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Plasma Potential in Toroidal Devices: T-10, TJ-II, CHS and LHD

机译:环形装置中的血浆电势:T-10,TJ-II,CHS和LHD

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Direct measurements of the electric potential φ , using the Heavy Ion Beam Probing, have been undertaken in the T-10 tokamak, and in the helical devices with various magnetic topology: TJ-II, CHS and LHD. L-mode plasmas were considered. Despite the large differences in machine sizes, heating methods and the topology of the magnetic field, the observed φ shows the striking similarities: (i) Similar magnitudes of E r; (ii) For low densities, n e 19 m?3, φ is positive, and an increase in n e is associated with the decrease of positive φ and formation of a negative E r; (iii) For higher densities, n e r tends to be negative despite the use of different heating methods: Ohmic and ECR heating in T-10, ECRH and/or NBI in TJ-II, CHS and LHD; (iv) Application of ECRH, causing a rise in T e, results in more positive values for φ and E r. The analysis show that the main features of the φ dependences on the n e and T e agree with neoclassical predictions on the four devices within experimental and simulation precisions.
机译:在T-10托卡马克以及具有各种磁拓扑的TJ-II,CHS和LHD的螺旋装置中,已经使用重离子束探测技术直接测量了电势φ。考虑了L模式等离子体。尽管机器尺寸,加热方法和磁场拓扑存在很大差异,但观察到的φ表现出惊人的相似性:(i)E r 的大小相似; (ii)对于低密度,n e 19 m ?3 ,φ为正,n e 的增加为与正φ的减小和负E r 的形成有关; (iii)对于更高的密度,n e m ?3 ,φ和E 尽管使用不同的加热方法,r仍为负值:T-10中的欧姆和ECR加热,TJ-II,CHS和LHD中的ECRH和/或NBI; (iv)ECRH的应用导致T ​​ e 的升高,导致φ和E r 的正值更大。分析表明,φ依赖于n e 和T e 的主要特征与在实验和仿真精度范围内对这四种设备的新古典预测相吻合。

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