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Journal Articles

Steady state operation research in JT-60U with extended pulse length

Fujita, Takaaki; JT-60 Team

Nuclear Fusion, 46(3), p.S3 - S12, 2006/03

 Times Cited Count:7 Percentile:72.7(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Development of completely Solenoidless tokamak operation in JT-60U

Ushigome, Masahiro*; Ide, Shunsuke; Ito, Satoshi*; Jotaki, Eriko*; Mitarai, Osamu*; Shiraiwa, Shunichi*; Suzuki, Takahiro; Takase, Yuichi*; Tanaka, Shigetoshi*; Fujita, Takaaki; et al.

Nuclear Fusion, 46(2), p.207 - 213, 2006/02

 Times Cited Count:11 Percentile:59.41(Physics, Fluids & Plasmas)

This papaer studies on tokamak plasma start-up completely without central solenoid (CS). On the JT-60 tokamak it is demonstrated that a completely CS-less Ip start-up to 100 kA was achieved even without any null-point by Electron cyclotron range of frequencies (ECRF) and outer PF coil current swing only. Necessary conditions (the EC power, the toroidal field etc.) were clarified. Moreover, it was succeded to maintain Ip = 260kA for 1 sec without CS by NB only. In addition Ip ramp-up by EC and NB only (without LHCD) from 215 to 310kA was achieved. In a high confinement reversed shear discharge, a result suggesting bootstrap over drive was obtained.

Journal Articles

Enhanced performance and control issues in JT-60U long pulse discharges

Sakamoto, Yoshiteru; JT-60 Team

Plasma Physics and Controlled Fusion, 47(12B), p.B337 - B348, 2005/12

 Times Cited Count:3 Percentile:88.33(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Stationary high confinement plasmas with large bootstrap current fraction in JT-60U

Sakamoto, Yoshiteru; Fujita, Takaaki; Ide, Shunsuke; Isayama, Akihiko; Takechi, Manabu; Suzuki, Takahiro; Takenaga, Hidenobu; Oyama, Naoyuki; Kamada, Yutaka; JT-60 Team

Nuclear Fusion, 45(7), p.574 - 580, 2005/07

 Times Cited Count:36 Percentile:22.95(Physics, Fluids & Plasmas)

This paper reports results on the progress in stationary discharges with a large bootstrap current fraction in JT-60U towards steady-state tokamak operation. In weak shear plasma regime, high-_p ELMy H-mode discharges have been optimized under nearly full non-inductive current drive by the large bootstrap current fraction (fBS$$sim$$50%) and the beam driven current fraction (fBD$$>$$40%), which was sustained for $$sim$$2.3s with stationary condition. The high confinement enhancement factor H89$$sim$$2.3 (HH98y2$$sim$$1.0) was also sustained under the condition of Te$$sim$$Ti. In reversed shear plasma regime, the large bootstrap current fraction (fBS$$sim$$75%) has been sustained for 7.4 s under nearly full non-inductive current drive condition. The high confinement enhancement factor H89$$sim$$3.0 (HH98y2$$sim$$1.7) was also sustained, and the profiles of current and pressure approached the stationary condition. The large bootstrap current and the off-axis beam driven current sustained this reversed q-profile. This duration was limited only by the duration of the neutral beam injection.

Journal Articles

Measurement of local electrical conductivity and thermodynamical coefficients in JT-60U

Kikuchi, Mitsuru; Suzuki, Takahiro; Sakamoto, Yoshiteru; Fujita, Takaaki; Naito, Osamu; JT-60 Team

Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00

Until 1995, it is experimentally confirmed that parallel transport of tokamak follows prediction of neoclassical theory (Kikuchi, Azumi, PPCF review). But it relies on gloval parameter. Since then, local measurement of bootstrap current density or electrical conductivity becomes possible by the development of new plasma diagnostics technique. In this paper, method of comparison of current profile evaluation and its application to electrical conductivity and bootstrap current density is reported.

Journal Articles

High-beta steady-state research and future directions on the Japan Atomic Energy Research Institute Tokamak-60 Upgrade and the Japan Atomic Energy Research Institute Fusion Torus-2 Modified

Ishida, Shinichi; JT-60 Team; JFT-2M Group

Physics of Plasmas, 11(5), p.2532 - 2542, 2004/05

 Times Cited Count:21 Percentile:41.31(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Direct evaluation of spatio-temporal change in current density profile applied to a discharge with neo-classical tearing mode

Suzuki, Takahiro; Oikawa, Toshihiro; Isayama, Akihiko; Fujita, Takaaki

Purazuma, Kaku Yugo Gakkai-Shi, 80(5), p.362 - 363, 2004/05

An analytical method to evaluate spatio-temporal change in current density profile directly from the motional Stark effect (MSE) diagnostic is applied to a discharge, where a neo-classical tearing mode (NTM) appeared and was stabilized by electron cyclotron current drive (ECCD). The analysis clearly shows spatially localized decrease in current density at the magnetic island location, implying decrease in bootstrap current due to flattening of pressure profile within the island. When the NTM is stabilized after the start of the ECCD application, increase in current density at the island location is observed.

