HIAT2015 - List of Authors (Fukunishi, N.)

Paper	Title	Page
MOA1I01	Review of Heavy-Ion Cyclotrons	11
	N. Fukunishi RIKEN Nishina Center, Wako, Japan
	Heavy-ion cyclotrons have contributed to nuclear physics research and various applications for more than several decades thanks to their compactness and relatively high-intensity beams. Many high-energy heavy-ion cyclotron facilities such as GANIL, MSU, RIKEN, HIRFL, Catania, were constructed in 80's and 90's and have been used actively aiming at promoting nuclear physics research, for example, studies of nuclei far from the stability line. Within these facilities, RIKEN constructed next-generation heavy-ion cyclotrons as post accelerators of the existing facility in its RI Beam Factory (RIBF) project and successfully upgraded beam energies and intensities. The present performance of RIBF is, for example, 345-MeV/nucleon 48Ca and 238U beams with the beam intensity of 530 pnA and 40 pnA, respectively. On the other hand, more compact cyclotrons have pioneered new research fields where heavy-ion cyclotrons can be applied. In this review, we will overview present performances of the existing heavy-ion facilities and discuss limitations and future possibilities of heavy-ion cyclotrons.
	Slides MOA1I01 [5.327 MB]
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MOA1C01	History of Solid Disk Improvement for Rotating Charge Stripper	17
	H. Hasebe, N. Fukunishi, H. Imao, O. Kamigaito, M. Kase, H. Kuboki, H. Okuno RIKEN Nishina Center, Wako, Japan
	In 2007, we installed a rotating disk stripper device at the final charge stripping section for the uranium (U) beam acceleration at RIKEN RI Beam Factory. The first rotating carbon disk (C-disk) stripper was useless because of its poor surface flatness and unexpected low density. In 2012, we started the stable U beam operation using beryllium (Be) as the disk material. We successfully improved the flatness of the Be-disk by special polishing technique in 2014, and the transmission efficiency was greatly improved as well. However, it seemed to be impossible that the Be-disk withstood the heat load of the expected intensity in future, considering its deformation. Then, the polishing technique for the Be-disk improvement was applied to the Glassy carbon (GC) disk. The GC-disk flatness was improved maintaining high density. In addition, a tested high-density highly oriented graphite sheet, which is fabricated from a high polymer film in high temperature and high pressure conditions, can be applied as the charge stripping disk since the better stripping efficiency and transmission value than those of Be and the C-disk were realized.
	Slides MOA1C01 [3.381 MB]
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MOPA04	New High-energy Beam Transport Line Dedicated to Biological Applications in RIKEN RI Beam Factory	42
	N. Fukunishi, T. Abe, M. Fujimaki, T. Hirano, M. Komiyama, K. Kumagai, T. Maie, Y. Watanabe RIKEN Nishina Center, Wako, Japan
	RIKEN RI Beam Factory is one of the world-leading heavy-ion facilities where nuclear physics research and application research have been conducted. One important application, performed more than twenty years at RIBF, is breeding plants and others where energetic heavy ions are used as very effective mutagens. Our previous main accelerator RIKEN Ring Cyclotron has been used for this purpose but available beam energies and resultant ion ranges are limited for medium heavy ions such as argon and iron ions. Hence, a new beam transport line delivering beams accelerated by one of our new-generation cyclotrons, RIKEN Intermediate Ring Cyclotron, to E5H experimental vault, where biological samples are irradiated in air, has been constructed. We will report design of the new beam line and the results obtained by the beam-commissioning test performed using a 160 MeV/nucleon argon beam in January 2015. We obtained performances as designed, for example, nearly 100% transmission efficiency, and a threefold increase of ion ranges. The higher-energy argon beam delivered by the new beam line was used to induce seaweed mutations immediately after the beam test.
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MOPA09	RIKEN Ring Cyclotron (RRC)	54
	Y. Watanabe, M. Fujimaki, N. Fukunishi, E. Ikezawa, O. Kamigaito, M. Kase, K. Kumagai, T. Maie, J. Ohnishi, H. Okuno, K. Ozeki, N. Sakamoto, K. Suda, S. 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
	The RIKEN Ring Cyclotron (RRC) has been in stable operation over 28 years, and has been used for supplying many types of heavy-ion beams for various experiments. Since 2007, it has also been used for supplying beams to the three Ring Cyclotrons at the Radioactive Isotope Beam Factory (RIBF). The RRC has three types of injectors: the AVF cyclotron for comparatively light ions, variable-frequency linac for heavy-ions (RILAC), and the RIKEN Heavy-ions Linac 2 (RILAC2) for using high-intensity very-heavy ions. The total operation time of the RRC is more than 4000 h/year. Recently, some problems caused by age-related deterioration have often been occurring in the RRC. Some main coils of sector magnets had a sign of layer short. Two Magnetic Deflection Channels and some electrodes of Electrostatic Deflection Channel were damaged by some beam-loss. Several leaks of vacuum have happened at a feed-through of trim coils in the E-sector, at a bellows between the Resonator No.2 and the S-sector magnet, and at some copper cooling water pipes in the Resonator No.1 and the Resonator No.2. These present statuses of the RRC are presented in this paper.
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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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MOPA27	Recent Updates on the RIKEN RI Beam Factory Control System	104
	M. Komiyama, M. Fujimaki, N. Fukunishi, K. Kumagai, A. Uchiyama RIKEN Nishina Center, Wako, Japan T. Nakamura SHI Accelerator Service Ltd., Tokyo, Japan
	RIKEN Radioactive Isotope Beam Factory (RIBF) is a heavy-ion accelerator facility producing unstable nuclei and studying their properties. The major part of the RIBF accelerator complex has been controlled by Experimental Physics and Industrial Control System (EPICS). After the first beam extraction from Superconducting Ring Cyclotron (SRC), the final stage accelerator of RIBF, in 2006, several kinds of extensions and updates have been performed in the EPICS-based RIBF control system as well as the accelerators and their components. We will here present the overview of the EPICS-based RIBF control system and its two latest updates. One is a newly installed safety system in addition to the existing two kinds of RIBF beam interlock systems following significant increase of the beam intensity extracted from the SRC. The other is development of some kinds of successors that are designed to be compatible with the existing aged controllers for magnet power supplies.
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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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Paper

