• L. Ristori, G. Apollinari, E. Borissov, I.G. Gonin, T.N. Khabiboulline, A. Mukherjee, T.H. Nicol, J.P. Ozelis, Y.M. Pischalnikov, D.A. Sergatskov, R.L. Wagner, R.C. Webber
  Fermilab, Batavia

The Fermilab High Intensity Neutrino Source (HINS) linac R&D program is building a pulsed 30 MeV superconducting H^- linac. The linac incorporates superconducting solenoids, high power RF vector modulators and superconducting spoke-type accelerating cavities starting at 10 MeV. This will be the first application and demonstration of any of these technologies in a low-energy, high-intensity proton/H^- linac. The HINS effort is relevant to a high intensity, superconducting H^- linac that might serve the next generation of neutrino physics and muon storage ring/collider experiments. In this paper we present the RF design, the mechanical design, the fabrication, the chemistry and testing of the first two SSR1 (Single Spoke Resonator type 1) prototype cavities. These cavities operate at 325 MHz with β=0.21. The design and testing of the input coupler and the tuning mechanism are also discussed.

• 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.