• 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.