Devices to improve beam structure in slow extraction from the IHEP 70 GeV accelerator

To obtain uniform extraction of protons with a pulse duration up to 2s, devices of automation adjustment of a timing structure of the beam in the frequencies of 50-150 Hz are developed and experimentally studied. Improvements of an active filter of the accelerator magnetic field and devices for reduction of beam modulations are described. The increase of the coefficients of pulsation suppression over several times in the frequences of 50 and 100 Hz is achieved by means of active resonance RC filters included in the frequency correction circuits. Described is the technique of parametric compensation of beam modulations presented in the emission of the field pulsation signal in the frequency of 150 Hz by a band filter. The description of the guidance system with resoect to the resonance of betatron oscillations and the adjustment of beam modulations is given. Beam intensity feedback is used in the system. Improvement of rectangular form of the pulse was achieved by the use of amplifier with variable amplification factor, depending on the beam transmission coefficient