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Journal Articles

Simulation of dynamics of carbon dust particles in the JT-60U tokamak

Tanaka, Yasunori*; Smirnov, R. D.*; Pigarov, A. Y.*; Takenaga, Hidenobu; Asakura, Nobuyuki; Uesugi, Yoshihiko*; Ono, Noriyasu*

Journal of Nuclear Materials, 415(Suppl.1), p.S1106 - S1110, 2011/08

 Times Cited Count:7 Percentile:43.84(Materials Science, Multidisciplinary)

Dust can be an important contributor to impurity contamination of the core and scrape-off-layer (SOL) plasmas in tokamak fusion devices. This is the first report about investigation of transport of carbon dust particles in case of JT-60U tokamak using the dust transport code (DUSTT). The DUSTT code takes into account various plasma-dust interaction processes. In the present report, background plasma parameters in JT-60U such as densities and temperatures of electron, ion and neutral atom were computed with the UEDGE code. Three dimensional trajectories, temperature evolution, and radius variation of dust particles launched from different positions at the inner divertor, the outer divertor and the dome structure in JT-60U tokamak were simulated numerically to study dynamics and transport of dust particles there. As a result, the lifetime of dust particles is dependent mainly on the ion density in trajectories in final term.

Journal Articles

Statistical analysis of fluctuation characteristics at high- and low-field sides in L-mode SOL plasmas of JT-60U

Tanaka, Hirohiko*; Ono, Noriyasu*; Asakura, Nobuyuki; Tsuji, Yoshiyuki*; Kawashima, Hisato; Takamura, Shuichi*; Uesugi, Yoshihiko*; JT-60U Team

Nuclear Fusion, 49(6), p.065017_1 - 065017_7, 2009/06

 Times Cited Count:27 Percentile:25.37(Physics, Fluids & Plasmas)

Comparison between fluctuation characteristics at high-field-side (HFS) and low-field-side (LFS) scrape off layers (SOLs) has been made, for the first time, in the L mode plasma of the JT-60U tokamak using reciprocating Langumuir probes. Statistical analysis based on probability distribution function (PDF) was employed to describe intermittent (non-diffusion) transport in SOL plasma fluctuations. The positive bursty events appeared most frequently at LFS midplane associated with blobby plasma transport, then the PDF is strongly skewed positively, while the PDF in HFS SOL is close to Gaussian distribution. Conditional averaging analysis of the positive bursty events at LFS midplane indicates the intermittent feature with a rapid increase and a slow decay is similar to that of plasma blobs theoretically predicted. Statistical self-similarity was also investigated with Fourier power spectrum and statistics of waiting-time and duration-time of the fluctuation.

Journal Articles

ELM propagation and fluctuations characteristics in H- and L-mode SOL plasmas on JT-60U

Asakura, Nobuyuki; Ono, Noriyasu*; Kawashima, Hisato; Miyoshi, Hideaki*; Matsunaga, Go; Oyama, Naoyuki; Takamura, Shuichi*; Uesugi, Yoshihiko*; Takechi, Manabu; Nakano, Tomohide; et al.

Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03

Radial transport of the SOL plasma was recently studied in order to understand heat and particle loading to the first wall and the SOL formation mechanism. Fast propagation of the ELM plasma and fluctuation properties in H- and L-modes were determined at low-field-side (LFS) SOL using reciprocating Mach probes in JT-60U. Large and short peaks were found in ELM plasma flux, which was regularly enhanced after each ELM event. Transport dynamics of the first large ${it j$_{s}$}$ peak was determined, i.e. it propagated to near the first wall with the fast velocity of 1.3-2.5 km/s. Statistical analysis of a probability distribution function was applied to describe intermittent (non-diffusion) transport in SOL plasma fluctuations. It was found that the positive bursty events appeared in a wide SOL region, where the flow reversal of the SOL plasma was observed. Influences of the radial transport of the convective blobby plasma on the SOL formation and the flow reversal were investigated.

Journal Articles

Overview of national centralized tokamak program; Mission, design and strategy to contribute ITER and DEMO

Ninomiya, Hiromasa; Akiba, Masato; Fujii, Tsuneyuki; Fujita, Takaaki; Fujiwara, Masami*; Hamamatsu, Kiyotaka; Hayashi, Nobuhiko; Hosogane, Nobuyuki; Ikeda, Yoshitaka; Inoue, Nobuyuki; et al.

Journal of the Korean Physical Society, 49, p.S428 - S432, 2006/12

To contribute DEMO and ITER, the design to modify the present JT-60U into superconducting coil machine, named National Centralized Tokamak (NCT), is being progressed under nationwide collaborations in Japan. Mission, design and strategy of this NCT program is summarized.

