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Journal Articles

The Present conditions of the acceleration voltage after the acceleration tube update

Matsuda, Makoto; Osa, Akihiko; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; Asozu, Takuhiro

JAEA-Conf 2018-003, p.126 - 131, 2019/02

no abstracts in English

Journal Articles

Present status of JAEA-Tokai tandem accelerator

Matsuda, Makoto; Kabumoto, Hiroshi; Tayama, Hidekazu; Nakanoya, Takamitsu; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; Asozu, Takuhiro; Matsui, Yutaka; Ishizaki, Nobuhiro; et al.

Proceedings of 15th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1271 - 1275, 2018/08

The JAEA-Tokai tandem accelerator was operated over a total of 64 days, and delivered 13 different ions to the experiments in the research fields of nuclear physics, nuclear chemistry, atomic physics, solid state physics and radiation effects in material in FY2017. After the vacuum accident occurred in December 2016 the accelerating voltage dropped to 12 MV. In order to remove dust and broken carbon foil in the accelerating tube, all 80 accelerator tubes were removed and rewashed. It took 4 months for cleaning and 2 months for reassembly. Therefore about 10 months were a maintenance period of an accelerator from February 2017. Along with the reconstruction of the accelerating tube, re-alignment of the accelerating tube was carried out. The operation resumed in December 2017 and it was possible to recover the maximum voltage to 17.4 MV without beam and 16.6 MV with beam with periodic conditioning work.

Journal Articles

Present status of JAEA-Tokai tandem accelerator

Kabumoto, Hiroshi; Osa, Akihiko; Ishizaki, Nobuhiro; Tayama, Hidekazu; Matsuda, Makoto; Nakanoya, Takamitsu; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; Asozu, Takuhiro

Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1404 - 1408, 2017/12

The JAEA-Tokai tandem accelerator was operated over a total of 110 days, and delivered 22 different ions to the experiments in the research fields of nuclear physics, nuclear chemistry, atomic physics, solid state physics and radiation effects in material in FY2016. The damaged acceleration tubes by discharge were replaced with the spare tube at the regular maintenance period in March 2016, and the maximum accelerating voltage recovered to the 17 MV. However, an accident of vacuum breaking of all acceleration tubes was occurred in December, and accelerating voltage fell down to under 12 MV. Now, we are doing the maintenance to recover the performance of acceleration voltage. This paper describes the operational status of the accelerators and the major technical developments of our facility.

Journal Articles

Present status of JAEA-Tokai tandem accelerator and booster

Matsuda, Makoto; Osa, Akihiko; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; Asozu, Takuhiro

Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1413 - 1417, 2016/11

The tandem accelerator was operated over a total of 140 days and delivered 22 different ions to the experiments in the fields of nuclear physics, nuclear chemistry, atomic physics, solid state physics and radiation effects in material. Maximum accelerating voltage is keeping up 18 MV and there was used for ten days on this voltage. However, electric discharge was occurred frequently in December and accelerating voltage fell to 12 MV. The damaged acceleration tubes were replaced with the spare tube at the regular maintenance period in March. The superconducting booster was not operated. This paper describes the operational status of the accelerators and the major technical developments.

Journal Articles

Direct measurement of nanoscale lithium diffusion in solid battery materials using radioactive tracer of $$^{8}$$Li

Ishiyama, Hironobu*; Jeong, S.-C.*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Jung, H. S.*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Osa, Akihiko; Otokawa, Yoshinori; et al.

Nuclear Instruments and Methods in Physics Research B, 376, p.379 - 381, 2016/06

 Times Cited Count:2 Percentile:57.25(Instruments & Instrumentation)

Journal Articles

Present status of JAEA-Tokai tandem accelerator and booster

Matsuda, Makoto; Osa, Akihiko; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; et al.

Proceedings of 12th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.357 - 360, 2015/09

no abstracts in English

Journal Articles

The Failure example of the Tokai tandem accelerator

Matsuda, Makoto; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; Asozu, Takuhiro; et al.

Dai-27-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.142 - 145, 2015/03

no abstracts in English

Journal Articles

Nanoscale diffusion tracing by radioactive $$^{8}$$Li tracer

Ishiyama, Hironobu*; Jeong, S.-C.*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Katayama, Ichiro*; Osa, Akihiko; Otokawa, Yoshinori; et al.

Japanese Journal of Applied Physics, 53(11), p.110303_1 - 110303_4, 2014/11

 Times Cited Count:3 Percentile:78.29(Physics, Applied)

Journal Articles

Present status of JAEA-Tokai tandem accelerator and booster

Matsuda, Makoto; Osa, Akihiko; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; et al.

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.410 - 413, 2014/10

no abstracts in English

Journal Articles

Present status of JAEA-Tokai tandem accelerator and booster

Matsuda, Makoto; Osa, Akihiko; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; et al.

Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.307 - 309, 2014/06

no abstracts in English

Journal Articles

Present status of JAEA-Tokai tandem accelerator and booster

Matsuda, Makoto; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; Asozu, Takuhiro; et al.

Proceedings of 9th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.362 - 366, 2013/08

no abstracts in English

Journal Articles

Tilted-foil technique for producing a spin-polarized radioactive isotope beam

Hirayama, Yoshikazu*; Mihara, Mototsugu*; Watanabe, Yutaka*; Jeong, S. C.*; Miyatake, Hiroari*; Momota, Sadao*; Hashimoto, Takashi*; Imai, Nobuaki*; Matsuta, Kensaku*; Ishiyama, Hironobu*; et al.

