The scattering of millimeter-wave beams from electron density fluctuations and the associated beam broadening are experimentally demonstrated. Using a dedicated setup, instantaneous deflection and (de-)focusing of the beam due to density blobs on the beam path are shown to agree with full-wave simulations. The detected time-averaged wave power transmitted through the turbulent plasma is reproduced by the radiative-transfer model implemented in the WKBeam code, which predicts a ∼50% turbulence-induced broadening of the beam cross-section. The role of core turbulence for the considered geometry is highlighted.

中文翻译：

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TCV 托卡马克中的毫米波光束散射和等离子体湍流引起的展宽

实验证明了来自电子密度波动的毫米波束散射和相关的束加宽。使用专用设置，由于光束路径上的密度斑点导致光束的瞬时偏转和（去）聚焦显示与全波模拟一致。通过湍流等离子体传输的检测到的时间平均波功率由 WKBeam 代码中实现的辐射传递模型再现，该模型预测了约 50% 的湍流引起的光束横截面展宽。核心湍流对所考虑几何结构的作用被突出显示。