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首页> 外文期刊>Plasma physics and controlled fusion >Inter-ELM behaviour of the electron density and temperature pedestal in ASDEX upgrade
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Inter-ELM behaviour of the electron density and temperature pedestal in ASDEX upgrade

机译：ASDEX升级中电子密度和温度基座的ELM间行为

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摘要

The behaviour of the recovery of the electron temperature and density during individual ELM (edge localized mode) cycles has been examined closely for a series of type I ELMy H-mode discharges with different fuelling levels and medium collisionality. A characterization of the typical ELM recovery cycle has been established. Distinct phases have been observed in the build-up of the plasma edge profiles after their relaxation caused by the ELM crash. A thorough evaluation of ELM-synchronized data has revealed that the recovery of the electron temperature and density pedestals are correlated. A new behaviour has been discovered in the build-up phase of the plasma edge, during which the temperature stagnates while the density profile steepens. It was found that in some cases the ELM is triggered immediately after the recovery of the pressure profile, consistent with the expectations from edge ballooning theory, while in other cases all edge profiles reached their final shape a long time before the next ELM occurred. The theory that a delayed edge current induces the actual crash could not be confirmed; the current diffusion seems only to play a minor role in the edge of the plasma.
机译：对于一系列具有不同加油量和中等碰撞性的I型ELMy H模式放电，已经仔细检查了各个ELM（边缘局限模式）循环中电子温度和密度的恢复行为。已经建立了典型的ELM恢复周期的特征。在由ELM碰撞引起的弛豫之后，在等离子体边缘轮廓的建立中已经观察到明显的相位。对ELM同步数据的透彻评估表明，电子温度的恢复与密度基座是相关的。在等离子体边缘的聚集阶段发现了一种新的行为，在此期间温度停滞而密度分布变陡。已经发现，在某些情况下，ELM在压力分布恢复后立即触发，这与边缘膨胀理论的预期一致，而在其他情况下，所有边缘分布在下一次ELM发生之前很长时间就达到了最终形状。边缘电流延迟会引起实际碰撞的理论无法得到证实。当前的扩散似乎只在等离子体的边缘起很小的作用。

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