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Morgan, A. V.

Paper Title Page
WEPMS010 Surface Studies of Contaminants Generated During Electropolishing 2346
 
  • A. V. Morgan, H. Padamsee
    Cornell University, Ithaca, New York
  • A. Romanenko, A. J. Windsor
    CLASSE, Ithaca
 
  Funding: NSF

Electropolishing is now the preferred method for chemical treatment of niobium cavity surfaces. It provides a very smooth surface and after baking accelerating fields between 35 - 40 MV/m. However the reproducibility of performance needs to be improved substantially. Some of the leading causes are related to contaminant residues after electropolishing, these include sulphur particles, niobium pentoxide particles and traces of aluminum from reaction between the aluminum cathode and the acid electrolyte. We have carried out studies to enhance the deposition of such particles so that we can isolate and study the residues. We will present analysis of these studies using optical microscopy, SEM, and Auger. In at attempt to dissolve these contaminants, we have also conducted studies on the effectiveness of various rinsing agents, such as degreasing agents, dilute HF, hydrogen peroxide.