ORALS

The discovery of high temperature superconducting (HTS) material in 1986 attracted considerable investments in material survey and its new application development. In particular, materials with a critical temperature higher than the liquid nitrogen boiling point encouraged HTS application in power transmission cables. In addition, successful trials using the test cable in a part of a civil power grid have been reported. However, the cost of using HTS cable is not yet competitive with that corresponding to conventional copper cables, and efforts to find HTS materials with better performance are ongoing. Nevertheless, studies on novel applications of HTS cable have been conducted, such as use of cables that can pass high electric current and generate magnetic field in its environment. Utilizing the information obtained in HTS power transmission projects, a large coil magnet set in a field with a free-form-design is still expected to encounter many new challenges, such as interference among assembled HTS conductor elements, electromagnetic force to be imposed on HTS conductors in the cable, cooling of HTS conductors in the long cable via refrigeration flow, and cost of HTS conductors. Considering these aspects, this study aims to present a concept of a seabed HTS coil for ship deperming.

References:
[1] Yamaguchi S. et al., "Construction and 1st Experiment of the 500-m and 1000-m DC Superconducting Power Cable in Ishikari", Phys. Procedia, 81 182-186, 2016. [2] Hirota M, "High Temperature Superconducting (HTS) Cable Application to Ship Deperming Work", J. Phys. Conf. Ser. 1559 012132(2020).