Recent studies of linac for production of radioactive beams in the INR

Accelerators for the production of radioactive ion beams have been proposed by many laboratories. A wide range of research in nuclear physics can be carried out with a 6-10 MeV/n radioactive beam. For the ion source to produce high intensity beams, the initial charge-to-mass ratio must be as low as possible, 1/60, for instance; but the cost of a linac for these beams becomes high. Recently at TRIUMF a 1.5 MeV/n linear accelerator accepting ions with q/A=1/30 has been proposed. Possessing the feature of variable energy, this linac can provide for various experiments in astrophysics. A similar project is under consideration at INR. Below we describe the optimized design of the linac for the energy range 2 keV/n to 1.76 MeV/n, calculation of the RF power consumption in the accelerating structures by the MAFIA code and end-to-end beam dynamics simulation in the realistic RF field distribution