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A real time data acquisition system is being implemented using a configurable muti-functional FPGA PCIe card. The FPGA card acquires 16 channels signal at 250 kHz, calculates 512-point Fast Fourier Transform (FFT), and provides the full data set of both original raw data and FFT derived data to the real-time computer. Data is recorded to the Korea Superconducting Tokamak Advanced Research (KSTAR) MDSplus database outside of plasma control system (PCS) for analysis and internal to PCS for algorithm use. Part of the real time version of disruption event characterization and forecasting (DECAF) running inside PCS uses this input for internal calculations.
When constructing the FFT engine in hardware, Intel FFT IP core is used to implement FFT. The detailed pipelining and timing for 16 channel 512 sample points for the FFT engine is described in the paper. Dual FIFO and RAM ping pong architecture are used for data reading, processing, and writing. The test result shows that the pipelined FFT engine works as expected. This work was supported by DOE contract No. DEAC0209CH11466 and grant DE-SC0020415.
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