Study on three-dimensional flux dynamics in bulk superconductor for improving its magnetization performance

体超导体三维磁通动力学研究以改善其磁化性能

• 批准号: 17360136
• 负责人: OHSAKI Hiroyuki
• 金额: $ 7.81万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360136/
• 关键词: superconductivity; bulk; flux motion; magnetization; numerical analysis; coupled analysis; 超伝導; 錬成解析

RE-Ba-Cu-O bulk superconductor has the good flux-pinning property and is expected to be applied as a high flux source. For such an application the pulsed field magnetization is an important technique and its performance improvement is required. This study aims at examining flux dynamics during the pulsed field magnetization process, clarifying flux motion and induced current distribution when a pulse magnetic field is applied to bulk superconductor with spatially inhomogeneous superconducting properties, and considering performance improvement of pulsed field magnetization. Both experiments and numerical analysis were carried out.In the experiments search coils and a hall probe were used to measure the variation of flux density distribution during the pulsed field magnetization and the resultant trapped flux density distribution. The results have clarified the relation between the flux density distribution and the applied magnetic fields. For numerical analysis, a analysis tool for axi … More symmetric three-dimensional coupled problems of electromagnetic and temperature fields has been developed with the voltage-current characteristics of bulk superconductor and the dependence of its critical current density on magnetic flux density and temperature taken into account under the cooling conditions of immersion cooling by liquid nitrogen and conduction cooling by a cryocooler. In addition full three-dimensional analysis was also carried out and discussed for several cases. With these analysis tools and models the numerical analysis of pulsed field magnetization process of bulk superconductor were performed under the various conditions. The analysis results qualitatively agreed with experimental results, and indicate that the analysis tools and models can be used for the detailed analysis of electromagnetic phenomena and temperature distribution in the superconductor.From these experimental and analysis results the flux motion and dynamics in bulk superconductor during pulsed field magnetization has been discussed and clarified. Less

项目成果

Multipoint Measurements of Transient Flux Motion on Bulk Superconductor During Pulsed Field Magnetization

脉冲场磁化过程中体超导体瞬态磁通运动的多点测量

• 发表时间: 2007
• 期刊: IEEE Transactions on Applied Superconductivity Vol.17, No.2
• 作者: R. Shiraishi;H. Ohsaki
• 通讯作者: H. Ohsaki

Flux Dynamics in Inhomogeneous Bulk Superconductor During Pulsed Field Magnetization

• DOI: 10.1109/tasc.2005.864280
• 发表时间: 2006-06
• 期刊: IEEE Transactions on Applied Superconductivity
• 影响因子: 1.8
• 作者: R. Shiraishi;H. Ohsaki

Macroscopic magnetic flux motion in Y-Ba-Cu-O bulk superconductor during pulsed field magnetization

Y-Ba-Cu-O块体超导体在脉冲场磁化过程中的宏观磁通量运动

• 发表时间: 2005
• 期刊: IEEE Transactions on Applied Superconductivity 15・2
• 作者: Ryosuke Shiraishi;Hiroyuki Ohsaki;K.Fujiyama;R.Shiraishi
• 通讯作者: R.Shiraishi

Multipoint Measurements of Transient Flux Motion on Bulk Supercondutor During Pilsed Field Magnetization

体超导体在激磁场磁化过程中瞬态磁通运动的多点测量

• 发表时间: 2007
• 期刊: IEEE Transactions on Applied Superconductivity 17・2
• 作者: 山内義一;千葉明;深尾正;R.Shiraishi
• 通讯作者: R.Shiraishi

Influence of local superconducting properties on pulsed field magnetization of YBCO bulk superconductor

局域超导特性对YBCO体超导体脉冲场磁化强度的影响

• 发表时间: 2005
• 期刊: Physica C 426-431・1
• 作者: Ryosuke Shiraishi;Hiroyuki Ohsaki;K.Fujiyama
• 通讯作者: K.Fujiyama