A five-chord interferometer based on terahertz solid state sources has been successfully installed on the Keda Torus eXperiment (KTX), a reversed field pinch machine. The optical design has been carefully optimized for the uniform distribution of beam light to fully use the limited power source (∼2 mW). By setting the telescopic mirror unit, the beam waist is located in the center of the vacuum vessel and its diameter is in the range of the Rayleigh length. The beam width across the plasma area is improved to ∼20 mm to minimize crosstalk and beam energy loss. After careful beam alignment, the phase noise for each channel can reach 0.004π. The radial profiles of electron density on the KTX are inverted, and density fluctuation associated with instabilities is shown based on the forward-scattering signals.

中文翻译：

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在 Keda Torus eXperiment (KTX) 上使用多通道太赫兹固态干涉仪系统测量密度分布和波动

基于太赫兹固态源的五弦干涉仪已成功安装在 Keda Torus eXperiment (KTX) 上，这是一种反向场夹点机。光学设计已针对光束的均匀分布进行了精心优化，以充分利用有限的电源（~2 mW）。通过设置伸缩镜单元，束腰位于真空容器的中心，其直径在瑞利长度范围内。等离子体区域的光束宽度提高到 20 毫米，以最大限度地减少串扰和光束能量损失。经过仔细的光束对准，每个通道的相位噪声可以达到 0.004π。KTX 上电子密度的径向分布被反转，并且基于前向散射信号显示与不稳定性相关的密度波动。