UPGRADE OF FEEDBACK LOOPS IN ACCELERATING CAVITIES OF U70

A. Markinª, V. Chubrik, S. Ivanov, O. Lebedev, I. Sulygin

Institute of High Energy Physics, Protvino, Russia

Abstract

The entire accelerating system of the U70 proton syn-chrotron of IHEP-Protvino comprises 40 identical ferrite-loaded cavities yielding 10 kV per gap max [1]. To ensure control over amplitude and phase of RF voltage across the each accelerating gap, two feedback loops per cavity are employed – for automatic voltage amplitude (shortly, AVC) and automatic resonant frequency (AFC) controls. Attaining higher intensity and better quality of beam in the U70 depends upon operational performance of the AVC and AFC circuits in question. To this end, these cru-cial sub-systems were recently renovated so as to imple-ment the up-to-date hardware and electrical-circuit solu-tions. The paper contains a brief technical specification of the thus updated feedbacks. Experience acquired during their turning on and beam-testing results are presented.

ª – corresponding author

Paper 

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