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

doi:10.1088/0029-5515/46/1/015

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

Research output: Contribution to journal › Article › peer-review

63 Citations (Scopus)

Abstract

Transient transport experiments are performed in plasmas with and without internal transport barriers (ITB) on LHD and JT-60U. The dependence of χ_e on the electron temperature, T_e, and on the electron temperature gradient, ∇T_e, 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 χ_e depends on T_e and ∇T_e in JT-60U, while the ∇T_e 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 T_e dependence of χ_e is observed inside the ITB region (LHD) and near the boundary of the ITB region (JT-60U).

Original language	English
Pages (from-to)	133-141
Number of pages	9
Journal	Nuclear Fusion
Volume	46
Issue number	1
DOIs	https://doi.org/10.1088/0029-5515/46/1/015
Publication status	Published - Jan 1 2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/46/1/015

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

In: Nuclear Fusion, Vol. 46, No. 1, 01.01.2006, p. 133-141.

Research output: Contribution to journal › Article › peer-review

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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).",

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AU - Inagaki, S.

AU - Takenaga, H.

AU - Ida, K.

AU - Isayama, A.

AU - Tamura, N.

AU - Takizuka, T.

AU - Shimozuma, T.

AU - Kamada, Y.

AU - Kubo, S.

AU - Miura, Y.

AU - Nagayama, Y.

AU - Kawahata, K.

AU - Sudo, S.

AU - Ohkubo, K.

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AB - 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).

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

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