Author: Senatore, C.
Paper Title Page
RF Performances of Nb3Sn Coatings on a Copper Substrate for Accelerating Cavities Applications  
  • M. Arzeo, S. Fernandez, E.A. Ilyina, G.J. Rosaz, W. Venturini Delsolaro
    CERN, Geneva, Switzerland
  • M. Bonura, C. Senatore
    UNIGE, Geneva, Switzerland
  In the last decades, with the advancement of the bulk niobium technology for making superconducting RF (SRF) accelerating cavities, the expected theoretical limitations are being reached. For this reason superconducting materials alternative to niobium are being considered. One of the most promising among them is the Nb3Sn alloy. The higher critical temperature and field makes it very attractive for SRF applications. The coating of superconducting Nb3Sn films on a copper substrate has been optimized at CERN. Few micron thick films with excellent structural and morphological properties are prepared via DC magnetron sputtering of stoichiometric targets. While DC superconducting properties were measured along with the optimization of the coating methods, the RF performances were still unknown. In this talk we shall report on the results from the first complete RF characterization of such films. The surface resistance Rs is estimated as a function of both temperature and RF peak magnetic field at three different frequencies by means of the quadrupole resonator at CERN. The sensitivity of Rs to thermal cycling around Tc, and to trapped magnetic field, is also studied and presented.  
slides icon Slides THFUA7 [13.144 MB]  
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