Dynamics of low-intermediate-high-confinement transitions in toroidal plasmas

J. Cheng, J. Q. Dong, K. Itoh, L. W. Yan, M. Xu, K. J. Zhao, W. Y. Hong, Z. H. Huang, X. Q. Ji, W. L. Zhong, D. L. Yu, S. I. Itoh, L. Nie, D. F. Kong, T. Lan, A. D. Liu, X. L. Zou, Q. W. Yang, X. T. Ding, X. R. DuanYong Liu

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Abstract

The dynamic features of the low-intermediate-high-(L-I-H) confinement transitions on HL-2A tokamak are presented. Here we report the discovery of two types of limit cycles (dubbed type-Y and type-J), which show opposite temporal ordering between the radial electric field and turbulence intensity. In type-Y, which appears first after an L-I transition, the turbulence grows first, followed by the localized electric field. In contrast, the electric field leads type-J. The turbulence-induced zonal flow and pressure-gradient-induced drift play essential roles in the two types of limit cycles, respectively. The condition of transition between types-Y and -J is studied in terms of the normalized radial electric field. An I-H transition is demonstrated to occur only from type-J.

Original languageEnglish
Article number265002
JournalPhysical Review Letters
Volume110
Issue number26
DOIs
Publication statusPublished - Jun 25 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Cheng, J., Dong, J. Q., Itoh, K., Yan, L. W., Xu, M., Zhao, K. J., Hong, W. Y., Huang, Z. H., Ji, X. Q., Zhong, W. L., Yu, D. L., Itoh, S. I., Nie, L., Kong, D. F., Lan, T., Liu, A. D., Zou, X. L., Yang, Q. W., Ding, X. T., ... Liu, Y. (2013). Dynamics of low-intermediate-high-confinement transitions in toroidal plasmas. Physical Review Letters, 110(26), [265002]. https://doi.org/10.1103/PhysRevLett.110.265002