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首页> 外文期刊>Nuclear fusion >Seeding of neoclassical tearing modes by internal crash events in the ASDEX Upgrade and DIII-D tokamaks
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Seeding of neoclassical tearing modes by internal crash events in the ASDEX Upgrade and DIII-D tokamaks

机译：在ASDEX升级和DIII-D Tokamak中的内部碰撞事件播种新古典撕裂模式

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摘要

Seeding of neoclassical tearing modes (NTMs) by perturbations from other MHD instabilities (sawteeth, fishbones, ELMs, etc) is one of the main MHD problems which has to be avoided or controlled in ITER. NTMs can lead to strong degradation of plasma confinement or even to a disruption. This paper compares the seeding of (3,2) NTMs in DIII-D and ASDEX Upgrade tokamaks. It was found in both devices that a mode can start as an ideal kink mode that converts into a tearing mode on a time-scale much longer (similar to 10(-2)) than the duration of the trigger event (similar to 10(-4)). These findings are in good agreement with those for (2,1) mode seeding in ASDEX Upgrade as well as with non-linear MHD simulations. This result revises the simplified picture of fast island formation occurring only during the trigger event.
机译：通过其他MHD稳定性（Sawteeth，Fishbones，ELM等）的扰动播种新古典撕裂模式（NTMS）是必须在迭代中避免或控制的主要MHD问题之一。 NTMS可以导致血浆监禁的强烈降解甚至是破坏。本文比较了（3,2）NTMS在DIII-D和ASDEX升级到Kamaks中的播种。它在两个设备中都发现了一种模式，该模式可以启动作为理想的扭结模式，它在时间尺度上转换成撕裂模式（类似于10（-2））而不是触发事件的持续时间（类似于10（ -4））。这些调查结果与ASDEX升级中的（2,1）模式播种以及非线性MHD仿真吻合良好。该结果在触发事件期间修改了仅在触发事件期间发生的快速岛地层的简化图像。

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