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Clarification of current transport properties in YBCO coated conductors as a fundamental technology for power applications

阐明 YBCO 涂层导体的电流传输特性作为电力应用的基础技术

基本信息

批准号：
15360151
负责人：
KISS Takanobu
金额：
$ 9.41万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Current transport properties in YBCO coated high Tc superconducting (HTS) tapes have been investigated. Especially, we have succeeded for the first time to visualize flux flow dissipation under high magnetic field up to 5 T by developing novel high field type low temperature laser scanning microscope system (HF-LTLSM). It has been shown that the localized resistive region percolates into the sample as the bias current density is increased. We have also developed current visualization technique based on magnetic imaging by scanning SQUID microscopy (SSM). High sensitive magnetic imaging by variable temperature SSM allows us to estimate sheet current density in the superconducting layer. Combination of those measurements leads deep insights into current limiting mechanism in the coated conductor. Our results show that non-uniform current flow due to spatially distributed obstacles is responsible for the critical current, Ic, observed in macroscopic length scale, whereas grain connectivity in each YBCO grains is not the limiting factor. Typical period of those obstacles is several tens μm to hundreds μm. The relationship between local Ic distribution and global transport properties has also been investigated. Based on the local measurements as well as theoretical consideration, we developed a model to describe analytically the global current-voltage characteristics in the conductors. It allows us to predict the current carrying properties over broad conditions of temperature, magnetic field and electric field. The accuracy of the extrapolation has been verified experimentally in magnetic fields up to around 30 T. Those results are relevant as fundamental technologies for practical power applications of HTS based devices.

研究了YBCO涂层高温超导带材的电流输运特性。特别是，我们已经成功地为第一次可视化磁通量流耗散下的高磁场高达5 T的开发新的高场型低温激光扫描显微镜系统（HF-LTLSM）。结果表明，随着偏置电流密度的增加，局部电阻区扩展到样品中。我们还开发了基于扫描SQUID显微镜（SSM）磁成像的电流可视化技术。变温SSM的高灵敏度磁成像使我们能够估计超导层中的片电流密度。这些测量的组合导致对涂层导体中的电流限制机制的深刻见解。我们的研究结果表明，由于空间分布的障碍物的不均匀的电流流动是负责的临界电流，Ic，在宏观长度尺度上观察到的，而在每个YBCO晶粒的晶粒连通性不是限制因素。这些障碍物的典型周期是几十μm到几百μm。局部Ic分布和全局输运性质之间的关系也进行了研究。基于局部测量以及理论考虑，我们开发了一个模型来描述解析的全球电流-电压特性的导体。它使我们能够预测在温度，磁场和电场的广泛条件下的载流特性。外推的准确性已在高达约30 T的磁场中得到实验验证。这些结果是相关的高温超导器件的实际功率应用的基础技术。

项目成果

期刊论文数量（43）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Study on local inhomogeneity in TFA-MOD YBCO coated conductors by low temperature scanning laser microscopy

低温扫描激光显微镜研究 TFA-MOD YBCO 涂层导体的局部不均匀性

DOI：
发表时间：
2005
期刊：
Physica C : Superconductivity (In press)
影响因子：
0
作者：
Junya Sekikawa;Takayoshi Kobono;M.Inoue et al.
通讯作者：
M.Inoue et al.

超電導線材及びそれを用いた超電導コイル

超导线材及使用其的超导线圈

DOI：
发表时间：
2003
期刊：
影响因子：
0
作者：
通讯作者：

T.Kiss et al.: "Spatially resolved measurements of dissipative state in HTS tapes and films by low temperature scanning laser microscopy(invited)"Extended Abstract of 11th Japan-US Workshop on High-Tc Superconductors. 24-25 (2003)

T.Kiss等人：“通过低温扫描激光显微镜对高温超导带和薄膜中的耗散态进行空间分辨测量（特邀）”第11届日美高温超导体研讨会的扩展摘要。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Imaging of trapped vortices in YBCO coated conductors by scanning SQUID microscopy

通过扫描 SQUID 显微镜对 YBCO 涂层导体中的陷涡进行成像

DOI：
发表时间：
2005
期刊：
Physica C 426-431
影响因子：
0
作者：
M.Hayashibe;N.Suzuki;N.Nakata;A.Hattori;K.Konishi;M.Hashizume;奥井登志子;井上昌睦他;K.Koyanagi et al.;M.Inoue et al.
通讯作者：
M.Inoue et al.

Spatially resolved measurements of flux flow dissipation in YBCO coated conductors under the influence of external magnetic field

在外部磁场影响下 YBCO 涂层导体中磁通量耗散的空间分辨测量