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The effect of non-inductive current drive on tokamak transport

机译：无感电流驱动对托卡马克传输的影响

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Non-inductive current drive causes cross-field neoclassical transport in a tokamak, in much the same way that the toroidal electric field used to drive the plasma current produces the so-called Ware pinch. This transport can be either inwards or outwards, depending on the current drive mechanism, and can be either larger or smaller than the analogous Ware pinch. A Green's function formalism is used to calculate the transport produced by wave-driven currents, which is found to be inwards for electron-cyclotron and lower-hybrid current drive. Its magnitude is proportional to the collisionality of the current-carrying electrons and therefore smaller than the Ware pinch when the resonant electrons are suprathermal. In contrast, neutral-beam current drive produces outward particle transport when the beams are injected in the same toroidal direction as the plasma current, and inward particle transport otherwise. This transport is somewhat larger than the corresponding Ware pinch. Together, they may explain an observation made on several tokamaks over the years, most recently on MAST, that density profiles tend to be more peaked during counter-injection.
机译：非感应电流驱动会在托卡马克中引起跨场新古典运输，其方式与用于驱动等离子电流的环形电场会产生所谓的Ware收缩。取决于当前的驱动机制，此传输可以向内或向外，并且可以大于或小于类似的Ware夹点。使用格林函数形式主义来计算由波驱动电流产生的传输，这对于电子回旋加速器和低杂化电流驱动是向内的。它的大小与载流电子的碰撞性成正比，因此，当共振电子为超热状态时，其幅度小于Ware收缩。相反，当光束以与等离子体电流相同的环形方向注入时，中性束电流驱动产生向外的粒子传输，否则向内传输粒子。此传输量比相应的Ware夹点要大一些。他们在一起可以解释多年来对几台托卡马克所做的观察，最近一次是在MAST上进行的，观察到密度分布在反注射过程中趋于更加高峰。

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