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Journal Articles

Low-background prebunching system for heavy-ion beams at the Tokai radioactive ion accelerator complex

Okada, Masashi*; Niki, Kazuaki*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Ishiyama, Hironobu*; Jeong, S. C.*; Katayama, Ichiro*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Watanabe, Yutaka*; et al.

Physical Review Special Topics; Accelerators and Beams, 15(3), p.030101_1 - 030101_10, 2012/03

 Times Cited Count:5 Percentile:32.54(Physics, Nuclear)

Journal Articles

KEKCB electron cyclotron resonance charge breeder at TRIAC

Imai, Nobuaki*; Jeong, S.-C.*; Oyaizu, Mitsuhiro*; Arai, Shigeaki*; Fuchi, Yoshihide*; Hirayama, Yoshikazu*; Ishiyama, Hironobu*; Miyatake, Hiroari; Tanaka, Masahiko*; Okada, Masashi*; et al.

Review of Scientific Instruments, 79(2), p.02A906_1 - 02A906_3, 2008/02

 Times Cited Count:13 Percentile:51.20(Instruments & Instrumentation)

KEKCB is an 18 GHz Electron Cyclotron Resonance (ECR) ion source and is a charge breeder device for converting mass-separated 1$$^+$$ radioactive ions to multi-ionized ones by utilizing an axial injection technique to the ECR plasma. It is a part of the Tokai Radioactive Ion Accelerator Complex (TRIAC) facility. Based on the developments so far, converting efficiencies for metal elements, such as barium and indium, and for gaseous elements, such as krypton and xenon, are improved to be 7 $$%$$ and 2 $$%$$, respectively. And it is confirmed that the efficiency is nearly the constant for short-lived (t$$_{1/2}$$ $$ge$$ 1 sec) isotopes. Background ions mixed in the output beams are supressed to be 600 pps from 10$$^8$$ pps by applying all aluminum electrodes and high pressure pure-water cleanings.

Journal Articles

Present status of JAEA-Tokai tandem accelerator

Matsuda, Makoto; Takeuchi, Suehiro; Tsukihashi, Yoshihiro; Hanashima, Susumu; Abe, Shinichi; Osa, Akihiko; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; et al.

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan, p.275 - 277, 2006/00

no abstracts in English

Oral presentation

Beam test of low background pre-bunch system

Okada, Masashi*; Ishiyama, Hironobu*; Katayama, Ichiro*; Niki, Kazuaki*; Miyatake, Hiroari*; Watanabe, Yutaka*; Makii, Hiroyuki; Arai, Shigeaki*

no journal, , 

no abstracts in English

Oral presentation

The RI beams from the Tokai Radioactive Ion Accelerator Complex (TRIAC)

Osa, Akihiko; Abe, Shinichi; Asozu, Takuhiro; Hanashima, Susumu; Ishii, Tetsuro; Ishizaki, Nobuhiro; Kabumoto, Hiroshi; Kutsukake, Kenichi; Matsuda, Makoto; Nakamura, Masahiko; et al.

no journal, , 

At JAEA-tandem accelerator facility, we can produce radioactive nuclei by means of proton induced uranium fission, heavy ion fusion or transfer reaction. Since TRIAC was opened for use in 2005, we have provided RNBs of fission products and $$^{8}$$Li. For the production of $$^{8}$$Li, we chose $$^{13}$$C ($$^{7}$$Li, $$^{8}$$Li) neutron transfer reaction by $$^{7}$$Li primary beam and a 99% enriched $$^{13}$$C sintered disk target. The release time of Li ions from the $$^{13}$$C sintered target/ion source system was measured to be 3.2 s. We are developing the RNB of $$^{9}$$Li (T$$_{1/2}$$=178 ms) but the long release time caused a significant loss of the beam intensity. A boron nitride target which has fast release of Li is developed for $$^{9}$$Li beam with intensity of 10$$^{4}$$ pps after separation by JAEA-ISOL.

Oral presentation

Design and test of 2-4 MHz sawtooth-wave pre-buncher for 26 MHz-RFQ

Niki, Kazuaki*; Ishiyama, Hironobu*; Katayama, Ichiro*; Miyatake, Hiroari*; Okada, Masashi*; Watanabe, Yutaka*; Makii, Hiroyuki; Arai, Shigeaki*

no journal, , 

Oral presentation

Direct measurement of astrophysical $$^8$$Li(d,t)$$^7$$Li reaction

Hashimoto, Takashi; Miyatake, Hiroari; Mitsuoka, Shinichi; Nishio, Katsuhisa; Sato, Tetsuya; Ichikawa, Shinichi; Osa, Akihiko; Matsuda, Makoto; Ishiyama, Hironobu*; Watanabe, Yutaka*; et al.

no journal, , 

no abstracts in English

Oral presentation

Direct measurements of the astrophysical $$^8$$Li(d,t),(d,p),(d,$$alpha$$) reactions

Hashimoto, Takashi; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari; Jeong, S.-C.*; Tanaka, Masahiko*; Nomura, Toru*; Okada, Masashi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Design and test of 2-4MHz pulsed-$$alpha$$ beams for measurement of $$^{12}$$C($$alpha,gamma$$) reaction

Niki, Kazuaki*; Arai, Shigeaki*; Ishiyama, Hironobu*; Okada, Masashi*; Makii, Hiroyuki; Miyatake, Hiroari; Watanabe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

KEKCB; ECR charge breeder at TRIAC

Imai, Nobuaki*; Jeong, S.-C.*; Oyaizu, Mitsuhiro*; Arai, Shigeaki*; Fuchi, Yoshihide*; Hirayama, Yoshikazu*; Ishiyama, Hironobu*; Miyatake, Hiroari; Tanaka, Masahiko*; Okada, Masashi*; et al.

no journal, , 

The KEKCB is an ECR ion source for converting singly charged ions to multi-charged ones at Tokai Radioactive Ion Accelerator Complex. By using the KEKCB, singly charged gaseous and non-gaseous ions were successfully converted to the multi-charged ones of A/q $$simeq$$7 with the efficiencies of 7% and 2% respectively. The efficiency was found to be independent of the lifetime of the radioactive nuclei with an order of second. Three collimators placed at the entrance and the exit of the KEKCB defined the beam axis and enabled us to easily handle the beam injection to the KEKCB. Griding and washing the surfaces of aluminum electrode and plasma chamber dramatically reduced the impurity originated from the ECR plasma of the KEKCB.

Oral presentation

Beam test of sawtooth-wave pre-buncher coupled to a multilayer chopper

Okada, Masashi*; Ishiyama, Hironobu*; Katayama, Ichiro*; Miyatake, Hiroari*; Niki, Kazuaki*; Watanabe, Yutaka*; Makii, Hiroyuki; Arai, Shigeaki*

no journal, , 

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