Helical Fusion publishes peer-reviewed HTS magnet study for fusion reactors

Helical Fusion says a peer-reviewed paper now formally documents 2025 test results for its proprietary HTS conductor, UROCOIC, after joint evaluation with Japan’s National Institute for Fusion Science. The publication adds scientific validation to a key magnet milestone for the company’s Helix Program and its plans for a demonstration device and future power plant.

Why it matters: - Helical Fusion’s published results add peer-reviewed validation to a core technology needed for commercially viable fusion power. - The paper gives the wider fusion research community access to test data from a conductor designed for reactor-scale high-temperature superconducting magnets. - The work supports Helical Fusion’s roadmap from its Integrated Demonstration Device, Helix HARUKA, to its planned power plant, Helix KANATA.

What happened: - Helical Fusion announced publication of a peer-reviewed paper in the Journal of Physics: Conference Series. - The paper covers validation of UROCOIC, the company’s proprietary HTS conductor for Helical Stellarator magnets. - The study was presented at the 38th International Symposium on Superconductivity in 2025 before publication in the journal. - A specialized Japanese manufacturing partner built the test coil. - Researchers evaluated the coil through joint work with the National Institute for Fusion Science.

The details: - The paper reports cryogenic testing of a double-pancake coil wound with UROCOIC. - Test conditions ranged from 10 K to 30 K, with an initial temperature of 10 K. - The coil operated stably at 40 kA under a 7 T external magnetic field without quench. - The coil experienced local magnetic fields up to 8.9 T. - The setup withstood electromagnetic forces of 356 kN/m. - The coil also showed robust no-insulation performance during abrupt magnetic-field changes. - Helical Fusion says the results satisfy conditions needed to advance toward demonstration in Helix HARUKA. - The conductor is being developed for both Helix HARUKA and Helix KANATA. - The paper is titled “Experiment of a Double-Pancake Coil Wound by UROCOIC Conductor for Application in Helical Fusion Reactors.” - Yoshiro Narushima of the HF Joint Research Group at NIFS and SOKENDAI is the first author. - The paper is available in the Journal of Physics: Conference Series from IOP Publishing. - A related earlier paper on the U-shaped WISE conductor was published in Plasma and Fusion Research. Read the earlier paper - The new paper is available online. Read the published study - Helical Fusion also linked a related release. Related release

Between the lines: - Peer review does not change the test results, but it does raise the credibility of the data by placing them in the scientific literature. - The collaboration with NIFS and a Japanese industrial partner shows the company is trying to pair proprietary design work with established research and manufacturing capacity. - The publication helps turn an engineering announcement into a documented reference point for future HTS magnet development.

What’s next: - Helical Fusion plans to use the conductor and related magnet work in Helix HARUKA, its integrated demonstration device. - The company aims to move from demonstration hardware toward Helix KANATA, its first commercially viable fusion power plant. - Helical Fusion says the Helix Program is targeting commercial operation in the 2030s. - The conductor development is continuing under Japan’s MEXT SBIR Phase 3 program. - The project has also passed its Stage-Gate Review, clearing another government support checkpoint.

The bottom line: - The publication turns a 2025 magnet test into a peer-reviewed benchmark for Helical Fusion’s fusion reactor roadmap.