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Journal Articles

28th report on the ITPA (International Tokamak Physics Activity) meeting

Asakura, Nobuyuki; Nakano, Tomohide; Masuzaki, Takashi*; Ashikawa, Naoko*; Ueda, Yoshio*; Tanabe, Tetsuo*; Ono, Noriyasu*

Purazuma, Kaku Yugo Gakkai-Shi, 86(2), P. 124, 2010/02

no abstracts in English

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:73.8(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.

Oral presentation

Comparison of boronized wall between LHD and JT-60U for optimization of boronization procedure

Ashikawa, Naoko*; Nishimura, Kiyohiko*; Masuzaki, Takashi*; Sagara, Akio*; Oyabu, Nobuyoshi*; Kizu, Kaname; Yagyu, Junichi; Nobuta, Yuji; Ishimoto, Yuki*; Miya, Naoyuki; et al.

no journal, , 

no abstracts in English

Oral presentation

Waste management scenario in hot cell for DEMO

Someya, Yoji; Tobita, Kenji; Kondo, Masatoshi*; Ueno, Kenichi; Yanagihara, Satoshi*; Matsuda, Shinzaburo*; Hatano, Yuji*; Masuzaki, Suguru*; Kato, Takashi*; Uto, Hiroyasu; et al.

no journal, , 

In the replacement period of a fusion power reactor, blanket and divertor modules should be removed from the reactor as an assembly for plant availability. It is assumed that the sector assembly is changed over at every two years during the operation. In the hot cell, the modules will be removed from the back plate of the assembly. Since the back plate made of F82H can be reused, the decay heat must be removed using active cooling to keep the temperature below 550 $$^{circ}$$C for structural strength of F82H. At the same time, the active cooling must not cause a contamination of the hot cell environment due to dispersion of tritium and tungsten dust. The cooling scenario is one of key points in the waste management. The problem is the space for storage. Breaking up the F82H into small pieces reduces the volume of the waste, contributing to a reduction of the storage space.

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