Klystron Arc Protection. The modulator needs a crowbar or other equivalent protective network in case of a klystron fault (electrical arc). When a discharge occurs, the energy dissipation in the klystron must be limited. In case of a klystron fault, a recovery period must be respected before pulsing again. The control system to be provided shall be based on a Programmable Logic Controller (PLC) whose characteristics and model have to be communicated to INFN for approval. The slow changing signals are directly managed by the PLC. Faster signals are treated by “pulse surveyor” cards and the information will be sent to the PLC. Local supervision and control commands shall be made by a local Touch Panel. Personal security interlocks shall be treated by hard-wired interlocks.
