The Chalk River Heavy ion Superconducting Cyclotron

A detailed study of an isochronous cyclotron as an energy booster accelerator for the Chalk River 13 MV MP Tandem Van de Graaff has been undertaken. The cyclotron is intended primarily for heavy ions but would accelerate all ions from Li+3 to U+33 to at least 10 MeV/u. NbTi superconducting coils supplemented with cylindrical iron poles provide an average magnetic field of ~ 5T out to the extraction radius (0.65 m). Four saturated iron sectors with spiral edges provide focussing. Bunched ions are injected from the Tandem into the cyclotron midplane and stripped at the innermost orbit. An eight gap spiral edged rf structure provides 0.6 - 0.8 MV of accelerating voltage per turn. Electrostatic deflection initiates single turn extraction of the beam.