Enabling Technology Project

E2 Superconducting Electric Power Equipment Using Liquid Hydrogen Cooling

Outline of the area

Hiroyuki Ohsaki Professor, The University of Tokyo
Hiroyuki Ohsaki
Professor, The University of

The energy system utilizing hydrogen as fuel or energy carrier is expected to greatly reduce the emission of CO2, and various research and development is being conducted. In this project, an energy equipment system integrating the hydrogen technology and the superconductive technology, in which hydrogen is utilized in the form of liquid hydrogen also as extremely low temperature refrigerant, is developed as innovative low carbon technology. The superconductive electrical equipment with liquid hydrogen cooling is expected to be technology to improve the efficiency and to lower the CO2 emission in the system and are largely progressed. These include the superconductive power generator with liquid hydrogen cooling applicable for the power generation system utilizing the hydrogen turbine and the controlling system for electrical system in which the fuel battery and the super conductive energy storage such as SMES (Superconducting Magnetic Energy Storage) are combined as an energy storage device suppressing the output power fluctuations of the renewable energy.
Hence, focused on the superconductive coil with liquid hydrogen cooling at a technical level for equipment application, a project is conducted by organically cooperating the various technologies from the applicable low cost superconductive long-length superconductive wires based on MgB2 wires, REBCO superconductive wires and so on, to the cryogenic technology by liquid hydrogen and the equipment systems technology such as magnets and rotators, thereby accelerating the research and development for practical use.


Development of High Performance MgB2 Long Conductors

Hiroaki Kumakura
Senior Scientist With Special Missions, National Institute for Materials Science

Based on the development for MgB2 superconducting wires in the past ALCA project, we develop 100m-1km long class single-and multi-filamentary MgB2 superconducting wires applying an internal Mg diffusion process with the filaments composed of an intermediate B powder layer and an Mg core at the center. We investigate the prepared superconducting wires in detail, such as the microstructure of filaments and the local critical-current variations, and give feedback on the manufacturing process of superconducting wires. As such, we are aiming to develop a high-performance and low-cost MgB2 superconducting wire with the applicable level criticalcurrent property at the temperature of liquid hydrogen (20K) and at 5T in magnetic field. Further, long developed superconducting wires will be supplied to the Hamajima group and the Shirai group in ALCA Enabling Tech.

Development of high performance MgB2 long conductors A 100m-long class single core MgB2 superconducting wire having iron sheath (covering) has been manufactured. In the future, highly stable longitudinal MgB2 superconducting wire having copper (alloy) coating will be developed, based on the same technique.
Development of high performance MgB2long conductors Cross sectional photograph (prior to heat treatment) Diameter: 0.88 mm