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首页> 外文期刊>Plasma physics and controlled fusion >Collisionality scaling of the electron heat flux in ETG turbulence
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Collisionality scaling of the electron heat flux in ETG turbulence

机译：ETG湍流中电子热通量的碰撞性缩放

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摘要

In electrostatic simulations of MAST plasma at electron-gyroradius scales, using the local fluxtube gyrokinetic code GS2 with adiabatic ions, we find that the long-time saturated electron heat flux (the level most relevant to energy transport) decreases as the electron collisionality decreases. At early simulation times, the heat flux 'quasi-saturates' without any strong dependence on collisionality, and with the turbulence dominated by streamer-like radially elongated structures. However, the zonal fluctuation component continues to grow slowly until much later times, eventually leading to a new saturated state dominated by zonal modes and with the heat flux proportional to the collision rate, in approximate agreement with the experimentally observed collisionality scaling of the energy confinement in MAST. We outline an explanation of this effect based on a model of ETG turbulence dominated by zonal-nonzonal interactions and on an analytically derived scaling of the zonal-mode damping rate with the electron-ion collisionality. Improved energy confinement with decreasing collisionality is favourable towards the performance of future, hotter devices.
机译：在电子-Gyroradius秤上的桅杆等离子体的静电模拟中，使用局部荧光素旋转码GS2与绝热离子，我们发现随着电子碰撞性的降低，长时间饱和的电子热量（与能量传输最相关的水平）降低。在早期模拟时间，热通量的“准饱和”没有任何强烈依赖性的依赖性，并且湍流由飘逸的径向细长结构支配。然而，区域波动分量继续缓慢生长，直到稍后的时间，最终导致由区域模式主导的新的饱和状态，并且随着碰撞率成比例的热量，与实验观察到的能量限制的临时削减达成协议在帆柱。我们概述了基于由Zonal-Nondonal相互作用主导的ETG湍流模型的这种效果的解释，以及在具有电子离子接收性的区域模式阻尼速率的分析级测定中。利用降低的罚性提高能源限制是有利的，朝着未来的效果更热的设备。

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