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Since 1997, RIKEN Nishina Center has been constructing the Radioactive Isotope Beam Factory (RIBF) and succeeded in beam commissioning of its accelerator complex at the end of 2006. The world's first superconducting ring cyclotron (SRC) is the final booster in the RIBF accelerator complex which is able to accelerate all-element heavy ions to a speed of about 70% of the velocity of light. Assembling of the superconducting sector magnets was completed in August 2005. The superconducting coils were successfully cooled down and excited for tests on many operational aspects: magnetic force, coil protection and quality of magnetic field, showing that they work as designed. After a series of tests the other components were installed and tested under stray fields from the sector magnets. Local magnetic shields were put to the components which could not work under the stray fields. After setups of beam vacuum and radio frequency, beam commissioning started. The first beam was extracted at the end of 2006 and the first uranium beam was extracted in March 2007. [ABSTRACT FROM AUTHOR]

RIKEN Nishina Center for Accelerator-Based Science in RIKEN is constructing the Radioactive Isotope Beam Factory (RIBF), which is capable of providing the world's most intense RI beams over the whole range of atomic masses. The world's first superconducting ring cyclotron (SRC) is the final booster in the RIBF accelerator complex which is able to accelerate all-element heavy ions to a speed of about 70% of the velocity of light. Assembling of six superconducting sector magnets in the SRC vault was completed in August 2005. This paper describes results of their cool-down and excitation tests, which were performed to check the magnet system from the various points of views: magnetic force, coil protection, magnetic field and operation of their cryogenic cooling system. [ABSTRACT FROM AUTHOR]

Abstract: Two types of rotating charge strippers were constructed for the acceleration of intense heavy-ion beams at the RIKEN RI-beam factory. One charge stripper rotates a carbon disk using a rotating shaft. The other rotates a carbon foil attached onto the end of a rotating cylinder that is connected to hollow-shaft rotary-motion feedthroughs. [Copyright &y& Elsevier]

Abstract: A charge-stripping foil changer that has an energy adjuster function was constructed. One of the 30 foils in the changer is placed at the beam position without opening the vacuum chamber. The energy of the beam behind the charge stripper is adjusted by changing the effective thickness of the foil, which is changed by tilting the foil at an angle from 0° to 60°. A uranium beam was accelerated to 345MeV/nucleon using two charge-stripping foil changers with an energy adjuster function. [Copyright &y& Elsevier]