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Turbulence simulations of transport barrier relaxations in tokamak edge plasmas

机译：托卡马克边缘等离子体中运输壁垒弛豫的湍流模拟

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摘要

A promising operational regime of future fusion reactors is characterized by an edge transport barrier, i.e. a localized steepening of density and temperature gradients. Typically, such a barrier is unstable and relaxes quasi-periodically. In this work, we show that complete barrier relaxation cycles can be reproduced by three-dimensional turbulence simulations. In these simulations, a barrier forms due to an imposed E x B shear flow. This barrier relaxes intermittently on the confinement time scale, even if fluctuations of the E x B flow are suppressed. It is found here that if the E x B shear increases faster than linearly with heating power, the relaxation frequency decreases with power. A relaxation event has a complex dynamical behaviour, characterized by the intermittent growth of a mode at the barrier centre. A crucial ingredient in this non-linear dynamics is a time delay for an effective E x B velocity shear stabilization.
机译：未来聚变反应堆的有前途的运行方式的特征在于边缘传输障碍，即密度和温度梯度的局部变陡。通常，这种屏障是不稳定的并且准周期性地松弛。在这项工作中，我们表明可以通过三维湍流模拟来再现完整的屏障松弛循环。在这些模拟中，由于施加的E x B剪切流，形成了屏障。即使抑制了E x B流量的波动，此屏障也会在限制时间范围内间歇性地放松。在这里发现，如果E x B剪切随加热功率线性增加快，则弛豫频率随加热功率减小。放松事件具有复杂的动力学行为，其特征在于屏障中心处的模式间歇性增长。这种非线性动力学的关键因素是有效E x B速度剪切稳定的时间延迟。

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