Transition between internal transport barriers with different temperature-profile curvatures in JT-60U tokamak plasmas

K. Ida, Y. Sakamoto, H. Takenaga, N. Oyama, K. Itoh, M. Yoshinuma, S. Inagaki, T. Kobuchi, A. Isayama, T. Suzuki, T. Fujita, G. Matsunaga, Y. Koide, M. Yoshida, S. Ide, Y. Kamada

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Abstract

A spontaneous transition phenomena between two states of a plasma with an internal transport barrier (ITB) is observed in the steady-state phase of the magnetic shear in the negative magnetic shear plasma in the JT-60U tokamak. These two ITB states are characterized by different profiles of the second radial derivative of the ion temperature inside the ITB region (one has a weak concave shape and the other has a strong convex shape) and by different degrees of sharpness of the interfaces between the L mode and the ITB region, which is determined by the turbulence penetration into the ITB region.

Original languageEnglish
Article number055003
JournalPhysical review letters
Volume101
Issue number5
DOIs
Publication statusPublished - Jul 31 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Ida, K., Sakamoto, Y., Takenaga, H., Oyama, N., Itoh, K., Yoshinuma, M., Inagaki, S., Kobuchi, T., Isayama, A., Suzuki, T., Fujita, T., Matsunaga, G., Koide, Y., Yoshida, M., Ide, S., & Kamada, Y. (2008). Transition between internal transport barriers with different temperature-profile curvatures in JT-60U tokamak plasmas. Physical review letters, 101(5), [055003]. https://doi.org/10.1103/PhysRevLett.101.055003