Lao M, Hänisch J, Kauffmann-Weiss S, Gehring R, Fillinger H, Drechsler A, Holzapfel B
Institute of Technical Physics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Rev Sci Instrum. 2019 Jan;90(1):015106. doi: 10.1063/1.5078447.
A new state-of-the-art electrical transport measurement system was developed for the characterization of industrially produced coated conductors (CCs). The current leads are rated to a conduct current of up to 1000 A, which opens up the possibility of measuring the critical current I of tapes at a wide range of temperatures. The setup operates in a He-gas flow cryostat that provides stable temperatures between 1.8 and 200 K. The setup is equipped with a split-coil magnet that can apply fields of up to 6 T. A continuous rotation of the sample with respect to the magnetic field with an angular resolution of 0.5° enables characterization of anisotropic I of different tapes. In the measured voltage-current curves, weak sample heating mostly occurs from the dissipation in the tape during the I transition. It is demonstrated that the system can provide reliable data on the properties of CCs at temperatures lower than 77 K for a magnet design and other applications. The results allow the study of vortex pinning for further prospects of engineering the microstructure of the superconducting layer as well as to assess the performance of various tapes with different architectures to achieve optimum performance at different operating temperatures and magnetic fields.
为了表征工业生产的涂层导体（CCs），开发了一种全新的、技术先进的电输运测量系统。电流引线的额定传导电流高达1000 A，这使得在很宽的温度范围内测量带材的临界电流I成为可能。该装置在氦气流低温恒温器中运行，可提供1.8至200 K之间的稳定温度。该装置配备了一个分裂线圈磁体，可施加高达6 T的磁场。样品相对于磁场以0.5°的角分辨率连续旋转，能够表征不同带材的各向异性I。在测量的电压-电流曲线中，样品的微弱加热主要发生在I转变期间带材中的耗散过程中。结果表明，对于磁体设计和其他应用，该系统能够在低于77 K的温度下提供关于CCs特性的可靠数据。这些结果有助于研究涡旋钉扎，以进一步探索超导层微观结构工程的前景，以及评估具有不同结构的各种带材的性能，从而在不同的工作温度和磁场下实现最佳性能。
