Development of 2 km-Class Carbon-Doped MgB2 Wire With Uniform Critical Current Property

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-03-04 DOI:10.1109/TASC.2026.3670799

Dong Gun Lee;Jun Hyuk Choi;Minoru Maeda;Seyong Choi;Jung Ho Kim

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Abstract

Kilometer-scale carbon-doped MgB₂ superconducting wires were fabricated using a three-dimensional vibrating powder-filling powder-in-tube process and systematically evaluated for uniformity and performance. The optimized process enabled fabrication of a 2.1 km-long 18-filament conductor with a critical current density (J_c) of 1.13 × 10⁵ A/cm² at 20 K and 2 T, showing only ∼2% variation along its length. Carbon substitution enhanced high-field performance primarily through impurity scattering, while the n-value demonstrated a strong proportionality with J_c across all measured conditions. This correlation establishes the n-value as not only a research parameter but also a practical quality-control metric for industrial wire production. The combined achievements of process innovation and transport uniformity highlight the feasibility of MgB₂ conductors for MRI magnets, high-field research magnets, and superconducting power transmission.

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具有均匀临界电流特性的2公里级掺碳MgB2导线的研制

采用三维振动粉末填充管内粉末工艺制备了千米尺度的掺杂碳MgB2超导导线，并对其均匀性和性能进行了系统评价。优化后的工艺使2.1 km长的18丝导体在20 K和2 T下的临界电流密度（Jc）为1.13 × 105 a /cm2，沿其长度仅显示约2%的变化。碳取代主要通过杂质散射增强高场性能，而在所有测量条件下，n值与Jc表现出很强的比例关系。这种相关性建立了n值不仅是一个研究参数，而且是工业线材生产的实际质量控制指标。工艺创新和传输均匀性的结合成果突出了MgB2导体在MRI磁体、高场研究磁体和超导电力传输方面的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Applied Superconductivity 工程技术-工程：电子与电气

CiteScore

3.50

自引率

33.30%

发文量

650

审稿时长

2.3 months

期刊介绍： IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.