SOL非稳态输运的定量研究进展
Recent progress towards a quantitative description of filamentary SOL transport
摘要：
本文总结了ASDEX-升级托卡马克（AUG）装置上有关超导输运的最新研究结果，并讨论了它们之间的相互关系，试图得到一个有关SOL超导输运的相干图象：外中平面L模密度肩的形成与鞘层限制区和惯性超导区之间的过渡之间存在明显的相关性。偏滤器碰撞性被认为是触发跃迁的参数。一个明确的离子温度降低发生在远SOL的过渡后，无论是背景和灯丝。这与离子温度分布的强烈变化相一致，离子温度分布偏离高斯性，并且由低于$5$ eV的强峰主导。由临界值的碰撞触发的灯丝过渡机制似乎是普遍适用于间ELM H-模式等离子体，虽然观察到氘燃料相关的第二个阈值。EMC 3-EIRENE中性动力学模拟结果表明，在肩部形成后，在主室壁附近形成电离锋。最后，一个明显的增加溶胶不透明度中性观察到相关的肩形成。一个共同的SOL运输框架，提出了所有这些结果的帐户，并讨论了它们对下一代设备的潜在影响。
英文摘要：
A summary of recent results on filamentary transport, mostly obtained in the ASDEX-Upgrade tokamak (AUG), is presented and discussed in an attempt to produce a coherent picture of SOL filamentary transport: A clear correlation is found between L-mode density shoulder formation in the outer midplane and a transition between the sheath limited and the inertial filamentary regimes. Divertor collisionality is found to be the parameter triggering the transition. A clear reduction of the ion temperature takes place in the far SOL after the transition, both for the background and the filaments. This coincides with a strong variation of the ion temperature distribution, which deviates from Gaussianity and becomes dominated by a strong peak below $5$ eV. The filament transition mechanism triggered by a critical value of collisionality seems to be generally applicable to inter-ELM H-mode plasmas, although a secondary threshold related to deuterium fueling is observed. EMC3-EIRENE simulations of neutral dynamics show that an ionization front near the main chamber wall is formed after the shoulder formation. Finally, a clear increase of SOL opacity to neutrals is observed associated to the shoulder formation. A common SOL transport framework is proposed account for all these results, and their potential implications for future generation devices are discussed.
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