• S. Canella, A. Beltramin, A. Calore, T. Contran, P. Modanese, F. Poletto
  INFN/LNL, Legnaro

In the LNL Heavy Ion Accelerator Complex, ALPI is a superconducting linear accelerator (Linac) whose first runs date back to 1993. In more than 15 years the LNL ALPI Linac evolved from an initial small configuration of 5 cryostats and 16 resonators to the actual size of 20 cryostats and 74 resonators. The superconducting character of ALPI implies the availability of a large cryogenic plant and distribution system to supply the liquid helium necessary to keep the resonators at 4.2 K. While the Linac structure has grown in the years and, in the mean time, the related cryogenic plant and distribution systems were enlarged and upgraded twice, the related control system remained largely unchanged in its main parts and it is now the first sub-system that urgently needs a deep renewing. The challenge to renovate a working control system with limited shut-downs is the subject of this presentation.