Comparison of transient electron heat transport in LHD helical and JT-60U tokamak plasmas

S. Inagaki, H. Takenaga, K. Ida, A. Isayama, N. Tamura, T. Takizuka, T. Shimozuma, Y. Kamada, S. Kubo, Y. Miura, Y. Nagayama, K. Kawahata, S. Sudo, K. Ohkubo

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Abstract

Transient transport experiments are performed in plasmas with and without internal transport barriers (ITB) on LHD and JT-60U. The dependence of χe on the electron temperature, Te, and on the electron temperature gradient, ∇Te, is analysed with an empirical non-linear heat transport model. In plasmas without an ITB, two different types of non-linearity of the electron heat transport are observed from cold/heat pulse propagation: the χe depends on Te and ∇Te in JT-60U, while the ∇Te dependence is weak in LHD. Inside the ITB region, there is none or weak ∇T e dependence both in LHD and JT-60U. Growth of the cold pulse driven by the negative Te dependence of χe is observed inside the ITB region (LHD) and near the boundary of the ITB region (JT-60U).

Original languageEnglish
Pages (from-to)133-141
Number of pages9
JournalNuclear Fusion
Volume46
Issue number1
DOIs
Publication statusPublished - Jan 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Inagaki, S., Takenaga, H., Ida, K., Isayama, A., Tamura, N., Takizuka, T., Shimozuma, T., Kamada, Y., Kubo, S., Miura, Y., Nagayama, Y., Kawahata, K., Sudo, S., & Ohkubo, K. (2006). Comparison of transient electron heat transport in LHD helical and JT-60U tokamak plasmas. Nuclear Fusion, 46(1), 133-141. https://doi.org/10.1088/0029-5515/46/1/015