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Ito, Kimitaka*; Ito, Sanae*; Kamiya, Kensaku; Kasuya, Naohiro*
Plasma Physics and Controlled Fusion, 57(7), p.075008_1 - 075008_7, 2015/07
Times Cited Count：19 Percentile：68.71(Physics, Fluids & Plasmas)The solitary radial electric field in the edge of toroidal plasma is studied based on the electric field bifurcation model. Results are applied to tokamak and helical plasmas, and the dependence of the electric field structure on the plasma parameters and geometrical factors is analyzed. The order of magnitude estimate for tokamak plasma is not far from experimental observations. It is shown that, in helical plasmas, the height of electric field structure is reduced substantially owing to the ripple particle transport, while the width is influenced less. The implications of the results for the limit of achievable gradient in the H-mode pedestal are also discussed.
Sakamoto, Yoshiteru; Suzuki, Takahiro; Ide, Shunsuke; Koide, Yoshihiko; Takenaga, Hidenobu; Kamada, Yutaka; Fujita, Takaaki; Fukuda, Takeshi; Takizuka, Tomonori; Shirai, Hiroshi; et al.
Nuclear Fusion, 44(8), p.876 - 882, 2004/08
Times Cited Count：34 Percentile：71.1(Physics, Fluids & Plasmas)Response of the ion thermal diffusivity to the radial electric field Er shear has been investigated in JT-60U and the following results were found. (1) In the case of positive magnetic shear (PS) plasma, the ion thermal diffusivity in the core region shows L mode state, weak internal transport barrier (ITB), and strong ITB depending upon the heating power. In the case of reversed magnetic shear (RS) plasma, however, no power degradation of the ion thermal diffusivity is observed. (2) In the case of weak ITB, the ion thermal diffusivity decreases gradually with increasing the Er shear for both PS and RS plasmas. There exists a threshold of an effective Er shear to change its state from weak to strong ITBs. (3) The threshold of the effective Er shear in the case of RS plasma is small compared with that in the case of PS plasma.
Ida, Katsumi*; Fujita, Takaaki; Fukuda, Takeshi*; Sakamoto, Yoshiteru; Ide, Shunsuke; Toi, Kazuo*; Inagaki, Shigeru*; Shimozuma, Takashi*; Kubo, Shin*; Idei, Hiroshi*; et al.
Plasma Physics and Controlled Fusion, 46(5A), p.A45 - A50, 2004/05
Times Cited Count：19 Percentile：53.39(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
Suzuki, Takahiro; Sugie, Tatsuo
Purazuma, Kaku Yugo Gakkai-Shi, 78(5), p.411 - 416, 2002/05
no abstracts in English
Rewoldt, G.*; Hill, K. W.*; Nazikian, R. M.*; Tang, W. M.*; Shirai, Hiroshi; Sakamoto, Yoshiteru; Kishimoto, Yasuaki; Ide, Shunsuke; Fujita, Takaaki
Nuclear Fusion, 42(4), p.403 - 411, 2002/04
Times Cited Count：9 Percentile：30.39(Physics, Fluids & Plasmas)One class of internal transport barrier discharge in the JT-60U tokamak is characterized by two relatively flat regions of the pressure separated by a region with very large pressure gradient. Linear growth rates for toroidal drift type modes are calculated for discharges in this class, without and with sheared 
rotation effects. For cases with fully developed barriers, the results with rotation are consistent with a picture in which the radial electric field generated in part by the steep pressure gradient causes local stabilization, and thus reduction of the local anomalous transport, which allows the steep pressure gradient to persist. If rotation is omitted from the calculation for these cases, or if rotation is included for cases without barriers or with partially developed barriers, the unstable region spreads into the steep pressure gradient region.
Matsumoto, Taro; Tokuda, Shinji; Kishimoto, Yasuaki; Naito, Hiroshi*
Earth Planets and Space, 53(6), p.565 - 570, 2001/06
Times Cited Count：0 Percentile：0.01(Geosciences, Multidisciplinary)no abstracts in English
Matsumoto, Taro; Tokuda, Shinji; Kishimoto, Yasuaki; Naito, Hiroshi*
Earth Planets and Space, 53(6), p.565 - 570, 2001/00
no abstracts in English
Sakamoto, Yoshiteru; Takizuka, Tomonori; Shirai, Hiroshi; Fujita, Takaaki; Kamada, Yutaka; Ide, Shunsuke; Fukuda, Takeshi; Koide, Yoshihiko
Journal of Plasma and Fusion Research SERIES, Vol.4, p.249 - 252, 2001/00
no abstracts in English
Takizuka, Tomonori; Hosokawa, Masanari*
Contributions to Plasma Physics, 40(3-4), p.471 - 477, 2000/11
Times Cited Count：19 Percentile：51.35(Physics, Fluids & Plasmas)no abstracts in English
Shirai, Hiroshi; Kikuchi, Mitsuru; Takizuka, Tomonori; Fujita, Takaaki; Koide, Yoshihiko; Sakamoto, Yoshiteru; Naito, Osamu; Hatae, Takaki; Isayama, Akihiko; Kamada, Yutaka; et al.
Plasma Physics and Controlled Fusion, 42(suppl.5A), p.A109 - A115, 2000/05
Times Cited Count：28 Percentile：64.36(Physics, Fluids & Plasmas)no abstracts in English
Shirai, Hiroshi; Kikuchi, Mitsuru; Takizuka, Tomonori; Azumi, Masafumi
Purazuma, Kaku Yugo Gakkai-Shi, 75(4), p.444 - 451, 1999/04
no abstracts in English
shearing in improved confinement regimes in JT-60UShirai, Hiroshi; Kikuchi, Mitsuru; Takizuka, Tomonori; Fujita, Takaaki; Koide, Yoshihiko; Rewoldt, G.*; Mikkelsen, D. R.*; Budny, R.*; Tang, W. M.*; Kishimoto, Yasuaki; et al.
Fusion Energy 1998, 2, p.405 - 412, 1999/00
no abstracts in English
Shirai, Hiroshi; Kikuchi, Mitsuru; Takizuka, Tomonori; Fujita, Takaaki; Koide, Yoshihiko; Rewoldt, G.*; Mikkelsen, D. R.*; Budny, R.*; Tang, W. M.*; Kishimoto, Yasuaki; et al.
Nuclear Fusion, 39(11Y), p.1713 - 1722, 1999/00
Times Cited Count：68 Percentile：87.07(Physics, Fluids & Plasmas)no abstracts in English
Matsuoka, Mamoru; *
Nuclear Fusion, 33(1), p.161 - 163, 1993/00
Times Cited Count：3 Percentile：22.99(Physics, Fluids & Plasmas)no abstracts in English
Miura, Yukitoshi; Ida, Katsumi; Ito, Kimitaka; Ito, Sanae*
Annual Report of National Institute for Fusion Science; April 1991 - March 1992, P. 85, 1992/11
no abstracts in English
