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Multi-machine comparison of drift fluid dimensionless parameters

机译：漂移液无量纲参数的多机比较

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摘要

The behaviour of the turbulence in magnetic fusion plasmas is discussed in the framework of dimensional analysis. Three main dimensionless parameters are identified, which directly affect the adiabatic response of the plasma and hence control the electron response. They were originally introduced by Scott (1997 Plasma Phys. Control. Fusion 39 1635) and Rogers and Drake (1997 Phys. Rev. Lett. 79 229), and represent the effect of the electromagnetic induction, collisions and electron inertia. The dimensionless parameters are then evaluated at different radial positions in four existing divertor machines (ALCATOR C-MOD, ASDEX-Upgrade, JET and MAST) and in three future experiments (MAST-Upgrade, ITER and DEMO). Clear multi-machine trends, suggesting a quasi-universal behaviour of the plasma, are identified and discussed. Exploiting this quasi-universality, useful insight into the physics of the machines is obtained without complex calculations or expensive numerical simulations. In particular, the trends show a clear separation of the plasma in four distinct regions: core, edge, scrape-off layer and divertor, each of them characterized by a different set of parameters which, in turn, lead to significant variation of the dominant physical mechanisms across the machine.
机译：在尺寸分析的框架内讨论了磁聚变等离子体中湍流的行为。确定了三个主要的无量纲参数，它们直接影响等离子体的绝热响应并因此控制电子响应。它们最初是由Scott（1997等离子物理控制。Fusion 39 1635）和Rogers和Drake（1997 Phys。Rev. Lett。79 229）引入的，代表了电磁感应，碰撞和电子惯性的作用。然后，在四个现有的偏滤器机器（ALCATOR C-MOD，ASDEX-Upgrade，JET和MAST）和未来的三个实验（MAST-Upgrade，ITER和DEMO）中，在不同的径向位置评估无因次参数。确定并讨论了明确的多机趋势，表明等离子体的准通用行为。利用这种准通用性，无需复杂的计算或昂贵的数值模拟即可获得对机械物理的有用见解。特别是，趋势显示等离子体在四个不同区域（芯，边缘，刮除层和偏滤器）中的清晰分离，每个区域的特征在于一组不同的参数，这些参数继而导致主导区域的显着变化机器上的物理机制。

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