en.Wedoany.com Reported - China's Energy Singularity has successfully developed a nitrogen-free high-temperature superconducting insulated magnet, which recently passed three rounds of current testing, achieving central magnetic field strengths of 20 Tesla, 23.1 Tesla, and 26.7 Tesla, respectively. The magnet's design target is a central magnetic field strength of 25 Tesla. In the third round of testing, the magnet first operated stably at 25.5 Tesla, after which the magnetic field was increased to 26.7 Tesla. This achievement sets two world records: the highest magnetic field strength for a nitrogen-free high-temperature superconducting magnet, and the highest magnetic field strength for a high-temperature superconducting insulated magnet.
The magnet consists of 14 single-layer coils, with an outer diameter of 140 mm and a single-layer coil winding diameter of 30 mm, operating at an initial temperature of 6 Kelvin. The engineering current density of the winding exceeds 570 amperes per square millimeter, and the maximum internal magnetic field strength of the winding exceeds 27.5 Tesla. The magnet operates without the need for liquid helium, with cooling provided by a Gifford-McMahon cryocooler via thermal conduction. Additionally, the insulated structure significantly improves the excitation speed compared to non-insulated magnets, reaching 20 Tesla in just 16 minutes. This marks the world's first application of both an insulated structure and nitrogen-free operation in a high-temperature superconducting magnet with a magnetic field strength exceeding 20 Tesla.
The magnet will first be used in Energy Singularity's self-developed high-temperature superconducting material production and performance testing platform. Due to its insulated structure, which avoids the issue of magnetic field changes lagging behind current changes seen in non-insulated magnets, this magnet can also be applied in scenarios requiring high magnetic field uniformity, such as nuclear magnetic resonance (NMR) and comprehensive physical property measurement systems (PPMS).
This technological breakthrough signifies that China has reached an internationally leading level in the field of high-temperature superconducting magnets, providing new technical support for the industrial application of high-temperature superconducting materials and strong magnetic field scientific research.
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