The Feature of Magnetic Field Formation of Multi-Purpose Isochronous Cyclotron DC280

At the present time the activities on creation of the new heavy-ion isochronous cyclotron DC280 are carried out at Joint Institute for Nuclear Research. The isochronous cyclotron DC-280 will produce accelerated beam of ions A/Z= 4 - 7 with a smooth variation of the beam energy W= 4 ' 8 MeV/n. The variation of energy is provided by the wide range of the magnetic field levels from 0.64T till 1.32T and usage of the 11 radial and 4 pairs of harmonic correcting coils. In the work the results of calculations and final measurements of the magnetic field are presented. The magnetic field of cyclotron DC-280 is formed in a good conformity with results of computer modeling.