• R.L. Geng, S. Castagnola, A.C. Crawford, D. Forehand, B.A. Golden, C.E. Reece, S. Williams
  JLAB, Newport News, Virginia

We have EP processed several multi-cell cavities previously heavy BCP etched. With a surprisingly light EP removal of less than 50 micron, all cavities have shown significant gradient and Q improvement. So far three cavities including two fine-grain niobium 7-cell CEBAF upgrade prototype cavities and one large-grain niobium 9-cell ILC cavities have been treated and tested. Both 7-cell cavities reached a quench limit without field emission. Another 7-cell cavity has been treated and is under RF test. We give a summary of the test results.