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.

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., Zhang, S., Silburn, S., Howard, J., Yu, Y., Yuan, B., Wang, Z., Song, X., Liu, L., & 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
• Public URL: https://durham-repository.worktribe.com/output/1262451