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

T. Long, J. S. Allcock, L. Nie*, R. M. Sharples, M. Xu, R. Ke, S. Zhang, S. A. Silburn, J. Howard, Y. Yu, B. Yuan, Z. H. Wang, X. M. Song, L. Liu, X. R. Duan

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)


    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.

    Original languageEnglish
    Article number083504
    JournalReview of Scientific Instruments
    Issue number8
    Publication statusPublished - 1 Aug 2020


    Dive into the research topics of 'Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak'. Together they form a unique fingerprint.

    Cite this