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

In 2008, the RIKEN RI-Beam Fac­to­ry (RIBF) suc­ceed­ed in pro­vid­ing heavy ion beams of ⁴⁸Ca and ²³⁸U with 170 par­ti­cle-nano-am­pere and 0.4 par­ti­cle-nano-am­pere, re­spec­tive­ly, at an en­er­gy of 345 MeV/u. The trans­mis­sion ef­fi­cien­cy through the ac­cel­er­a­tor chain has been sig­nif­cant­ly im­proved owing to the con­tin­u­ous ef­forts paid since the first beam in 2006. From the op­er­a­tional point of view, how­ev­er, the in­ten­si­ty of the ura­ni­um beam should be much in­creased. We have, there­fore, con­struct­ed a su­per­con­duct­ing ECR ion source which is ca­pa­ble of the mi­crowave power of 28 GHz. In order to re­duce the space-charge ef­fects, the ion source was in­stalled on the high-volt­age ter­mi­nal of the Cock­croft-Wal­ton pre-in­jec­tor, where the beam from the source will be di­rect­ly in­ject­ed into the heavy-ion linac by skip­ping the RFQ pre-in­jec­tor. The test of the ion source on the plat­form has start­ed re­cent­ly with an ex­ist­ing mi­crowave source of 18 GHz. This pre-in­jec­tor will be avail­able in Oc­to­ber 2009. We will show fur­ther up­grade plan of con­struct­ing an al­ter­na­tive in­jec­tor for the RIBF, con­sist­ing of the su­per­con­duct­ing ECR ion source, an RFQ, and three DTL tanks. An RFQ linac, which has been orig­i­nal­ly de­vel­oped for the ion-im­plan­ta­tion ap­pli­ca­tion will be reused for the new in­jec­tor. Mod­i­fi­ca­tion of the RFQ as well as the de­sign study of the DTL are under progress. The new in­jec­tor, which will be ready in FY2010, aims at in­de­pen­dent op­er­a­tion of the RIBF ex­per­i­ments and su­per-heavy el­e­ment syn­the­sis.

Slides