A sharp increase in the efficiency of neutron generation is caused by cyclic deuteron accumulator with internal deuteron or beryllium target. In this accumulator, beam of deuterons of constant energy pass through the target many times with ionization energy loss compensated by high frequency electric field. Advantages of deuteron accelerator of 30-100 MeV is due to two factors: On the one hand, the desire to decrease the charged particle energy 10-30 times compared with a traditional electronuclear process plants and, on the other hand, the prospect of producing neutrons within a range of energies of greater interest for fusion studies and for efficiently burning high level nuclear wastes from nuclear power plants.