Chinese Optics Letters, 2018, 16 (12): 121201, Published Online: Dec. 7, 2018
System validation of CO2-laser-based phase contrast imaging on HL-2A tokamak
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 m 2/mV, which promises a suitable signal level at the order of volts of the PCI in typical HL-2A discharges.
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[J]. Chinese Optics Letters, 2018, 16(12): 121201.