Development of a Radioactive Beams (RB) Accelerator Using an ISOL as a Source

High yields of separated, radioactive isotopic ions (up to 1011 atoms/sec per ¿A of incident protons) at on-line mass separators, e.g. ISOLDE at CERN (SC), make it feasible to consider using such secondary ions as projectiles for nuclear reactions. A pressing need for reaction data involving radioactive species exists in nuclear astrophysics. This requires having available projectiles (A ¿ 60) in the energy range from about 200 keV/amu to 1.5 MeV/amu. At TRIUMF, an ISOL device is proposed using the available high proton current (¿100 , ¿A). A beam of radioactive species, extracted with about E = 60 keV from the target/ion source, would be mass analyzed and transported vertically to experimental areas for use there or to be injected into a post-accelerator. Although other possibilities are being considered, most attention so far has been devoted to a RFQ/drift tube linac combination. Parameters for one possible system are presented.