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Journal Articles

Wall conditioning and experience of the carbon-based first wall in JT-60U

Masaki, Kei; Yagyu, Junichi; Arai, Takashi; Kaminaga, Atsushi; Kodama, Kozo; Miya, Naoyuki; Ando, Toshiro; Hiratsuka, Hajime; Saido, Masahiro

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.386 - 395, 2002/09

 Times Cited Count:8 Percentile:49.76(Nuclear Science & Technology)

The wall conditioning of JT-60U consists of the 300$$^{circ}$$C baking, He-TDC, He-GDC, tokamak discharge cleaning and boronization. Using these methods, total pressure of the vacuum vessel reached finally 10$$^{-6}$$ $$sim$$ 10$$^{-5}$$ Pa. The oxygen impurity was decreased to $$sim$$0.5%. The experience with the carbon-based first wall showed that taper shaping is effective to reduce the local heat concentration to the tile edges. The observed poloidal asymmetric deposition of carbon on the divertor region implies that the carbon impurity produced in the outer divertor contributes to the deposition on the inner divertor. In 1992 and 1993, the B$$_{4}$$C converted CFC tiles were installed in the outer divertor to reduce chemical sputtering of CFC tiles and oxygen impurity. The reduction was successfully demonstrated with the B$$_{4}$$C converted CFC tiles. In order to understand the tritium behavior in JT-60U, tritium in the first wall and the exhaust gas were measured. The estimated tritium inventory in the first wall was $$sim$$50% of the generated tritium.

Journal Articles

Characterization of disruption phenomenology in ITER

Yoshino, Ryuji; D.J.Campbell*; E.Fredrickson*; Fujisawa, Noboru; N.Granetz*; Gruber, O.*; T.C.Hender*; D.A.Humphreys*; N.Ivanov*; S.Jardin*; et al.

Fusion Energy 2000 (CD-ROM), 4 Pages, 2001/05

no abstracts in English

Journal Articles

Burn control in tokamak fusion reactors; Disruption and fast plasma shutdown

Yoshino, Ryuji

Purazuma, Kaku Yugo Gakkai-Shi, 75(12), p.1337 - 1374, 1999/12

no abstracts in English

Journal Articles

Characteristics of halo current in JT-60U

Neyatani, Yuzuru; Nakamura, Yukiharu; Yoshino, Ryuji; Hatae, Takaki; JT-60 Team

Fusion Energy 1998, p.859 - 862, 1998/10

no abstracts in English

Journal Articles

Electromagnetic analysis in the tokamak fusion reactor and large helical device

Koizumi, Koichi; Yamazaki, Kozo*

Purazuma, Kaku Yugo Gakkai-Shi, 72(12), p.1352 - 1361, 1996/12

no abstracts in English

Journal Articles

VDE characteristics during disruption process and its underlying acceleration mechanism in the ITER-EDA tokamak

Nakamura, Yukiharu; Nishio, Satoshi; Yoshino, Ryuji; C.E.Kessel*; S.C.Jardin*

Purazuma, Kaku Yugo Gakkai-Shi, 72(12), p.1387 - 1396, 1996/12

no abstracts in English

Journal Articles

Acceleration mechanism of vertical displacement event and its amelioration in tokamak disruptions

Nakamura, Yukiharu; Yoshino, Ryuji; N.Pomphrey*; S.C.Jardin*

Journal of Nuclear Science and Technology, 33(8), p.609 - 619, 1996/08

 Times Cited Count:5 Percentile:40.53(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Avoidance of VDEs during plasma current quench in JT-60U

Yoshino, Ryuji; Nakamura, Yukiharu; Neyatani, Yuzuru

Nuclear Fusion, 36(3), p.295 - 307, 1996/00

 Times Cited Count:33 Percentile:72.62(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Electromagnetic design aspects of fusion device

Nishio, Satoshi

Purazuma, Kaku Yugo Gakkai-Shi, 72(10), p.1052 - 1060, 1996/00

no abstracts in English

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