Abstract
High-temperature superconducting (HTS) systems that harness the cold energy of liquid hydrogen have the potential to reduce CO2 emissions. We have begun research and development of liquid-hydrogen-cooled HTS coils and are planning to verify the stability of REBCO coils immersed in liquid hydrogen in the region above the critical current to obtain a cooling design guideline. A split-type field coil with a magnetic field applied to the test coil was designed and manufactured. The field coil comprised eight stacked single-pancake coils made of 4 mm wide REBCO wires. The inner diameter of the single pancake coil was 130 mm, outer diameter was 206 mm, and number of turns was 220–230. When conducting stability limit tests, the upper and lower coils are energized with the current in opposite directions. When conducting fault current tests, a test coil with a few turns is short-circuited and the field coil current should flow in the same direction. This current transformation method enables overcurrent tests several to several dozen times the critical current. The manufactured field coil was energized in liquid nitrogen. The measured and simulated I-V waveforms are in good agreement, and it is concluded that there are no problems in the design and fabrication of the field coil. We will conduct a liquid hydrogen test after a preliminary energization test of the field coil in liquid helium.
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Acknowledgments
This work is based on results obtained from a project, JPNP20004, subsidized by the New Energy and Industrial Technology Development Organization (NEDO).
We would like to thank Editage (www.editage.com) for English language editing.
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Ohya, M. et al. (2023). Preliminary Excitation Test of REBCO External Magnetic Field Coil in Liquid Nitrogen. In: Qiu, L., Wang, K., Ma, Y. (eds) Proceedings of the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022. ICEC28-ICMC 2022. Advanced Topics in Science and Technology in China, vol 70. Springer, Singapore. https://doi.org/10.1007/978-981-99-6128-3_146
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DOI: https://doi.org/10.1007/978-981-99-6128-3_146
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