Central Region of 240 Cm Variable Energy Cyclotron

The description of the central optics for 2.4 m isochronous cyclotron is given in this report. The main parameters of the cyclotron are reported in an other paper contributed to the conference [1]. This cyclotron will accelerate protons up to the maximum energy 100 MeV and other particles. The aim of original orbits property studies is to obtain compact ion beam at possibly high time duration of current pulse. In addition to, the control flexibility requirement for the position of all central optics elements is taken into account, which is important for cyclotron with variable energy of particles. A number of experiments were carried out on 685 mm sector cyclotron [1], which investigated the ion motion near the center.