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Electron energy distribution function, plasma potential and electron density measured by Langmuir probe in tokamak edge plasma

机译:用朗缪尔探针在托卡马克边缘等离子体中测量电子能量分布函数,等离子体电势和电子密度

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摘要

The electron energy distribution function (EEDF) at different radial positions is derived from Langmuir probe measurements in the CASTOR tokamak edge plasma using the first derivative method. It is shown that the EEDFs are not Maxwellian but can be approximated as bi-Maxwellians with one dominant, low temperature electron population and one minority composed of hotter electrons. In the limiter shadow the measured EEDFs are Maxwellian. The values of the plasma potential and electron densities at different radial positions are also evaluated. The results presented in this paper demonstrate that the first derivative method allows one to acquire additional plasma parameters using the electron part of the current-voltage characteristics in strongly magnetized tokamak edge plasmas.
机译:使用一阶导数方法,从CASTOR托卡马克边缘等离子体中的Langmuir探针测量值得出不同径向位置的电子能量分布函数(EEDF)。结果表明,EEDF不是麦克斯韦,而是可以近似为具有一个主要的低温电子种群和一个由较热的电子组成的少数的双麦克斯韦。在限制器阴影中,测得的EEDF为Maxwellian。还评估了在不同径向位置的等离子体电势和电子密度的值。本文介绍的结果表明,一阶导数方法允许使用强磁托卡马克边缘等离子体中电流-电压特性的电子部分来获取其他等离子体参数。

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