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MHD stability analysis of diagnostic optimized configuration shots in JET

机译：JET中诊断优化配置镜头的MHD稳定性分析

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摘要

The plasma edge MHD stability is analysed for several JET discharges in the diagnostic optimized configuration. The stability analysis of Type I ELMy plasmas shows how after an edge localized mode (ELM) crash the plasma edge is deep in the stable region against low- to intermediate-n peeling-ballooning modes. As the pressure gradient steepens and the edge current builds up, the plasma reaches the low- to intermediate-n peeling-ballooning mode stability boundary just before the ELM crash. Increasing the plasma fuelling by gas puffing makes the second stability access against high-n ballooning modes narrower until it closes completely and the ELMs change from Type I to Type III. Reducing the plasma heating has a similar effect. Increasing the safety factor at the plasma edge improves the stability against low- to intermediate-n modes allowing steeper pressure gradients to develop before an ELM crash.
机译：在诊断优化配置中分析了几个JET放电的等离子体边缘MHD稳定性。 I型ELMy等离子体的稳定性分析表明，在发生边缘局部化模式（ELM）碰撞后，等离子体边缘在稳定区域中相对于中低n到中等n的剥离气球模式如何深。随着压力梯度的增加和边缘电流的增加，等离子体在ELM崩溃之前就达到了从低到中n的剥离-膨胀模式稳定边界。通过吹气增加等离子燃料的充实使针对高n膨胀模式的第二稳定性通道变窄，直到其完全关闭并且ELM从I型变为III型。减少等离子体加热具有类似的效果。增大等离子体边缘的安全系数可提高对低n至中n模的稳定性，从而在ELM崩溃前可产生更陡的压力梯度。

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