ACCELERATING VOLTAGE AMPLITUDE AND PHASE STABILIZATION FOR THE MILAN SUPERCONDUCTING CYCLOTRON.

Two feedback loops are employed to control the phase and the amplitude stability of the Milan Superconducting Cyclotron accelerating voltage. In this paper we describe the main features of these sys terns together with the experimental results obtained during the full power tests of the first RF cavity. In particular we obtained, all over the frequency range, a phase stability better than f 0.2 ’ and an amplitude modulation noise below 5.10-5 at 100 kV peak dee voltage