Development of liquid hydrogen forced flow cooled CICC superconducting magnet

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02130
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Kyoto University
• Principal Investigator: Shirai Yasuyuki 京都大学, エネルギー科学研究科, 教授 (60179033)
• Co-Investigator(Kenkyū-buntansha): 岩本 晃史 核融合科学研究所, ヘリカル研究部, 准教授 (00260050) ; 今川 信作 核融合科学研究所, ヘリカル研究部, 教授 (10232604) ; 小林 弘明 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 特任准教授 (50353420)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 超電導マグネット / 液体水素 / 強制対流冷却 / 超電導導体

Outline of Final Research Achievements

High magnetic field and energy density superconducting magnet has been developed using high temperature superconducting wires such as ReBCO and BSCCO of high critical properties. These superconducting materials are desirable to be used in temperature range of 15~40 K for cooling stability with good electrical properties. Liquid hydrogen (LH2) is preferable coolant especially in forced flow cooling for superconducting cable in conduit conductor of with small viscosity.
However, there is less data for the cooling design of superconducting CICC die to its explosive feature.
In this research, in order to show the cooling stability of the LH2 forced flow cooling superconducting CICC, the model conduit conductor of MgB2/CuNi/CuNi and MgB2/Cu/CuNi twisted conductor were designed and made. The over current (larger than critical current of the superconducting wire) test was conducted and confirmed that the cooling stability was improved in the forced flow cooling of LH2.

Free Research Field

電気工学

Academic Significance and Societal Importance of the Research Achievements

液体水素の強制対流冷却を想定した超電導コンジット導体に関する研究は世界的にも例が少なく，実際に撚線導体を液体水素流路内に設置して超電導線材の臨界電流を超える通電を行った状態で，熱暴走を起こさず冷却安定性を保つことを示し，その大型超電導マグネットへの適用可能性を示した意義は大きい．