Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak |
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Affiliation: | 1. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, People's Republic of China;2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China;3. Southwestern Institute of Physics, Chengdu 610041, People's Republic of China |
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Abstract: | A synchronous demodulation system is proposed and deployed for CO2 dispersion interferometer on HL-2A,which aims at high plasma density measurements and real-time feedback control.In order to make sure that the demodulator and the interferometer signal are synchronous in phase,a phase adjustment (PA) method has been developed for the demodulation system.The method takes advantages of the field programmable gate array parallel and pipeline process capabilities to carry out high performance and low latency PA.Some experimental results presented show that the PA method is crucial to the synchronous demodulation system and reliable to follow the fast change of the electron density.The system can measure the lineintegrated density with a high precision of 2.0 × 1018 m-2. |
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Keywords: | plasma diagnosis FPGA real-time electron density |
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