Investigations of surface quality and SRF cavity performance
  Magnetic field enhancement has been studied in the past through replica and cavity cutting. Considerable progress of niobium cavity manufacturing and processing has been made since then. Wide variety of single cell cavities has been analyzed through replica technique. Their RF performances were compared in corresponding to geometric RF surface quality. It is concluded that the surface roughness affects cavity performance mostly in secondary role. The other factors must have played primary role in cavity performance limitations. 
G. Wu, M. Ge (Fermilab), P. Kneisel (Jefferson Lab), K. Zhao (Peking   U.), J. Ozelis, D. Sergatskov, C. Cooper (Fermilab)
physics.acc-ph