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Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma
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作者 赵开君 Yoshihiko NAGASHIMA +22 位作者 郭志彬 Patrick H DIAMOND 董家齐 严龙文 kimitaka itoh Sanae-I itoh 李晓博 李继全 Akihide FUJISAWA Shigeru INAGAKI 程钧 许健强 Yusuke KOSUGA Makoto SASAKI 王正汹 张怀强 陈俞钱 曹小岗 余德良 刘仪 宋显明 夏凡 王硕 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第1期1-9,共9页
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 53083011).In this paper,the effects of sawtooth he... 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 53083011).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. 展开更多
关键词 TOKAMAK Langmuir probe arrays edge flows and turbulence sawtooth heat pulses
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Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak 被引量:1
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作者 Yaoyu Xie Kaijun Zhao +15 位作者 Zhipeng Chen Jiaqi Dong kimitaka itoh Zhongyong Chen Yuejiang Shi Yonghua Ding Jun Cheng Longwen Yan Hai Liu Zhifeng Cheng Zhoujun Yang Nengchao Wang Lu Wang Jianqiang Xu Yunfeng Liang J-TEXT Team 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第10期112-119,共8页
The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first demonstrated.Multiple Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study.A significant peak at... The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first demonstrated.Multiple Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study.A significant peak at the GAM frequency is observed in Mach number fluctuations.The toroidal velocity for the GAMs is estimated as 10–100 ms-1 and increases with the poloidal velocity.The ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and 1.0.With higher safety factors q,the ratio almost does not change with decreasing the safety factor,whereas it goes up sharply at low q.The coherencies between poloidal electric fields and Mach number fluctuations in turbulence frequency bands are also evaluated,and are higher than those between radial electric fields and Mach number fluctuations. 展开更多
关键词 zonal flow geodesic acoustic mode TOKAMAK return flow Mach number
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Heavy Ion Beam Probe Measurement in Turbulence Diagnostic Simulator
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作者 Naohiro KASUYA Seiya NISHIMURA +2 位作者 Masatoshi YAGI kimitaka itoh Sanae-I itoh 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第3期326-331,共6页
A numerical measurement module simulating a heavy ion beam probe was developed, and numerical measurements of electrostatic potential and density fluctuations are carried out for 3-D turbulent data generated by a glob... A numerical measurement module simulating a heavy ion beam probe was developed, and numerical measurements of electrostatic potential and density fluctuations are carried out for 3-D turbulent data generated by a global simulation of drift-interchange mode turbulence in helical plasmas. The deviation between measured and local values is estimated. It is found that the characteristic structures can be detected in spite of the screening effect due to the finite spatial resolution. 展开更多
关键词 TURBULENCE structural formation numerical simulation heavy ion beamprobe FLUCTUATION spatial resolution
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