RESULTS OF 3D BEAM DYNAMIC STUDIES IN DISTORTED FIELDS OF A 250 MeV SUPERCONDUCTING CYCLOTRON

For PSI’s new medical cyclotron COMET, three dimensional particle tracking calculations are performed with the code TRACK. We discuss some examples, such as the effects of coil misalignment and of crossing betatron resonances. Also the effect of the magnetic field from the Dee-currents is described.