Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD

H. Takahashi, M. Osakabe, K. Nagaoka, S. Murakami, I. Yamada, Y. Takeiri, M. Yokoyama, H. Lee, K. Ida, R. Seki, C. Suzuki, M. Yoshinuma, T. Ido, A. Shimizu, M. Goto, S. Morita, T. Shimozuma, S. Kubo, S. Satake, S. MatsuokaN. Tamura, H. Tsuchiya, K. Tanaka, M. Nunami, A. Wakasa, K. Tsumori, K. Ikeda, H. Nakano, M. Kisaki, Y. Yoshimura, M. Nishiura, H. Igami, T. Seki, H. Kasahara, K. Saito, R. Kumazawa, S. Muto, K. Narihara, T. Mutoh, O. Kaneko, H. Yamada

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Abstract

A central ion temperature of 7 keV in a neutral beam injection (NBI)-heated plasma and a central-electron temperature of 20 keV in an electron cyclotron resonance heating plasma were achieved in the Large Helical Device (LHD) using an upgraded heating system with a newly installed perpendicular-NB injector and gyrotrons. The values of Ti and Te significantly exceeded 5.6 and 15 keV, obtained in previous experiments, respectively. High-T i plasma was obtained using a carbon pellet injection and the kinetic-energy confinement improved by a factor of 1.5. Transport analysis of the high-Ti plasmas showed that the ion-thermal diffusivity and the viscosity were reduced after the pellet injection. Dynamic-transport analysis is applied and the transition to the ion-internal-transport barrier and back transition are discussed.

Original languageEnglish
Article number073034
JournalNuclear Fusion
Volume53
Issue number7
DOIs
Publication statusPublished - Jul 1 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Takahashi, H., Osakabe, M., Nagaoka, K., Murakami, S., Yamada, I., Takeiri, Y., Yokoyama, M., Lee, H., Ida, K., Seki, R., Suzuki, C., Yoshinuma, M., Ido, T., Shimizu, A., Goto, M., Morita, S., Shimozuma, T., Kubo, S., Satake, S., ... Yamada, H. (2013). Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD. Nuclear Fusion, 53(7), [073034]. https://doi.org/10.1088/0029-5515/53/7/073034