Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 53

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Development of intense high-energy noble gas ion beams from the in-terminal ion injector of tandem accelerator using an ECR ion source

Matsuda, Makoto; Nakanoya, Takamitsu; Hanashima, Susumu; Takeuchi, Suehiro

Nuclear Instruments and Methods in Physics Research A, 654(1), p.45 - 51, 2011/10

 Times Cited Count:4 Percentile:36.36(Instruments & Instrumentation)

In order to develop new beam species of highly charged noble gas ions, we have constructed an in-terminal heavy ion injector in the JAEA-Tokai tandem accelerator using a compact ECR ion source. This work was associated with a lot of development to operate the ion source on the 20UR Pelletron high voltage terminal in high pressure SF$$_{6}$$ gas environment. Highly charged ions of N, O, Ne, Ar, Kr and Xe have been accelerated satisfactorily. Operating data integrated during many years long beam delivery service are summarized.

Journal Articles

Recovery of acceleration field gradients of superconducting booster resonators by high pressure water jet rinsing

Kabumoto, Hiroshi; Takeuchi, Suehiro; Ishizaki, Nobuhiro; Yoshida, Takahiro*; Ishiguro, Takayuki*; Yamaguchi, Kazushi*

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.1120 - 1122, 2010/03

The JAEA-Tokai tandem accelerator was built for basic science researches with heavy ions. Its superconducting booster was completed in 1994 for increasing the acceleration energy of ions. The booster consists of 40 superconducting acceleration resonators and 10 cryostats. Every resonator is a coaxial quarter wave resonator (QWR) of which frequency is 129.8MHz, and optimum beam velocity is 10% of the light velocity. When it was built, the acceleration field gradients of superconducting resonators were 5.0MV/m at RF power input of 4W on their average. The performance decrease little by little, and it become 4.0MV/m now. Some of the resonators generate X-rays from a low electric field. A field emission will be occurred from small contaminations accumulated on the surfaces of niobium. We examined the high pressure water jet rinsing (HPWR) to re-recondition the superconducting booster. The HPWR is the technology of removing small contaminations on resonator surfaces, and very effective for the improvement of acceleration field gradients. The acceleration field gradients of 20 on-line resonators were improved from 4.4MV to 5.7MV on their average.

Journal Articles

Use of an ECR ion source in the large electrostatic accelerator

Matsuda, Makoto; Asozu, Takuhiro; Kutsukake, Kenichi; Nakanoya, Takamitsu; Hanashima, Susumu; Takeuchi, Suehiro

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.827 - 829, 2010/03

no abstracts in English

Journal Articles

Recovery of acceleration field gradients of superconducting booster resonators by high pressure water jet rinsing

Kabumoto, Hiroshi; Takeuchi, Suehiro; Ishizaki, Nobuhiro; Yoshida, Takahiro*; Ishiguro, Takayuki*; Yamaguchi, Kazushi*

Dai-22-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.129 - 132, 2010/01

The JAEA-Tokai tandem accelerator was built for basic science researches with heavy ions. Its superconducting booster was completed in 1994 for increasing the acceleration energy of ions. The booster consists of 40 superconducting acceleration resonators and 10 cryostats. Every resonator is a coaxial quarter wave resonator (QWR) of which frequency is 129.8 MHz, and optimum beam velocity is 10% of the light velocity. When it was built, the acceleration field gradients of superconducting resonators were 5.0 MV/m at RF power input of 4 W on their average. The performance decrease little by little, and it become 4.0 MV/m now. Some of the resonators generate X-rays from a low electric field. A field emission will be occurred from small contaminations accumulated on the surfaces of niobium. We examined the high pressure water jet rinsing (HPWR) to re-recondition the superconducting booster. The HPWR is the technology of removing small contaminations on resonator surfaces, and very effective for the improvement of acceleration field gradients. The acceleration field gradients of 20 on-line resonators were improved from 4.4 MV to 5.7 MV on their average.

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:14.75(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

Highly charged ion injector in the terminal of tandem accelerator

Matsuda, Makoto; Asozu, Takuhiro; Nakanoya, Takamitsu; Kutsukake, Kenichi; Hanashima, Susumu; Takeuchi, Suehiro

Journal of Physics; Conference Series, 163, p.012112_1 - 012112_4, 2009/06

 Times Cited Count:3 Percentile:76.56

Journal Articles

The World-largest class tandem accelerator at JAEA-Tokai as a driver of basic research on nuclear energy

Takeuchi, Suehiro; Chiba, Satoshi; Nagame, Yuichiro

Kaku Deta Nyusu (Internet), (93), p.42 - 45, 2009/06

Since 1982, the tandem accelerator at JAEA-Tokai has been steadily providing various ion beams for basic researches on nuclear energy, open to the world for the utilization, and continuously upgraded. Its historic contribution to the basic research was appreciated by Atomic Energy Society of Japan as a historic landmark in nuclear energy. There have been a lot of activities in taking nuclear data at the facility also. This article is written, for Nuclear Data News from Nuclear Data Center, about the history of the tandem accelerator facility, its developments and utilization, nuclear data measurement for the development of nuclear fusion reactors and their contribution to JENDL-3 and -4, discoveries of new 17 isotopes among rare-earths and actinoides, effects of electric excitation in various solid-state matters under heavy-ion irradiation and so on.

