Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma

Kaijun Zhao, Yoshihiko Nagashima, Zhibin Guo, Patrick H. Diamond, Jiaqi Dong, Longwen Yan, Kimitaka Itoh, Sanae I. Itoh, Xiaobo Li, Jiquan Li, Akihide Fujisawa, Inagaki Shigeru, Jun Cheng, Jianqiang Xu, Yusuke Kosuga, Makoto Sasaki, Zhengxiong Wang, Huaiqiang Zhang, Yuqian Chen, Xiaogang CaoDeliang Yu, Yi Liu, Xianming Song, Fan Xia, Shuo Wang

Research output: Contribution to journalArticlepeer-review

Abstract

Enhancements of edge zonal flows, radial electric fields, and turbulence are observed in electron cyclotron resonance heating-heated plasmas (Zhao et al 2013 Nucl. Fusion 53 083011). In this paper, the effects of sawtooth heat pulses on flows and turbulence are presented. These experiments are performed using multiple Langmuir probe arrays in the edge plasmas of the HL-2A tokamak. The edge zonal flows, radial electric fields, and turbulence are all enhanced by sawteeth. Propagation of the zonal flow and turbulence intensities is also observed. The delay time of the maximal intensity of the electric fields, zonal flows, and turbulence with respect to the sawtooth crashes is estimated as ∼1 ms and comparable to that of the sawtooth-triggered intermediate phases. Not only the zonal flows but also the radial electric fields lag behind the turbulence. Furthermore, the intensities of both the zonal flows and electric fields nearly linearly increase/decrease with the increase/decrease of the turbulence intensity. A double-source predator-prey model analysis suggests that a relatively strong turbulence source may contribute to the dominant zonal flow formation during sawtooth cycles.

Original languageEnglish
Article number015101
JournalPlasma Science and Technology
Volume25
Issue number1
DOIs
Publication statusPublished - Jan 1 2022

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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