Journal Articles

Overview of the national centralized tokamak programme

Kikuchi, Mitsuru; Tamai, Hiroshi; Matsukawa, Makoto; Fujita, Takaaki; Takase, Yuichi*; Sakurai, Shinji; Kizu, Kaname; Tsuchiya, Katsuhiko; Kurita, Genichi; Morioka, Atsuhiko; et al.

Nuclear Fusion, 46(3), p.S29 - S38, 2006/03

 Times Cited Count:13 Percentile:54.2(Physics, Fluids & Plasmas)

The National Centralized Tokamak (NCT) facility program is a domestic research program for advanced tokamak research to succeed JT-60U incorporating Japanese university accomplishments. The mission of NCT is to establish high beta steady-state operation for DEMO and to contribute to ITER. The machine flexibility and mobility is pursued in aspect ratio and shape controllability, feedback control of resistive wall modes, wide current and pressure profile control capability for the demonstration of the high-b steady state.

Journal Articles

Engineering design and control scenario for steady-state high-beta operation in national centralized tokamak

Tsuchiya, Katsuhiko; Akiba, Masato; Azechi, Hiroshi*; Fujii, Tsuneyuki; Fujita, Takaaki; Fujiwara, Masami*; Hamamatsu, Kiyotaka; Hashizume, Hidetoshi*; Hayashi, Nobuhiko; Horiike, Hiroshi*; et al.

Fusion Engineering and Design, 81(8-14), p.1599 - 1605, 2006/02

 Times Cited Count:1 Percentile:89.15(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Plasma diagnostics in JFT-2M

Kasai, Satoshi*; Kamiya, Kensaku; Shinohara, Koji; Kawashima, Hisato; Ogawa, Hiroaki; Uehara, Kazuya; Miura, Yukitoshi; Okano, Fuminori; Suzuki, Sadaaki; Hoshino, Katsumichi; et al.

Fusion Science and Technology, 49(2), p.225 - 240, 2006/02

 Times Cited Count:3 Percentile:73.3(Nuclear Science & Technology)

The diagnostic system of JFT-2M has consisted of about 30 individual diagnostic instruments,which were used to study the plasma production, control, equilibrium, stability, confinement, plasma heating by NBI and/or RF (LH, ICRF, ECH) and current drive by RF. In these instruments, the motional Stark effect (MSE) polarimeter, charge exchanged recombination spectroscopy (CXRS), heavy-ion beam probe (HIBP), time of flight (TOF) neutral particle analyzer, etc. have contributed to make clear the improved mechanism of confinement such as H-mode and High Recycling Steady (HRS) H-mode, and to search the operational region of these modes.The infrared TV camera system and lost ion probe have played a very important role to investigate the heat load onto the walls due to ripple loss particles and escaping ions from core plasma, respectively.

Journal Articles

Design study of national centralized tokamak facility for the demonstration of steady state high-$$beta$$ plasma operation

Tamai, Hiroshi; Akiba, Masato; Azechi, Hiroshi*; Fujita, Takaaki; Hamamatsu, Kiyotaka; Hashizume, Hidetoshi*; Hayashi, Nobuhiko; Horiike, Hiroshi*; Hosogane, Nobuyuki; Ichimura, Makoto*; et al.

Nuclear Fusion, 45(12), p.1676 - 1683, 2005/12

 Times Cited Count:15 Percentile:50.65(Physics, Fluids & Plasmas)

Design studies are shown on the National Centralized Tokamak facility. The machine design is carried out to investigate the capability for the flexibility in aspect ratio and shape controllability for the demonstration of the high-beta steady state operation with nation-wide collaboration, in parallel with ITER towards DEMO. Two designs are proposed and assessed with respect to the physics requirements such as confinement, stability, current drive, divertor, and energetic particle confinement. The operation range in the aspect ratio and the plasma shape is widely enhanced in consistent with the sufficient divertor pumping. Evaluations of the plasma performance towards the determination of machine design are presented.

Journal Articles

Progress in physics and technology developments for the modification of JT-60

Tamai, Hiroshi; Matsukawa, Makoto; Kurita, Genichi; Hayashi, Nobuhiko; Urata, Kazuhiro*; Miura, Yushi; Kizu, Kaname; Tsuchiya, Katsuhiko; Morioka, Atsuhiko; Kudo, Yusuke; et al.

Plasma Science and Technology, 6(1), p.2141 - 2150, 2004/02

 Times Cited Count:2 Percentile:92.83(Physics, Fluids & Plasmas)

The dominant issue for the the modification program of JT-60 (JT-60SC) is to demonstrate the steady state reactor relevant plasma operation. Physics design on plasma parameters, operation scenarios, and the plasma control method are investigated for the achievement of high-$$beta$$. Engineering design and the R&D on the superconducting magnet coils, radiation shield, and vacuum vessel are performed. Recent progress in such physics and technology developments is presented.

