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WET2H8 |
SRF Material R&D for FCC | |
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| In the context of the FCC study, CERN is re-launching R/D efforts on SRF materials to meet the challenges of a large machine: energy efficiency and investment costs. The focus is put on the development of thin superconducting films on copper substrates. Thin films have been used at CERN for large SRF systems since the LEP time, on to the LHC and now recently in the HIE-ISOLDE linac. In all these applications niobium was the superconductor of choice. Nb/Cu cavities have achieved low surface resistances at the fields of interest, and their potential is not exhausted. Q slope mechanisms are being investigated, with the aim of bringing the high field performance of coated cavities closer to the the level of bulk Nb. In parallel, other superconducting materials, like Nb3Sn and V3Si are studied as a promising alternative to Nb/Cu in the timeline of the study. In this contribution, an overview will be given of the R/D program ongoing at CERN on SRF materials for FCC, and some first results will be presented. | ||
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WET2H9 |
Superconducting Radio Frequency Cavities Coating Techniques | |
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| Thin film superconducting coatings offer a valuable alternative to conventional bulk niobium cavities mainly by reducing the cost of raw material and enhancing the heat exchange efficiency thanks to the copper substrate. The current and future superconducting radiofrequency (SRF) cavities designs and working frequencies lead to a variety of shapes and sizes to be coated. In this work we present the constraints to coat complex 3D geometries and the challenges of obtaining uniform SC layer properties with different coating techniques. It will be supported by concrete examples from ongoing cavities coating production and studies for future projects at CERN. Finally the R&D methodology, from plasma simulation to layer characterization, will be described. | ||
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