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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >The 'churning mode' of plasma convection in the tokamak divertor region
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The 'churning mode' of plasma convection in the tokamak divertor region

机译：托卡马克分流器区域中等离子对流的“激发模式”

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摘要

The churning mode can arise in a toroidally-symmetric plasma where it causes convection in the vicinity of the poloidal magnetic field null. The mode is driven by the toroidal curvature of magnetic field lines coupled with a pressure gradient. The toroidal equilibrium conditions cannot be satisfied easily in the virtual absence of the poloidal field (PF)--hence the onset of this mode, which 'churns' the plasma around the PF null without perturbing the strong toroidal field. We find the conditions under which this mode can be excited in magnetic configurations with first-, second-, and third-order PF nulls (i.e., in the geometry of standard, snowflake and cloverleaf divertors). The size of the affected zone in second- and third-order-null divertors is much larger than in a standard first-order-null divertor. The proposed phenomenological theory allows one to evaluate observable characteristics of the mode, in particular the frequency and amplitude of the PF perturbations. The mode spreads the tokamak heat exhaust between multiple divertor legs and may lead to a broadening of the plasma width in each leg. The mode causes much more intense plasma convection in the poloidal plane than the classical plasma drifts.
机译：搅动模式可以出现在环形对称的等离子体中，在等离子体场零附近，它引起对流。该模式由磁场线的环形曲率和压力梯度共同驱动。在几乎没有极场（PF）的情况下，无法轻松满足环形平衡条件-因此，此模式的开始，即在不干扰强环形场的情况下“搅动” PF周围的等离子体。我们发现在具有一阶，二阶和三阶PF零点的磁性配置中（即在标准，雪花和苜蓿叶形偏向器的几何形状中）可以激发此模式的条件。二阶和三阶零偏滤器中受影响区域的大小比标准的一阶零零偏滤器大得多。提出的现象学理论允许人们评估该模式的可观察特征，特别是PF扰动的频率和幅度。该模式将托卡马克排热散布在多个分流器支路之间，并且可能导致每个支路中的等离子体宽度变宽。与经典等离子漂移相比，该模式在极向平面上引起更强烈的等离子对流。

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