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

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.

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Authors

T. Long

J.S. Allcock

L. Nie

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



Abstract

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.

Citation

Long, T., Allcock, J., Nie, L., Sharples, R., Xu, M., Ke, R., …Duan, X. (2020). Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak. Review of Scientific Instruments, 91(8), Article 083504. https://doi.org/10.1063/5.0005609

Journal Article Type Article
Acceptance Date Jul 24, 2020
Online Publication Date Aug 6, 2020
Publication Date 2020-08
Deposit Date Sep 2, 2020
Publicly Available Date Aug 6, 2021
Journal Review of Scientific Instruments
Print ISSN 0034-6748
Electronic ISSN 1089-7623
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 91
Issue 8
Article Number 083504
DOI https://doi.org/10.1063/5.0005609

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Copyright 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 https://doi.org/10.1063/5.0005609





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