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Journal Articles

Review of recent steady-state advanced tokamak research and its further pursuit by reduction of TF ripple on JT-60U

Shinohara, Koji; JT-60 Team

Journal of the Korean Physical Society, 49, p.S56 - S62, 2006/12

The recent results of JT-60, such as the long discharge with the high normalized beta of 2.3 and the pulse length of 22.3 s which was 13 times longer than the current profile relaxation, and the observation of the increase of D$$alpha$$ emission and electron density as results of wall saturation will be reviewed. Additionally, the motivation and the design work will be reviewd on an on-going recent project of the ferritic insertion for the reduction of the toroidal field ripple. The pioneering works of JFT-2M in the ferritic insertion will be also reported.

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:8 Percentile:70.09(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Study of global wall saturation mechanisms in long-pulse ELMy H-mode discharges on JT-60U

Takenaga, Hidenobu; Nakano, Tomohide; Asakura, Nobuyuki; Kubo, Hirotaka; Konoshima, Shigeru; Shimizu, Katsuhiro; Tsuzuki, Kazuhiro; Masaki, Kei; Tanabe, Tetsuo*; Ide, Shunsuke; et al.

Nuclear Fusion, 46(3), p.S39 - S48, 2006/03

 Times Cited Count:16 Percentile:44.22(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Study of plasma wall interactions in the long-pulse NB-heated discharges of JT-60U towards steady-state operation

Takenaga, Hidenobu; Asakura, Nobuyuki; Higashijima, Satoru; Nakano, Tomohide; Kubo, Hirotaka; Konoshima, Shigeru; Oyama, Naoyuki; Isayama, Akihiko; Ide, Shunsuke; Fujita, Takaaki; et al.

Journal of Nuclear Materials, 337-339, p.802 - 807, 2005/03

 Times Cited Count:13 Percentile:28.39(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Effects of long time scale variation of plasma wall interactions on particle control in JT-60U

Takenaga, Hidenobu; Nakano, Tomohide; Asakura, Nobuyuki; Kubo, Hirotaka; Konoshima, Shigeru; Shimizu, Katsuhiro; Tsuzuki, Kazuhiro; Ide, Shunsuke; Fujita, Takaaki

Proceedings of 4th IAEA Technical Meeting on Steady-State Operation of Magnetic Fusion Devices and MHD of Advanced Scenarios (Internet), 8 Pages, 2005/02

no abstracts in English

Journal Articles

Wall pumping and saturation in divertor tokamaks

Asakura, Nobuyuki

Plasma Physics and Controlled Fusion, 46(12B), p.B335 - B347, 2004/12

 Times Cited Count:15 Percentile:48.33(Physics, Fluids & Plasmas)

Particle control of the main plasma density and exhaust of impurities ions have been demonstrated using the divertor pumping under saturated divertor condition. In JT-60U, ELMy H-mode operation was recently extended to 30s (with NB heating of 8-14 MW). Total number of injected particles reached (1-4)x1023 to maintain high densities. During the long pulse ELMy H-mode of JT-60U, gas puff rate was decreased from 15 to 3Pam3/s, while pumping rate was relatively constant of ~10 Pam3/s. Thus, the divertor plate was mostly saturated. It was found that 40-50% of the injected D was retained, which are comparable to Tore-Supra long pulse and JET high density ELMy H-mode pulse. Particle balance for long pulse and/or high density plasmas are discussed. Carbon flux generated by the chemical process was increased due to increase in the target temperature. Carbon generation and carbon ion emission were gradually increased in the outer leg of the divertor and the X-point. Shielding effect of the divertor was sustained and increment of the radiation power fraction was small in 30s.

Journal Articles

Recent progress in magnetic measurement

Sakakibara, Satoru*; Kurihara, Kenichi

Purazuma, Kaku Yugo Gakkai-Shi, 80(5), p.364 - 371, 2004/05

This article presents recent progress in magnetic measurements at magnetic confinement systems. The drift-problem of the integrator used in magnetic measurements is one of the major problems for plasma control and estimation of equilibrium parameters in long-pulse operation. In addition, the durability of the sensors such as a magnetic probe, a flux loop, etc., under fusion neutron irradiation environments is also important. The present status of the developments of a long-pulse integrator and a magnetic sensor are reported.

