System validation of CO2-laser-based phase contrast imaging on HL-2A tokamak
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摘要:
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 frequencywavenumber 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 × 1013m-2/mV,which promises a suitable signal level at the order of volts of the PCI in typical HL-2A discharges.