N. N. Agapov¹, A. V. Butenko¹, H. G. Khodzhibagiyan¹, A. D. Kovalenko¹, O. S. Kozlov¹, V. A. Mikhailov¹, V. A. Monchinsky¹, A. A. Smirnov¹, V. I. Volkov¹, D. Dinev^2
1Joint Institute for Nuclear Research, Dubna, 141980 Dubna, Moscow Region, Russia
²Institute for Nuclear Research and Nuclear Energy, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria

Abstract. The existing set of Nuclotron heavy ion sources, such as duoplazmatron, polarized deuteron, laser and electron beam ion sources permits to have ion beams over a wide range of masses. The main problem for us now is to gain high intensity of accelerator particles. It can be solved by means of multiturn injection of the low current beams into the booster, acceleration up to the intermediate energies, stripping and transfering into the main ring. A design study of this accelerator - the 250 MeV/Amu Nuclotron booster synchrotron at 1 Hz repetition rate and circumference of 84 m, has been completed. The lattice dipole and quadrupole magnets have an iron yoke coils, made of hollow superconductor, are cooled by two-phase helium flow, as well as the Nuclotron magnets.

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