IPAC2014 - List of Authors (Kuboki, H.)

Paper	Title	Page
MOPRI082	Acceleration of High-Intensity Heavy-Ion Beams at RIKEN RI Beam Factory	800
	O. Kamigaito, T. Dantsuka, M. Fujimaki, N. Fukunishi, H. Hasebe, Y. Higurashi, E. Ikezawa, H. Imao, M. Kase, M. Kidera, M. Komiyama, H. Kuboki, K. Kumagai, T. Maie, T. Nakagawa, M. Nakamura, J. Ohnishi, H. Okuno, K. Ozeki, N. Sakamoto, K. Suda, T. Watanabe, Y. Watanabe, K. Yamada, H. Yamasawa RIKEN Nishina Center, Wako, Japan T. Nagatomo RIKEN, Saitama, Japan
	Recent efforts concerning the RIBF accelerators in RIKEN have been directed towards achieving higher beam intensities of very heavy ions such as uranium and xenon. As presented in the last IPAC conference in 2013, the intensities of these ion beams have significantly improved due to the construction of a new injector, RILAC2, which is equipped with a 28-GHz superconducting ECR ion source, the development of a helium gas stripper, and upgrading of the bending power of the fRC. In this light, this paper presents the subsequent upgrade programs carried out in the last couple of years, such as developments of a new air stripper for xenon beams and a micro-oven for metallic ions. The current performance level of the RIBF accelerator complex, as well as a future plan to further increase the beam intensities, are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI082
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THPME067	Air Stripper for Intense Heavy Ion Beams	3388
	H. Imao RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama, Japan M. Fujimaki, N. Fukunishi, H. Hasebe, O. Kamigaito, M. Kase, H. Kuboki, H. Okuno, Y. Yano RIKEN Nishina Center, Wako, Japan
	Intensity upgrade of very heavy ions such as uranium or xenon beams is one of the main concerns at the RIKEN Radioactive Isotope Beam Factory (RIBF). The lifetime problem of carbon-foil strippers due to the high energy loss of beams was a principal bottleneck for the intensity upgrade. We have already developed and successfully operated a re-circulating He-gas stripper for 10-MeV/u uranium beams as an alternative to carbon foils. Recently, the 2nd gas stripper with air dedicated for 50-MeV/u ¹²⁴Xe beams was developed. The differential pumping techniques similar to that used in the He gas stripper was applied. We confined a very thick gas target, up to 20~mg/cm² of air, in a 0.5-m target chamber. One good feature of using air is that it can be inexhaustible for our use. The stripper was stably operated in user runs performed in June 2013. The service rate reached 91\%. The maximum beam intensity reached 38~pnA and the average intensity provided to users becomes approximately four times higher than it was in 2012. The down-time free gas strippers greatly contributed to these improvements. We also discuss the applicability of the air stripper to 50-MeV/u ²³⁸U beams.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME067
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Paper

Title

Page

Acceleration of High-Intensity Heavy-Ion Beams at RIKEN RI Beam Factory

800

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

Recent efforts concerning the RIBF accelerators in RIKEN have been directed towards achieving higher beam intensities of very heavy ions such as uranium and xenon. As presented in the last IPAC conference in 2013, the intensities of these ion beams have significantly improved due to the construction of a new injector, RILAC2, which is equipped with a 28-GHz superconducting ECR ion source, the development of a helium gas stripper, and upgrading of the bending power of the fRC. In this light, this paper presents the subsequent upgrade programs carried out in the last couple of years, such as developments of a new air stripper for xenon beams and a micro-oven for metallic ions. The current performance level of the RIBF accelerator complex, as well as a future plan to further increase the beam intensities, are also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI082

Export •

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

THPME067

Air Stripper for Intense Heavy Ion Beams

3388

H. Imao
RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama, Japan
M. Fujimaki, N. Fukunishi, H. Hasebe, O. Kamigaito, M. Kase, H. Kuboki, H. Okuno, Y. Yano
RIKEN Nishina Center, Wako, Japan

Intensity upgrade of very heavy ions such as uranium or xenon beams is one of the main concerns at the RIKEN Radioactive Isotope Beam Factory (RIBF). The lifetime problem of carbon-foil strippers due to the high energy loss of beams was a principal bottleneck for the intensity upgrade. We have already developed and successfully operated a re-circulating He-gas stripper for 10-MeV/u uranium beams as an alternative to carbon foils. Recently, the 2nd gas stripper with air dedicated for 50-MeV/u ¹²⁴Xe beams was developed. The differential pumping techniques similar to that used in the He gas stripper was applied. We confined a very thick gas target, up to 20~mg/cm² of air, in a 0.5-m target chamber. One good feature of using air is that it can be inexhaustible for our use. The stripper was stably operated in user runs performed in June 2013. The service rate reached 91\%. The maximum beam intensity reached 38~pnA and the average intensity provided to users becomes approximately four times higher than it was in 2012. The down-time free gas strippers greatly contributed to these improvements. We also discuss the applicability of the air stripper to 50-MeV/u ²³⁸U beams.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME067

Export •

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