Journal Articles

Results and future plan of JT-60U towards steady-state tokamak reactor

Sakurai, Shinji; JT-60 Team

Plasma Science and Technology, 6(1), p.2151 - 2158, 2004/02

 Times Cited Count:0 Percentile:100(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Formation of advanced tokamak plasmas without the use of an ohmic-heating solenoid

Shiraiwa, Shunichi*; Ide, Shunsuke; Ito, Satoshi*; Mitarai, Osamu*; Naito, Osamu; Ozeki, Takahisa; Sakamoto, Yoshiteru; Suzuki, Takahiro; Takase, Yuichi*; Tanaka, Shigetoshi*; et al.

Physical Review Letters, 92(3), p.035001_1 - 035001_4, 2004/01

 Times Cited Count:42 Percentile:16.85(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

TSC simulation of ITB crash and following disruption dynamics on JT-60U high-$$beta$$ reversed shear plasmas

Takei, Nahoko; Nakamura, Yukiharu; Kawano, Yasunori; Tsutsui, Hiroaki*; Ozeki, Takahisa; Tobita, Kenji; Sugihara, Masayoshi; Iio, Shunji*; Shimada, Ryuichi*; Jardin, S. C.*

Europhysics Conference Abstracts, 28G, 4 Pages, 2004/00

no abstracts in English

Journal Articles

Axisymmetric MHD simulation of ITB crash and following disruption dynamics of tokamak plasmas with high bootstrap current

Takei, Nahoko; Nakamura, Yukiharu; Kawano, Yasunori; Tsutsui, Hiroaki*; Ozeki, Takahisa; Tobita, Kenji; Sugihara, Masayoshi; Iio, Shunji*; Shimada, Ryuichi*; Jardin, S. C.*

Journal of Plasma and Fusion Research SERIES, Vol.6, p.554 - 557, 2004/00

no abstracts in English

Journal Articles

Current profile behavior during ramping-up phase in high bootstrap current tokamak plasmas

Nakamura, Yukiharu; Tsutsui, Hiroaki*; Takei, Nahoko*; Shirai, Hiroshi; Sugihara, Masayoshi; Gribov, Y.*; Ozeki, Takahisa; Tobita, Kenji; Iio, Shunji*; Jardin, S. C.*

Journal of Plasma and Fusion Research SERIES, Vol.6, p.196 - 198, 2004/00

no abstracts in English

Journal Articles

Objectives and design of the JT-60 superconducting tokamak

Ishida, Shinichi; Abe, Katsunori*; Ando, Akira*; Chujo, T.*; Fujii, Tsuneyuki; Fujita, Takaaki; Goto, Seiichi*; Hanada, Kazuaki*; Hatayama, Akiyoshi*; Hino, Tomoaki*; et al.

Nuclear Fusion, 43(7), p.606 - 613, 2003/07

no abstracts in English

Journal Articles

TSC modelling of current ramp scenarios with ITB-Generated bootstrap currents in JT-60U reversed shear discharges

Nakamura, Yukiharu; Tsutsui, Hiroaki*; Takei, Nahoko*; Sakamoto, Yoshiteru; Fujita, Takaaki; Sugihara, Masayoshi; Ozeki, Takahisa; Tobita, Kenji; Konishi, Satoshi; Iio, Shunji*; et al.

Europhysics Conference Abstracts, 27A, 4 Pages, 2003/00

no abstracts in English

Journal Articles

Recent progress in tokamak physics toward ITER

Kishimoto, Hiroshi; Shirai, Hiroshi

Proceedings of 3rd International Sakharov Conference on Physics, p.185 - 200, 2003/00

no abstracts in English

Journal Articles

Development of high-performance discharges with transport barriers in JT-60U

Fukuda, Takeshi; JT-60 Team

Plasma Physics and Controlled Fusion, 44(12B), p.B39 - B52, 2002/12

 Times Cited Count:7 Percentile:73.78(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Spatial structure of internal and edge transport barriers

Fujita, Takaaki

Plasma Physics and Controlled Fusion, 44(5A), p.A19 - A35, 2002/05

 Times Cited Count:22 Percentile:39.78(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Sustainment of high confinement in JT-60U reversed shear plasmas

Fujita, Takaaki; Kamada, Yutaka; Ide, Shunsuke; Takeji, Satoru; Sakamoto, Yoshiteru; Isayama, Akihiko; Suzuki, Takahiro; Oikawa, Toshihiro; Fukuda, Takeshi; JT-60 Team

Nuclear Fusion, 42(2), p.180 - 186, 2002/02

 Times Cited Count:25 Percentile:35.55(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Stable existence of central current hole in the JT-60U tokamak

Miura, Yukitoshi; Fujita, Takaaki; Oikawa, Toshihiro; Suzuki, Takahiro; Ide, Shunsuke; Sakamoto, Yoshiteru; Koide, Yoshihiko; Hatae, Takaki; Naito, Osamu; Isayama, Akihiko; et al.

IAEA-CN-94/EX/C3-1Ra (CD-ROM), 5 Pages, 2002/00

no abstracts in English

Journal Articles

Formation and sustainment of current hole in JT-60U

Fujita, Takaaki; Miura, Yukitoshi; Suzuki, Takahiro; Ide, Shunsuke; Takenaga, Hidenobu; Oikawa, Toshihiro; Chankin, A. V.; Sakamoto, Yoshiteru; Koide, Yoshihiko; Hatae, Takaki; et al.

Proceedings of 29th European Physical Society Conference on Plasma Physics and Controlled Fusion, 9 Pages, 2002/00

no abstracts in English

30 (Records 1-20 displayed on this page)