ИСТИНА

A highly advanced upgrade plan of the RIKEN AVF cyclotron is under way. The present study is to expand the region of its available acceleration energies as well as to increase the beam intensity with the help of detailed orbit simulations. The computer model of the AVF electromagnetic field was prepared and successfully checked against the measurements. Electric and magnetic field distributions and mechanical structures were transmitted to the beam dynamics code for simulations, and particle losses during the injection, acceleration and extraction were estimated. Some experiments already conducted with the beams confirmed the selection of the machine parameters based on the beam dynamics simulations. The new inflector geometry and the optimized central electrode structure have been formulated for the upgrade.