European Physical Journal A, 48(5), p.54_1 - 54_10, 2012/05

 Times Cited Count:2 Percentile:77.83(Physics, Nuclear)

Journal Articles

The Earthquake-damage of the JAEA-Tokai tandem accelerator

Matsuda, Makoto; Osa, Akihiko; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; et al.

Dai-24-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.51 - 54, 2011/07

no abstracts in English

Journal Articles

Present status of JAEA-Tokai tandem accelerator facility

Ishizaki, Nobuhiro; Ishii, Tetsuro; Abe, Shinichi; Hanashima, Susumu; Osa, Akihiko; Tayama, Hidekazu; Matsuda, Makoto; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; et al.

Dai-23-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.13 - 16, 2010/11

no abstracts in English

JAEA Reports

Operation and management of the high-pressure gas facility for the tandem accelerator; Maintenance, evaluation of the aging deterioration and action of reducing SF$$_{6}$$ gas emission

Tayama, Hidekazu; Nakanoya, Takamitsu; Otokawa, Yoshinori; Tsukihashi, Yoshihiro; Seki, Nobuo*; Onodera, Teruo*; Nisugi, Hikaru*

JAEA-Technology 2010-023, 42 Pages, 2010/09

JAEA-Technology-2010-023.pdf:4.81MB

The high-pressure gas facility for the tandem accelerator at nuclear science research institute is the facility to transfer SF$$_{6}$$ gas between the accelerator and gas storage tanks. The SF$$_{6}$$ gas is used to keep high voltage insulation of the tandem accelerator. This facility is one of the largest SF$$_{6}$$ gas handling facilities in research laboratories. This facility has been operated for 31 years. In addition to regular maintenance, we have evaluated the deterioration due to aging. SF$$_{6}$$ gas is regarded as a kind of green house gases that causes global warming and it is strongly required to reduce such gas emission into the atmosphere in recent years. In JAEA, the reduction of gas the emission is also an important problem. We have been continuously taking action for reducing the emission of SF$$_{6}$$ gas. In this article, we report the records of maintenance, evaluation of aging, and activity of reducing SF$$_{6}$$ gas emission.

Journal Articles

Development of a radioactive ion beam production system at the JAEA-ISOL

Otokawa, Yoshinori; Osa, Akihiko; Sato, Tetsuya; Matsuda, Makoto

Dai-23-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.135 - 138, 2010/07

no abstracts in English

Journal Articles

Present status of JAEA-Tokai tandem accelerator facility

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

Dai-22-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.10 - 14, 2010/01

no abstracts in English

Journal Articles

Superconducting twin quarter wave resonator for acceleration of low velocity heavy ions

Kabumoto, Hiroshi; Takeuchi, Suehiro; Matsuda, Makoto; Ishizaki, Nobuhiro; Otokawa, Yoshinori

Nuclear Instruments and Methods in Physics Research A, 612(2), p.221 - 224, 2010/01

 Times Cited Count:1 Percentile:83.74(Instruments & Instrumentation)

We have designed and fabricated a superconducting twin-quarter-wave resonator (Twin-QWR) made of niobium and copper for the acceleration of low velocity heavy ions. The resonator has two inner conductors and three acceleration gaps which give a resonant frequency of 129.8 MHz and an optimum beam velocity of 6% of the light velocity. Each inner conductor resonates like in a coaxial quarter-wave line resonator. The resonator was designed to have a separable structure so that we could treat the inner conductor's part fully made of high purity niobium apart from the outer conductor made of niobium and copper. We obtained an acceleration field gradient of 5.8 MV/m at an RF power input of 4 W.

Journal Articles

Superconducting twin quarter wave resonator for acceleration of low velocity heavy ions

Kabumoto, Hiroshi; Takeuchi, Suehiro; Matsuda, Makoto; Ishizaki, Nobuhiro; Otokawa, Yoshinori

Proceedings of 14th International Conference on RF Superconductivity (SRF 2009) (Internet), p.849 - 853, 2009/11

The JAEA-Tokai tandem accelerator was built for basic science researches with heavy ions. Its superconducting booster was developed for increasing the acceleration energy of ions. We have designed and fabricated a superconducting twin-quarter-wave resonator (Twin-QWR) made of niobium and copper for the acceleration of low velocity heavy ions from TRIAC facility. The resonator has two inner conductors and three acceleration gaps which give a resonant frequency of 129.8 MHz and an optimum beam velocity of 6% of the light velocity. Each inner conductor resonates like in a coaxial quarter-wave line resonator. The resonator was designed to have a separatable structure so that we could treat the inner conductors part fully made of high purity niobium apart from the outer conductor made of niobium and copper. We obtained an acceleration field gradient of 5.8 MV/m at an RF power input of 4 W.

Journal Articles

Alignment of optical devices and the plan to install a BPM in the terminal

Asozu, Takuhiro; Matsuda, Makoto; Otokawa, Yoshinori

JAEA-Conf 2008-012, p.91 - 94, 2009/03

no abstracts in English

42 (Records 1-20 displayed on this page)