• K. Yamada, T. Dantsuka, M. Fujimaki, T. Fujinawa, N. Fukunishi, A. Goto, H. Hasebe, Y. Higurashi, E. Ikezawa, O. Kamigaito, M. Kase, M. Kobayashi Komiyama, H. Kuboki, K. Kumagai, T. Maie, M. Nagase, T. Nakagawa, J. Ohnishi, H. Okuno, N. Sakamoto, Y. Sato, K. Suda, M. Wakasugi, H. Watanabe, T. Watanabe, Y. Watanabe, Y. Yano, S. Yokouchi
  RIKEN, Wako, Saitama

The Radioactive Isotope Beam Factory at RIKEN Nishina Center is a next generation facility which is capable of providing the world’s most intense RI beams over the whole range of atomic masses. Three new ring cyclotrons have been constructed as post-accelerators for the existing facility in order to provide the intense heavy ion beam for the RI beam production by using a in-flight separation method. The beam commissioning of RIBF was started at July 2006 and we succeeded in the first beam extraction from the final booster cyclotron, SRC, by using 345 MeV/nucleon aluminum beam on December 28^th 2006. The first uranium beam with energy of 345 MeV/nucleon was extracted from the SRC on March 23^rd 2007. Various modifications for equipments and many beam studies were performed in order to improve the transmission efficiency and to gain up the beam intensity. Consequently, the world’s most intense 0.4 pnA ²³⁸U beam with energy of 345 MeV/nucleon and 170 pnA ⁴⁸Ca beam with energy of 345 MeV/nucleon have been provided for experiments.

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