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Kim, K.

Paper Title Page
MOPLS087 Series Test of High-gradient Single-cell Superconducting Cavity for the Establishment of KEK Recipe 756
 
  • T. Saeki, F. Furuta, Y. Higashi, T. Higo, S. Kazakov, H. Matsumoto, Y. Morozumi, K. Saito, N. Toge, K. Ueno, H. Yamaoka
    KEK, Ibaraki
  • M.Q. Ge
    IHEP Beijing, Beijing
  • K. Kim
    Kyungpook National University, Daegu
  • R.S. Orr
    University of Toronto, Toronto, Ontario
 
  We have performed a series of vertical tests of single cell Niobium superconducting cavities at 2 degrees Kelvin. These tests aimed at establishing the feasibility of reaching an accelerating gradient of 45 MV/m on a routine basis. The cavity profiles were all of the KEK low loss design and were fabricated from deep drawn Niobium half shells using electron beam welding. The cavity surface preparation followed an established KEK procedure of centrifugal barrel polishing, light chemical polishing, high temperature annealing, electropolishing, and finally a high pressure water rinse. Of the six cavities tested, three exceeded 45 MV/m on the first test. This clearly establishes the feasibility of this gradient. In this paper we describe these tests and our future program for optimising the surface preparation.