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Journal Articles

Research and development of fusion grid infrastructure based on Atomic Energy Grid InfraStructure (AEGIS)

Suzuki, Yoshio; Nakajima, Kohei; Kushida, Noriyuki; Kino, Chiaki; Aoyagi, Tetsuo; Nakajima, Norihiro; Iba, Katsuyuki*; Hayashi, Nobuhiko; Ozeki, Takahisa; Totsuka, Toshiyuki; et al.

Fusion Engineering and Design, 83(2-3), p.511 - 515, 2008/04

 Times Cited Count:3 Percentile:25.63(Nuclear Science & Technology)

In collaboration with the Naka Fusion Institute of Japan Atomic Energy Agency (NFI/JAEA) and the National Institute for Fusion Science of National Institute of Natural Science (NIFS/NINS), Center for Computational Science and E-systems of Japan Atomic Energy Agency (CCSE/JAEA) aims at establishing an integrated framework for experiments and analyses in nuclear fusion research based on the Atomic Energy Grid InfraStructure (AEGIS). AEGIS has been being developed by CCSE/JAEA aiming at providing the infrastructure that enables atomic energy researchers in remote locations to carry out R&D efficiently and collaboratively through the Internet. Toward establishing the integrated framework, we have been applying AEGIS to pre-existing three systems.

Journal Articles

Extended steady-state and high-beta regimes of net-current free heliotron plasmas in the Large Helical Device

Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Muto, Takashi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.

Nuclear Fusion, 47(10), p.S668 - S676, 2007/10

 Times Cited Count:34 Percentile:76.72(Physics, Fluids & Plasmas)

The performance of net-current free heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fuelling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an internal diffusion barrier (IDB) by a combination of efficient pumping of the local island divertor function and core fuelling by pellet injection has realized a super dense core as high as 5$$times$$10$$^{20}$$ m$$^{-3}$$, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5% and a discharge duration of 54 min with a total input energy of 1.6 GJ (490 kW on average) are also highlighted. The progress of LHD experiments in these two years is overviewed by highlighting IDB, high-beta and long pulse.

Journal Articles

Extended steady-state and high-beta regimes of net-current free heliotron plasmas in the large helical device

Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Muto, Takashi*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.

Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 12 Pages, 2007/03

The performance of net-current free Heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fueling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an Internal Diffusion Barrier (IDB) by combination of efficient pumping of the local island divertor function and core fueling by pellet injection has realized a super dense core as high as 5$$times$$10$$^{20}$$m$$^{-3}$$, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5 % and a discharge duration of 54-min. with a total input energy of 1.6 GJ (490 kW in average) are also highlighted. The progress of LHD experiments in these two years is overviewed with highlighting IDB, high $$beta$$ and long pulse.

Journal Articles

Progress in microwave diagnostics and physics issues in magnetically confined plasmas

Mase, Atsushi*; Kogi, Yuichiro*; Hojo, Hitoshi*; Yoshikawa, Masayuki*; Itakura, Akiyoshi*; Chujo, T.*; Tokuzawa, Tokihiko*; Kawahata, Kazuo*; Nagayama, Yoshio*; Oyama, Naoyuki; et al.

Fusion Science and Technology, 51(2T), p.52 - 57, 2007/02

 Times Cited Count:3 Percentile:26.87(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Observation of localized oscillations at ${it m/n}$=2/1 rational surface during counter neutral beam injection in the large helical device

Isayama, Akihiko; Inagaki, Shigeru*; Watanabe, Kiyomasa*; Narushima, Yoshiro*; Sakakibara, Satoru*; Funaba, Hisamichi*; Ida, Katsumi*; Nagayama, Yoshio*; Yamada, Hiroshi*; Kawahata, Kazuo*; et al.

Plasma Physics and Controlled Fusion, 48(1), p.L45 - L55, 2006/04

 Times Cited Count:12 Percentile:41.63(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Comparison of transient electron heat transport in LHD helical and JT-60U tokamak plasmas

Inagaki, Shigeru*; Takenaga, Hidenobu; Ida, Katsumi*; Isayama, Akihiko; Tamura, Naoki*; Takizuka, Tomonori; Shimozuma, Takashi*; Kamada, Yutaka; Kubo, Shin*; Miura, Yukitoshi; et al.

Nuclear Fusion, 46(1), p.133 - 141, 2006/01

 Times Cited Count:53 Percentile:87.2(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Relativistic downshift frequency effects on ECE measurements of electron temperature and density in torus plasmas

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00

no abstracts in English

Journal Articles

Relativistic downshift frequency effects on electron cyclotron emission measurement; Measurements of electron density in tokamak and electron temperature in LHD

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

Proceedings of 13th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, p.89 - 94, 2005/00

no abstracts in English

Journal Articles

Comparison of transient electron heat transport in LHD helical and JT-60U tokamak plasmas

Inagaki, Shigeru*; Takenaga, Hidenobu; Ida, Katsumi*; Isayama, Akihiko; Tamura, Naoki*; Takizuka, Tomonori; Shimozuma, Takashi*; Kamada, Yutaka; Kubo, Shin*; Miura, Yukitoshi; et al.

