Mitsubishi Electric Corporation Kyoto University National Institute for Fusion Science Plasma Measurement System Configuration Mitsubishi Electric Corporation (hereafter, Mitsubishi Electric), Kyoto University (hereafter, Kyoto University) Institute of Advanced Energy, and National Institute for Fusion Science (hereafter, NIFS) have constructed a world-class (※1) microwave plasma measurement system for fusion energy (※2) capable of long-term, multi-point simultaneous measurement of plasma states. Furthermore, the successful demonstration of this system was achieved on the fusion experimental device "Heliotron J" (※3) owned by Kyoto University. Mitsubishi Electric, Kyoto University, and NIFS will promote the development of plasma measurement technology essential for the social implementation of fusion energy. Fusion energy is expected to be a next-generation energy source for realizing a decarbonized society. The Japanese government is promoting research and development and industry-academia-government collaboration with a view to power generation demonstrations in the 2030s through the "Fusion Energy Innovation Strategy" (※4) and related policies. For the social implementation of fusion energy, the establishment of highly reliable measurement technology that can grasp plasma states in real-time, which is indispensable for controlling fusion plasma at temperatures exceeding 100 million degrees Celsius, is required. Microwave measurement technology is considered promising as one such technology. Microwave measurement technology is characterized by its ability to install critical equipment away from the plasma, even within a fusion reactor where equipment is susceptible to damage from neutron irradiation. Mitsubishi Electric, Kyoto University, and NIFS have been jointly working on the advancement and device implementation of microwave measurement technology for fusion energy since 2025. This system uses microwaves from a frequency comb (※5) that simultaneously contain