Applied Physics A

, Volume 30, Issue 3, pp 185–187 | Cite as

Improvement of the polishing treatment for niobium surfaces of superconducting cavity resonators

  • Y. Uzel
  • K. Schnitzke
  • N. Krause
Contributed Papers


For superconducting cavities made from niobium sheet, which are interesting in the field of accelerator applications, smooth and defect free inner surfaces are needed to achieve a high unloadedQ along with high accelerating field strength. These can be obtained using chemical polishing procedures. Whereas normally a mixture of HF, HNO3, and H3PO4 is applied, we chose the known bath containing HF, HNO3, and H2SO4 and worked above 50 °C. The surface quality was judged by visual inspection using a light microscope as well as by microwave measurements of one spherical resonator. The new method gave less grain boundary etching and, with high field levels, an enlarged unloadedQ.


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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • Y. Uzel
    • 1
  • K. Schnitzke
    • 1
  • N. Krause
    • 1
  1. 1.Research LaboratoriesSiemens AGErlangenGermany

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