Proceedings of 20th IAEA Fusion Energy Conference (FEC 2004) (CD-ROM), 8 Pages, 2004/11

no abstracts in English

Journal Articles

Effects of relativistic frequency downshift on measurements of electron cyclotron emission in Large Helical Device plasma

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

Review of Scientific Instruments, 75(10), p.3819 - 3821, 2004/10

 Times Cited Count:0 Percentile:0.01(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of alumina ceramics vacuum duct for the 3GeV-RCS of the J-PARC project

Kinsho, Michikazu; Saito, Yoshio*; Kabeya, Zenzaburo*; Tajiri, Keisuke*; Nakamura, Tomaru*; Abe, Kazuhiko*; Nagayama, Taketoshi*; Nishizawa, Daiji*; Ogiwara, Norio

Vacuum, 73(2), p.187 - 193, 2004/03

 Times Cited Count:17 Percentile:56.5(Materials Science, Multidisciplinary)

Alimina ceramics vacuum duct has been developing at JAERI for the 3GeV-RCS of the J-PARC project. There are two type of the alumina ceramics vacuum ducts, one is a 1.5m-long duct with a circular cross section for use in the quadrupole magnet, the other is a 3.5m-long being bending 15 degree with an elliptical cross section for use in the dipole magnet.These ducts could be manufactured by brazed jointing several duct segments of 0.5-0.8 m long. Since some electrically conductive boundary is necessary to form on the ceramics duct in order to reduce the duct impedance, the alumina ceramics ducts have copper stripes on the outside surface of the ducts. This is called for rf shielding system. The copper stripes as rf shielding is produced by an electroforming method. In order to reduce emitting secondary electrons when primary protons or electrons impinge onto the surface, TiN film is coated inside surface of the alumina ceramics duct.

Journal Articles

A Report on the 12th topical conference on high temperature plasma diagnostics

Kodama, Ryosuke*; Yoshida, Hidetoshi; *; Nishitani, Takeo; Muto, Sadatsugu*; *; Matsuda, Toshiaki; *; Kawahata, Kazuo*; Isobe, Mitsutaka*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 74(10), p.1208 - 1213, 1998/10

no abstracts in English

Oral presentation

Relativistic downshift frequency effects on ECE measurements of electron temperature and density in LHD and tokamak plasmas

Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*

no journal, , 

no abstracts in English

Oral presentation

Integration of receiving circuit for millimeter-wave imaging device

Kudo, Kosei*; Kogi, Yuichiro*; Ignatenko, M.*; Ito, Naoki*; Mase, Atsushi*; Nagayama, Yoshio*; Yamaguchi, Soichiro*; Kawahata, Kazuo*; Sakata, Eiji*; Oyama, Naoyuki

no journal, , 

no abstracts in English

Oral presentation

Development of heterodyne reception system using band pass filter array

Sakoda, Takuya*; Kogi, Yuichiro*; Mase, Atsushi*; Ito, Naoki*; Nagayama, Yoshio*; Yamaguchi, Soichiro*; Kawahata, Kazuo*; Sakata, Eiji*; Oyama, Naoyuki

no journal, , 

no abstracts in English

Oral presentation

Application of Atomic Energy Grid InfraStructure (AEGIS) to nuclear fusion research

Suzuki, Yoshio; Kushida, Noriyuki; Yamagishi, Nobuhiro; Nakajima, Kohei; Minami, Takahiro; Matsumoto, Nobuko; Aoyagi, Tetsuo; Nakajima, Norihiro; Iba, Katsuyuki*; Hayashi, Nobuhiko; et al.

no journal, , 

no abstracts in English

Oral presentation

Current status of the HIBMC, providing particle beam radiation therapy for more than 2,600 patients, and the prospects of laser-driven proton radiotherapy

Murakami, Masao*; Demizu, Yusuke*; Niwa, Yasue*; Nagayama, Shinichi*; Maeda, Takuya*; Baba, Masashi*; Miyawaki, Daisuke*; Terashima, Kazuki*; Arimura, Takeshi*; Mima, Masayuki*; et al.

no journal, , 

Oral presentation

Development on the inorganic porous materials to sorb platinoid elements

Amamoto, Ippei; Kobayashi, Hidekazu; Ayame, Yasuo; Utsumi, Kazuo*; Takeshita, Kenji*; Onoe, Jun*; Nagayama, Sachiko*; Hasegawa, Yoshio*

no journal, , 

no abstracts in English

Oral presentation

Development of recovery process of platinum-group metals from HLLW for stable production and volume reduction of homogeneous vitrified object, 3; Synthesis of ceramics support materials and their sorption characteristics

Amamoto, Ippei; Kobayashi, Hidekazu; Ayame, Yasuo; Utsumi, Kazuo*; Takeshita, Kenji*; Onoe, Jun*; Nagayama, Sachiko*; Hasegawa, Yoshio*

no journal, , 

no abstracts in English

Oral presentation

Development of recovery process of platinum-group metals from HLLW for stable production and volume reduction of homogeneous vitrified object, 8; Synthesis of ceramics support materials using some of the third period elements (Al and Si) and their sorption characteristics

Kobayashi, Hidekazu; Ayame, Yasuo; Ishidera, Takamitsu; Utsumi, Kazuo*; Takeshita, Kenji*; Onoe, Jun*; Nagayama, Sachiko*; Hasegawa, Yoshio*; Amamoto, Ippei

no journal, , 

no abstracts in English

20 (Records 1-20 displayed on this page)
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