A State Of The Riken Radioisotope Beam Factory

RIKEN Radioisotope Beam Factory (RIBF) consisted of a heavy ion linac (RILAC), a small cyclotron (AVF), four ring cyclotrons (RRC, fRC, IRC and SRC), and projectile-fragment separators (RIPS and BigRIPS) when its operation was started at the end of 2006. SRC is the final stage superconducting cyclotron and its maximum energy is 400 MeV/nucleon for lighter ions of hydrogen to Ar and 350 MeV/nucleon for heavier ions up to uranium. A new injector linac (RILAC-II) with a 28 GHz superconducting ECR ion source was completed in March, 2011 and beam intensities of 1 p mu A for He-4 and 3 pnA for U-238 were achieved. Polarized deuteron beam is also available. New developed electron-nucleus scattering equipment is under construction. It is called SCRIT (Self-Confining Radioisotope Ion Target) and consists of a 150-MeV microtron and a 700-MeV synchrotron storage-ring. It will realize the electron scattering experiment with unstable nuclides for the first time. In spite of the big earthquake on March 11, 2011, damages on the accelerators were quite small, that is, vacuum leaks were found at two points in the transport lines. They were repaired, and the experiment was started in June, 2011.