Enhanced current drive efficiency in a long discharge on TRIAM-1M

K. Hanada, S. Itoh, K. Nakamura, H. Zushi, M. Sakamoto, E. Jotaki, Y. D. Pan, M. Hasegawa, S. Kawasaki, H. Nakashima

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Abstract

The enhanced current drive (ECD) efficiency mode, which is characterized by a spontaneous increase of current drive efficiency ηCD from (0.3-0.4) × 1019 A/W m-2 to (0.6-1.0) × 1019 A/W m-2, is observed in long pure LHCD plasmas on TRIAM-1M. The energy confinement time is also improved due to the increase of line averaged electron density, and of the ion and electron temperatures. The current drive efficiency is proportional to the electron density. The transition to ECD mode occurs at a critical density, which depends slightly on the refractive index in the toroidal direction N of the injected wave.

Original languageEnglish
Pages (from-to)1539-1542
Number of pages4
JournalNuclear Fusion
Volume41
Issue number11
DOIs
Publication statusPublished - Nov 1 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Hanada, K., Itoh, S., Nakamura, K., Zushi, H., Sakamoto, M., Jotaki, E., Pan, Y. D., Hasegawa, M., Kawasaki, S., & Nakashima, H. (2001). Enhanced current drive efficiency in a long discharge on TRIAM-1M. Nuclear Fusion, 41(11), 1539-1542. https://doi.org/10.1088/0029-5515/41/11/302