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Kamada, Yutaka; Oyama, Naoyuki; Ide, Shunsuke; Sakamoto, Yoshiteru; Isayama, Akihiko; Fujita, Takaaki; Urano, Hajime; Suzuki, Takahiro; Yoshida, Maiko
Plasma Physics and Controlled Fusion, 48(5A), p.A419 - A427, 2006/05
Times Cited Count：16 Percentile：48.35(Physics, Fluids & Plasmas)no abstracts in English
Sakamoto, Yoshiteru; Toi, Kazuo*; Fukuda, Takeshi*; Fukuyama, Atsushi*; Fujita, Takaaki; Ogawa, Yuichi*; Takizuka, Tomonori; Takenaga, Hidenobu; Yagi, Masatoshi*; Yamada, Hiroshi*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 81(8), p.626 - 627, 2005/08
no abstracts in English
Urano, Hajime; Kamada, Yutaka; Takizuka, Tomonori; Suttrop, W.*; Horton, L.*; Lang, P.*; Kubo, Hirotaka; Oyama, Naoyuki; Takenaga, Hidenobu; Asakura, Nobuyuki
Purazuma, Kaku Yugo Gakkai-Shi, 81(4), p.280 - 287, 2005/04
Role of the pedestal structure in ELMy H-mode plasmas for the core energy confinement and for the ELM energy losses have been investigated in JT-60U and ASDEX Upgrade. The confinement degradation seen at higher densities is attributed to the reduction of the pedestal temperature limited by the ELM activities and the stiffness of the temperature profiles. In high triangularity or impurity seeded H-modes, in which higher energy confinement is generally achieved, higher pedestal temperature is obtained by the improvement of the edge MHD stability or the density profile peaking, respectively. The upper bound of the ELM energy loss is characterised by the pedestal energy. The energy transport in between ELMs enhanced with increasing the pedestal collisionality reduces the ELM loss power fraction. It is also shown in ASDEX Upgrade that the continuous pellet injection is valid for the integrated performance of smaller ELM losses and favourable core confinement.
Kallenbach, A.*; Asakura, Nobuyuki; Kirk, A.*; Korotkov, A.*; Mahdavi, M. A.*; Mossessian, D.*; Porter, G. D.*
Journal of Nuclear Materials, 337-339, p.381 - 385, 2005/03
Times Cited Count：66 Percentile：96.56(Materials Science, Multidisciplinary)Edge profile data for H-mode discharges in 6 tokamaks have been analysed with the main focus on the edge density profile as well as electron temperature and density gradient lengths and steep gradient zone widths. A uniform procedure of data treatment and assignment of the separatrix position via power balance allowed to put the multi-machine data on an even base. The machine size appears to be the leading parameter for the width of the steep edge transport barrier gradient zone, as well as for the temperature decay length at the separatrix. Effects associated with neutral penetration physics are visible in the edge density profile.
Urano, Hajime
JAERI-Research 2004-027, 131 Pages, 2005/02
JAERI-Research-2004-027.pdf:5.69MB
no abstracts in English
Kawano, Yasunori; Kawahata, Kazuo*; Kusama, Yoshinori; Sasao, Mamiko*; Sugie, Tatsuo; Mase, Atsushi*; Asakura, Nobuyuki; Kato, Takako*; Takamura, Shuichi*; Tanabe, Tetsuo*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 81(2), p.128 - 130, 2005/02
no abstracts in English
Kusama, Yoshinori; Kawahata, Kazuo*; Sasao, Mamiko*; Mase, Atsushi*; Sugie, Tatsuo; Kawano, Yasunori; Oyama, Naoyuki; Kamada, Yutaka; Nakashima, Yosuke*; Ida, Katsumi*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 80(7), P. 643, 2004/07
no abstracts in English
Saibene, G.*; Hatae, Takaki; Campbell, D. J.*; Cordey, J. G.*; la Luna, E. de.*; Giroud, C.*; Guenther, K.*; Kamada, Yutaka; Kempenaars, M. A. H.*; Loarte, A.*; et al.
Plasma Physics and Controlled Fusion, 46(5A), p.A195 - A205, 2004/05
Times Cited Count：10 Percentile：32.04(Physics, Fluids & Plasmas)Towards establishment of the control scheme and evaluation of the H-mode pedestal structure and behavior of the Edge Localized Mode (ELM) in ITER, we carried out an comparison experiment among the two large tokamaks (JT-60 and JET) for the first time. This paper report the initial results. In both devices, the same plasma shape was adopted and the three non-dimensional parameters (beta, normalized gyro radius and the normalized collisionality) were set identical. The pedestal width was almost similar in the two devices, however the pressure gradient was higher in JET by a factor of 1.5. The possible reason is a small aspect ration in JET.
Oyama, Naoyuki; Bruskin, L. G.*; Takenaga, Hidenobu; Shinohara, Koji; Isayama, Akihiko; Ide, Shunsuke; Sakamoto, Yoshiteru; Suzuki, Takahiro; Fujita, Takaaki; Kamada, Yutaka; et al.
