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Journal Articles

Observations of the collapse and recovery of the temperature pedestal using diagnostics with the fast temporal resolution in JT-60U

Yoshida, Maiko; Kobayashi, Shinji*; Urano, Hajime; Oyama, Naoyuki; Koide, Yoshihiko; Sakamoto, Yoshiteru; Takenaga, Hidenobu; Kamada, Yutaka; JT-60 Team

Plasma Physics and Controlled Fusion, 48(5A), p.A209 - A215, 2006/05

https://doi.org/10.1088/0741-3335/48/5A/S20

Times Cited Count：11 Percentile：36.93(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Multi-machine comparisons of H-mode separatrix densities and edge profile behaviour in the ITPA SOL and Divertor Physics Topical Group

Kallenbach, A.*; Asakura, Nobuyuki; Kirk, A.*; Korotkov, A.*; Mahdavi, M. A.*; Mossessian, D.*; Porter, G. D.*

Journal of Nuclear Materials, 337-339, p.381 - 385, 2005/03

https://doi.org/10.1016/j.jnucmat.2004.10.099

Times Cited Count：66 Percentile：96.55(Materials Science, Multidisciplinary)

Edge profile data for H-mode discharges in 6 tokamaks have been analysed with the main focus on the edge density profile as well as electron temperature and density gradient lengths and steep gradient zone widths. A uniform procedure of data treatment and assignment of the separatrix position via power balance allowed to put the multi-machine data on an even base. The machine size appears to be the leading parameter for the width of the steep edge transport barrier gradient zone, as well as for the temperature decay length at the separatrix. Effects associated with neutral penetration physics are visible in the edge density profile.

Journal Articles

Profile control and plasma start-up by RF waves towards advanced tokamak operation in JT-60U

Takase, Yuichi*; JT-60 Team

AIP Conference Proceedings 694, p.235 - 242, 2003/05

https://doi.org/10.1063/1.1638033

A central electron temperature of 23 keV was obtained by EC wave injection. A highly localized current density profile was obtained by central ECCD, indicating an upper limit on the diffusion coefficient for resonant electrons of $1{rm m^{2}/s}$ . The experimentally obtained current drive figure of merit was lower than theoretical prediction, possibly because of the negative loop voltage induced by overdrive. A comparison of HFS and LFS off-axis ECCD confirmed the theoretically expected trapped particle effect on the current drive efficiency. Offaxis LHCD was used to broaden the qmin radius and the ITB foot radius. N-NBCD was used to shrink the current hole radius. An integrated scenario consisting of (1) a novel plasma start-up method using RF plasma production and induction by vertical field and shaping coils, (2) a noninductive ramp-up stage, and (3) a transition to a high-density, bootstrap-dominated, highconfinement plasma, without the use of the OH solenoid, has been demonstrated. The plasma created by this technique had both internal and edge transport barriers, with $beta_{rm p}=3.6$ ( $epsilonbeta_{rm p}=1$ ), $beta_{rm N}=1.6$ , $H_{rm H98y2}=1.6$ and $f_{rm BS}geq90%$ at $I_{rm p}=0.6$ MA and $n_{rm e}=0.5n_{rm GW}$ .

Journal Articles

Profile and shape control of the plasmas with transport barriers towards the sustainment of high integrated performance in JT-60U

Kamada, Yutaka; JT-60 Team

Purazuma, Kaku Yugo Gakkai-Shi, 78(9), p.949 - 967, 2002/09

http://ci.nii.ac.jp/naid/10009630050

no abstracts in English