Speaker
Yoshitaka YAMAGUCHI
(RIKEN Nishina Center)
Description
We would like to present current status of Rare-RI Ring Project in RIKEN RI Beam Factory (RIBF). Rare-RI Ring consists of long injection line, septum magnets, fast-response kicker magnet and cyclotron-like storage ring. Main purpose of the Rare-RI Ring is to measure mass of unstable nuclei related to R-process, which are located very neutron rich side. Basic idea of the Rare-RI Ring and principle of mass measurements have been already described in Ref.[1]. SHARAQ spectrometer [2] will be used as a part of the injection line. The cyclotron-like storage ring will consist of recycling 24 sector magnets used in heavy-ion synchrotron TARNII. In the half of the sector magnets, we will put n-value and trim-coils to adjust isochronous field. According to our simulation, expected isochronicity is less than 10-6 with large emittance of the beam (~50 π-mm-mrad). Individual injection [3] is another important issue for the Rare-RI Ring. To perform the individual injection, fast response in kicker magnet is necessary. Very recently, we succeeded to excite the kicker magnet in ~400 ns after we improved response of cylatron trigger. This fast response allows us to inject RI beams with 200 A MeV, that is almost yield optimum energy for RI beams in RIBF.
[1] Y. Yamaguchi et al., NIMB 266 (2008) 4575.
[2] S. Shimoura, NIMB 266 (2008) 4131.
[3] I. Meshkov et al., NIMA 523 (2004) 262.
Primary author
Prof.
Akira Ozawa
(Institute of Physics, University of Tsukuba)