Journal Articles

Long timescale plasma dynamics and explosive growth driven by the double tearing mode in reversed shear plasmas

Ishii, Yasutomo; Azumi, Masafumi; Kishimoto, Yasuaki; Leboeuf, J. N.*

Nuclear Fusion, 43(7), p.539 - 546, 2003/07

no abstracts in English

Journal Articles

Development of a digital integrator with very high input voltage range and very low drift for magnetic measurements for long-pulse tokamak operation

Kawamata, Yoichi; Kurihara, Kenichi; Yonekawa, Izuru

Heisei-13-Nendo Denki Gakkai Genshiryoku Kenkyu Shiryo (NE-01-13), p.25 - 30, 2002/09

no abstracts in English

Journal Articles

Development of an intelligent digital integrator for long-pulse operation in a tokamak

Kawamata, Yoichi; Yonekawa, Izuru; Kurihara, Kenichi

Proceedings of 19th IEEE/NPSS Symposium on Fusion Engineering (SOFE), p.172 - 175, 2002/00

no abstracts in English

Journal Articles

SANS study of slow dynamics in concetrated spin glasses

Motoya, Kiyoichiro*; Hioki, Keiko*; Suzuki, Junichi

Journal of the Physical Society of Japan, 70(Suppl.A), p.139 - 141, 2001/05

no abstracts in English

Journal Articles

Development of a long-time and wide operational range integrator with a VF converter for Magnetic Measurments in JT-60

Kawamata, Yoichi; Kurihara, Kenichi

Heisei-12-Nendo Tohoku Daigaku Gijutsu Kenkyukai Hokoku, p.110 - 112, 2001/03

no abstracts in English

Journal Articles

Infrated laser polarimetry for electron density pleasurement in tokamak plasmas

Kawano, Yasunori; Chiba, Shinichi; Inoue, Akira*

Review of Scientific Instruments, 72(1), p.1068 - 1072, 2001/01

 Times Cited Count:30 Percentile:17.27(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Polarimetry on JT-60U

Kawano, Yasunori

Purazuma, Kaku Yugo Gakkai-Shi, 76(9), p.855 - 859, 2000/09

no abstracts in English

Journal Articles

Electron density measurement for steady state plasmas

Kawano, Yasunori; Chiba, Shinichi; Inoue, Akira*

Journal of Plasma and Fusion Research SERIES, Vol.3, p.397 - 401, 2000/00

no abstracts in English

Journal Articles

High performance experiments in JT-60U reversed shear discharges

Fujita, Takaaki; Kamada, Yutaka; Ishida, Shinichi; Neyatani, Yuzuru; Oikawa, Toshihiro; Ide, Shunsuke; Takeji, Satoru; Koide, Yoshihiko; Isayama, Akihiko; Fukuda, Takeshi; et al.

IAEA-CN-69/EX1/2 (CD-ROM), 8 Pages, 1999/00

no abstracts in English

Journal Articles

Development of a precise long-time digital integrator for magnetic measurements in a tokamak

Kurihara, Kenichi; Kawamata, Yoichi

Fusion Technology 1996, 1, p.795 - 798, 1997/00

no abstracts in English

Journal Articles

Characteristics of alanine dosimeter under low dose-rate and long time irradiation; Residual life estimation of organic materials used in the radiation environment

Haruyama, Yasuyuki; Tachibana, Hiroyuki; Kojima, Takuji; *; Kashiwazaki, Shigeru*; *; *

Radioisotopes, 44(8), p.507 - 513, 1995/08

no abstracts in English

Journal Articles

Development of irradiation capsules using polymers

Arigane, Kenji; *; ; Seguchi, Tadao; Takahashi, Hidetake

Proc. of 4th Asian Symp. on Research Reactors, 10 Pages, 1993/00

no abstracts in English

JAEA Reports

Optimization for steady-state and hybrid operations of ITER by using scaling models of divertor heat load

*; Fujieda, Hirobumi*; Itami, Kiyoshi; Sugihara, Masayoshi

JAERI-M 92-145, 46 Pages, 1992/09

JAERI-M-92-145.pdf:1.32MB

no abstracts in English

31 (Records 1-20 displayed on this page)