Non-inductive plasma current start-up by EC and RF power in the TST-2 spherical tokamak

A. Ejiri, Y. Takase, T. Oosako, T. Yamaguchi, Y. Adachi, O. Watanabe, Y. Nagashima, B. I. An, H. Kobayashi, H. Kurashina, H. Hayashi, H. Matsuzawa, K. Yamada, H. Tojo, T. Masuda, M. Sasaki, R. Kumazawa, H. Kasahara, F. Shimpo

研究成果: ジャーナルへの寄稿記事

25 引用 (Scopus)

抜粋

Non-inductive plasma current start-up by EC and RF power was carried out on the TST-2 device. Low frequency RF (21 MHz) sustainment was demonstrated, and the obtained high βp spherical tokamak configuration has similar equilibrium values as the EC (2.45 GHz) sustained plasma. Equilibrium analysis revealed detailed information on three discharge phases: (i) in the initial current formation phase, the plasma current increases with the stored energy, and the current is in the same order as that predicted by theory. (ii) In the current jump phase, the current density profile, which is peaked near the outboard boundary, is not deformed but increases slowly and the initial closed flux surface appears when the current reaches a maximum. (iii) In the current sustained phase, equilibrium is characterized by the hollowness of the current density profile, and it determines the fraction of the current inside the last closed flux surface to the total current. Both EC and RF injections show a similar equilibrium. While MHD instabilities often terminate the RF sustained plasma, no such phenomenon was observed in the EC sustained plasma.

元の言語英語
記事番号065010
ジャーナルNuclear Fusion
49
発行部数6
DOI
出版物ステータス出版済み - 7 2 2009
外部発表Yes

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

これを引用

Ejiri, A., Takase, Y., Oosako, T., Yamaguchi, T., Adachi, Y., Watanabe, O., ... Shimpo, F. (2009). Non-inductive plasma current start-up by EC and RF power in the TST-2 spherical tokamak. Nuclear Fusion, 49(6), [065010]. https://doi.org/10.1088/0029-5515/49/6/065010