Acceleration of Multicharged Heavy Ions in IPCR (Riken) Ordinary 160 cm Cyclotron

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Abstract
In the IPCR (Riken) 160 cm ordinary cyclotron the operation ranges of electromagnet and radio frequency system are 0.5 to 2.0 wb/m2 and 5.0 to 12.0 MH Z respectively, and various particles of different mass to charge ratios from proton to Ne5+ ion can be accelerated with variable energy. Multicharged heavy ion sources of electron bombarded hot cathode type for this cyclotron have been developed to produce C4+, N4+, O4+, N5+ and O5+ ions. At present these ions are produced in sufficient quantities under arc power of 2.0 to 2.5 kW. The source life is mainly limited by the erosion of tungsten cathode at about 20 hours. The attenuation of beam current by charge exchange collision with residual molecules and the spectra of various ions accelerated in the cyclotron are discussed. C4+, N4+ and O4+ ions are accelerated up to 39 to 120 MeV, 45 to 100 MeV and 52 to 100 MeV respectively and used for several experiments.

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