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Effects of LH power on SOL density profiles and LH coupling on Alcator C-Mod

机译：LH功率对Alcator C-Mod的SOL密度分布和LH耦合的影响

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摘要

A swept-frequency X-mode reflectometer has been used to measure the scrape-off-layer (SOL) density profiles with and without lower hybrid (LH) power at three poloidal locations adjacent to the LH launcher for various plasma parameters in order to understand the coupling of LH waves on Alcator C-Mod. LH power has been observed to create significant poloidal SOL density profile asymmetries that are correlated with visible video camera images of emissivity patterns in front of the LH launcher. The observed density profile asymmetries depend on LH power, □ηe magnetic geometry and magnetic field direction. A 2D diffusive-convective model has been used to show that these density profile modifications are consistent with a LH vortex, where LH power drives E × B drifts that then modify the SOL density profile. In particular, the simulations show that the density profile can possibly create a net poloidally averaged density depletion in front of the waveguide rows. A LH slab coupling model is then used to show that the simulated reflection coefficients strongly depend on the poloidal density profile asymmetries. The simulated LH power reflection coefficients agree with the experimental reflection coefficients only after the observed density depletion is included in the model.
机译：为了了解不同的等离子体参数，已使用扫频X模反射仪来测量在有和没有较低杂化（LH）功率的情况下在邻近LH发射器的三个极点位置上的刮下层（SOL）密度分布，以了解LH波在Alcator C-Mod上的耦合。已经观察到LH功率会产生明显的多倍体SOL密度分布不​​对称性，该不对称性与LH启动器前面的发射率模式的可视摄像机图像相关。观察到的密度分布不​​对称性取决于LH功率，磁性几何形状和磁场方向。二维扩散对流模型已被用来显示这些密度分布的修改与LH涡旋一致，其中LH功率驱动E×B漂移，然后修改了SOL密度分布。尤其是，仿真表明，密度分布可能在波导行的前面产生净的倍数平均密度损耗。然后，使用LH平板耦合模型表明，模拟反射系数强烈取决于极向密度分布的不对称性。仅在模型中包含观察到的密度损耗之后，模拟的LH功率反射系数才与实验反射系数一致。

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