Abstract
A technique for forming square-wave (flat-topped, low-ripple) extraction spills under noise (stochastic) slow extraction of intermediate-energy beam at the magnetic-field flat bottom in the Institute for High Energy Physics (IHEP) U-70 synchrotron is described. For this method to be implemented, an extracted beam current feedback circuit has been developed. The specific feature of the circuit is control of the circulating beam, which diffuses in the transverse (horizontal) direction and does not constitute a linear time-invariant system. The functional block diagram and the feedback tuning procedure are substantiated. The technical characteristics of the feedback system and a brief description of its engineering implementation are presented. Results of the successful system testing with a carbon-nuclei beam in the U-70 machine are reported.
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