Abstract
A novel system for high-energy beam extraction from the U-70 proton synchrotron to the external beam transfer line (i.e., a multiturn fast extraction system) is described. The beam is forced into the first upstream ejection device—an electrostatic deflector—by means of fast dipole bump magnets with the field rise time of 50–100 μs (equivalent of 10–20 beam turns). The fast bump magnets and their power supplies are described. The first experimental results acquired during trial operation of the multiturn fast extraction system in 2014 are presented. From these results, it is apparent that the extracted beam parameters are close to those obtained with the available single-turn fast extraction system.
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