中国物理B ›› 2007, Vol. 16 ›› Issue (4): 1084-1088.doi: 10.1088/1009-1963/16/4/037

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

郑永真, 丁玄同, 周 艳   

  1. Southwestern Institute of Physics, Chengdu 610041 China
  • 收稿日期:2006-08-14 修回日期:2006-08-30 出版日期:2007-04-20 发布日期:2007-04-20
  • 基金资助:
    Project supported by the Nuclear Science Foundation (Grant No1997517).

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)   

  1. Southwestern Institute of Physics, Chengdu 610041, China
  • Received:2006-08-14 Revised:2006-08-30 Online:2007-04-20 Published:2007-04-20
  • Supported by:
    Project supported by the Nuclear Science Foundation (Grant No1997517).

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摘要： 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.

关键词: mean effective ion charge, sawtooth relaxation, power balance of plasma electrons

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.

Key words: mean effective ion charge, sawtooth relaxation, power balance of plasma electrons

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.25.Fi (Transport properties) 52.80.-s (Electric discharges)