The J-TEXT newly deployed three-wave polarimeter-interferometer (POLARIS) system provides a better time and spatial resolution of the plasma electronic density than the old HCN interferometer system. The plasma electron density feedback control system is implemented on the already existing POLARIS DAQ system which is based on FlexRIO FPGA. Another FlexRIO board with an output module is added to implement the feedback control algorithm and feed the output to the piezoelectric crystal valve. The density feedback control system is able to extract the phase difference information from the intermedia frequency signal using FFT, calculate density of multiple channels and output control signal to the piezoelectric crystal valve in real-time. NI P2P technology is used to transfer processed data from a FlexRIO board to another in real-time without using the CPU. This system is also able to calculate density profile. With the density profile it can use compensated central chord line integrated or average density as control target. Also the real-time density profile data is useful for future plasma control system and disruption detection system.
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机译:与旧的HCN干涉仪系统相比,新近部署的J-TEXT三波偏振计干涉仪(POLARIS)系统提供了更好的等离子体电子密度的时间和空间分辨率。等离子体电子密度反馈控制系统是在基于FlexRIO FPGA的现有POLARIS DAQ系统上实现的。添加了另一个带有输出模块的FlexRIO板,以实现反馈控制算法,并将输出馈送到压电晶体阀。密度反馈控制系统能够使用FFT从中间频率信号中提取相位差信息,计算多个通道的密度并将控制信号实时输出到压电晶体阀。 NI P2P技术用于将处理后的数据从FlexRIO板实时传输到另一个板,而无需使用CPU。该系统还能够计算密度分布。有了密度曲线,它可以使用补偿后的中央弦线积分或平均密度作为控制目标。实时密度分布数据也可用于将来的等离子体控制系统和干扰检测系统。
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