New form of exploitation of cyclotron U-120

Abstract

Experiments carried out on the Nuclear Research Institute cyclotron U-120 showed that the energy of the output beam can be changed in the region 6·2–7·2 MeV/nucl without additional correction of the radial slope of the magnetic field (e.g. with the use of ferromagnetic shims suitable for an energy of 6·7 MeV/nucl). Using a combination of ring and disc shims, ions of atomic hydrogen were accelerated in the energy region 8·5–10·7 MeV and ions of₃He²⁺ with energy 21 MeV. The intensities of these beams, except₃He²⁺ having been accelerated in the economical regime of the ion source, reached as much as 100 μA behind the deflector. The possibility of smooth regulation of the energy without changing the classical character of the accelerator is also discussed.