Author: Nakagawa, T.
Paper Title Page
MOPFI025 Progress Towards High-Intensity Heavy-Ion Beams at RIKEN RIBF 333
  • O. Kamigaito, T. Dantsuka, M. Fujimaki, T. Fujinawa, N. Fukunishi, H. Hasebe, Y. Higurashi, E. Ikezawa, H. Imao, T. Kageyama, M. Kase, M. Kidera, M. Komiyama, H. Kuboki, K. Kumagai, T. Maie, M. Nagase, T. Nakagawa, M. Nakamura, J. Ohnishi, H. Okuno, K. Ozeki, N. Sakamoto, K. Suda, H. Watanabe, T. Watanabe, Y. Watanabe, K. Yamada, H. Yamasawa
    RIKEN Nishina Center, Wako, Japan
  The RIKEN RIBF(Radioactive Isotope Beam Factory) accelerator complex has been designed and constructed to provide heavy-ion beams from D to U ions with the energy of 400 MeV/u to the maximum. Though the goal intensity is 1 particle μ amperes for the whole mass range, the intensities of very heavy-ions from Ca to U are still not satisfactory. In 2012, owing to the intensity upgrade of 48Ca beams from ECR ion source, the beam current of 48Ca was 400 pnA which was improved by factors of 2 in comparison with that in 2011. Since 2011, the new injector RILAC2 has been successfully commissioned and operated very stably for beam service time, increasing the U beam intensity by an order of magnitude. Because it was no longer realistic to use carbon foil to strip the charge of intense U beams, in 2012 the Low-Z gas stripper system instead of the standard carbon foil system has been introduced and successfully worked. To accelerate the 238U64+ beams provided by the Low-Z gas stripper, modification of the following Fixed-frequency Ring Cyclotron was performed. In 2012, 15 pnA uranium beams which was four times larger than that provided in 2011 has been achieved.  
WEXB201 Intense Highly Charged Heavy Ion Beam Production 2077
  • T. Nakagawa
    RIKEN/RARF/CC, Saitama, Japan
  With increase of applications of heavy ions in the various fields, production of intense beam of highly charged heavy ions form the ion sources become more and more important. For example, ion sources are required to produce intense dc beams of the highly charged heavy ions for the accelerator facilities of radio isotope beam production and the intense short pulsed beams for injection into synchrotrons. Additionally, in these applications, the ion sources face several important matters to be improved for meeting the requirements, such as source lifetime, reliability, current stability, and beam emittance. For these purposes, several high performance ion sources, which include ECR ion sources, electron beam ion sources and laser ion sources, for production of the intense beam (dc and pulsed) of highly charged heavy ions have been constructed and achieved remarkable breakthrough in the past decade. In this contribution, state-of-the-art ion sources for production of intense highly charged heavy ion beams are reviewed. Future perspective is also discussed.  
slides icon Slides WEXB201 [4.395 MB]