CERN Accelerating science

Article
Title	Results of the R&D; RF Testing Campaign of 1.3 GHz Nb/Cu Cavities
Author(s)	Vega Cid, Lorena (CERN) ; Bellini, Gloria (CERN) ; Bianchi, Antonio (CERN) ; Ferreira, Leonel (CERN) ; Leith, Stewart (CERN) ; Pereira Carlos, Carlota (CERN) ; Rosaz, Guillaume (CERN) ; Venturini Delsolaro, Walter (CERN)
Publication	2023
Number of pages	6
In:	JACoW SRF 2023 (2023) 621-626
In:	21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.621-626
DOI	10.18429/JACoW-SRF2023-WEIXA02
Subject category	Accelerators and Storage Rings
Abstract	In the context of the R&D; program on Nb/Cu carried out at CERN, a total of 25 tests have been performed since 2021. This talk will present these results. Three different manufacturing techniques have been used to produce the copper substrates, in order to investigate which is the most suitable in terms of quality and economy of scale. On one hand, the focus has been on optimizing the surface resistance at 4.2K, as this will be the operating temperature of FCC. The results at this temperature are encouraging, showing repeatable and optimized RF performance. On the other hand, RF tests have been done at 1.85 K too aiming at deepening the knowledge of the mechanisms behind the Q slope. This is key to work on the mitigation of this phenomenon and ultimately to extend the application of this technology to high energy, high gradient accelerators. The influence of the thermal cycles has been thoroughly investigated. A systematic improvement has been observed of both the Q slope and the residual resistance with slow thermal cycles.
Copyright/License	© 2024 the author(s) (License: CC-BY-4.0)

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