HIAT2015 - List of Authors (Kotaka, Y.)

Paper	Title	Page
MOPA10	Development of Low-Energy Heavy-Ion Beams by the RIKEN AVF Cyclotron and Hyper ECR Ion Source of CNS	58
	Y. Kotaka, N. Imai, H. Muto, Y. Ohshiro, S. Shimoura, S.-I. Watanabe, H. Yamaguchi CNS, Saitama, Japan A. Goto Yamagata University, Yamagata, Japan K. Hatanaka RCNP, Osaka, Japan M. Kase, S. Kubono RIKEN Nishina Center, Wako, Japan
	The application of low-energy heavy-ion beams enhances production of radioisotope (RI) and studies of nuclear astrophysics.　The Center for Nuclear Study (CNS) of the University of Tokyo and RIKEN Nishina Center have been developing the RIKEN AVF Cyclotron (AVF) and the Hyper ECR Ion Source (IS) of CNS to expand available ions and their acceleration energies as well as to increase the beam intensity for studies at the low-energy RI beam separator CRIB * and others. Renovation of central region of the AVF expands the acceptance of injection beam, so that 4He beam is now available at a higher energy of 12.5MeV/u under the constraint that the maximal Dee voltage is 50kV. Intensities of metallic ions extracted from the IS have been increased by developing three kinds of vaporization methods, multi-hole micro-oven, non-axial rod and MIVOC. Plasma spectroscopy is applied to monitor the intensities of highly charged ions in the IS. For systematic study of transport efficiencies, several beam diagnostic devices have been added. One key device is a set of a multi-hole slit and a viewer of the beam image (pepper-pot emittance monitor ), which gives four-dimensional phase space. Y. Yanagisawa et al., Nucl. Instr. and Meth. Phys. Res. A539 (2005) 74 H. Muto et al., Rev. Sci. Instr. 85 (2014) 02A905 * T. Hoffmann et al., Proc. 9th BIW2000, Cambridge, USA, PP.432-439
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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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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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WEPB29	Observation of Sublimation Effect of Mg and Ti Ions at the Hyper-Electron Cyclotron Resonance Ion Source	262
	H. Muto, Y. Kotaka, S. Kubono, Y. Ohshiro, S. Shimoura, S.-I. Watanabe, H. Yamaguchi, S. Yamaka CNS, Saitama, Japan T. Hattori NIRS, Chiba-shi, Japan M. Kase, S. Kubono RIKEN Nishina Center, Wako, Japan K. Kobayashi, M. Nishimura SHI Accelerator Service Ltd., Tokyo, Japan M. Oyaizu KEK, Ibaraki, Japan
	Light intensities of a grating monochromator during plasma chamber baking and 24Mg⁸⁺ and 48Ti¹³⁺ beam operation were observed at the Hyper-Electron Cyclotron Resonance ion source. During chamber baking almost all light intensities were Fe I and Fe II. However, when MgO or TiO2 rod was inserted into the plasma and the beam operation was started the light intensity spectrum was drastically changed and most of the Fe I and Fe II lights were disappeared and Mg or Ti light intensities were coming out. In this paper we describe vacuum conditions of ECR ion source during chamber baking and beam tuning.
	Poster WEPB29 [7.060 MB]
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Paper

Title

Page

Development of Low-Energy Heavy-Ion Beams by the RIKEN AVF Cyclotron and Hyper ECR Ion Source of CNS

58

Y. Kotaka, N. Imai, H. Muto, Y. Ohshiro, S. Shimoura, S.-I. Watanabe, H. Yamaguchi
CNS, Saitama, Japan
A. Goto
Yamagata University, Yamagata, Japan
K. Hatanaka
RCNP, Osaka, Japan
M. Kase, S. Kubono
RIKEN Nishina Center, Wako, Japan

The application of low-energy heavy-ion beams enhances production of radioisotope (RI) and studies of nuclear astrophysics.　The Center for Nuclear Study (CNS) of the University of Tokyo and RIKEN Nishina Center have been developing the RIKEN AVF Cyclotron (AVF) and the Hyper ECR Ion Source (IS) of CNS to expand available ions and their acceleration energies as well as to increase the beam intensity for studies at the low-energy RI beam separator CRIB * and others. Renovation of central region of the AVF expands the acceptance of injection beam, so that 4He beam is now available at a higher energy of 12.5MeV/u under the constraint that the maximal Dee voltage is 50kV. Intensities of metallic ions extracted from the IS have been increased by developing three kinds of vaporization methods, multi-hole micro-oven, non-axial rod and MIVOC. Plasma spectroscopy ** is applied to monitor the intensities of highly charged ions in the IS. For systematic study of transport efficiencies, several beam diagnostic devices have been added. One key device is a set of a multi-hole slit and a viewer of the beam image (pepper-pot emittance monitor ***), which gives four-dimensional phase space.
* Y. Yanagisawa et al., Nucl. Instr. and Meth. Phys. Res. A539 (2005) 74
** H. Muto et al., Rev. Sci. Instr. 85 (2014) 02A905
*** T. Hoffmann et al., Proc. 9th BIW2000, Cambridge, USA, PP.432-439

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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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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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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

WEPB29

Observation of Sublimation Effect of Mg and Ti Ions at the Hyper-Electron Cyclotron Resonance Ion Source

262

H. Muto, Y. Kotaka, S. Kubono, Y. Ohshiro, S. Shimoura, S.-I. Watanabe, H. Yamaguchi, S. Yamaka
CNS, Saitama, Japan
T. Hattori
NIRS, Chiba-shi, Japan
M. Kase, S. Kubono
RIKEN Nishina Center, Wako, Japan
K. Kobayashi, M. Nishimura
SHI Accelerator Service Ltd., Tokyo, Japan
M. Oyaizu
KEK, Ibaraki, Japan

Light intensities of a grating monochromator during plasma chamber baking and 24Mg⁸⁺ and 48Ti¹³⁺ beam operation were observed at the Hyper-Electron Cyclotron Resonance ion source. During chamber baking almost all light intensities were Fe I and Fe II. However, when MgO or TiO2 rod was inserted into the plasma and the beam operation was started the light intensity spectrum was drastically changed and most of the Fe I and Fe II lights were disappeared and Mg or Ti light intensities were coming out. In this paper we describe vacuum conditions of ECR ion source during chamber baking and beam tuning.

Poster WEPB29 [7.060 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)