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Journal Articles

Particle simulation of the transient behavior of one-dimensional SOL-divertor plasmas after an ELM crash

Takizuka, Tomonori; Hosokawa, Masanari*

Contributions to Plasma Physics, 46(7-9), p.698 - 703, 2006/09

 Times Cited Count:13 Percentile:44.28(Physics, Fluids & Plasmas)

Enhanced heat and particle fluxes to the divertor plates after an ELM crash in H-mode plasmas are the crucial issues for the tokamak reactor operation. Kinetic effect in the transient behaviour of SOL-divertor plasmas for this case is not yet well known. We investigate above problems with an advanced particle simulation code, PARASOL. Dependence of the particle and heat propagations on the collisionality is studied systematically. Effect of the particle recycling is also studied.

Journal Articles

Observation of the interaction between the geodesic acoustic mode and ambient fluctuation in the JFT-2M tokamak

Ido, Takeshi*; Miura, Yukitoshi; Hoshino, Katsumichi; Kamiya, Kensaku; Hamada, Yasuji*; Nishizawa, Akimitsu*; Kawasumi, Yoshiaki*; Ogawa, Hiroaki; Nagashima, Yoshihiko*; Shinohara, Koji; et al.

Nuclear Fusion, 46(5), p.512 - 520, 2006/05

 Times Cited Count:80 Percentile:93.3(Physics, Fluids & Plasmas)

The electrostatic fluctuation spectrum and the fluctuation-induced particle flux of the JFT-2M tokamak were estimated using the hevy ion beam probe (HIBP) measurement. A geodesic acoustic mode (GAM) of the frequency about15kHz was identified in the L-mode. The GAM has its peak at about 3cm inside of the separatrix with the electric field of about 1.4kV/m. The estimated turbulent particle flux is found to be intermittent. It is found that the density fluctuation is modulated by the GAM in the wide frequency range and the coherence analysis shows that the flucruation-induced particle flux is partially contributed by the GAM. In the H-mode the GAM disappears and the fluctuation and the flux is much decreased.The mechanism of the large burst-like flux in the L-mode is not understood yet and left as the future problem.

Journal Articles

Proposal of hot-pressed, rod-shaped tungsten armor concept for ITER divertor and its high-heat-flux performances

Sato, Kazuyoshi; Ezato, Koichiro; Taniguchi, Masaki; Suzuki, Satoshi; Akiba, Masato

Journal of Nuclear Science and Technology, 42(7), p.643 - 650, 2005/07

 Times Cited Count:4 Percentile:32.08(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Annular core experiments in HTTR's start-up core physics tests

Fujimoto, Nozomu; Yamashita, Kiyonobu*; Nojiri, Naoki; Takeuchi, Mitsuo; Fujisaki, Shingo; Nakano, Masaaki*

Nuclear Science and Engineering, 150(3), p.310 - 321, 2005/07

 Times Cited Count:5 Percentile:37.38(Nuclear Science & Technology)

Annular cores were formed in startup-core-physics tests of the High Temperature Engineering Test Reactor (HTTR) to obtain experimental data for verification of calculation codes. The first criticality, control rod positions at critical conditions, neutron flux distribution, excess reactivity etc. were measured as representative data. These data were evaluated with Monte Carlo code MVP that can consider the heterogeneity of coated fuel particles (CFP) distributed randomly in fuel compacts directly. It was made clear that the heterogeneity effect of CFP on reactivity for annular cores is smaller than that for fully-loaded cores. Measured and calculated effective multiplication factors (k) were agreed with differences less than 1%$$Delta$$k. Measured neutron flux distributions agreed with calculated results. The revising method was applied for evaluation of excess reactivity to exclude negative shadowing effect of control rods. The revised and calculated excess reactivity agreed with differences less than 1%$$Delta$$k/k.

Journal Articles

Sputtering yields of carbon based materials under high particle flux with low energy

Nakamura, Kazuyuki; *; Dairaku, Masayuki; Akiba, Masato; Araki, Masanori; Okumura, Yoshikazu

Journal of Nuclear Materials, 220-222, p.890 - 894, 1995/00

 Times Cited Count:19 Percentile:85.27(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Erosion of CFCs and W at high temperature under high heat loads

Nakamura, Kazuyuki; ; Sato, Kazuyoshi; Araki, Masanori; ; Dairaku, Masayuki; Akiba, Masato

Journal of Nuclear Materials, 212-215, p.2101 - 1205, 1994/00

no abstracts in English

Journal Articles

Low-energy neutral particle analysis by a time-of-flight method on JFT-2M

Miura, Yukitoshi; Okano, Fuminori

Review of Scientific Instruments, 61(11), p.3581 - 3585, 1990/11

 Times Cited Count:11 Percentile:74.51(Instruments & Instrumentation)

no abstracts in English

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