System validation of CO2-laser-based phase contrast imaging on HL-2A tokamak

Yi Yu; Shaobo Gong; Min Xu; Boda Yuan; Yifan Wu; Lin Nie; Rui Ke; Minyou Ye; Xuru Duan

doi:10.3788/COL201816.121201

Journals >Chinese Optics Letters >Volume 16 >Issue 12 >Page 121201 > Article

Chinese Optics Letters
Vol. 16, Issue 12, 121201 (2018)

System validation of CO₂-laser-based phase contrast imaging on HL-2A tokamak

Yi Yu¹, Shaobo Gong^1,2, Min Xu^2,*, Boda Yuan^1,2..., Yifan Wu^1,2, Lin Nie², Rui Ke², Minyou Ye¹ and Xuru Duan²|Show fewer author(s)

Author Affiliations

¹School of Physics, University of Science and Technology of China, Hefei 230026, China

²Southwestern Institute of Physics, Chengdu 610041, China

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DOI: 10.3788/COL201816.121201 Cite this Article Set citation alerts

Yi Yu, Shaobo Gong, Min Xu, Boda Yuan, Yifan Wu, Lin Nie, Rui Ke, Minyou Ye, Xuru Duan, "System validation of CO₂-laser-based phase contrast imaging on HL-2A tokamak," Chin. Opt. Lett. 16, 121201 (2018) Copy Citation Text

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Abstract

System validation and density fluctuation calibration of phase contrast imaging (PCI) on an HL-2A tokamak are presented. Signals from different channels show not only a pronounced modulation of an incident laser beam induced by a sound wave, but also an excellent magnification and low image distortion of optics. The frequency-wavenumber spectrum is achieved by using two-dimensional Fourier transform of time series signals. The conversion coefficient between detected signal amplitude and chord integral plasma density fluctuation is 2.35 × 10¹³ m²/mV, which promises a suitable signal level at the order of volts of the PCI in typical HL-2A discharges.