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Togo, Satoshi*; Takizuka, Tomonori*; Nakamura, Makoto; Hoshino, Kazuo; Ogawa, Yuichi*
Journal of Nuclear Materials, 463, p.502 - 505, 2015/08
Times Cited Count：9 Percentile：60.64(Materials Science, Multidisciplinary)A 1D SOL-divertor plasma simulation code introducing the anisotropic ion temperature with virtual divertor model has been developed. By introducing the anisotropic ion temperature directly, the second-derivative parallel ion viscosity term in the momentum transport equation can be excluded and the boundary condition at the divertor plate becomes unnecessary. In order to express the effects of the divertor plate and accompanying sheath implicitly, the virtual divertor model has been introduced which has an artificial sinks of particle, momentum and energy. The virtual divertor model makes the periodic boundary condition available. By using this model, SOL-divertor plasmas satisfying the Bohm condition has been successfully obtained. Also investigated are the dependence of the ion temperature anisotropy on the normalized mean free path of ion and the validity of the approximated parallel ion viscosity for the Braginskii expression and the limited one.
Ishii, Yasutomo; Azumi, Masafumi*; Smolyakov, A. I.*
Journal of Plasma Physics, 72(6), p.1243 - 1248, 2006/12
Times Cited Count：1 Percentile：3.54(Physics, Fluids & Plasmas)no abstracts in English
Asakura, Nobuyuki; Takenaga, Hidenobu; Sakurai, Shinji; Porter, G. D.*; Rognlien, T. D.*; Rensink, M. E.*; Shimizu, Katsuhiro; Higashijima, Satoru; Kubo, Hirotaka
Nuclear Fusion, 44(4), p.503 - 512, 2004/04
Times Cited Count：73 Percentile：89.68(Physics, Fluids & Plasmas)The measurements of the SOL flow and plasma profiles both at the high-field-side (HFS) and low-field-side (LFS), for the first time, found out the SOL flow pattern and its driving mechanism. "Flow reversal" was found near the HFS and LFS separatrix of the main plasma for the ion ▽B drift direction towards the divertor. Radial profiles of the SOL flow were similar to those calculated numerically using the UEDGE code with the plasma drifts included although Mach numbers in measurements were faster than those obtained numerically. Particle fluxes towards the HFS and LFS divertors produced by the parallel SOL flow and Er
B drift flow were evaluated. The particle flux for the case of intense gas puff and divertor pump (puff and pump) was investigated, and it was found that both flow velocity and collisionality were enhanced, in particular, at HFS SOL. Drift flux in the private flux region was also evaluated, and important physics issues for the divertor design and operation, such as in-out asymmetries of the heat and particle fluxes, and control of impurity ions were investigated.
Asakura, Nobuyuki; Sakurai, Shinji; Itami, Kiyoshi; Naito, Osamu; Takenaga, Hidenobu; Higashijima, Satoru; Koide, Yoshihiko; Sakamoto, Yoshiteru; Kubo, Hirotaka; Porter, G. D.*
Journal of Nuclear Materials, 313-316, p.820 - 827, 2003/03
Times Cited Count：36 Percentile：89.58(Materials Science, Multidisciplinary)no abstracts in English
Porter, G. D.*; Rognlien, T. D.*; Rensink, M. E.*; Loarte, A.*; Asakura, Nobuyuki; Takenaga, Hidenobu; Matthews, G.*; Contributors to JET-EFDA Workprogramme*
Journal of Nuclear Materials, 313-316, p.1085 - 1088, 2003/03
Times Cited Count：24 Percentile：81.86(Materials Science, Multidisciplinary)no abstracts in English
Asakura, Nobuyuki; Shimizu, Katsuhiro; Nakano, Tomohide; Higashijima, Satoru; Kubo, Hirotaka; Takenaga, Hidenobu
Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00
The measurements of the parallel SOL flow (Mach number, M) and electric field (Er) both at the high-field-side (HFS) and low-field-side (LFS) have been accomplished using Mach probes in JT-60U. Particle fluxes towards the HFS and LFS divertors produced by the parallel SOL flow (niMCs) and ErxB drift flow (niEr/B) were evaluated. For the case of intense gas puffing from the plasma top (puff and pump), Zeff was reduced largely to 1.3, comparing to 1.42 for the divertor gas puff. It was found that both M and ni in niMCs were enhanced, in particular, at HFS. On the other hand, niEr/B for the two cases were comparable since ni increased and Er decreased for the puff and pump. Friction force and thermal force on impurity ions were estimated from the measured M, ne, Te and Ti, and ratios of Ffric/Fi-therm at HFS increased to 3-4 compared to 1.5-1.8 for the divertor gas puff. This result was consistent with a conventional model of reduction in Zeff. Two-dimensional transport of the carbon impurity at the HFS and LFS divertors was discussed using IMPMC (Impurity Monte-Carlo) code.
