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Journal Articles

Discrepancy between modelled and measured radial electric fields in the scrape-off layer of divertor tokamaks; A Challenge for 2D fluid codes?

Chankin, A. V.*; Coster, D. P.*; Asakura, Nobuyuki; Bonnin, X.*; Conway, G. D.*; Corrigan, G.*; Erents, S. K.*; Fundamenski, W.*; Horacek, J.*; Kallenbach, A.*; et al.

Nuclear Fusion, 47(5), p.479 - 489, 2007/05

 Times Cited Count:30 Percentile:73.38(Physics, Fluids & Plasmas)

Radial electric field in known to be one of the drivers for the parallel ion flow in the SOL. It contributes to the ion Pfirsch-Schluter flow and determines the return parallel flow compensating poloidal ExB drift. It was established recently that 2D fluid codes EDGE2D and SOLPS underestimate the predicted Er in the SOL compared to experimentally measured values. The present work demonstrates that this underestimate can be responsible for the large discrepancy between measured and simulated parallel ion flows in the SOL. Provided radial electric field was modelled correctly by the codes, an increase in the predicted Mach number of the parallel ion flow by up to a factor 3 for the JET could be expected. This would entirely eliminate the difference between the experimentally determined part of the ion flow that depends on the toroidal field direction, and the modelled ion flow attributed to drifts. Discrepancy between measured and simulated flows in ASDEX-Upgrade was also reduced.

Journal Articles

Fast dynamics of type I ELMs and transport of the ELM pulse in JT-60U

Oyama, Naoyuki; Asakura, Nobuyuki; Chankin, A. V.; Oikawa, Toshihiro; Sugihara, Masayoshi; Takenaga, Hidenobu; Itami, Kiyoshi; Miura, Yukitoshi; Kamada, Yutaka; Shinohara, Koji; et al.

Nuclear Fusion, 44(5), p.582 - 592, 2004/05

 Times Cited Count:45 Percentile:81.82(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

On the poloidal localization and stability of multi-faceted asymmetric radiation from the edge (MARFE)

Chankin, A. V.

Physics of Plasmas, 11(4), p.1484 - 1492, 2004/04

 Times Cited Count:9 Percentile:28.06(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Edge localized mode physics and operational aspects in tokamaks

B$'e$coulet, M.*; Huysmans, G.*; Sarazin, Y.*; Garbet, X.*; Ghendrih, P.*; Rimini, F.*; Joffrin, E.*; Litaudon, X.*; Monier-Garbet, P.*; An$'e$, J.-M.*; et al.

Plasma Physics and Controlled Fusion, 45(12A), p.A93 - A113, 2003/12

 Times Cited Count:83 Percentile:92.45(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Asymmetry of collapse of density pedestal by type I ELM on JT-60U

Oyama, Naoyuki; Miura, Yukitoshi; Chankin, A. V.; Takenaga, Hidenobu; Asakura, Nobuyuki; Kamada, Yutaka; Oikawa, Toshihiro; Shinohara, Koji; Takeji, Satoru

Nuclear Fusion, 43(10), p.1250 - 1257, 2003/10

 Times Cited Count:16 Percentile:48.5(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER

Loarte, A.*; Saibene, G.*; Sartori, R.*; Campbell, D.*; Becoulet, M.*; Horton, L.*; Eich, T.*; Herrmann, A.*; Matthews, G.*; Asakura, Nobuyuki; et al.

Plasma Physics and Controlled Fusion, 45(9), p.1549 - 1569, 2003/10

 Times Cited Count:408 Percentile:99.77(Physics, Fluids & Plasmas)

Analysis of Type I ELMs from ongoing experiments shows that ELM energy losses are correlated with the density and temperature of the pedestal plasma before the ELM crash. The Type I ELM plasma energy loss normalized to the pedestal energy is found to correlate across experiments with the collisionality of the pedestal plasma. Other parameters affect the ELM size such as the edge magnetic shear, etc, which influence the plasma volume affected by the ELMs. ELM particle losses are influenced by this ELM affected volume and are weakly dependent on other pedestal plasma parameters. In JET and DIII-D, minimum Type I ELMs with energy losses acceptable for ITER were found, that do not affect the plasma temperature. The duration of the divertor ELM power pulse is correlated with the typical ion transport time from the pedestal to the divertor target and not with the duration of the ELM associated MHD activity. Extrapolation of the present experimental results to ITER is summarized.

