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Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak.

Long, T. and Allcock, J. S. and Nie, L. and Sharples, R. M. and Xu, M. and Ke, R. and Zhang, S. and Silburn, S. A. and Howard, J. and Yu, Y. and Yuan, B. and Wang, Z. H. and Song, X. M. and Liu, L. and Duan, X. R. (2020) 'Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak.', Review of scientific instruments., 91 (8). 083504.


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.

Item Type:Article
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Publisher statement:© 2020 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Long, T., Allcock, J. S., Nie, L., Sharples, R. M., Xu, M., Ke, R., Zhang, S., Silburn, S. A., Howard, J., Yu, Y., Yuan, B., Wang, Z. H., Song, X. M., Liu, L. & Duan, X. R. (2020). Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak. Review of Scientific Instruments 91(8): 083504 and may be found at
Date accepted:24 July 2020
Date deposited:03 September 2020
Date of first online publication:06 August 2020
Date first made open access:06 August 2021

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