Realization of high T i plasmas and confinement characteristics of ITB plasmas in the LHD deuterium experiments

Nuclear Fushion

article

H. Takahashi¹  K. Nagaoka¹  K. Mukai¹  M. Yokoyama¹  S. Murakami⁴  S. Ohdachi¹  T. Bando⁵  Y. Narushima¹  H. Nakano¹  M. Osakabe¹  K. Ida¹  M. Yoshinuma¹  R. Seki¹  H. Yamaguchi¹  K. Tanaka¹  M. Nakata¹  F. Warmer⁶  T. Oishi¹  M. Goto¹  S. Morita¹  T.I. Tsujimura¹  S. Kubo¹  T. Kobayashi¹  I. Yamada¹  C. Suzuki¹  M. Emoto¹  T. Ido¹  A. Shimizu¹  T. Tokuzawa¹  K. Nagasaki⁸  T. Morisaki¹  Y. Takeiri¹  the LHD Experiment Group¹ 

[1] National Institute for Fusion Science, National Institutes of Natural Sciences;SOKENDAI ,(The Graduate University for Advanced Studies);Department of Physics, Nagoya University;Department of Nuclear Engineering, Kyoto University;Fusion Energy Research and Development Directorate, National Institutes for Quantum and Radiological Science and Technology;Max Planck Institute for Plasma Physics;Department of Energy Engineering and Science, Nagoya University;Institute of Advanced Energy, Kyoto University

关键词: isotope effect;    ITB;    LHD;   

DOI  :  10.1088/1741-4326/aad87e

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

The deuterium (D) operation was initiated in the LHD in 2017. In the first campaign of the D experiments, we successfully extended the high temperature regime in the LHD. The new record of the ion temperature ( T _i) of 10 keV associated with the ion internal transport barrier (ITB) was achieved due to several operational optimization. The thermal confinement characteristics of ITB plasmas were compared between hydrogen and D discharges. The effective ion thermal diffusivity of the ion-ITB plasmas was found to be smaller in the D discharges than that in the H discharges. The profiles of theT _i, the electron density, and the impurity of the highT _i plasmas strongly depended on the magnetic configuration and these profiles tended to peaked in the inward-shifted configuration. It was also found that the electron thermal confinement of the electron-ITB plasmas was clearly improved in the deuterium case. The GKV simulation showed the linear growth rate of TEM/ITG reduced in the plasmas with D both for the ion ITB and the electron ITB plasmas and qualitatively agreed with the tendency of the change in the thermal diffusivity obtained from the power balance analysis.

【 授权许可】

Unknown