Title

Page

Review of Heavy-Ion Cyclotrons

11

N. Fukunishi
RIKEN Nishina Center, Wako, Japan

Heavy-ion cyclotrons have contributed to nuclear physics research and various applications for more than several decades thanks to their compactness and relatively high-intensity beams. Many high-energy heavy-ion cyclotron facilities such as GANIL, MSU, RIKEN, HIRFL, Catania, were constructed in 80's and 90's and have been used actively aiming at promoting nuclear physics research, for example, studies of nuclei far from the stability line. Within these facilities, RIKEN constructed next-generation heavy-ion cyclotrons as post accelerators of the existing facility in its RI Beam Factory (RIBF) project and successfully upgraded beam energies and intensities. The present performance of RIBF is, for example, 345-MeV/nucleon 48Ca and 238U beams with the beam intensity of 530 pnA and 40 pnA, respectively. On the other hand, more compact cyclotrons have pioneered new research fields where heavy-ion cyclotrons can be applied. In this review, we will overview present performances of the existing heavy-ion facilities and discuss limitations and future possibilities of heavy-ion cyclotrons.

Slides MOA1I01 [5.327 MB]

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MOA1C01

History of Solid Disk Improvement for Rotating Charge Stripper

17

H. Hasebe, N. Fukunishi, H. Imao, O. Kamigaito, M. Kase, H. Kuboki, H. Okuno
RIKEN Nishina Center, Wako, Japan

In 2007, we installed a rotating disk stripper device at the final charge stripping section for the uranium (U) beam acceleration at RIKEN RI Beam Factory. The first rotating carbon disk (C-disk) stripper was useless because of its poor surface flatness and unexpected low density. In 2012, we started the stable U beam operation using beryllium (Be) as the disk material. We successfully improved the flatness of the Be-disk by special polishing technique in 2014, and the transmission efficiency was greatly improved as well. However, it seemed to be impossible that the Be-disk withstood the heat load of the expected intensity in future, considering its deformation. Then, the polishing technique for the Be-disk improvement was applied to the Glassy carbon (GC) disk. The GC-disk flatness was improved maintaining high density. In addition, a tested high-density highly oriented graphite sheet, which is fabricated from a high polymer film in high temperature and high pressure conditions, can be applied as the charge stripping disk since the better stripping efficiency and transmission value than those of Be and the C-disk were realized.

