Measurement and analyses of the mean effective ion charge in the centre of tokamak discharges |
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Authors: | Zheng Yong-Zhen Ding Xuan-Tong and Zhuo Yan |
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Institution: | Southwestern Institute of Physics, Chengdu 610041, China |
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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. |
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Keywords: | mean effective ion charge sawtooth relaxation power
balance of plasma electrons |
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