TY - JOUR
T1 - Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma
AU - Zhao, Kaijun
AU - Nagashima, Yoshihiko
AU - Guo, Zhibin
AU - Diamond, Patrick H.
AU - Dong, Jiaqi
AU - Yan, Longwen
AU - Itoh, Kimitaka
AU - Itoh, Sanae I.
AU - Li, Xiaobo
AU - Li, Jiquan
AU - Fujisawa, Akihide
AU - Shigeru, Inagaki
AU - Cheng, Jun
AU - Xu, Jianqiang
AU - Kosuga, Yusuke
AU - Sasaki, Makoto
AU - Wang, Zhengxiong
AU - Zhang, Huaiqiang
AU - Chen, Yuqian
AU - Cao, Xiaogang
AU - Yu, Deliang
AU - Liu, Yi
AU - Song, Xianming
AU - Xia, Fan
AU - Wang, Shuo
N1 - Funding Information:
This work was supported by National Natural Science Foundation of China (Nos. 12075057, 11775069, 11320101005, and 11875020); the National Magnetic Confinement Fusion Science Program of China (No. 2017YFE0301201); East China University of Technology, Doctoral Foundation (Nos. DHBK2017134 and DHBK 2018059); Grant-in-Aid for Scientific Research of the Japan Society for the Promotion of Science (Nos. 15H02155, 15H02335, 21K03513); Landmark Achievements in Nuclear Science and Technology (No. xxkjs2018011); and Natural Science Foundation of Jiangxi Province (Nos. 20202ACBL201002 and 0192ACB80006).
Publisher Copyright:
© 2022 Hefei Institutes of Physical Science, Chinese Academy of Sciences and IOP Publishing.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - 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.
AB - 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.
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U2 - 10.1088/2058-6272/ac7c60
DO - 10.1088/2058-6272/ac7c60
M3 - Article
AN - SCOPUS:85141933805
SN - 1009-0630
VL - 25
JO - Plasma Science and Technology
JF - Plasma Science and Technology
IS - 1
M1 - 015101
ER -