Design of phase contrast imaging on the HL-2A tokamak

•A phase contrast imaging diagnostic on the HL-2A tokamak is designed.•Time and space resolution of PCI on HL-2A are 2μs and 0.1mm.•Frequency and wavenumber range are 1–500kHz and 2–15cm−1. In this article we present the design of a phase contrast imaging (PCI) system on the HL-2A tokamak. This diag...

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Bibliographic Details
Published in:Fusion engineering and design 2017-11, Vol.123, p.802-806
Main Authors: Gong, S.B., Yu, Y., Xu, M., Jiang, W., Zhong, W.L., Shi, Z.B., Wang, H.J., Wu, Y.F., Yuan, B.D., Lan, T., Ye, M.Y., Duan, X.R.
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon dioxide lasers
Diagnostic systems
Diagnostics
High temperature plasmas
HL-2A
Image processing systems
Ion beams
Laser beams
PCI
Phase contrast
Phase shift
Phase transitions
Plasma density
Plasma density fluctuations
Plasma physics
Tokamak devices
Turbulence
Variation
Wavelengths
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Summary:•A phase contrast imaging diagnostic on the HL-2A tokamak is designed.•Time and space resolution of PCI on HL-2A are 2μs and 0.1mm.•Frequency and wavenumber range are 1–500kHz and 2–15cm−1. In this article we present the design of a phase contrast imaging (PCI) system on the HL-2A tokamak. This diagnostic is developed to infer line integrated plasma density fluctuations by measuring the phase shift of an expanded CO2 laser beam passing through magnetically confined high temperature plasmas. This system is designed to diagnose plasma density fluctuations with the maximum wavenumber of 15cm−1. The designed wavenumber resolution is 2cm−1, and the time resolution can reach 2μs. The broad kρs ranging from 0.2 to 3 makes it suitable for turbulence measurement.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2017.04.072