Author: Watanabe, T.
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MOPA12 Status Report of the Operation of the RIKEN AVF Cyclotron 65
 
  • K. Suda, M. Fujimaki, N. Fukunishi, T. Kageyama, O. Kamigaito, M. Kase, M. Komiyama, K. Kumagai, T. Maie, M. Nagase, T. Nagatomo, T. Nakagawa, H. Okuno, N. Sakamoto, A. Uchiyama, T. Watanabe, Y. Watanabe, K. Yamada
    RIKEN Nishina Center, Wako, Japan
  • S. Fukuzawa, M. Hamanaka, S. Ishikawa, K. Kobayashi, R. Koyama, T. Nakamura, M. Nishida, M. Nishimura, J. Shibata, N. Tsukiori, K. Yadomi
    SHI Accelerator Service Ltd., Tokyo, Japan
  • Y. Kotaka, Y. Ohshiro, S. Yamaka
    CNS, Saitama, Japan
  
  The RIKEN AVF cyclotron was commissioned in 1989. Since then, it has been operated as an injector for the RIKEN ring cyclotron. The AVF cyclotron also provides low energy ion beams for the Radio-Isotope Beam separator (CRIB) of the Center for Nuclear Study (CNS), the University of Tokyo, as well as to produce RIs for commercial use. The operating time is more than 3,000 hours per year. We will report the operating status (nuclear species, energy, supply destination of accelerated ions), troubles, maintenance work, and the improvement of ion sources and diagnostics tools for the period from August 2014 to July 2015.  
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MOPA24 Performance of a Resonant Schottky Pick-up in the Commissioning of Rare-RI Ring 98
 
  • F. Suzaki, D. Nagae, S. Naimi, T. Uesaka, M. Wakasugi, T. Watanabe, K. Yamada, Y. Yano, J. Zenihiro
    RIKEN Nishina Center, Wako, Japan
  • Y. Abe, Y. Yamaguchi
    RIKEN, Saitama, Japan
  • Z. Ge
    IMP/CAS, Lanzhou, People's Republic of China
  • K. Hiraishi, Y. Ichikawa, A. Ozawa, S. Suzuki, Y. Tajiri
    University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan
  • I. Kato, H. Miura, T. Nishimura, S. Omika, T. Suzuki, N. Tadano, Y. Takeuchi, T. Yamaguchi
    Saitama University, Saitama, Japan
  • T. Moriguchi
    UTTAC, Tsukuba, Ibaraki, Japan
  
  Rare-RI Ring *, ** is a storage ring dedicated for precise mass measurements of unstable nuclei to make clear the astrophysical r-process path. We employ the Isochronous mass spectrometry method in the order of 10-6. For precise tuning of the isochronous field, we developed a resonant Schottky pick-up which had a resonant cavity. We acquired the quantities by the offline test: shunt impedance, and unloaded quality factor. Using the quantities, we estimated the output signal power which is corresponding to a single ion with charge q on resonance ***. Comparing to thermal noise, present Schottky pick-up can detect a single ion with charge over 16. In June, we carried out the first commissioning of Rare-RI Ring using 78Kr38+ beam with the energy of 167 MeV/nucleon. By using the individual injection method with the fast kicker system, we succeeded in injecting, storing, and extracting 78Kr38+ ions. The Schottky pick-up successfully detected single 78Kr38+ ions. Also we confirmed that 78Kr38+ was stored for more than 2 seconds in a vacuum of 10-5 Pa. In this contribution, we will present recent status of the Schottky pick-up focusing on the results of the experiment.
* Y. Yamaguchi et al., Nucl. Instr. Meth. B 317 (2013) 629.
** A. Ozawa et al., Prog. Theor. Exp. Phys. 2012 (2012) 03C009.
*** F. Nolden et al., Nucl. Instr. Meth. A 659 (2011) 69. 		 
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WEPB01 Status Report on the Operation of the RIBF Ring Cyclotrons 191
 
  • K. Ozeki, T. Dantsuka, M. Fujimaki, T. Fujinawa, N. Fukunishi, H. Hasebe, Y. Higurashi, E. Ikezawa, H. Imao, T. Kageyama, O. Kamigaito, M. Kase, M. Kidera, M. Komiyama, K. Kumagai, T. Maie, M. Nagase, T. Nagatomo, T. Nakagawa, M. Nakamura, J. Ohnishi, H. Okuno, N. Sakamoto, K. Suda, A. Uchiyama, S. Watanabe, T. Watanabe, Y. Watanabe, K. Yamada, H. Yamasawa
    RIKEN Nishina Center, Wako, Japan
  • S. Fukuzawa, M. Hamanaka, S. Ishikawa, K. Kobayashi, R. Koyama, T. Nakamura, M. Nishida, M. Nishimura, J. Shibata, N. Tsukiori, K. Yadomi
    SHI Accelerator Service Ltd., Tokyo, Japan
  • Y. Kotaka
    CNS, Saitama, Japan
  
  Operational status of four ring cyclotrons (RRC, fRC, IRC, SRC) from August 2014 to July 2015 is reported. We are engaging in the improvements and adjustments for increasing beam intensities year after year, and maintenances for the stabilization of beam supply. In these contributions, we will report the past performances of accelerated beams, statistics of operational and tuning time on corresponding period, as well as failures and copings with them.  
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