Fujikura is pleased to announce that it has played a role in the recent record-breaking performance of Tokamak Energy’s high‑temperature superconducting (HTS) magnet array system, Demo4. In recent tests, Demo4 produced field strengths of 11.8 Tesla at –243°C, with seven million ampere‑turns of electrical current circulating through the centre column. Fujikura’s proud contribution to this milestone is through the supply of 22km of specialised HTS tape used in the construction of Tokamak Energy’s precision‑wound HTS‑based coils.
Demo4 is a complete set of high temperature superconducting magnets built in a tokamak configuration and is the first tokamak‑relevant HTS magnet array to replicate fusion power plant magnetic field conditions. Demo4’s electromagnetic coils are wound from rare earth barium copper oxide (REBCO) superconducting material, which Fujikura’s is a world leading producer of.
Fujikura’s contribution to the project reinforces the company’s strategic commitment to advancing nuclear fusion as a clean, safe, and abundant energy source. Through sustained investment in cutting‑edge superconducting materials and manufacturing capability, Fujikura continues to support major European and global fusion programmes, helping accelerate the development of compact, efficient future power plants.
As a manufacturer of advanced technologies, Fujikura’s role in the Demo4 breakthrough underscores its position in the fusion supply chain. Fujikura is pleased to strengthen its support for European fusion initiatives while continuing to drive innovation in the development of high temperature superconductors.
Tokamak Energy’s Demo4 platform marks a decisive step toward commercial fusion, validating HTS technology at system level and demonstrating its potential across future power generation, industrial electrification, transport and scientific applications.
Read more about this story on Tokamak Energy’s website.
Click here to find out more about Fujikura high temperature superconductors.
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