Signal Processing System for Solid Source Interferometer on EAST

A signal processing system is designed for the terahertz solid-source interferometer (SSI) system on Experimental Advanced Superconducting Tokamak (EAST), which can be used for real-time electron density calculation. This system calculates the phase difference between the detection signal and reference signal which acquired by the solid source interferometer system and then unwraps the wrapped phase value to output the electron density value in real time. The system is architected on a hardware development board with high speed, high accuracy, strong anti-interference capability and wide adaptability, which is suitable for EAST laser interferometer system to obtain the real-time electron density data and provide valid density information to plasma feedback control system.