A new Doppler coherence imaging spectroscopy interferometer has been developed on the HL-2A tokamak for the scrape-off-layer impurity flow measurement. Its spatial resolution is estimated to be up to ∼0.8 mm in the horizontal direction and ∼9 mm in the vertical direction, with a field of view of ∼34°. Its typical temporal resolution is about 1 ms. This salient feature allows for time-resolved 2D measurements in short-time phenomena on HL-2A, such as edge localized modes. Group delay and interference fringe pattern were calibrated with a dedicated calibration system. The robustness of group delay calibration and the feasibility of the extrapolation model for fringe pattern calibration are demonstrated. In this paper, we report the details of the optical instruments, calibration, and the initial experimental results of this Doppler coherence imaging spectroscopy interferometer.

中文翻译：

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HL-2A 托卡马克刮除层杂质流的多普勒相干成像

在HL-2A托卡马克上开发了一种新的多普勒相干成像光谱干涉仪，用于刮除层杂质流量测量。其空间分辨率估计为水平方向~0.8 mm，垂直方向~9 mm，视场为~34°。其典型的时间分辨率约为 1 毫秒。这一显着特征允许在 HL-2A 上的短时间现象中进行时间分辨二维测量，例如边缘局部模式。群延迟和干涉条纹图案使用专用校准系统进行校准。证明了群延迟校准的鲁棒性和条纹图案校准外推模型的可行性。在本文中，我们报告了光学仪器、校准、