Electromagnetic properties of the new conductor, with controlled twist angles, developed to break the existing upper limit of superconducting coil performance and optimization of its design

新型导体的电磁特性，具有受控的扭转角，旨在突破现有的超导线圈性能上限并优化其设计

• 批准号: 17360128
• 负责人: SUMIYOSHI Fumio
• 金额: $ 9.57万
• 依托单位: Kagoshima University
• 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 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360128/
• 关键词: superconducting coil; tape; conductor; electromagnetic property; ac loss; critical current; MgB_2; NbTi; 高温超伝導; 低温超伝導; 線材; コイル; 損失; 通電特性; 電磁特牲; 電力機器

The purpose of this study is to contribute to realise the superconducting devices by clarifying the fundamental electromagnetic properties of the new superconducting conductor, with controlled twist angles, developed to break the existing performance limit of superconducting coils. The results of this study are as follows: (1) It was actually shown that NbTi/Cu monolithic conductors with high aspect ratio of cross-sections have the expected high performances (2) The design method to increase the performances of the conductors by increasing its aspect ratio of cross-section was applied to MgB_2, which has the high critical temperature of about 39K and it was actually shown that the performances of MgB_2 tapes increase. (3) In order to increase the performances of the superconducting coil wound with the tape conductors, the new design method of the coil was proposed. The value of this method was theoretically shown. (4) The transposed parallel cable composed of Bi-2223 tapes (high temperature superconducting tapes) was taken from the test conductor of CIC type conductors. The distributions of local voltages along the cable axis were measured. As a result, the causes of observation of decreasing the critical currents on the conductors were clarified. (5) The fabrication of the current transformer with current capacities of 1kA class was finished to evaluate the electromagnetic properties of high temperature superconducting large conductors. Moreover, the amplitude of ac transport currents in the 2nd circuit of current transformer was achieved to 880 A. The ac losses in the round-trip conductors were measured by Poynting vector method. The validity of the measuring system was actually shown.

本研究的目的是有助于实现超导装置澄清的基本电磁性能的新的超导导体，控制扭转角，开发打破现有的性能限制的超导线圈。本研究的结果如下：（1）实验结果表明，具有大截面长径比的NbTi/Cu单块导体具有预期的高性能。（2）将通过增大截面长径比来提高导体性能的设计方法应用于MgB_2，其临界温度约为39 K，实际上表明MgB_2带材的性能得到了提高。(3)为了提高绕制超导线圈的性能，提出了一种新的绕制超导线圈的设计方法。从理论上证明了该方法的实用价值。(4)由Bi-2223带材（高温超导带材）组成的换位平行电缆取自CIC型导体的试验导体。测量了局部电压沿着电缆轴线的分布。结果，澄清了观察到导体上的临界电流降低的原因。(5)为评价高温超导大导体的电磁性能，研制了电流容量为1 kA级的电流互感器Transformer。此外，电流互感器Transformer的第二回路中的交流传输电流的幅度达到880 A。用坡印亭矢量法测量了往返导线的交流损耗。实际应用表明了该测量系统的有效性。

项目成果

The Evaluation of Stability Margin of a Conduction-Cooled LTS Pulse Coil

传导冷却LTS脉冲线圈稳定裕度的评估

• 发表时间: 2006
• 作者: Akifumi;Kawagoe
• 通讯作者: Kawagoe

Development of Nb Ti monolithic conductors with high aspect ratio of cross-sections

高截面铌钛整体导体的开发

• 发表时间: 2006
• 作者: Akihiro;Jikuzono
• 通讯作者: Jikuzono

AC loss properties of coils wound with YBCO coated conductors using Ni-W substrates

使用 Ni-W 基板绕制 YBCO 涂层导体的线圈的交流损耗特性

• 发表时间: 2006
• 作者: Misa;Owa
• 通讯作者: Owa

AC loss properties of a conduction cooled LTS pulse coil

传导冷却 LTS 脉冲线圈的交流损耗特性

• 发表时间: 2005
• 作者: Akifumi;Kawagoe
• 通讯作者: Kawagoe

Measurement of AC Current Distributions in Three HTS Tapes Arranged in Parallel

并联排列的三个高温超导带中交流电流分布的测量

• 发表时间: 2007
• 期刊: IEEE Trans.Appl.Supercond. 17-2
• 作者: Shuma;Kawabata;Akifumi Kawagoe;Shuma Kawabata;Akifumi Kawagoe;Toshiyuki Mito;Fumio Sumiyoshi;Shuma Kawabata
• 通讯作者: Shuma Kawabata