Development of superconducting dipole design for creation of fast-cycling magnetic fields

Short models of the UNK superconducting dipole reached a maximum central field of 6.5 T with 0.8 T/s ramp rate. It allows one to consider this magnet design as a basis for development of a superconducting dipole, which will have low heat loss and could be used for the production of fast-cycling magnetic fields, with 6T amplitude and 1 T/s ramp rate, for the new GSI synchrotron SIS-300. The dipole geometry makes it possible to independently suppress both central field and integral field low-order harmonics. The specific shape of the coil end parts enables a decrease of the maximum field in the end parts to the level in the straight part of the coil. Analyzes of magnet AC heating during the SIS-300 cycle, as well as heat transfer to the helium coolant, are presented. The magnet temperature margin and methods to increase it are discussed.