Upgrading project of RIKEN
Accelerator Research Facility (RARF)
The RIBF accelerators will allow us to provide a lot of users with the world's most intense RI beams at energies of several hundreds MeV/nucleon over the whole range of atomic masses.
At present, the existing facility has the world-class heavy-ion accelerator complex
consisting of a K540-MeV ring cyclotron (RRC) and a couple of different types
of the injectors: a variable-frequency heavy-ion linac (RILAC) and a K70-MeV
AVF cyclotron (AVF). Moreover, its projectile-fragment separator (RIPS) provides
the world's most intense light-atomic-mass (less than nearly 60) RI beams.
The RIBF will add new dimensions to the existing facility's present capabilities: a new high-power heavy-ion booster system consisting of three ring cyclotrons with K=570 MeV (fixed frequency, fRC), 980 MeV (intermediate stage, IRC) and 2500 MeV (superconducting, SRC), respectively, will boost energies of the output beams from the RRC up to 440 MeV/nucleon for light ions and 350 MeV/nucleon for very heavy ions. An 880 MeV polarized deuteron beam will also be available. The goal of the available intensity is set to be 1 pμA, which is limited due to presently planned radiation shielding power around a primary-beam dump. These energetic heavy-ion beams will be converted into intense RI beams via the projectile fragmentation of stable ions or the in-flight fission of uranium ions by the superconducting isotope separator, BigRIPS. The combination of the SRC and the BigRIPS will expand our nuclear world on the nuclear chart into presently unreachable region.