Dynamic transport study of the plasmas with transport improvement in LHD and JT-60U

K. Ida, Y. Sakamoto, S. Inagaki, H. Takenaga, A. Isayama, G. Matsunaga, R. Sakamoto, K. Tanaka, S. Ide, T. Fujita, H. Funaba, S. Kubo, M. Yoshinuma, T. Shimozuma, Y. Takeiri, K. Ikeda, C. Michael, T. Tokuzawa

Research output: Contribution to journalArticle

11 Citations (Scopus)


Transport analysis during the transient phase of heating (a dynamic transport study) applied to the plasma with internal transport barriers (ITBs) in the Large Helical Device (LHD) heliotron and the JT-60U tokamak is described. In the dynamic transport study the time of transition from the L-mode plasma to the ITB plasma is clearly determined by the onset of flattening of the temperature profile in the core region and a spontaneous phase transition from a zero curvature ITB (hyperbolic tangent shaped ITB) or a positive curvature ITB (concaved shaped ITB) to a negative curvature ITB (convex shaped ITB) and its back-transition are observed. The flattening of the core region of the ITB transition and the back-transition between a zero curvature ITB and a convex ITB suggest the strong interaction of turbulent transport in space.

Original languageEnglish
Article number015005
JournalNuclear Fusion
Issue number1
Publication statusPublished - Jan 1 2009


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Ida, K., Sakamoto, Y., Inagaki, S., Takenaga, H., Isayama, A., Matsunaga, G., ... Tokuzawa, T. (2009). Dynamic transport study of the plasmas with transport improvement in LHD and JT-60U. Nuclear Fusion, 49(1), [015005]. https://doi.org/10.1088/0029-5515/49/1/015005