研究目的
To design and test a real-time two-color CO2/HeNe heterodyne laser interferometer for measuring the line integral electron density along the mid-plane of the MAST Upgrade tokamak with high temporal resolution and reliability.
研究成果
The initial testing of the new MAST-U interferometer shows promising results, with stable alignment and effective vibration isolation. Future work will focus on long-term stability testing and benchmarking the FPGA phase detection system against previous methods.
研究不足
The system's performance in the presence of plasma is not yet tested, and long-term stability, especially of the CO2 lasers and FPGA phase detection system, requires further benchmarking.
1：Experimental Design and Method Selection:
The design involves a two-color CO2/HeNe heterodyne laser interferometer to measure electron density and distinguish phase changes from vibrations.
2：Sample Selection and Data Sources:
The system is tested in a setup similar to the planned MAST-U installation, with adjustments for horizontal mounting and use of folding mirrors.
3：List of Experimental Equipment and Materials:
Includes CO2 and HeNe lasers, acousto-optic modulator, beam combiners, detectors, and an FPGA-based phase detection system.
4：Experimental Procedures and Operational Workflow:
The system's optical path, vibration isolation, and phase detection are detailed, with initial testing performed without plasma.
5：Data Analysis Methods:
Phase changes are analyzed using an FPGA-based system, with comparisons to previous systems and vibration tests.
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