We report the development of a new interferometer with two stable, high-power, 320 GHz solid-state sources in Heliotron J. A heterodyne Michelson interferometer optical scheme is employed. Two solid-state oscillators are utilized as sources with a fixed frequency at 320 GHz and frequency tunable of 312–324 GHz. Quasi-optical techniques are used for beam transmission. The beam is elongated in the vertical direction with two off-axis parabolic mirrors and injected into the plasma as a sheet beam for the multi-channel measurement (>5 ch.). Passing through the plasma, the beam is reflected at a retroreflector-array installed at the vacuum chamber wall. The retroreflector-array is a bunch of retroreflector structures, which can suppress the beam refraction caused by plasma without much space inside a vacuum chamber unlike a single retroreflector and can facilitate the system design. The source, detectors, and the retroreflector-array are tested to evaluate their basic performance on a tabletop experiment.

中文翻译：

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在 Heliotron J 中开发用于高密度等离子体测量的多通道 320 GHz 干涉仪

我们报告了 Heliotron J 中具有两个稳定、高功率、320 GHz 固态源的新型干涉仪的开发。采用了外差迈克尔逊干涉仪光学方案。两个固态振荡器用作具有 320 GHz 固定频率和 312-324 GHz 频率可调的源。准光学技术用于光束传输。光束通过两个离轴抛物面镜在垂直方向上被拉长，并作为片状光束注入等离子体，用于多通道测量（> 5 通道）。通过等离子体，光束被安装在真空室壁上的回射器阵列反射。后向反射器阵列是一堆后向反射器结构，与单个后向反射器不同，它可以抑制由等离子体引起的光束折射，而无需在真空室内部留出足够的空间，并且可以简化系统设计。对光源、探测器和后向反射器阵列进行测试，以评估它们在桌面实验中的基本性能。