Properties of internal transport barrier formation in JT-60U

Sakamoto, Yoshiteru; Suzuki, Takahiro; Ide, Shunsuke; Koide, Yoshihiko; Takenaga, Hidenobu; Kamada, Yutaka; Fujita, Takaaki; Fukuda, Takeshi; Takizuka, Tomonori; Shirai, Hiroshi; et al.

Nuclear Fusion, 44(8), p.876 - 882, 2004/08

https://doi.org/10.1088/0029-5515/44/8/006

Response of the ion thermal diffusivity to the radial electric field Er shear has been investigated in JT-60U and the following results were found. (1) In the case of positive magnetic shear (PS) plasma, the ion thermal diffusivity in the core region shows L mode state, weak internal transport barrier (ITB), and strong ITB depending upon the heating power. In the case of reversed magnetic shear (RS) plasma, however, no power degradation of the ion thermal diffusivity is observed. (2) In the case of weak ITB, the ion thermal diffusivity decreases gradually with increasing the Er shear for both PS and RS plasmas. There exists a threshold of an effective Er shear to change its state from weak to strong ITBs. (3) The threshold of the effective Er shear in the case of RS plasma is small compared with that in the case of PS plasma.

Heat transport analyses

Shirai, Hiroshi

Purazuma, Kaku Yugo Gakkai-Shi, 79(7), p.691 - 705, 2003/07

http://ci.nii.ac.jp/naid/130000133823

Methods for heat transport analysis and heat transport simulation in toroidal plasmas are summarized on the basis of energy balance equation. Joule heating, NBI heating, RF heating and heating are briefly explained. Among the energy loss mechanism, the conduction loss and the radiation loss dominate in the core plasma region and the peripheral region, respectively. In tokamaks, the anomalous transport caused by microturbulence is much larger than the neoclassical transport. The other mechanisms of enhanced transport, the sawtooth oscillation and the magnetic island formation, are also shown.

Dynamics and interplay of L-H-L transitions and ITB events in reversed shear plasmas with internal barrieres in JT-60U

Neudatchin, S. V.; Takizuka, Tomonori; Shirai, Hiroshi; Fujita, Takaaki; Isayama, Akihiko; Kamada, Yutaka; Koide, Yoshihiko; Suzuki, Takahiro; Takeji, Satoru

Plasma Physics and Controlled Fusion, 44(5A), p.A383 - A389, 2002/05

https://doi.org/10.1088/0741-3335/44/5A/341

no abstracts in English

Dynamic behavior of transport in normal and reversed shear plasmas with internal barriers in JT-60U

Neudatchin, S. V.; Takizuka, Tomonori; Shirai, Hiroshi; Fujita, Takaaki; Isayama, Akihiko; Kamada, Yutaka; Koide, Yoshihiko; Dnestrovskij, Y. N.*

JAERI-Research 2001-056, 32 Pages, 2001/12

JAERI-Research-2001-056.pdf:1.31MB

no abstracts in English

Dynamic behavior of transport in normal and reversed shear plasmas with internal barriers in JT-60U

Neudatchin, S. V.; Takizuka, Tomonori; Dnestrovskij, Y. N.*; Shirai, Hiroshi; Fujita, Takaaki; Isayama, Akihiko; Kamada, Yutaka; Koide, Yoshihiko

Proceedings of IAEA 18th Fusion Energy Conference (CD-ROM), 5 Pages, 2001/00

no abstracts in English

Analysis of internal transport barrier heat diffusivity from heat pulse propagation created by abrupt variation of diffusivity in JT-60U reverse shear plasmas

Neudatchin, S. V.; Takizuka, Tomonori; Shirai, Hiroshi; Fujita, Takaaki; Isayama, Akihiko; Koide, Yoshihiko; Kamada, Yutaka

JAERI-Research 99-063, p.38 - 0, 1999/11

JAERI-Research-99-063.pdf:1.7MB

no abstracts in English

Formation condition of internal transport barrier in JT-60U plasmas

Koide, Yoshihiko; Fujita, Takaaki; Takizuka, Tomonori; Shirai, Hiroshi; Hatae, Takaki; Isayama, Akihiko; Isei, Nobuaki; Sakamoto, Yoshiteru; Kamada, Yutaka; Kikuchi, Mitsuru; et al.

IAEA-F1-CN-69/EX5/2 (CD-ROM), 8 Pages, 1999/00

no abstracts in English

Abrupt in time and wide in space variations of heat diffusivity during ITB formation in JT-60U reverse shear discharges

Neudatchin, S. V.*; Takizuka, Tomonori; Shirai, Hiroshi; Fujita, Takaaki; Isei, Nobuaki; Isayama, Akihiko; Koide, Yoshihiko; Kamada, Yutaka

Plasma Physics and Controlled Fusion, 41(10), p.L39 - L47, 1999/00

https://doi.org/10.1088/0741-3335/41/10/101

no abstracts in English

Transport model of boundary plasma and estimation of transport coefficients

Uehara, Kazuya; Tsushima, Akira*; *

Czechoslovak Journal of Physics, 48(SUPPL.S2), p.339 - 344, 1998/00

no abstracts in English

Determination of particle transport coefficients in reversed shear plasma of JT-60U

Takenaga, Hidenobu; Nagashima, Keisuke; Sakasai, Akira; Oikawa, Toshihiro; Fujita, Takaaki

Plasma Physics and Controlled Fusion, 40(2), p.183 - 190, 1998/00

https://doi.org/10.1088/0741-3335/40/2/002

no abstracts in English