Plasma Physics and Controlled Fusion, 46(5A), p.A355 - A361, 2004/05
Times Cited Count：11 Percentile：34.74(Physics, Fluids & Plasmas)no abstracts in English
Takizuka, Tomonori; Ogawa, Yuichi*; Miura, Yukitoshi; Yagi, Masatoshi*; Fujita, Takaaki; Toi, Kazuo*; Fukuda, Takeshi*; Fukuyama, Atsushi*; Ida, Katsumi*; *; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 79(6), p.628 - 629, 2003/06
no abstracts in English
Loarte, A.*; Saibene, G.*; Sartori, R.*; Becoulet, M.*; Horton, L.*; Eich, T.*; Herrmann, A.*; Laux, M.*; Matthews, G.*; Jachmich, S.*; et al.
Journal of Nuclear Materials, 313-316, p.962 - 966, 2003/03
Times Cited Count：115 Percentile：98.43(Materials Science, Multidisciplinary)no abstracts in English
Mikkelsen, D. R.*; Shirai, Hiroshi; Urano, Hajime*; Takizuka, Tomonori; Kamada, Yutaka; Hatae, Takaki; Koide, Yoshihiko; Asakura, Nobuyuki; Fujita, Takaaki; Fukuda, Takeshi*; et al.
Nuclear Fusion, 43(1), p.30 - 39, 2003/01
Times Cited Count：29 Percentile：64.08(Physics, Fluids & Plasmas)The stiffness of thermal transport in ELMy H-modes is explained in a series of carefully chosen JT-60U plasmas, and measured temperature are compared with the predictions of several transport models. A heating power scan with constant Tped, a scan of pedestal temperature Tped with constant heating power, and an on/off-axis heating comparison are presented. Predictions of the RLWB and IFS/PPPL models generally agree with the measured temperature outside 
0.3
, but the Multimode model uniformly predicts temperatures that are too high except in the central region.
Takamura, Shuichi*; Wakatani, Masahiro*; Ninomiya, Hiromasa; Kamada, Yutaka; Yatsu, Kiyoshi*; Hatae, Takaki; Sugihara, Masayoshi; Iio, Shunji*; Ozeki, Takahisa; Kawano, Yasunori
Purazuma, Kaku Yugo Gakkai-Shi, 79(1), P. 70, 2003/01
no abstracts in English
Ninomiya, Hiromasa; Takamura, Shuichi*; Wakatani, Masahiro*; Fujita, Takaaki; Fukuda, Takeshi; Toi, Kazuo*; Ogawa, Yuichi*; Takizuka, Tomonori; Miura, Yukitoshi; Hatae, Takaki; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 78(7), p.692 - 694, 2002/07
The second ITPA (International Tokamak Physics Activity) meeting was held at General Atomics (San Diego) and Princeton Plasma Physics Laboratory (Princeton) in U.S.A. In the meeting, topical physics group meetings of "Coordinating Committee", "Transport and Internal Barrier Physics", "Confinement Database and Modeling", "Edge and Pedestal Physics", "Scrape-off-layer and Divertor Physics", and "Diagnostics" were carried out. In getting many participants from Japan, Europe, Russia, ITER international team and U.S.A., the active discussions were carried out. On the other hand, the topical group members concerned that the contribution from Japan will be decreased if the experimental period of JT-60U is reduced. Here, the outline of discussions in each topical group is reported.
ELMy H-mode regime in JT-60UKamada, Yutaka; Takenaga, Hidenobu; Isayama, Akihiko; Hatae, Takaki; Urano, Hajime*; Kubo, Hirotaka; Takizuka, Tomonori; Miura, Yukitoshi
Plasma Physics and Controlled Fusion, 44(5A), p.A279 - A286, 2002/05
Times Cited Count：77 Percentile：89.73(Physics, Fluids & Plasmas)no abstracts in English
Fujita, Takaaki
Plasma Physics and Controlled Fusion, 44(5A), p.A19 - A35, 2002/05
Times Cited Count：28 Percentile：63.95(Physics, Fluids & Plasmas)no abstracts in English
Urano, Hajime*; Kamada, Yutaka; Shirai, Hiroshi; Takizuka, Tomonori; Kubo, Hirotaka; Takenaga, Hidenobu; Miura, Yukitoshi; Hatae, Takaki; Fukuda, Takeshi
Plasma Physics and Controlled Fusion, 44(5A), p.A437 - A443, 2002/05
Times Cited Count：18 Percentile：50.83(Physics, Fluids & Plasmas)no abstracts in English
Urano, Hajime; Kamada, Yutaka; Shirai, Hiroshi; Takizuka, Tomonori; Ide, Shunsuke; Fujita, Takaaki; Fukuda, Takeshi
Nuclear Fusion, 42(1), p.76 - 85, 2002/01
Times Cited Count：33 Percentile：69.82(Physics, Fluids & Plasmas)no abstracts in English
Urano, Hajime*; Kamada, Yutaka; Shirai, Hiroshi; Takizuka, Tomonori; Kubo, Hirotaka; Hatae, Takaki; Fukuda, Takeshi
Plasma Physics and Controlled Fusion, 44(1), p.11 - 21, 2002/01
Times Cited Count：23 Percentile：58.59(Physics, Fluids & Plasmas)no abstracts in English
Ogawa, Yuichi*; Takizuka, Tomonori; Miura, Yukitoshi; Toi, Kazuo*; Fukuda, Takeshi; Wakatani, Masahiro*; Ide, Shunsuke; Takase, Yuichi*; Tobita, Kenji; Fukuyama, Atsushi*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 77(10), p.1042 - 1048, 2001/10
no abstracts in English
