Abstract
The radioactive nuclear beam facility based on the ISOL-and-post-accelerator method is being proposed at INS as one of the experimental arenas in the Japanese Hadron Project. It is to accelerate exotic nuclei produced in 1 GeV proton-induced reactions with a series of heavy-ion linacs up to several MeV/nucleon. In the present plan, the acceleration is made in three stages using split-coaxial RFQ (SCRFQ), Interdigital-H and Alvarez linacs, the maximum energy in each stage being 0.17, 1.4 and 6.5 MeV/nucleon, respectively. The charge-to-mass ratio (q/m) that can be accelerated in this scheme is planned to be q/m≥1/60. As one of its R&D works we have already developed a special type SCRFQ linac, which is suited for efficient acceleration of low-speed ions with extremely small q/m values.A prototype of the above facility is now under construction at INS, in which unstable nuclei produced by beams from the existing INS K = 68 cyclotron can be accelerated up to around 1 MeV/nucleon. In this case the minimum q/m value of ions acceptable by the linacs is 130.
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