Speaker
Description
HTS high field magnets are one of the technological enablers for medical research, high energy physics, and more recently fusion energy. Especially, recent increasing public interests in the HTS fusion magnets prompt full cross-cutting understanding at all levels of technologies such as the HTS materials, conductors, cables and magnets. No magnet can be better than the conductor, but it is also true that there are unique technological challenges for using HTS in the high field applications because there are still many “missing links” between the conductor technologies and cable/magnet technologies, and most of them are derived from the structure-related property variabilities. The coated conductor (CC) is currently the most dominant HTS, and there are 7 manufacturers worldwide. But their geometry of thin tape ribbon inevitably makes them anisotropic in the superconducting and mechanical properties. Concerning the superconducting anisotropy, our multi-facet testing revealed significant variabilities of Jc (θ, T, H) between different CCs that largely depend on temperature and field and the pinning nanostructure. Also, the field angle which produces the highest Je can be variable not only between the manufacturers but also between the production batches or along the length of each CCs. For the high field magnets, the delamination-induced fracture is a serious issue under high field operations. In addition to pre-existing mechanical damage caused by slitting, our recent nanostructure analysis indicated a strong variability in the buffer layer integrity between the production batches and potentially between the manufacturers. This presentation will discuss further such recent multi-faceted assessments of structural correlations to the coated conductor property variabilities.
| Session | Conductor Material Research |
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