Study of instability driving inward particle flux during the formation of transport barriers at the edge of the HL-2A tokamak

Nuclear Fushion

article

D.F. Kong¹  T. Lan²  A.D. Liu²  C.X. Yu²  H.L. Zhao¹  H.G. Shen²  L.W. Yan³  J.Q. Dong³  M. Xu³  K.J. Zhao³  J. Cheng³  X.R. Duan³  Y. Liu³  R. Chen¹  X. Sun²  J.L. Xie²  H. Li²  W.D. Liu²  The HL-2A Team³ 

[1] Institute of Plasma Physics, Chinese Academy of Sciences;CAS Key Laboratory of Geospace Environment, Department of Modern Physics, University of Science and Technology of China;Southwestern Institute of Physics

关键词: pedestal turbulence;    edge-localized mode;    particle flux;    Langmuir probe;    H mode;    zonal flow;   

DOI  :  10.1088/0029-5515/57/1/014005

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

An electrostatic coherent mode with a frequency of 20sim 100kHz can be observed during the formation of transport barriers in high-confinement-mode plasma in the HL-2A tokamak, using reciprocating Langmuir probes. The mode drives a strong inward particle flux measured directly with four-tip probes with values comparable to the particle flux at the striking point in the divertor, which has also been validated by the measurement of other diagnostics. Several characteristics simultaneously indicate that the mode is an ion mode excited at the edge, which plays an important role in the formation of transport barriers besides particle diffusion.

【 授权许可】

Unknown