Journal Articles

Influence of Plasma-wall interactions on the behaviour of ELMs in JT-60U

Chankin, A. V.; Asakura, Nobuyuki; Fukuda, Takeshi; Isayama, Akihiko; Itami, Kiyoshi; Kamada, Yutaka; Kubo, Hirotaka; Miura, Yukitoshi; Nakano, Tomohide; Oyama, Naoyuki; et al.

Journal of Nuclear Materials, 313-316, p.828 - 833, 2003/03

 Times Cited Count:21 Percentile:80.27(Materials Science, Multidisciplinary)

In JT-60U, extensive plasma-neutral exchange during a typical type I ELM leads to a transient increase in the total number of charged particles in the plasma. The density rise is especially large at the edge, with the increase in the inner vertical interferometer signal (FIR1) of up to 40%, in the case of a giant ELM. Fast measurements of edge plasma density, electron temperature, magnetic fluctuations and Bremsstrahlung emission have been conducted to study the dynamics of the ELM evolution. In order to pinpoint the exact location of the density rise, a dedicated set of experiments with the horizontal plasma sweep to scan the separatrix position at the inner midplane with respect to the FIR1 chord, has been carried out at different wall conditions.

Journal Articles

ELM energy and particle losses and their extrapolation to burning plasma experiments

Loarte, A.*; Saibene, G.*; Sartori, R.*; Becoulet, M.*; Horton, L.*; Eich, T.*; Herrmann, A.*; Laux, M.*; Matthews, G.*; Jachmich, S.*; et al.

Journal of Nuclear Materials, 313-316, p.962 - 966, 2003/03

 Times Cited Count:105 Percentile:98.54(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Global circulation of drift flows in the SOL and divertor and its impact on divertor asymmetries

Chankin, A. V.; Stangeby, P. C.*

Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00

no abstracts in English

Journal Articles

Fast ELM dynamics in JT-60U

Chankin, A. V.; Asakura, Nobuyuki; Fukuda, Takeshi; Isayama, Akihiko; Kamada, Yutaka; Miura, Yukitoshi; Oyama, Naoyuki; Takeji, Satoru; Takenaga, Hidenobu

Nuclear Fusion, 42(6), p.733 - 742, 2002/06

 Times Cited Count:20 Percentile:56.43(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

H-mode density limit and detachment in JT-60U

Chankin, A. V.; Itami, Kiyoshi; Asakura, Nobuyuki

Plasma Physics and Controlled Fusion, 44(5A), p.A399 - A405, 2002/05

 Times Cited Count:10 Percentile:34.93(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Modeling of the current hole in a tokamak

Chankin, A. V.; Mukhovatov, V. S.*; Fujita, Takaaki; Miura, Yukitoshi

Europhysics Conference Abstracts (CD-ROM), 26B, 4 Pages, 2002/00

no abstracts in English

Journal Articles

Studies of ELM heat load, SOL flow and carbon erosion from existing Tokamak experiments, and projections for ITER

Asakura, Nobuyuki; Loarte, A.*; Porter, G.*; Philipps, V.*; Lipschultz, B.*; Kallenbach, A.*; Matthews, G.*; Federici, G.*; Kukushkin, A.*; Mahdavi, A.*; et al.

IAEA-CN-94/CT/P-01, 5 Pages, 2002/00

Three important physics issues for the ITER divertor design and operation are summarized based on the experimental and numerical work from multi-machine database (JET, JT-60U, ASDEX Upgrade, DIII-D, Alcator C-Mod and TEXTOR). (i) The energy load associated with Type-I ELMs is of great concern for the lifetime of the ITER divertor target. In order to understand the physics base of the scaling models, the ELM heat and particle transport to the divertor is investigated. Convective transport during ELMs plays an important role in heat transport to the divertor. (ii) Determination of the SOL flow pattern and the driving mechanism has progressed experimentally and numerically. Influences of the drift effects on the SOL and divertor plasma transport were discussed. (iii) Characteristics of chemical yield at two different deposited carbon surfaces, i.e. erosion- and redeposition-dominated areas, have been studied. Progress of understanding the chemical erosion is reviewed.

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

15 (Records 1-15 displayed on this page)
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