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TY - UNPB AU - Bystrov, P.A. AU - Pavlov, Y.S. AU - Rozanov, N.E. ED - Kuzin, Maksim V. ED - Schaa, Volker RW TI - Correction of Scanning System Deflecting Magnet Steel Core Hysteresys on UELV-10-10-S-70 Accelerator J2 - Proc. of RUPAC2018, Protvino, Russia, 01-05 October 2018 C1 - Protvino, Russia T2 - Russian Particle Accelerator Conference T3 - 26 LA - english AB - In radiation technologies, an electron beam is distributed in space by the deflecting magnets of the beam scanning system. The deflecting magnets always contain a ferromagnetic yoke, which is under the influence of alternating magnetic fields. A characteristic feature of ferromagnets in alternating fields is the existence of a hysteresis loop that affects the dependence of the effective magnetic field on time, and accordingly on the beam distribution in space and on the uniformity of irradiation dose. Depending on the process conditions, the hysteresis can have both a useful effect, which increases the uniformity of the distribution of dose fields and detrimental, which decreases the dose uniformity and erodes the units of the installation. The effect of the influence of hysteresis in the yoke of the scanning system deflecting magnet of the accelerator UELV-10-10-S-70 at IPCE RAS was studied. The negative influence of hysteresis was manifested in local overheating of the output foil and a decrease of beam utilization efficiency. Computer simulation of the scanning process with hysteresis was carried out using the computer code "Beam Scanning". Methods for eliminating the negative influence of hysteresis and optimizing the scanning system by selecting the steel grade of the magnetic yoke and changing the shape of the magnet current curve are proposed. These methods are implemented on an accelerator at IPCE RAS. PB - JACoW Publishing CP - Geneva, Switzerland ER -