T/CES 046-2020 High-temperature superconducting tape magnetization critical current uniformity magnetic circuit method testing system specification

Scope

Scope: This standard specifies the terms and definitions, basic requirements, and performance characteristics of the magnetic circuit method test system for the uniformity of the magnetization critical current of high-temperature superconducting tapes, and describes the corresponding test methods. The system specified by this standard is applicable to testing the uniformity of the magnetization critical current of first-generation high-temperature superconducting tapes (Bi-2223) and second-generation high-temperature superconducting tapes (REBCO coated conductors) with a superconducting critical temperature above the liquid nitrogen temperature range. During the test, the tapes are cooled by direct immersion in liquid nitrogen. Main technical content: High-temperature superconducting tapes represented by bismuth strontium calcium copper oxide (BSCCO) and yttrium barium copper oxide (YBCO) have entered the stage of large-scale production, with the length of a single tape reaching hundreds of meters or even thousands of meters. Due to the intrinsic ceramic characteristics of high-temperature superconducting materials and complex production processes, defects are unavoidable during production and use, making it essential to conduct critical current uniformity testing on superconducting tapes. Critical current can be divided into two types: transmission critical current and magnetization critical current. Transmission critical current is the critical value at which a superconducting tape can actually carry current, while magnetization critical current is the critical value of the residual magnetization current after a superconducting tape is completely penetrated by a magnetic field. Currently, there are two main types of critical current uniformity testing methods for superconducting tapes: contact method and non-contact method. Among them, the contact method measures the transmission critical current of superconducting tapes mainly by using the traditional four-lead

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