Modeling of magnetic system of isochronous cyclotron CYTREC

The basic results on modeling the magnetic system of the cyclotron CYTREC in the scale 1:2.5 are presented. The model of the magnetic system of the cyclotron CYTREC is designed and produced for a choice of the form of sector shims, which form a required average magnetic field. The cyclotron is made for acceleration of heavy mass ions with the relation of weight to the charge A/Z approx =5 up to the energy W=2.4 MeV/nucleon. The extracted beam (approx 10 sup 1 sup 1 sec sup - sup 1) is intended for manufacture of track membranes. For the cyclotron a sh-shape electromagnet with the diameter of poles 1600 mm and gap between them delta=100 mm is used. The variation of the magnetic field is created by a system of 4 pairs of sector shims fixed on poles in axial symmetry, forming the radial-sector structure of a field such as Thomas shape with the periodicity N=4. The minimal gap between the shims is accepted equal to h sub 1 =40 mm, and their height makes b=30 mm. The chosen parameters of the sector shims provide axial stability of the accelerated particles 0<Q sub z <0.5.