The role of cyclotrons as primary and secondary beam accelerators

Different kinds of accelerators can meet the specifications of the primary accelerator of the ISL. Among those, positive and negative ion isochronous cyclotrons are more specifically discussed. A fixed field, alternating gradient ring accelerator could represent a new, but still unproven, alternative. For the secondary accelerator, a high field, superconducting cyclotron could cover the required energy range, provided that a charge to mass ratio of 1/10 is available for the highest energies. The main quality of such a cyclotron would be its flexibility, and the main disadvantage would be a transmission probably smaller than required