Experimental evaluation of Langmuir probe sheath potential coefficient on the HL-2A tokamak
作者: L. NieM. XuR. KeB.D. YuanY.F. WuJ. ChengT. LanY. YuR.J. HongD. GuoL. TingY.B. DongY.P. ZhangX.M. SongW.L. ZhongZ.H. WangA.P. SunJ.Q. XuW. ChenL.W. YanX.L. ZouX.R. DuanHL-2A team
作者单位: 1Southwestern Institute of Physics, 610041 Chengdu, People’s Republic of China
2Department of Engineering Physics, Tsinghua University, 100084 Beijing, People’s Republic of China
3School of Nuclear Science and Technology, University of Science and Technology of China, 230026 Hefei, People’s Republic of China
4Key Laboratory of Basic Plasma Physics and Department of Modern Physics, University of Science and Technology of China, 230026 Hefei, People’s Republic of China
5Center for Momentum Transport and Flow Organization, University of California, San Diego, CA 92093, United States of America
6CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
刊名: Nuclear Fusion, 2018, Vol.58 (3)
来源数据库: Institute of Physics Journal
DOI: 10.1088/1741-4326/aaa4d1
原始语种摘要: Systematic calibration experiment of Langmuir probe sheath potential coefficient Λ, which is a critical coefficient for estimating plasma sheath potential, has been carried out in the HL-2A tokamak deuterium plasmas. The electron energy probability function (EEPF) shows that electron outside last-closed-flux-surface (LCFS) is Maxwell distribution, but inside LCFS it changes to bi-Maxwell. Two kinds of plasma potential measuring method and three kinds Λ estmating method were compared. It is found that the estimated Λ coefficient is in the region of 2–3 outside LCFS and then increases to ~5 inside LCFS due to the high temperature electron effect. Fortunately, the results show that the commonly used value Λ = 2.8 is still available to calculate plasma potential when we use the overestimated...
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  • potential 
  • sheath 
  • tokamak 托卡马克
  • probe 探针
  • coefficient 系数
  • electron 电子
  • outside 外边
  • Maxwell 麦克斯韦
  • corrected 校正的
  • plasma 深绿玉髓