Profile Aided Real-Time Plasma Electron Density Feedback Control Based on FPGA on J-TEXT
Profile Aided Real-Time Plasma Electron Density Feedback Control Based on FPGA on J-TEXT
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DOI：
10.1109/tns.2017.2782788
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发表时间：
2018-02
影响因子：
1.8
通讯作者：
Wei Zheng;F. Hu;Ming Zhang;T. Yuan;Xueqing Zhao;Yinan Zhou;Jie Chen;Li Gao;Yang Liu;P. Shi;Yuan Pan
中科院分区：
文献类型：
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作者：
Wei Zheng;F. Hu;Ming Zhang;T. Yuan;Xueqing Zhao;Yinan Zhou;Jie Chen;Li Gao;Yang Liu;P. Shi;Yuan Pan
J-TEXT新部署的三波偏振干涉仪(Polaris)系统比旧的HCN干涉仪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。新的等离子体电子密度反馈控制系统是在已有的基于FlexRIO现场可编程门阵列的Polaris数据采集系统上实现的。增加了一块模拟输出卡来控制排气的压电晶阀。该密度反馈控制系统能够利用快速傅里叶变换从中频信号中提取相移信息，计算出多根弦的密度，并将控制信号实时输出到压电晶阀。NI P2P技术用于在不使用CPU的情况下将数据从一个FlexRIO现场可编程门阵列实时传输到另一个FlexRIO现场可编程门阵列；因此，板上所有的FlexRIO现场可编程门阵列都可以计算密度，只有一个采集参考弦信号。该系统还可以计算密度分布。利用密度分布，可以用补偿中心弦积分密度或平均密度作为控制目标。此外，实时的密度分布数据也为未来的等离子体控制系统和干扰检测系统提供了有用的数据。
The J-TEXT newly deployed three-wave polarimeter–interferometer (POLARIS) system provides a better temporal and spatial resolution of the plasma electronic density than the that of old HCN interferometer system. The new plasma electron density feedback control system is implemented on the already existing POLARIS data acquisition system which is based on FlexRIO field-programmable gate array (FPGA). An analog output card is added to control the piezoelectric crystal valve of the gas puffing. The density feedback control system is able to extract the phase-shift information from the intermediate frequency signal using fast Fourier transform, calculate density of multiple chords, and output control signal to the piezoelectric crystal valve in real time. NI P2P technology is used to transfer data from a FlexRIO FPGAs to another in real time without using the CPU; thus, all FlexRIO FPGAs onboard can calculate the density with only one acquiring the reference chord signal. This system is also able to calculate density profile. With the density profile, it can use compensated central chord integrated or average density as control target. Also, the real-time density profile data are useful for the future plasma control system and disruption detection system.