Modeling of the magnetic system and beam dynamics in the CC-18 cyclotron

The СС-18 cyclotron is designed to accelerate negative hydrogen ions and is intended to generate a wide range of radionuclides. In order to simplify its design, a unified configuration of the resonant system was chosen. In this work, a model of the main electromagnet of the cyclotron was constructed and the distribution of the magnetic field induction in the median plane was obtained. Based on the analysis of static equilibrium orbits, an isochronous curve corresponding to the operating frequency of the resonant system and the acceleration of the ion beam at the second harmonic was determined. During a series of calculations of the three-dimensional distribution of the electric field and particle dynamics in the center of the cyclotron, the optimal configuration of the elements of the central region was determined. As a result of optimizing the configuration of the central region, the ion capture coefficient in the acceleration was increased while maintaining an acceptable radius of the center zone. At the stage of modeling the dynamics of particles in the zone of the main acceleration, the isochroneity of acceleration was checked and the beam envelope in the axial plane was estimated. To determine the angular position of the stripping devices, a simulation of the release of particles from static equilibrium orbits was carried out. Optimal radial and azimuthal coordinates of the graphite stripper foils are obtained.

Authors: K. S. Vorobev, Yu. K. Osina, D. K. Kostrin

Direction: Physics

Keywords: isochronous cyclotron, resonant system, three-dimensional modeling, main electromagnet, particle dynamics, capture coefficient, stripping device, stripper foil

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