Development of 30 T Repeating Pulsed Field

30T重复脉冲场的研制

• 批准号: 10554013
• 负责人: NOJIRI Hiroyuki
• 金额: $ 4.29万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10554013/
• 关键词: High Magnetic Fields; Neutron Scattering; Phase Transition

A repeating pulsed field system has been developed for the neutron diffraction experiments in high magnetic fields. Magnetic fields as high as 30 T can be generated by using the present system. Magnetic fields above 25 T have not been obtained by way of a superconducting magnet. Therefore, the present field intensity is the highest field for neutron diffraction in the world. As the magnet, 3-layer Bitter type magnet is used. The use of the 3-layer structure improves the electric and mechanical contacts between the adjacent layers and the loge life-time of magnet is achieved.As the first test of the neutron diffraction experiments above 25 T, we have investigated the metamagnetic phase transition in a triangular lattice anti-ferromagnet CuFeO2. The change of the magnetic structure from the incommensurate to the commensurate structure was found around 20 T. The neutron diffraction experiments in Dy Cu was also made and the nature of metamagentic transition was investigated. The present results have established the feasibility of the neutron diffraction experiments in very high fields above 20 T by using a repeating pulsed magnetic field system.

本文介绍了一种用于强磁场中子衍射实验的重复脉冲场系统。通过使用本系统可以产生高达30 T的磁场。通过超导磁体还没有获得超过25 T的磁场。因此，目前的场强是世界上中子衍射的最高场强。作为磁体，使用3层Bitter型磁体。作为25T以上中子衍射实验的第一个测试，我们研究了三角晶格反铁磁体CuFeO_2的变磁相变。在20 T附近发现了磁结构由无公度结构向公度结构的转变。还进行了Dy Cu的中子衍射实验，研究了变磁相变的本质。本文的结果证实了利用重复脉冲磁场系统进行20 T以上强磁场中子衍射实验的可行性。

项目成果

H. Nojiri et al.: "30 T Repeating Pulsed Field System for Neutron Diffraction"IEEE. Trans. Mag.. (in print). (2000)

H. Nojiri 等人：“用于中子衍射的 30 T 重复脉冲场系统”IEEE。

H.Nojiri: "Neutron Diffraction Experiments in Repeating Pulsed High Magnetic Fields." Physica B. 246-247. 175-178 (1998)

H.Nojiri：“重复脉冲高磁场中的中子衍射实验。”

H.Nojiri et al.: "Neutron diffraction Experiments in Repeating Pulsed High Magnetic Field"Physica B. 246-247. 175-178 (1998)

H.Nojiri 等人：“重复脉冲高磁场中的中子衍射实验”Physica B.246-247。

H.Nojiri et al.: "25T Repeating Pulsed Magnetic Field System for Neutron Diffraction Experiments"Physica B. 241-243. 210-212 (1998)

H.Nojiri 等人：“用于中子衍射实验的 25T 重复脉冲磁场系统”Physica B.241-243。

本河光博, 三浦登編集: "実験物理学講座 基礎技術II 第3章"丸善. 11 (1999)

本川光宏、三浦升主编：《实验物理课程基础技术II第3章》丸善11（1999）。