Asakura, Nobuyuki; Takenaga, Hidenobu; Sakurai, Shinji; Sakasai, Akira; Tamai, Hiroshi; Shimizu, Katsuhiro; Porter, G. D.*
Plasma Physics and Controlled Fusion, 44(10), p.2101 - 2119, 2002/10
Times Cited Count：21 Percentile：54.51(Physics, Fluids & Plasmas)no abstracts in English
Asakura, Nobuyuki; Sakurai, Shinji; Naito, Osamu; Itami, Kiyoshi; Miura, Yukitoshi; Higashijima, Satoru; Koide, Yoshihiko; Sakamoto, Yoshiteru
Plasma Physics and Controlled Fusion, 44(5A), p.A313 - A321, 2002/05
Times Cited Count：22 Percentile：57.23(Physics, Fluids & Plasmas)no abstracts in English
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.
Asakura, Nobuyuki; Sakurai, Shinji; Shimada, Michiya; Koide, Yoshihiko; Hosogane, Nobuyuki; Itami, Kiyoshi
Physical Review Letters, 84(14), p.3093 - 3096, 2000/04
Times Cited Count：65 Percentile：87.76(Physics, Multidisciplinary)no abstracts in English
Asakura, Nobuyuki; Sakurai, Shinji; Hosogane, Nobuyuki; Shimada, Michiya; Itami, Kiyoshi; Koide, Yoshihiko; Naito, Osamu
Nuclear Fusion, 39(11Y), p.1983 - 1994, 1999/11
Times Cited Count：50 Percentile：80.84(Physics, Fluids & Plasmas)no abstracts in English
Sasaki, Akira; *; Tajima, Toshiki*; *
Computational Fluid Dynamics Journal, 8(1), p.142 - 148, 1999/04
no abstracts in English
Asakura, Nobuyuki; Hosogane, Nobuyuki; Itami, Kiyoshi; Sakasai, Akira; Sakurai, Shinji; Shimada, Michiya; Kubo, Hirotaka; Higashijima, Satoru; Shimizu, Katsuhiro; Takenaga, Hidenobu; et al.
Journal of Nuclear Materials, 266-269, p.182 - 188, 1999/00
Times Cited Count：66 Percentile：96.68(Materials Science, Multidisciplinary)no abstracts in English
Asakura, Nobuyuki; Sakurai, Shinji; Hosogane, Nobuyuki; Shimada, Michiya; Itami, Kiyoshi; Koide, Yoshihiko; Naito, Osamu
Nuclear Fusion, 39(11Y), p.1983 - 1994, 1999/00
no abstracts in English
*; Uehara, Kazuya; *
Japanese Journal of Applied Physics, Part 1, 36(11), p.6992 - 6993, 1997/11
Times Cited Count：6 Percentile：36.78(Physics, Applied)no abstracts in English
*; Uehara, Kazuya; *
Proc. of 24th European Physical Society Conf. on Controlled Fusion and Plasma Physics, 21A, p.709 - 712, 1997/00
no abstracts in English
B.M.Annaratone*; Shoji, Teruaki; Maeda, Hikosuke; *; Tamai, Hiroshi; JFT-2M Group
Nuclear Fusion, 34(11), p.1453 - 1459, 1994/00
Times Cited Count：5 Percentile：24.25(Physics, Fluids & Plasmas)no abstracts in English
Kaku Yugo Kenkyu, 18(1), p.1 - 11, 1966/00
no abstracts in English
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Kaku Yugo Kenkyu, 14(5), p.510 - 520, 1965/00
no abstracts in English
Kaku Yugo Kenkyu, 15(4), p.413 - 419, 1965/00
no abstracts in English
