Acceleration of ions in a cyclotron with azimuthal variation of the magnetic field

Abstract

Experiments are reported on the acceleration of charged particles in the azimuthally varying magnetic field of the 1.5 metre cyclotron at the Institute of Atomic Energy, Academy of Sciences, USSR.(1) The creation of a magnetic field of the sector type with about 15 per cent flutter, for a potential between the dees of about 15 kV, permitted the acceleration of deuterons up to energies of 19 MeV. A study of the motion of the ions in the terminal orbits indicates the possibility of extracting the greater portion of a beam of ions with an energy considerably in excess of 20-22 MeV, by means of an electrostatic deflexion system. Relationships are obtained characterizing the process of acceleration in conditions of an azimuthally varying magnetic field. Experiments are described concerning adjustment of the magnetic field shape by current windings installed inside the accelerator chamber.