arXiv:acc-phys/9507001v2 9 Aug 1995 Preprint YRPHI-1995(6)-95 COAXIAL RING CYCLOTRON AS A PERSPECTIVE NUCLEAR POWER ENGINEERING MACHINE A.R.Tumanian, Kh.A.Simonian, R.L.Mkrtchian, A.Ts.Amatuni, R.O.Avakian Yerevan Physics Institute A.G.Khudaverdian Yerevan State University Abstract The circuit arrangement of the proposed coaxial ring cyclotron (CRC) is described, and its main advantages, such as simple injection technique, several injected beams summation option, high efficiency, are considered. The proposed proton accelerator is a perspective ma- chine for the solution of the main problems of the present day nuclear power engineering as well as for the next-generation nuclear power plants, representing a combination of subcritical reactors and particle accelerators. The possibility of installation of CRCs into ring acceler- ators with an average diameter from 60 to 100m, e.g., the Yerevan electron synchrotron, is considered. Introduction In recent years a complex of major applied problems has clearly crystallized, for successful solution of which are required powerful proton accelerators with proton beam intensity from 5 to 100mA, energy from 500 to 800 MeV, and high efficiency. To such problems relate, e.g., production of different radioactive isotopes, turning nuclear fuel out from U 238 and Th 232 , nuclear power plant radioactive waste treatment, designing of safe (subcritical) and next-generation waste-free nuclear power plants, which can utilize unenriched uranium or thorium. As well as in this connection, due to the successful conduction by C. Rubbia’s group, CERN [1] of the experiment approving in principle a new and perspective possibility 1