Real-Time Data Processing Method for CO2 Dispersion Interferometer on EAST

A real-time data processing system is designed for the carbon dioxide dispersion interferometer（CO 2 -DI） on EAST. The system utilizes the parallel and pipelining capabilities of an fieldprogrammable gate array（FPGA） to digitize and process the intensity of signals from the detector.Finally, the real-time electron density signals are exported through a digital-to-analog converter（DAC） module in the form of analog signals. The system has been successfully applied in the CO 2 -DI system to provide low-latency electron density input to the plasma control system on EAST. Experimental results of the latest campaign with long-pulse discharges on EAST（2022–2023） demonstrate that the system can respond effectively in the case of rapid density changes, proving its reliability and accuracy for future electron density calculation.