System validation and density fluctuation calibration of phase contrast imaging(PCI) on an HL-2 A tokamak are presented. Signals from different channels show not only a pronounced modulation of an incident laser beam ...System validation and density fluctuation calibration of phase contrast imaging(PCI) on an HL-2 A 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-2 A discharges.展开更多
基金supported by the National Magnetic Confinement Fusion Energy Research Project(No.2015GB120002)the National Key Research and Development Program of China(No.2017YFE0300405)the National Natural Science Foundation of China(Nos.11705052,11575055,and 11611130164)
文摘System validation and density fluctuation calibration of phase contrast imaging(PCI) on an HL-2 A 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-2 A discharges.
