Author: Ehiasarian, A.P.
Paper Title Page
WEPWO044 RF Characterization of Niobium Films for Superconducting Cavities 2399
  • S. Aull, S. Calatroni, S. Döbert, T. Junginger, G. Terenziani
    CERN, Geneva, Switzerland
  • S. Aull
    University of Siegen, Siegen, Germany
  • A.P. Ehiasarian, G. Terenziani
    Sheffield University, Sheffield, United Kingdom
  • J. Knobloch
    HZB, Berlin, Germany
  Funding: Work supported by the Wolfgang-Gentner-Programme of the Bundesministerium für Bildung und Forschung (BMBF)
The surface resistance RS of superconductors shows a complex dependence on the external parameters such as temperature, frequency or radio-frequency (RF) field. The excited modes of 400, 800 and 1200 MHz allow measurements at actual operating frequencies of superconducting cavities. Niobium films on copper substrates have several advantages over bulk niobium cavities. HiPIMS (High-power impulse magnetron sputtering) is a promising technique to increase the quality and therefore the performance of niobium films. This contribution will introduce CERNs recently developed HiPIMS coating apparatus. Moreover, first results of niobium coated copper samples will be presented, revealing the dominant loss mechanisms.