The Research Center for Nuclear Physics Ring Cyclotron

The main components of the new facility are a six sector variable energy ring cyclotron and a beam circulation ring linked to a high precision dual magnetic spectrograph system, a neutron TOF facility with a 100 m neutron flight tunnel and a heavy ion secondary-beam facility. The beams extracted from the RCNP AVF cyclotron are transported through one of the beam lines of the old facility and injected into the ring cyclotron. With this accelerator system, beams of p, d, ³He, alpha and light-heavy ions are available in the wide range of energies up to 400, 200, 510, 400 and 400 Q²/A MeV, respectively. An emphasis is placed on the production of high quality beams to enable precise experiments. These beams are extracted with single turn extraction mode with flat-topping. A beam energy width of 80 keV was achieved for 300 MeV protons. An energy resolution of 25 keV and 35 keV were obtained with the high resolution spectrograph Grand Raiden by using dispersion matching for 300 MeV and 400 MeV proton inelastic scattering spectra, respectively. A very short polarized proton beam pulse of 150 ps was achieved for a neutron TOF experiment