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Observation of Spectral Broadening of Lower Hybrid Waves in Alcator C-Mod

机译：Alcator C-Mod中下部杂波的光谱展宽观察

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Observations of the spectral broadening of lower hybrid (LH) waves in Alcator C-Mod are presented. We report the dependenceof the pump broadeningon two plasma parameters: plasma density and magnetic topology. As the plasma density was raised, we observed a significant increase of the pump broadening at 10 dB below the maximum peak. However, at the constant plasma density, when the magnetic topology was changed from the diverted plasma to the inner wall limited plasma, the spectral broadening was reduced. In an attempt to understand the causes of this variation, we report the change of density profiles in front of the LH launcher in two different magnetic topologies. The model analyses indicate that both the scattering process and parametric decay instability can contribute to the spectral broadening. Further experimental investigations are necessary to identify the causality between spectral broadening and the degradation of lower hybrid current drive efficiency at high density plasmas.
机译：提出了对Alcator C-Mod中较低杂化（LH）波的光谱展宽的观察。我们报告了泵展宽对两个等离子体参数的依赖性：等离子体密度和磁拓扑。随着血浆密度的升高，我们观察到泵浦宽度在最大峰值以下10 dB处显着增加。然而，在恒定的等离子体密度下，当磁拓扑从转向等离子体变为内壁受限等离子体时，光谱展宽减小。为了理解这种变化的原因，我们报告了LH发射器前面两种不同的磁拓扑中密度分布的变化。模型分析表明，散射过程和参数衰减不稳定性均可导致光谱展宽。有必要进行进一步的实验研究，以查明在高密度等离子体下光谱展宽与较低混合电流驱动效率降低之间的因果关系。

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