Low-intermediate-high confinement transition in HL-2A tokamak plasmas

J. Cheng, J. Q. Dong, K. Itoh, L. W. Yan, W. Y. Hong, K. J. Zhao, Z. H. Huang, X. Q. Ji, W. L. Zhong, D. L. Yu, S. I. Itoh, L. Nie, X. M. Song, Q. W. Yang, X. T. Ding, X. L. Zou, X. R. Duan, Yong Liu

研究成果: Contribution to journalArticle査読

21 被引用数 (Scopus)

抄録

The dynamics of low-intermediate-high confinement transitions was studied using a four-step Langmuir probe in the HL-2A edge plasma. Two types (dubbed type-Y and type-J) of limit cycle oscillations (LCOs) with opposite temporal ordering between the radial electric field and turbulence were first observed. In type-Y, the turbulence grows first, followed by the localized electric field. In contrast, the electric field leads turbulence in type-J. In addition, the Reynolds stress gradient is found not enough to drive the LCO flow and the three-wave nonlinear coupling is weak there. The continuously increasing amplitude of magnetic fluctuations and the significant correlation between the magnetic fluctuation and the electron pressure gradient indicate an important role of diamagnetic drifts in the L-H transition. Mode numbers of magnetic fluctuations in the LCO frequency are identified to be m/n=1/0.

本文言語英語
論文番号114004
ジャーナルNuclear Fusion
54
11
DOI
出版ステータス出版済み - 11 1 2014

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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