• G. Bisoffi, F. Chiurlotto, G. Maggioni, A. Palmieri, A.M. Porcellato, A.A. Rossi, S. Stark
  INFN/LNL, Legnaro, Padova

A novel superconducting (sc) structure, called Ladder resonator [1], was proposed, in order to accelerate a high intensity proton beam within the energy range of 5–20 MeV. The first Q-curves were affected by a serious electron-beam welding inconvenience, discovered at a later stage. After repairing the resonator, the Q-values at low field improved by around a factor 4. Present value of the achievable accelerating field is limited by the availability of liquid He, in relationship with the time needed to condition both RFE and FE at 4,2 K. The path to reach the design performance is also discussed in the paper. [1] URL: http://link.aps.org/doi/10.1103/PhysRevSTAB.6.040101