Modernization of the RF-field stabilization system in the main part of the in-booster injector-accelerator

To provide for high-intense pulsed proton beam acceleration in the main part of the in-booster injector-accelerator a system of auto-compensation (AC) is used which appears to be a fast-operating stabilization system with parametric feedback by a voltage wave reflected from a resonator. Currently the AC system provides for acceleration of beams with the currents of up to 100 mA with the accelerating HF-field stabilization accuracy being insufficient however. Reasons for AC system atsbilization accuracy limitation are considered and ways of the system modernization connected with the increase of quality of branching the waves reflected from the resonator using a powerful ferrite Y-circulator are considered. Results of testing Y-circulator in HF-power range from 0.6 to 3.8 MW are presented. 4 refs.; 3 figs