2023 Fiscal Year Final Research Report

Development of cryogenic conduction cooling conductor having a unique structure made by combination of heat pipe and very high purity aluminum

Research Project

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Project/Area Number	19K04848
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 24010:Aerospace engineering-related
Research Institution	The University of Tokyo (2021-2023) High Energy Accelerator Research Organization (2019-2020)
Principal Investigator	KIMURA Nobuhiro 東京大学, 宇宙線研究所, 特任専門員 (10249899)
Co-Investigator(Kenkyū-buntansha)	高田卓核融合科学研究所, 研究部, 助教 (30578109) 村上正秀筑波大学, システム情報系(名誉教授), 名誉教授 (40111588)
Project Period (FY)	2019-04-01 – 2024-03-31
Keywords	並列化極低温ヒートパイプ / ハイブリッド構造 / ドライアウト / 臨界温度 / 伝導冷却 / 超電導磁石
Outline of Final Research Achievements	The following results were obtained on the basic characteristics of low-temperature heat pipes containing working fluids with different critical temperatures, such as nitrogen gas, argon gas, and neon gas. The parallelization of the heat pipes containing different working fluids extended the working range, and demonstrated that the parallelized heat pipes were about 100 times better than the conductive cooling conductor made of high purity metal. The parallelization of working fluid with different critical temperatures can expand the working temperature range of heat pipes. Patent application was filed for the use of heat pipes containing working fluid in parallel. Demonstrated that the effective temperature range of a heat pipe can be expanded by arranging heat pipes (argon and nitrogen) containing different working fluids with different effective temperatures in parallel.
Free Research Field	超電導低温工学
Academic Significance and Societal Importance of the Research Achievements	本研究により、極低温ヒートパイプのドライアウト領域が優れた熱伝導特性を示し、且つ超伝導磁石等の予冷時間が短縮できることが示された。従来、ヒートパイプのドライアウト領域は熱伝導素子の性能領域外とされていたが、極低温ヒートパイプに限ってはヒートパイプのドライアウト領域においても優れた熱伝導特性を示した。これは極低温ヒートパイプを冷却に使用した超伝導磁石がその予冷に必要なエネルギーを軽減（省エネルギー硬貨）できることを意味する。