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Identity of the JET M-mode and the ASDEX Upgrade I-phase phenomena

机译：JET M模式和ASDEX升级I相现象的识别

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摘要

An H-mode plasma state free of edge-localized mode (ELM), close to the L-H transition with clear density and temperature pedestal has been observed both at the Joint European Torus (JET) and at the ASDEX Upgrade (AUG) tokamaks usually identified by a low frequency (LFO, 1-2 kHz), m = 1, n = 0 oscillation of the magnetics and the modulation of pedestal profiles. The regime at JET is referred to as M-mode while at AUG as intermediate phase or I-phase. This contribution aims at a comparative analysis of these phenomena in terms of the density and temperature pedestal properties, the magnetic oscillations and symmetries. Lithium beam emission spectroscopy (Li-BES) and reflectometer measurements at JET and AUG show that the M-mode and the I-phase modulates the plasma edge density. A high frequency oscillation of the magnetics and the density at the pedestal is also associated with both the M-mode and the I-phase, and its power is modulated with the LFO frequency. The power modulation happens simultaneously in every Mirnov coil signal where it can be detected. The bursts of the magnetic signals and the density at the pedestal region are followed by the flattening of the density profile, and by a radially outward propagating density pulse in the scrape-off layer (SOL). The analysis of the helium line ratio spectroscopy (He-BES) signals at AUG revealed that the electron temperature is modulated in phase with the density, thus the I-phase modulates the pressure profile gradient. This analysis gave opportunity to compare Li-BES and He-BES density profiles at different locations suggesting a toroidal and poloidal symmetry of the density modulation. The presented results indicate that the regimes, the AUG I-phase and the JET M-mode, exhibit similar characteristics, which leads to the conclusion that the regimes are likely the same.
机译：通常在联合欧洲圆环（JET）和ASDEX升级（AUG）托卡马克中都观察到没有边缘定位模式（ELM）的H模式等离子体状态，接近LH过渡，具有清晰的密度和温度基座。通过低频（LFO，1-2 kHz），m = 1，n = 0磁的振荡和基座轮廓的调制。 JET的状态称为M模式，而AUG的状态称为中间阶段或I相。该贡献旨在根据密度和温度基座特性，磁振荡和对称性对这些现象进行比较分析。锂离子束发射光谱（Li-BES）和反射计在JET和AUG的测量表明，M模式和I相可调节等离子体的边缘密度。磁场的高频振荡和基座处的密度也与M模式和I相相关，其功率由LFO频率调制。功率调制在每个可以检测到的Mirnov线圈信号中同时发生。磁信号的爆发和在基座区域处的密度之后是密度分布的平坦化，以及在刮除层（SOL）中径向向外传播的密度脉冲。对AUG处的氦线比光谱（He-BES）信号的分析表明，电子温度与密度同相调制，因此I相对压力分布梯度进行调制。该分析为比较Li-BES和He-BES在不同位置的密度分布提供了机会，表明密度调制的环形和多倍体对称性。给出的结果表明，AUG I期和JET M模式这两个方案表现出相似的特征，从而得出结论，该方案可能是相同的。

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