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Journal Articles

Characterization of coherent magnetic fluctuations in JFT-2M high recycling steady high-confinement mode plasmas

Kamiya, Kensaku; Oyama, Naoyuki; Ido, Takeshi*; Bakhtiari, M.*; JFT-2M Group

Physics of Plasmas, 13(3), p.032507_1 - 032507_9, 2006/03

 Times Cited Count:11 Percentile:39.31(Physics, Fluids & Plasmas)

Accompanying the HRS H-mode transition, the coherent magnetic fluctuations in the frequency range of the order of 10-100 kHz with significant variation are seen on the magnetic probes at the vessel wall. Above all, two types of edge MHD activities, which have associated toroidal mode number of n=1 and n$$sim$$7, respectively, seem to be more important for the HRS H-mode plasmas. To investigate their interaction, bi-spectral analysis is applied for the magnetic probe data. It is found to be a powerful tool, exhibiting the phase-coupled oscillations between two types of edge MHD activities having n=1 and n$$sim$$7.

Journal Articles

Reduced divertor heat loads, plasma shape effects, and radial electric field structures in JFT-2M HRS H-mode plasmas

Kamiya, Kensaku; Kawashima, Hisato; Ido, Takeshi*; Oyama, Naoyuki; Bakhtiari, M.*; Kasai, Satoshi; Kusama, Yoshinori; Miura, Yukitoshi; Ogawa, Hiroaki; Tsuzuki, Kazuhiro; et al.

Nuclear Fusion, 46(2), p.272 - 276, 2006/02

 Times Cited Count:3 Percentile:11.73(Physics, Fluids & Plasmas)

An attractive operational regime without any large ELMs, namely High Recycling Steady (HRS) H-mode, was found on JFT-2M during Y2000 campaign after boronization. Recent experiments have concentrated on the studies of the access conditions for the HRS regime, in terms of the pedestal parameters. The HRS regime was more likely at higher edge density and lower edge temperature, which corresponds to the normalized electron collisionality of 1 in the plasma edge region.

Journal Articles

Observation of high recycling steady H-mode edge and compatibility with improved core confinement mode on JFT-2M

Kamiya, Kensaku; Kimura, Haruyuki; Ogawa, Hiroaki; Kawashima, Hisato; Tsuzuki, Kazuhiro; Sato, Masayasu; Miura, Yukitoshi; JFT-2M Group

Nuclear Fusion, 43(10), p.1214 - 1219, 2003/10

 Times Cited Count:34 Percentile:72.26(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Analyses of erosion and re-deposition layers on graphite tiles used in the W-shaped divertor region of JT-60U

Goto, Yoshitaka*; Yagyu, Junichi; Masaki, Kei; Kizu, Kaname; Kaminaga, Atsushi; Kodama, Kozo; Arai, Takashi; Tanabe, Tetsuo*; Miya, Naoyuki

Journal of Nuclear Materials, 313-316, p.370 - 376, 2003/03

 Times Cited Count:45 Percentile:93.67(Materials Science, Multidisciplinary)

Erosion and re-deposition were studied for graphite tiles from W-shaped divertor region of JT-60U in Jun. 1997 - Oct. 1998 periods in which more than 3000 D-D discharges were made with all-carbon wall with boronizations and inner-private flux pumping. On the outer divertor targets, erosion was dominant: maximum erosion depth of around 20 micrometers was measured, while on the inner targets, re-deposition was dominant: columnar structure layers and laminar/columnar-layered structures of maximum thickness around 60 micrometers were found. Through XPS analysis, compositions of the re-deposition layers at a around mid point on the inner target were 94 - 95 at% C, 3 - 4 at% B, and less than 0.6 at% O, Fe, Cr, and Ni. Boron is mainly bound to Carbon. No continuous deposition layers on the dome top/outer wing, while deposition layers were found on the inner wing. Observed in/out asymmetry is attributable to in/out asymmetry of plasma particle conditions in the divertor region.

Journal Articles

Dynamics of plasma during the formation of a weak negative central magnetic shear configuration using counter neutral beam injection in the JFT-2M tokamak

Kamiya, Kensaku; Kimura, Haruyuki; Ogawa, Hiroaki; Kawashima, Hisato; Tsuzuki, Kazuhiro; Isei, Nobuaki; Sato, Masayasu; Shinohara, Koji

Purazuma, Kaku Yugo Gakkai-Shi, 78(12), p.1361 - 1367, 2002/12

no abstracts in English

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

Wall conditioning to reduce impurity and control particle recycling in JT-60U

Higashijima, Satoru; JT-60 Team

Purazuma, Kaku Yugo Gakkai-Shi, 75(11), p.1297 - 1304, 1999/00

no abstracts in English

Journal Articles

Properties of thin boron coatings formed during deuterated-boronization in JT-60

Yagyu, Junichi; Ogiwara, Norio; Saido, Masahiro; Okabe, Tomokazu; Hiratsuka, Hajime; Miyo, Yasuhiko; Naramoto, Hiroshi; Yamamoto, Shunya; Takeshita, Hidefumi; Aoki, Yasushi; et al.

Journal of Nuclear Materials, 241-243, p.579 - 584, 1997/00

 Times Cited Count:15 Percentile:75.44(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Advances in JT-60U facilities and its operation

Kimura, Toyoaki; JT-60 Team

16th IEEE/NPSS Symp. on Fusion Engineering (SOFE '95), 1, p.724 - 729, 1996/00

no abstracts in English

Journal Articles

Impurity and particle recycling reduction by boronization in JT-60U

Higashijima, Satoru*; Sugie, Tatsuo; Kubo, Hirotaka; Tsuji, Shunji; Shimada, Michiya; Asakura, Nobuyuki; Hosogane, Nobuyuki; Kawano, Yasunori; Nakamura, Hiroo; Itami, Kiyoshi; et al.

Journal of Nuclear Materials, 220-222, p.375 - 379, 1995/00

 Times Cited Count:32 Percentile:93.37(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Studies of plasma facing materials in JT-60

Saido, Masahiro

Purazuma, Kaku Yugo Gakkai-Shi, 71(5), p.372 - 378, 1995/00

no abstracts in English

Journal Articles

Wall temperature dependence of boronization using decaborane and diborane

*; *; Saido, Masahiro; Ogiwara, Norio; *

Japanese Journal of Applied Physics, 32(9A), p.3968 - 3974, 1993/09

 Times Cited Count:14 Percentile:61.6(Physics, Applied)

no abstracts in English

Journal Articles

Status of machine and operation of JT-60U

; JT-60 Team

15th IEEE/NPSS Symp. on Fusion Engineering,Vol. 2, 0, p.826 - 829, 1993/00

no abstracts in English

Journal Articles

A Boronization system in the JT-60U tokamak; Application of a new method using a less hazardous substance

Saido, Masahiro; Hiratsuka, Hajime; Arai, Takashi; Neyatani, Yuzuru; Shimada, Michiya;

Fusion Engineering and Design, 22, p.271 - 275, 1993/00

 Times Cited Count:31 Percentile:96.57(Nuclear Science & Technology)

no abstracts in English

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