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

Objectives and design of the JT-60 superconducting tokamak

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

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

 Times Cited Count:33 Percentile:27.31(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Observation of direct electron heating by the fast waves in the low-hybrid range of frequencies in the JFT-2M tokamak

Yamamoto, Takumi; Uesugi, Yoshihiko; Kawashima, Hisato; Hoshino, Katsumichi; ; Kasai, Satoshi; Kawakami, Tomohide; Kondoh, Takashi; Maeda, Hikosuke; Matsuda, Toshiaki; et al.

Physical Review Letters, 63(11), p.1148 - 1151, 1989/09

 Times Cited Count:17 Percentile:24.48(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports

Numerical simulation of non-inductive current drive for tokamak plasmas with time-varying electron temperatures

C.R.Neufeld*; Yoshino, Ryuji; Yamamoto, Takumi; Uesugi, Yoshihiko; Kawashima, Hisato

JAERI-M 89-103, 11 Pages, 1989/08

JAERI-M-89-103.pdf:0.53MB

no abstracts in English

Journal Articles

H mode observed in the JFT-2M tokamak with edge heating by electron cyclotron waves

Hoshino, Katsumichi; Yamamoto, Takumi; Kawashima, Hisato; Suzuki, Norio; Uesugi, Yoshihiko; Mori, Masahiro; ; Kasai, Satoshi; Kawakami, Tomohide; Matsuda, Toshiaki; et al.

Physical Review Letters, 63(7), p.770 - 773, 1989/08

 Times Cited Count:24 Percentile:19.14(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Edge pedestal during the H-mode of a tokamak plasma mesured by the electron cyclotron emission

Hoshino, Katsumichi; Yamamoto, Takumi; Kawashima, Hisato; Yamauchi, Toshihiko; Shoji, Teruaki; Suzuki, Norio; Uesugi, Yoshihiko

Journal of the Physical Society of Japan, 58(4), p.1248 - 1264, 1989/04

 Times Cited Count:6 Percentile:43.34(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports

Observation of H-mode by edge heating solely by electron cyclotron heating in a divertor configuration of JFT-2M tokamak

Hoshino, Katsumichi; Yamamoto, Takumi; Kawashima, Hisato; Suzuki, Norio; Uesugi, Yoshihiko; ; Kasai, Satoshi; Kawakami, Tomohide; Matsuda, Toshiaki; Miura, Yukitoshi; et al.

JAERI-M 89-038, 7 Pages, 1989/03

JAERI-M-89-038.pdf:0.29MB

no abstracts in English

Journal Articles

H-mode by edge ECH in JFT-2M

Hoshino, Katsumichi; Yamamoto, Takumi; Kawashima, Hisato; Tamai, Hiroshi; Ogawa, Toshihide; Odajima, Kazuo; Suzuki, Norio; Uesugi, Yoshihiko; Mori, Masahiro; ; et al.

Radio-Frequency Power in Plasmas, 4 Pages, 1989/00

no abstracts in English

Journal Articles

A New mode of improved confinement in discharges with stationary density in JEF-2M

Mori, Masahiro; Suzuki, Norio; Uesugi, Yoshihiko; Ogawa, Toshihide; Ogawa, Hiroaki; Otsuka, Hideo; Odajima, Kazuo; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; et al.

Nuclear Fusion, 28(10), p.1892 - 1897, 1988/10

 Times Cited Count:22 Percentile:26.51(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Particle accumulation at the edge observed in n$$_{e}$$ and T$$_{e}$$ profiles of H-mode JFT-2M plasma

Yamauchi, Toshihiko; Odajima, Kazuo; Uesugi, Yoshihiko; ; D.Dimock*; Kawashima, Hisato; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; Matsuda, Toshiaki; et al.

Physics Letters A, 131(4-5), p.301 - 309, 1988/08

 Times Cited Count:2 Percentile:64.95(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Steep gradient and pedestal of electron profiles in H-mode JFT-2M plasma

Yamauchi, Toshihiko; Hoshino, Katsumichi; Uesugi, Yoshihiko; ; Kawashima, Hisato; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; Matoba, Toru; Matsuda, Toshiaki; et al.

Japanese Journal of Applied Physics, 27(5), p.L924 - L926, 1988/05

 Times Cited Count:1 Percentile:90.1(Physics, Applied)

no abstracts in English

41 (Records 1-20 displayed on this page)