.G.P. AU - Squizzato, G. AU - Staedler, T. AU - Stivanello, F. AU - Telatin, F. AU - Turner, D.A. AU - Valente-Feliciano, A-M. AU - Valizadeh, R. AU - Zhou, S. AU - Zubtsovskii, A.O. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Progress in European Thin Film Activities J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - Thin-film cavities with higher Tc superconductors (SC) than Nb promise to move the operating temperature from 2 to 4.5 K with savings 3 orders of magnitude in cryogenic power consumption. Several European labs are coordinating their efforts to obtain a first 1.3 GHz cavity prototype through the I.FAST collaboration and other informal collaborations with CERN and DESY. R&D covers the entire production chain. In particular, new production techniques of seamless Copper and Niobium elliptical cavities via additive manufacturing are studied and evaluated. New acid-free polishing techniques to reduce surface roughness in a more sustainable way such as plasma electropolishing and metallographic polishing have been tested. Optimization of coating parameters of higher Tc SC than Nb (Nb₃Sn, V₃Si, NbTiN) via PVD and multilayer via ALD are on the way. Finally, rapid heat treatments such as Flash Lamp Annealing and Laser Annealing are used to avoid or reduce Cu diffusion in the SC film. The development and characterization of SC coatings is done on planar samples, 6 GHz cavities, choke cavities, QPR and 1.3 GHz cavities. This work presents the progress status of these coordinated efforts. PB - JACoW Publishing CP - Geneva, Switzerland SP - 607 EP - 614 KW - cavity KW - SRF KW - target KW - niobium KW - laser DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-WECAA01 UR - https://jacow.org/srf2023/papers/wecaa01.pdf ER -