Computation of Cyclotron Electromagnetic Fields

A highly advanced upgrade plan of the RIKEN AVF cyclotron is under way. The computation of the AVF electromagnetic fields was performed and successfully checked against the measurements. The following structural elements comprise the computer model of the machine: a beam buncher and two glazer lenses in the injection line, a magnet yoke, spiral sectors, central plugs, trim and harmonic coils, an inflector, an RF shield, RF dee electrodes, an electrostatic deflector, a magnetic channel, and a gradient corrector. Electric and magnetic field distributions and mechanical structures were transmitted to a beam dynamics code for simulations, in which particle losses on the surfaces of the system elements were estimated. The present study is focused on the AVF cyclotron electromagnetic fields that were used for the simulations of the AVF performance. New acceleration regimes were formulated with the help of the constructed computer model of the machine.