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A C-shaped electromagnet with superconducting coils for the four-sector deuteron cyclotron of energy about 100 MeV is being developed at the JINR LNP. This cyclotron is the second stage of an accelerating complex for the neutron generator for the electronuclear method of energy generation. The maximum induction in the magnet is 4.5 T, stored energy is 5 MJ, mean current density in a coil is 9· 10 7 A/m 2 . The heat impulse which shifts the coil to a normal condition is estimated. The status of the manufacturing of the magnetic system elements is considered.

The results of calculations of a superconducting magnet with a 'cold' pole for a cyclotron to deuteron energy of 100 MeV are presented. The maximum induction in the magnet is 4.5 T; the stored energy is 5 MJ; and the mean current density in the coil is 9*10/sup 7/ A/m/sup 2/. The scheme and main parameters of the magnet protection system and cryogenic provision system are described. The results of calculation of magnetic and thermal forces acting on the coil and its case are presented. The status of the manufacture of the magnetic system elements is considered. >