Ma Hongjun, Liu Huajun, Liu Fang, Zhang Huahui, Ci Lu, Shi Yi, Lei Lei
Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
Rev Sci Instrum. 2018 Jan;89(1):015102. doi: 10.1063/1.4996057.
High-Temperature Superconductors (HTS) are potential materials for high-field magnets, low-loss transmission cables, and Superconducting Magnetic Energy Storage (SMES) due to their high upper critical magnetic field (H) and critical temperature (T). The critical current (I) of HTS, which is one of the most important parameters for superconductor application, depends strongly on the magnetic fields and temperatures. A new I measurement system that can carry out accurate I measurement for HTS short samples with various temperatures (4.2-80 K), magnetic fields (0-14 T), and angles of the magnetic field (0°-90°) has been developed. The I measurement system mainly consists of a measurement holder, temperature-control system, background magnet, test cryostat, data acquisition system, and DC power supply. The accuracy of temperature control is better than ±0.1 K over the 20-80 K range and ±0.05 K when measured below 20 K. The maximum current is over 1000 A with a measurement uncertainty of 1%. The system had been successfully used for YBaCuO(YBCO) tapes I determination with different temperatures and magnetic fields.
高温超导体（HTS）因其较高的上临界磁场（H）和临界温度（T），是用于高场磁体、低损耗传输电缆和超导磁储能（SMES）的潜在材料。高温超导体的临界电流（I）是超导体应用中最重要的参数之一，它强烈依赖于磁场和温度。已开发出一种新的I测量系统，该系统能够对不同温度（4.2 - 80K）、磁场（0 - 14T）以及磁场角度（0° - 90°）的高温超导短样品进行精确的I测量。该I测量系统主要由测量支架、温度控制系统、背景磁体、测试低温恒温器、数据采集系统和直流电源组成。在20 - 80K范围内，温度控制精度优于±0.1K，在低于20K测量时精度优于±0.05K。最大电流超过1000A，测量不确定度为1%。该系统已成功用于不同温度和磁场下钇钡铜氧（YBCO）带材的I测定。
