Ion source development for isotope separator on-line based radioactive nuclear beam facility at KEK-Tanashi

For an isotope separator on-line based radioactive nuclear beam facility at KEK-Tanashi, two different types of ion sources are currently employed: a single stage 6.4 GHz electron cyclotron resonance ion source for Ne-18(2+) and Ne-19(2+) ions and a surface ionization-type ion source for Li-8(1+) io ns. The production target for Ne radioisotopes is LiF powder. Enclosed in a water-cooled Cu target cell, the target can sustain proton beam power of 1 20 W for a long term. The methods to suppress unwanted isotopes, like F-19 in Ne-19 and O-18 in Ne-18, are discussed. For the production of Li-8(1+) w ith the surface ionization-type ion source, a recoil-catcher method is adop ted. The feasibility is discussed, comparing to a thick target method. (C) 2000 American Institute of Physics. [S0034-6748(00)57602-3].