Slides MOA1C01 [3.381 MB]

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MOPA04

New High-energy Beam Transport Line Dedicated to Biological Applications in RIKEN RI Beam Factory

42

N. Fukunishi, T. Abe, M. Fujimaki, T. Hirano, M. Komiyama, K. Kumagai, T. Maie, Y. Watanabe
RIKEN Nishina Center, Wako, Japan

RIKEN RI Beam Factory is one of the world-leading heavy-ion facilities where nuclear physics research and application research have been conducted. One important application, performed more than twenty years at RIBF, is breeding plants and others where energetic heavy ions are used as very effective mutagens. Our previous main accelerator RIKEN Ring Cyclotron has been used for this purpose but available beam energies and resultant ion ranges are limited for medium heavy ions such as argon and iron ions. Hence, a new beam transport line delivering beams accelerated by one of our new-generation cyclotrons, RIKEN Intermediate Ring Cyclotron, to E5H experimental vault, where biological samples are irradiated in air, has been constructed. We will report design of the new beam line and the results obtained by the beam-commissioning test performed using a 160 MeV/nucleon argon beam in January 2015. We obtained performances as designed, for example, nearly 100% transmission efficiency, and a threefold increase of ion ranges. The higher-energy argon beam delivered by the new beam line was used to induce seaweed mutations immediately after the beam test.

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MOPA09

RIKEN Ring Cyclotron (RRC)

54

Y. Watanabe, M. Fujimaki, N. Fukunishi, E. Ikezawa, O. Kamigaito, M. Kase, K. Kumagai, T. Maie, J. Ohnishi, H. Okuno, K. Ozeki, N. Sakamoto, K. Suda, S. 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

The RIKEN Ring Cyclotron (RRC) has been in stable operation over 28 years, and has been used for supplying many types of heavy-ion beams for various experiments. Since 2007, it has also been used for supplying beams to the three Ring Cyclotrons at the Radioactive Isotope Beam Factory (RIBF). The RRC has three types of injectors: the AVF cyclotron for comparatively light ions, variable-frequency linac for heavy-ions (RILAC), and the RIKEN Heavy-ions Linac 2 (RILAC2) for using high-intensity very-heavy ions. The total operation time of the RRC is more than 4000 h/year. Recently, some problems caused by age-related deterioration have often been occurring in the RRC. Some main coils of sector magnets had a sign of layer short. Two Magnetic Deflection Channels and some electrodes of Electrostatic Deflection Channel were damaged by some beam-loss. Several leaks of vacuum have happened at a feed-through of trim coils in the E-sector, at a bellows between the Resonator No.2 and the S-sector magnet, and at some copper cooling water pipes in the Resonator No.1 and the Resonator No.2. These present statuses of the RRC are presented in this paper.

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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.

Export •

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MOPA27

Recent Updates on the RIKEN RI Beam Factory Control System

104

M. Komiyama, M. Fujimaki, N. Fukunishi, K. Kumagai, A. Uchiyama
RIKEN Nishina Center, Wako, Japan
T. Nakamura
SHI Accelerator Service Ltd., Tokyo, Japan

RIKEN Radioactive Isotope Beam Factory (RIBF) is a heavy-ion accelerator facility producing unstable nuclei and studying their properties. The major part of the RIBF accelerator complex has been controlled by Experimental Physics and Industrial Control System (EPICS). After the first beam extraction from Superconducting Ring Cyclotron (SRC), the final stage accelerator of RIBF, in 2006, several kinds of extensions and updates have been performed in the EPICS-based RIBF control system as well as the accelerators and their components. We will here present the overview of the EPICS-based RIBF control system and its two latest updates. One is a newly installed safety system in addition to the existing two kinds of RIBF beam interlock systems following significant increase of the beam intensity extracted from the SRC. The other is development of some kinds of successors that are designed to be compatible with the existing aged controllers for magnet power supplies.

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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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