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Measurement of the effective plasma ion mass in large tokamaks using global Alfven eigenmodes

机译：使用全局Alfven本征模式测量大型托卡马克中的有效等离子体离子质量

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There is not yet a straightforward method for determining the D-T ratio in the centre of a tokamak plasma. One of the simpler measurements put forward in the past is the interpretation of the MHD spectrum in the frequency range of the global Alfven eigenmodes (GAE). However, the frequencies of these modes do not depend on the plasma mass alone, but are also quite strongly dependent on the details of the current and density profiles; this creates a problem of deconvolution of the estimate of the plasma mass from an implicit relationship between several measurable plasma parameters and the detected eigenmode frequencies; In view of the lack of competitive diagnostics, this method has been revisited to assess its likely precision for the JET tokamak. Our results show that the low-n GAE modes are sometimes too close to the continuum edge to be detectable and that the interpretation of the GAE spectrum is therefore rendered less direct than had been hoped. However, information on the effective plasma ion mass is still available in the detectable modes and we present a statistical study on the precision with which this quantity could be estimated from the GAE spectrum on JET, including other directly measured or simply available plasma parameters. [References: 12]
机译：在托卡马克等离子体中心还没有一种直接的方法来确定D-T比。过去提出的一种更简单的测量方法是对全球Alfven本征模式（GAE）频率范围内的MHD频谱进行解释。然而，这些模式的频率不仅仅取决于等离子体质量，还非常强烈地取决于电流和密度分布的细节。这从几个可测量的等离子体参数与检测到的本征模频率之间的隐式关系中产生了等离子体质量估计值的反卷积问题;由于缺乏竞争性诊断方法，因此对该方法进行了重新评估，以评估其对JET托卡马克的精度。我们的结果表明，低n GAE模式有时过于接近连续边缘而无法检测到，因此GAE频谱的解释不如所希望的那样直接。然而，关于有效等离子体离子质量的信息仍然可以在可检测的模式下获得，并且我们提供了关于可以从JET上的GAE谱估计该量的精度的统计研究，包括其他直接测量的或简单可获得的等离子体参数。 [参考：12]

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