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H-mode power threshold and transition in ASDEX Upgrade

机译:ASDEX升级中的H模式功率阈值和过渡

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Global and local H-mode threshold analyses are presented and discussed. The density window was extended up to the density limit towards which the power threshold exhibits a dramatic increase. First results with the new divertor are compared to the previous threshold scaling. Local edge measurements at the L-H transition show that the temperature decreases slightly with density and increases with magnetic field, and that the ion collisionality at the plasma edge is always clearly above unity, between 5 and 15. Experiments at high power threshold exhibit improved L-mode confinement and suggest that two mechanisms are required for the L-H transition. [References: 5]
机译:提出并讨论了全局和局部H模式阈值分析。密度窗口一直扩展到功率阈值呈现急剧增加的密度极限。将使用新偏滤器的第一结果与先前的阈值缩放进行比较。在LH跃迁处的局部边缘测量结果表明,温度随密度而略有降低,并随磁场而升高,并且等离子体边缘处的离子碰撞性始终明显高于1,在5至15之间。在高功率阈值下进行的实验显示出改进的L-模式限制,并建议LH过渡需要两种机制。 [参考:5]

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