Journal Articles

Development of low $$beta$$ superconducting twin quarter wave resonator

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

JAEA-Conf 2008-005, p.137 - 140, 2008/03

no abstracts in English

Journal Articles

Present status of JAEA-Tokai tandem accelerator

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

JAEA-Conf 2008-005, p.42 - 45, 2008/03

In FY2006, a tandem accelerator was operated for 201days. The maximum voltage was 18 MV and the accelerated ion species was 19 elements (26 nuclides). As the trouble case which occurred previous year, the change of the beam shape occurred often in the injection beam line of the tandem accelerator. The cause was the contact failure of the pole connector of the electrostatics quadrupole lens. Generally, it was difficult to confirm the connection status of the opened pole but we specified a connection abnormal part by the capacitive coupling method. This technique is useful technology which can be applied to the other electrostatics optics elements. Because the charging electric current flowed only about usual about 60% and the terminal voltage became unstable, we opened a tank and checked the charging system. As a result, a problem was confirmed to the damaging of resistance and the installation of the cable. In the seminar, the operation, maintenance and the accelerator development of the tandem accelerator in FY2006 are described.

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.

Dai-19-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.9 - 12, 2007/01

no abstracts in English

Journal Articles

Performance test of low beta superconducting twin quarter wave resonator

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

Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.469 - 471, 2007/00

JAEA and KEK have started acceleration of radioactive nuclear beam (RNB) and stable ion beam (SNB) from Tokai Radioactive Ion Accelerator Complex (TRIAC) in 2005. RNB and SNB are accelerated by SCRFQ and IH linac up to the energy of 1.1 MeV/u. We were planning to re-accelerate the beams in the future by superconducting booster up to energy of 5-8 MeV/u. In order to inject the beams into superconducting booster, we need a pre-booster which is capable of acceleration from 1.1 MeV/u to 2.0 MeV/u. We have started development of superconducting twin quarter wave resonator (Twin-QWR), and have fabricated a prototype Twin-QWR in FY2005. We have carried out performance test of prototype Twin-QWR in FY2006.

Journal Articles

Development of the heavy ion injector in the high voltage terminal

Matsuda, Makoto; Nakanoya, Takamitsu; Kutsukake, Kenichi; Hanashima, Susumu; Takeuchi, Suehiro

Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.736 - 738, 2007/00

no abstracts in English

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

Journal Articles

Development of superconducting twin quarter wave resonator for acceleration of low velocity heavy ions

Kabumoto, Hiroshi; Takeuchi, Suehiro; Matsuda, Makoto; Iijima, Akihiko*; Yoshida, Takahiro*; Usami, Takahiro*; Hida, Tetsushi*

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.819 - 821, 2006/00

JAEA and KEK have started acceleration of radioactive nuclear beam (RNB) and stable ion beam (SNB) from TRIAC. RNB and SNB are accelerated by SCRFQ and IH linac up to the energy of 1.1MeV/u. We were planning to re-accelerate the beams in the future by superconducting booster up to an energy of 5$$sim$$8MeV/u. In order to inject the beams into superconducting booster, we need a pre-booster which is capable of acceleration from 1.1MeV/u to 2.0MeV/u. We have started development of superconducting twin quarter wave resonator (twin-QWR) in FY2004, and have fabricated a prototype twin-QWR in FY2005.

Journal Articles

Status report of the JAERI tandem accelerator

Matsuda, Makoto; Takeuchi, Suehiro; Tsukihashi, Yoshihiro; Horie, Katsuzo*; Ouchi, Isao*; Hanashima, Susumu; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; et al.

Dai-18-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.11 - 14, 2005/11

no abstracts in English

Journal Articles

Reseach and development of superconducting twin quarter wave resonator for the acceleration of low velocity heavy ions

Kabumoto, Hiroshi; Takeuchi, Suehiro; Matsuda, Makoto; Nakanoya, Takamitsu

Dai-17-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.135 - 137, 2004/06

no abstracts in English

Journal Articles

Status report on the JAERI tandem accelerator facility

Matsuda, Makoto; Takeuchi, Suehiro; Tsukihashi, Yoshihiro; Horie, Katsuzo; Ouchi, Isao; Hanashima, Susumu; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; et al.

Dai-17-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.1 - 4, 2004/00

no abstracts in English

Journal Articles

Safety issues in TRIAC facility

Nakanoya, Takamitsu; Abe, Shinichi; Matsuda, Makoto; Nishio, Katsuhisa; Hanashima, Susumu; Ichikawa, Shinichi; Tsukihashi, Yoshihiro; Takeuchi, Suehiro; Ishiyama, Hironobu*; Jeong, S.-C.*; et al.

Dai-17-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.123 - 126, 2004/00

no abstracts in English

Journal Articles

Improvement of high-voltage performance of acceleration tubes by cleaning the walls with a high-pressure water jet

Takeuchi, Suehiro; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Yoshida, Tadashi

Nuclear Instruments and Methods in Physics Research A, 513(3), p.429 - 438, 2003/11

 Times Cited Count:2 Percentile:21.84(Instruments & Instrumentation)

At the JAERI Tandem accelerator, an acceleration tube replacing plan is proceeding to increase the acceleration voltage toward 20 MV. Lengthy conditioning is generally necessary for a large tube system. We had an idea to clean the tubes with high-pressure water-jet rinsing before installation. We cleaned tubes and tested them at 1 MV and 3 MV. The both results exhibited that the voltages went beyond the rated voltages and discharge activities were much less than the old records. During the test of new tubes at 3 MV, the conditioning proceeded well and an extremely stable condition was fulfilled within 24 hours. In conclusion, the cleaning was found to be a very promising way to improve high-voltage performance of the tubes in a large tube system.

53 (Records 1-20 displayed on this page)