Status of MgB2 superconducting wires at Sam Dong

In recent years, newly developed energy systems have come into widespread use in our daily lives.

byJun Hyuk Choi et al.

78 Status of MgB2 superconducting wires at Sam Dong
  1. Introduction

In recent years, newly developed energy systems have come into widespread use in our daily lives. More energy-efficient solutions with ecological adaptation have also been prioritized towards sustainable societies.

Since 2001, with the discovery of superconductivity, magnesium diboride (MgB2) has been considered the most promising candidate in terms of cryogen-free operation, replacing conventional low-temperature superconductors, niobium titanium (NbTi) and niobium tin (Nb3Sn), because of the relatively high critical temperature of 40 K [1]. In particular, MgB2 composite conductors are capable of enormous current flow in direct or alternating current operation without Joule heating or with small losses, respectively. In a dry cryostat (i.e., Gifford-McMahon cryocooler), the superior features offer potential for the creation of new innovative technologies.

In fact, MgB2 superconducting applications have now moved beyond the research stages into prototypes and commercial products. When compared to conventional superconducting wires, NbTi and Nb3Sn, which have been produced and used worldwide, there are, however, still impediments to the availability of structural varieties in multifilamentary forms for long-length conductors. The immature and limited manufacturing technology is a major barrier to utilization in much wider practical applications. In this article, we report customized manufacturing systems for various multifilamentary conductors and introduce the MgB2 wire products that have been developed so far at Sam Dong Co., Ltd.

 

  1. The Sam Dong MgB2 wires

2.1 Customized manufacturing and evaluation systems

Sam Dong Co., Ltd. (hereafter, Sam Dong) [2], Republic of Korea, was established in 1977 to produce oxygen-free high conductivity (OFHC) copper (Cu), continuously transposed conductor (CTC), copper strip, various copper shapes, and insulated rectangular and round wires (enamel, paper, glass yarn, etc.). Sam Dong has also established entities in Tennessee and Ohio in the USA and Kostrzyn nad Odra, Poland, to meet overseas customers’ demands efficiently. Thus, our company is supplying the highest quality products and services for heavy industries in North and South America, Europe, Asia, and Oceania.

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