Cyclotrons2016 - List of Authors (Ohnishi, J.)

Paper	Title	Page
MOA01	Operational Experience and Upgrade Plans of the RIBF Accelerator Complex	1
	H. Okuno, T. Dantsuka, M. Fujimaki, N. Fukunishi, H. Hasebe, Y. Higurashi, E. Ikezawa, H. Imao, O. Kamigaito, M. Kidera, M. Komiyama, K. Kumagai, T. Maie, M. Nagase, T. Nagatomo, T. Nakagawa, M. Nakamura, J. Ohnishi, K. Ozeki, N. Sakamoto, K. Suda, A. Uchiyama, S. Watanabe, T. Watanabe, Y. Watanabe, K. Yamada, H. Yamasawa RIKEN Nishina Center, Wako, Japan
	The Radioactive Isotope Beam Factory (RIBF) is the cyclotron based accelerator facility for nuclear science, completed in the end of 2006. Now RIBF can provide the most intense RI beams. Continuous efforts since the first beam has increased the beam intensity and made stable operation. In 2016, 49.8 pnA (3×10¹¹/sec) of uranium ion beam could be extracted from the final accelerator SRC with energy of 345 MeV/u. An intensity upgrade program has been proposed to increase the intensity of uranium ion by more than twenty. The program includes two subjects. First, space charge limit of the beam intensity in the low energy ring cyclotron (RRC) should be increased by replacing the existing resonators with the new one to get higher accelerating voltage. The second is skip of the first stripper, requiring a new ring cyclotron (FRC) just after the first stripper to increase the maximum magnetic rigidity so as to accept low charge state. This presentation show a conceptual design of the new cyclotron with some issues to realize the intensity upgrade.
	Slides MOA01 [8.610 MB]
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THP13	Study on Energy Upgrade and Beam Transmission Efficiencies for RIKEN K-70 AVF Cyclotron	332
	J. Ohnishi, A. Goto, M. Kase RIKEN Nishina Center, Wako, Japan Y. Kotaka CNS, Saitama, Japan
	The RIKEN K-70 AVF cyclotron has been operated since 1989 and is used as a stand-alone machine and an injector to the RI-beam factory (RIBF). It is operated only in the RF harmonics (H) equal to 2 presently, and the maximum beam energies are restricted to be within 14 MeV for protons and 12.5 MeV/u for M/Q = 2 ions. In order to meet the usersÂ’ requests of beam energy upgrade, the beam simulation studies on the H=1 operation were made, and the central region was modified; these results were already reported in this conference of 2010. In this paper, we will analyze the difference in the transmission efficiency between the beam simulation and measured data in the H=2 operation after the modification of the central region. Moreover, we will also mention the result on the acceleration test of protons at higher energies in the H=1 operation.
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Paper

Title

Page

Operational Experience and Upgrade Plans of the RIBF Accelerator Complex

1

H. Okuno, T. Dantsuka, M. Fujimaki, N. Fukunishi, H. Hasebe, Y. Higurashi, E. Ikezawa, H. Imao, O. Kamigaito, M. Kidera, M. Komiyama, K. Kumagai, T. Maie, M. Nagase, T. Nagatomo, T. Nakagawa, M. Nakamura, J. Ohnishi, K. Ozeki, N. Sakamoto, K. Suda, A. Uchiyama, S. Watanabe, T. Watanabe, Y. Watanabe, K. Yamada, H. Yamasawa
RIKEN Nishina Center, Wako, Japan

The Radioactive Isotope Beam Factory (RIBF) is the cyclotron based accelerator facility for nuclear science, completed in the end of 2006. Now RIBF can provide the most intense RI beams. Continuous efforts since the first beam has increased the beam intensity and made stable operation. In 2016, 49.8 pnA (3×10¹¹/sec) of uranium ion beam could be extracted from the final accelerator SRC with energy of 345 MeV/u. An intensity upgrade program has been proposed to increase the intensity of uranium ion by more than twenty. The program includes two subjects. First, space charge limit of the beam intensity in the low energy ring cyclotron (RRC) should be increased by replacing the existing resonators with the new one to get higher accelerating voltage. The second is skip of the first stripper, requiring a new ring cyclotron (FRC) just after the first stripper to increase the maximum magnetic rigidity so as to accept low charge state. This presentation show a conceptual design of the new cyclotron with some issues to realize the intensity upgrade.

Slides MOA01 [8.610 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP13

Study on Energy Upgrade and Beam Transmission Efficiencies for RIKEN K-70 AVF Cyclotron

332

J. Ohnishi, A. Goto, M. Kase
RIKEN Nishina Center, Wako, Japan
Y. Kotaka
CNS, Saitama, Japan

The RIKEN K-70 AVF cyclotron has been operated since 1989 and is used as a stand-alone machine and an injector to the RI-beam factory (RIBF). It is operated only in the RF harmonics (H) equal to 2 presently, and the maximum beam energies are restricted to be within 14 MeV for protons and 12.5 MeV/u for M/Q = 2 ions. In order to meet the usersÂ’ requests of beam energy upgrade, the beam simulation studies on the H=1 operation were made, and the central region was modified; these results were already reported in this conference of 2010. In this paper, we will analyze the difference in the transmission efficiency between the beam simulation and measured data in the H=2 operation after the modification of the central region. Moreover, we will also mention the result on the acceleration test of protons at higher energies in the H=1 operation.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)