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Dynamics of heavy impurities in non-linear MHD simulations of sawtoothing tokamak plasmas

机译:锯齿托卡马克等离子体的非线性MHD模拟中的重杂质动力学

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摘要

The effect of sawteeth on impurity dynamics is studied with the XTOR-2F code. Non-linear full 3D MHD simulations including appropriate fluid equations for impurities in the high collisional regime show that the presence of regular sawtooth crashes affects the impurity behaviour. A spatial non-uniformity of 5% in post-crash impurity density profiles persists due to 2D structures of impurity density which appear during sawtooth crashes. They are shown to be mainly driven by the E x B velocity, and are responsible for the sudden impurity transport in the core plasmas.
机译:使用XTOR-2F代码研究了锯齿对杂质动力学的影响。非线性全3D MHD仿真(包括在高碰撞状态下杂质的适当流体方程)表明,规则锯齿形碰撞的存在会影响杂质行为。由于锯齿形碰撞期间出现的杂质密度的二维结构,碰撞后杂质密度分布中的空间不均匀性持续存在5%。它们显示出主要由E x B速度驱动,并导致核心等离子体中突然的杂质传输。

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