Yu Cheng (a second-year doctoral student) of the Kohama Group, Institute for Solid State Physics, the University of Tokyo, has received the FY2026 Outstanding Presentation Award from the Cryogenics and Superconductivity Society of Japan (CSSJ). This award is given to young members of the Society (full or student members who are 35 years old or younger as of the end of the fiscal year of their presentation and who have not received a presentation award in the preceding five years) who have given an outstanding presentation at the CSSJ Annual Meeting, regardless of whether the presentation is oral or poster. Mr. Yu received the award on June 3 for his poster presentation at the 111th Annual Meeting of the Cryogenics and Superconductivity Society of Japan (Spring 2026), held from June 2 to 4, 2026, at the Yokohama Port Opening Memorial Hall (Yokohama, Kanagawa).

The title of the award-winning presentation is “Trapping Magnetic Field in Tubular Stacked Coated Superconductors.”

High temperature cuprate superconductors (RE)Ba₂Cu₃O₇ (RE: rare earth elements) with large critical current density (Jc) under high magnetic fields as compared with other superconductors are expected to be promising materials for applications such as superconducting magnets and transmission lines. Intensive research has been carried out by several groups on trapping high magnetic fields in stacked coated conductors (CCs), and the maximum trapped field record of 17.89 T was achieved in 2022. In the present study, a hole was drilled in the center of the stacked CCs to utilize the trapped field inside them and to provide a large, stable, and homogeneous magnetic field environment for a sample. To estimate the value of the trapped field at the center and its temporal stability, measurements using Hall probes during the field-cooling process starting from 9 T and relaxation process were performed. A magnetic field very close to 9 T (8.987 T) was successfully trapped at the center of the stacked CCs at 6 K. Very weak relaxation was also realized 1 h after the field-trapping process (0.01% decrease) by decreasing temperature quickly right after the field-trapping experiment. In addition, a home-made probe was used for measuring the z-axis profile of the trapped field. As a result, field homogeneity ΔB/B as small as 0.05%/mm was achieved.

The award was given in recognition of this presentation.

Publication

• “Magnetic field trapping in a tubular stack of coated conductors” Supercond. Sci. Technol. 38, 085004 (2025).

Related page

• Cryogenics and Superconductivity Society of Japan
• The 111th Annual Meeting of the Cryogenics and Superconductivity Society of Japan (Spring 2026)
• Kohama Group, ISSP, the University of Tokyo