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Turbulence Response in the High Ti Discharge of the LHD

机译：LHD高钛放电中的湍流响应

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摘要

A high ion temperature (Ti) was achieved using a combination of perpendicular and parallel injected neutral beams in the Large Helical Device (LHD). Microturbulence spatial profiles in a high-Ti discharge were measured by two-dimensional phase contrast imaging (2D-PCI) through almost the entire vertical central chord. The 2D-PCI microturbulence spectral ranges covered wavenumbers (k) of 0.1-1 mm?1 and frequencies (f) of 20-500 kHz. The ion thermal conductivity (χi) increased in the entire region with increasing Ti. However, the difference between the experimental and neoclassical values of χi became smaller at ρ i phase. Increasing fluctuation was not observed at this location, suggesting improved ion energy transport in this region. On the other hand, at ρ > 0.5, χi deviated from the neoclassical value due to enhancement of the experimental χi and reduction in the neoclassical χi by a positive radial electric field. Increasing turbulence was observed at ρ = 0.6-0.8, with fluctuations likely propagated to the ion diamagnetic direction in the plasma frame, suggesting that the observed turbulence degrades the ion energy transport at this location in the high-Ti phase.
机译：通过在大型螺旋装置（LHD）中使用垂直和平行注入的中性束，可以达到较高的离子温度（T i ）。高T i 放电中的微湍流空间分布是通过二维相衬成像（2D-PCI）在几乎整个垂直中央弦上进行测量的。二维PCI微湍流光谱范围涵盖了0.1-1 mm ？1 的波数（k）和20-500 kHz的频率（f）。随着T i 的增加，整个区域的离子热导率（χ i ）增加。然而，在ρi 阶段，χ i 的实验值和新古典值之间的差异变小。在该位置未观察到更大的波动，表明该区域离子能量传输得到改善。另一方面，在ρ> 0.5时，由于实验χ i 的增强和新古典χ i <的减小，χ i 偏离了新古典值。 / sub>通过一个正的径向电场。在ρ= 0.6-0.8处观察到湍流增加，并且波动可能在等离子体框架中传播到离子反磁方向，这表明所观察到的湍流会降低高T i 阶段。

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