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首页> 外文期刊>Plasma physics and controlled fusion >Characterization of impurities in L- and H-modes created by divertor biasing and plasma triangularity in TdeV
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Characterization of impurities in L- and H-modes created by divertor biasing and plasma triangularity in TdeV

机译：由TdeV中的偏滤器偏置和等离子体三角性产生的L模式和H模式杂质的表征

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摘要

A characterization of the H-mode in Tokamak de Varennes (TdeV) is presented, combining results obtained from spectroscopic measurements with observations of global plasma parameters. Controlled L- and H-modes are obtained by applying an external bias on the divertor plate and/or by varying the plasma triangularity using similar steady-state discharges with electron cyclotron resonance heating (ECRH). A qualitative study of the impurity emission asymmetries is presented and discussed by proposing a simple model which considers that the emissivity has radial and poloidal components. The poloidal velocities are small with no significant variations with respect to the plate biasing, EC power and plasma triangularity. Toroidal. rotation velocities show more consistent trends and have larger values in the H-modes with respect to the L-modes. No significant shear in the radial electric field is observed between the H- and L-modes. Differences in the electric field and in the E x B shear are observed for several discharges, but they are not consistent overall. A study on the impurity transport shows low diffusivity values in the plasma centre and high values in the edge during the H-mode. The energy confinement time decreases with the severity of the edge localized modes and, consequently, with the neutral fluxes. The presence of a toroidal torque which affects the particle transport inside the plasma plays an important role in the TdeV H-modes. [References: 37]
机译：给出了托卡马克德瓦雷纳斯（TdeV）中H模式的表征，将光谱测量获得的结果与整体血浆参数的观察结果相结合。通过在偏滤板上施加外部偏压和/或通过使用类似的稳态放电和电子回旋共振加热（ECRH）来改变等离子体三角形性，可以获得受控的L模式和H模式。通过提出一个简单的模型来对杂质发射不对称性进行定性研究，并进行讨论，该模型考虑了发射率具有径向和极向分量。极向速度很小，相对于板偏压，EC功率和等离子三角形性没有明显变化。环形的。旋转速度显示出更一致的趋势，并且在H模式下相对于L模式具有更大的值。在H模式和L模式之间，没有观察到径向电场中的明显剪切。对于几次放电，观察到电场和E x B剪切的差异，但总体上不一致。对杂质传输的研究表明，在H模式下，等离子体中心的扩散系数较低，而边缘的扩散系数较高。能量约束时间随着边缘局部模式的严重性而减少，因此随着中性通量的减少。环形转矩的存在会影响等离子体在内部的传输，在TdeV H模式下起着重要作用。 [参考：37]

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