• C.A. Cooper, J.S. Brandt, L. Cooley, M. Ge, E.R. Harms, T.N. Khabiboulline, J.P. Ozelis
  Fermilab, Batavia
• C. Boffo
  BNG, Würzburg

Fermi National Accelerator Lab is continuing to improve its infrastructure for research and development on the processing of superconducting radio frequency cavities. A single cell 3.9 GHz electropolishing tool built at Fermilab and operated at an industrial partner was recently commissioned. The EP tool was used to produce a single cell 3.9 GHz cavity that reached an accelerating gradient of 30 MV/m with a quality factor of 5 10⁹. A single cell 1.3 GHz cavity was also electropolished at the same industrial vendor using the vendor’s vertical full-immersion technique. On their first and only attempt the vendor produced a single cell 1.3 GHz cavity that reached 30 MV/m with a quality factor of 1 10¹⁰. These results will be detailed along with preliminary tumbling results.