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Chinese Physics, 2007, Vol. 16(4): 1084-1088    DOI: 10.1088/1009-1963/16/4/037
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Measurement and analyses of the mean effective ion charge in the centre of tokamak discharges

Zheng Yong-Zhen(郑永真), Ding Xuan-Tong(丁玄同), and Zhuo Yan(周艳)
Southwestern Institute of Physics, Chengdu 610041, China
Abstract  There are two different definitions for specifying the mean effective ion charge Zeff in plasmas: a) from the Spizer electrical resistivity of the plasma and b) from bremsstrahlung radiation losses of the plasma. In this paper Zeff in the centre of tokamak ohmic discharges has been determined from information on sawtooth-relaxations of the steady state plasma, based on the analysis for the power balance of the plasma electrons in the plasma centre during the period of recovery after the sawtooth crashes. This method is found to supply reliable results for tokamak parameters. While its application requires some efforts in data analysis, it can provide a reliable determination of Zeff, independent of the information from bremsstrahlung radiation losses of the plasma.
Keywords:  mean effective ion charge      sawtooth relaxation      power balance of plasma electrons  
Received:  14 August 2006      Revised:  30 August 2006      Accepted manuscript online: 
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.25.Fi (Transport properties)  
  52.80.-s (Electric discharges)  
Fund: Project supported by the Nuclear Science Foundation (Grant No1997517).

Cite this article: 

Zheng Yong-Zhen(郑永真), Ding Xuan-Tong(丁玄同), and Zhuo Yan(周艳) Measurement and analyses of the mean effective ion charge in the centre of tokamak discharges 2007 Chinese Physics 16 1084

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