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Journal Articles

Study of SOL/divertor plasmas in JFT-2M

Kawashima, Hisato; Sengoku, Seio; Uehara, Kazuya; Tamai, Hiroshi; Shoji, Teruaki*; Ogawa, Hiroaki; Shibata, Takatoshi; Yamamoto, Masahiro*; Miura, Yukitoshi; Kusama, Yoshinori; et al.

Fusion Science and Technology, 49(2), p.168 - 186, 2006/02

 Times Cited Count:3 Percentile:23.75(Nuclear Science & Technology)

Experimental efforts on JFT-2M have been devoted to understand SOL/Divertor plasmas and to investigate power and particle controllability. Open divertor configuration was used for the first decade of JFT-2M started in 1984. We found out the SOL/Divertor plasma properties such as in/out asymmetry, heat and particle diffusivities, and SOL current at ELMs. Handling of power and particle was demonstrated by active control methods such as local pumping, edge ergodization, divertor biasing, and edge heating. For improvement of power and particle control capability of divertor, it was modified to closed configuration in 1995, which demonstrated the baffling effects with narrower divertor throat. Dense and cold divertor state (n$$_{e}$$$$^{div}$$ = 4$$times$$10$$^{19}$$ m$$^{-3}$$ and T$$_{e}$$$$^{div}$$ = 4 eV), compatible with the improved confinement modes (e.g. H-mode), was realized by strong gas puffing. Being related with the core confinement at H-mode, the edge plasma fluctuations were identified by an electrostatic probe. These are reviewed in this paper.

Journal Articles

Progress of boundary plasma investigation toward ITER

Shimada, Michiya

Purazuma, Kaku Yugo Gakkai-Shi, 80(3), p.222 - 226, 2004/03

Discussion is made on objectives of edge plasma and plasma-wall interaction studies, divertor performance projection of ITER and key R&D issues on plasma-wall interaction including material issues, tritium retention, and transient events like ELMs and disruptions. A perspective of future development is discussed for the purpose of projection to and control of ITER plasma.

Journal Articles

Two-dimensional particle simulation of the flow control in SOL and divertor plasmas

Takizuka, Tomonori; Hosokawa, Masanari*; Shimizu, Katsuhiro

Journal of Nuclear Materials, 313-316(1-3), p.1331 - 1334, 2003/03

 Times Cited Count:15 Percentile:68.28(Materials Science, Multidisciplinary)

In course of tokamak fusion research, particle and heat control is one of the most crucial issues. Helium ash exhaust and impurity retention in the divertor region owe to the plasma flow towards divertor plate. The localization of heat load on the plate depends on the flow pattern. Accordingly, particle and heat control can be achieved by the proper control of the flow in SOL and divertor plasmas. In this paper, the flow control is studied with two-dimensional particle simulations by PARASOL (PARticle Advanced simulation for SOL and divertor plasmas) code. Magnetic field configuration with separatrix like a tokamak divertor configuration is given. Hot particle source is put in the core plasma. Recycling cold particle source is located near the divertor plate. Particle source of gas puff in the SOL plasma is given for the flow control. Divertor biasing is available by changing the electrostatic potential on the plates. Effects of gas puff and biasing on the flow are studied. Controllability is evaluated from simulation results.

JAEA Reports

Comparison of HTGR fuel design, manufacture and quality control methods between Japan and China

Fu, X.*; Takahashi, Masashi; Ueta, Shohei; Sawa, Kazuhiro

JAERI-Tech 2002-049, 35 Pages, 2002/05

JAERI-Tech-2002-049.pdf:3.01MB

no abstracts in English

Journal Articles

Spectroscopic study of JT-60U divertor plasma

Kubo, Hirotaka; Higashijima, Satoru; Takenaga, Hidenobu; Kumagai, Akira*; Shimizu, Katsuhiro; Sugie, Tatsuo; Suzuki, Shingo; Sakasai, Akira; Asakura, Nobuyuki

NIFS-PROC-44, p.65 - 68, 2000/01

no abstracts in English

Journal Articles

ITER physics basis, 4; Power and particle control

ITER Physics Expert Group on Divertor; ITER Physics Expert Group on Divertor Modelling and Database

Nuclear Fusion, 39(12), p.2391 - 2469, 1999/00

 Times Cited Count:265 Percentile:65.00(Physics, Fluids & Plasmas)

no abstracts in English

JAEA Reports

Studies on development of pressure measurement methods for a large fusion experimental device

Ogiwara, Norio

JAERI-M 91-007, 151 Pages, 1991/02

JAERI-M-91-007.pdf:2.92MB

no abstracts in English

Journal Articles

Particles for testing of air filters

Ikezawa, Yoshio

Kuki Seijo, 28(3), p.630 - 647, 1990/08

no abstracts in English

Journal Articles

The Situation of JPDR decommissioning

; Ikezawa, Yoshio

Hoken Butsuri, 25(3), p.294 - 298, 1990/00

no abstracts in English

Journal Articles

JT-60 divertor pumping system and its initial operation in ohmically heated divertor discharges

Ando, T.; Nakamura, H.; Yoshida, H.; Sunaoshi, H.; Arai, T.; Akino, N.; Hiroki, S.; Yamamoto, Masahiro; Okubo, Minoru; Shimizu, M.*; et al.

Proc. 14th Symp. on Fusion Technology, 1986, Vol.1, p.615 - 620, 1987/00

no abstracts in English

JAEA Reports

Particle Control in a Tokamak

Sengoku, Seio

JAERI-M 86-036, 13 Pages, 1986/03

JAERI-M-86-036.pdf:0.62MB

no abstracts in English

Journal Articles

Analysis of pumping requirement for exhausting duct in close vicinity of divertor in tokamak reactor

; ; ; ;

Nucl.Technol./Fusion, 4, p.498 - 507, 1983/00

no abstracts in English

JAEA Reports

Production of ThO$$_{2}$$ Kernels by Sol-gel Process

; ; ; Shiba, Koreyuki

JAERI 1271, 37 Pages, 1981/06

JAERI-1271.pdf:2.65MB

no abstracts in English

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