Author:
ZHAO Kaijun,NAGASHIMA Yoshihiko,GUO Zhibin,DIAMOND Patrick H,DONG Jiaqi,YAN Longwen,ITOH Kimitaka,ITOH Sanae-I,LI Xiaobo,LI Jiquan,FUJISAWA Akihide,INAGAKI Shigeru,CHENG Jun,XU Jianqiang,KOSUGA Yusuke,SASAKI Makoto,WANG Zhengxiong,ZHANG Huaiqiang,CHEN Yuqian,CAO Xiaogang,YU Deliang,LIU Yi,SONG Xianming,XIA Fan,WANG Shuo
Abstract
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.
Funder
Landmark Achievements in Nuclear Science and Technology
East China University of Technology, Doctoral Foundation
Grant-in-Aid for Scientific Research of JSPS
Natural Science Foundation of Jiangxi Province
National Magnetic Confinement Fusion Program of China
National Natural Science Foundation of China
Cited by
1 articles.
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