Research Information

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YAMAGUCHI Satarou

Superconducting Technology for Sustainable Future

  In 2005, I built the world's first experimental 20 m DC cable system that used a high-temperature superconductor, receiving aid from the Ministry of Education, Culture, Sports, Science and Technology. This was the start of my full-fledged research on superconducting DC power transmission at Chubu University. At the time, many research teams were working on the R&D of AC cables. I selected DC for the sake of originality. As such, my research focused on reducing the amount of heat invasion into the cryogenic system. The reason for this is that it was highly likely that heat invasion into the cryogenic system would be a major issue due to the large surface area of the cryostat in proportion to its volume. Subsequent consulting literature showed that liquid helium had also been used in superconducting cable experiments and researches before the discovery of high-temperature superconductivity. However, the chiller consumed an exceptionally large amount of power due to substantial heat invasion, and the R&D was soon abandoned. For this reason, I constructed a heat-insulated double-layer test bench separately from the experimental cable system and continued my R&D efforts. While, in recent years, heat invasion reduction has become a major issue as an R&D theme on a global scale, I have been conducting R&D on heat invasion reduction for 12 years. At the same time, I began addressing a research challenge relating to power converters and power devices required for DC power transmission. Because the ultimate goal has been to construct an intercontinental superconducting cable, the principal challenge has been to establish a scaling law for the construction of a long cable. Consequently, my perspective on research techniques has remained unchanged for 12 years.

  Since I undertook this research, I have continued my R&D efforts, constructing a 200 m cable (on the premises of Chubu University), a 500 m cable, and a 1 km cable (in Ishikari City), thanks to donations from the entrepreneur FUJIWARA Hiroshi, the Strategic Research Infrastructure Building Support Program for Private Universities run by the Ministry of Education, Culture, Sports, Science and Technology, and funds from the Ministry of Economy, Trade and Industry and NEDO*1. Fortunately, the experimental results were all positive with these systems. As the next step, I am considering the construction of a 10 km cable in a joint effort with a company.

  Additionally, I have started a joint research program with members including JAXA*2 to explore the application of superconducting technology to aircraft. To enhance the university's role of promoting basic research, the Center of Applied Superconductivity and Sustainable Energy Research and the College of Engineering played a central role in both forming a team within the university to give consideration to socioeconomic factors, and establishing a research framework led by the President. These frameworks aim to serve as an R&D hub in the Chubu region.

Notes:
*1. New Energy and Industrial Technology Development Organization
*2. Japan Aerospace Exploration Agency


200m-class superconducting DC power transmission proving test system (CASER-2)


Center of Applied Superconductivity and Sustainable Energy Research

YAMAGUCHI Sataro

YAMAGUCHI Satarou
Doctor of Science
Director
Center of Applied Superconductivity and Sustainable Energy Research
Professor
Dept. of Electrical Engineering, College of Engineering
Innovative Energy Science and Engineering, Graduate School of Engineering

PROFILE
Graduated from the Graduate School of Science, Nagoya University
Doctor of Science
Field of Study: Applied physics
Research Topics: Superconducting system, transport phenomena in semiconductor, energy conversion, data acquisition, semiconductor processing

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