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首页> 外文期刊>Applied optics >Two-color medium-infrared scanning interferometer for the Frascati tokamak upgrade fusion test device
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Two-color medium-infrared scanning interferometer for the Frascati tokamak upgrade fusion test device

机译：弗拉斯卡蒂托卡马克升级融合测试设备的双色中红外扫描干涉仪

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摘要

A scanning beam interferometer installed on the Frascati tokamak upgrade (FTU) experiment is presented. The scanning beam scheme combined with the small dimensions of the beams produces a system with very high spatial resolution: more than 30 adjacent (nonoverlapping) chords sample most of the plasma cross section. A good time resolution is achieved by the use of a proper scanning device, with a scanning frequency >=8 kHz. Very fast events are measured by three additional fixed lines of sight providing a time resolution >=100 kHz. The instrument is a two-color medium-infrared-compensated-type interferometer; two wavelengths (colors) are used to measure both the density and the mechanical vibrations of optical components. A CO_(2) laser (lambda velence 10.6 (mu)m) is the main light source, and a CO laser (lambda velence 5.4 (mu)m) is the compensation one. The optical scheme is a double pass Mach-Zehnder type. All the retroreflector mirrors are mounted directly on the FTU mechanical structure thanks to the compensation system that allows for large vibration amplitudes of optical components. Heterodyne detection at 30 and 40 MHz is obtained by frequency shifting the reference beams with two acousto-optic modulators (Bragg cells). Many features are implemented to achieve high measurement accuracy and reliability. A real-time system computes the integral density measured on one of the fixed lines of sight and provides an analog signal for density feedback control. The interferometer was used to measure density profiles both in medium-density discharges (n_(e) approx= 10~(20) m~(-3)) and in high-density pellet injected discharges (n_(e) approx= 7-8 X 10~(20) m~(-3)). The measurement error is approx=2 X 10~(18) m~(-2) under optimal conditions but can be higher in some cases, mainly because of the large tilt of the retroreflector mirrors.
机译：介绍了安装在Frascati托卡马克升级（FTU）实验上的扫描光束干涉仪。扫描光束方案与光束的小尺寸相结合，产生了一个具有非常高的空间分辨率的系统：超过30个相邻（不重叠）的弦采样了大部分等离子体截面。通过使用适当的扫描设备（扫描频率> = 8 kHz）可获得良好的时间分辨率。通过三个附加的固定视线测量非常快的事件，这些视线提供的时间分辨率> = 100 kHz。该仪器是两色中红外补偿型干涉仪。两个波长（颜色）用于测量光学组件的密度和机械振动。主要光源是CO_（2）激光器（λ费率为10.6μm），补偿激光器是CO激光器（λ费率为5.4μm）。光学方案是双通道马赫曾德尔型。借助补偿系统，所有后向反射镜都直接安装在FTU机械结构上，该补偿系统允许光学组件产生较大的振幅。通过使用两个声光调制器（布拉格单元）对参考光束进行频移，可以获得30和40 MHz的外差检测。实现了许多功能以实现高测量精度和可靠性。实时系统计算在固定视线之一上测得的积分密度，并提供用于密度反馈控制的模拟信号。干涉仪用于测量中密度放电（n_（e）大约= 10〜（20）m〜（-3））和高密度颗粒注入放电（n_（e）大约= 7- 8 X 10〜（20）m〜（-3））。在最佳条件下，测量误差约为= 2 X 10〜（18）m〜（-2），但在某些情况下可能会更高，这主要是由于后向反射镜的倾斜较大。

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