Heat Treatment for Bi-2212 CICC-Type Insert Coil

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Abstract
A heat treatment system, which is used in combination with a stepwise heat treatment method, has been constructed at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP) for the primary Bi-2212 (Bi2Sr2CaCu2Ox) CICC (cable-in-conduit conductors)-type high-field insert coil. The design and manufacturing of the first Bi-2212 CICC-type insert coil has been completed. Prior to the final heat treatment for the CICC-type coil, a validation experiment is required to demonstrate the effectiveness and feasibility of the system and method. The validation experiment was concluded with the implementation of a heat treatment process on the model coil and the witness samples. In the course of the validation experiment, the various parameters of the heat treatment process – including temperature, pressure and oxygen content – were subjected to meticulous monitoring by a range of measuring instruments. The temperature evolution and uniformity of the process meet the technical requirements of the heat treatment process for the Bi-2212 CICC-type coil. It is evident that the critical performance of the witness samples meets the requisite value. The results of the study demonstrate the efficacy and feasibility of the system and method of heat treatment employed in the final heat-treatment process of the first Bi-2212 CICC-type coil. Consequently, the concluding phase of the heat treatment process was initiated on the inaugural Bi-2212 CICC-type insert coil. It is evident from the findings of the experiment that the coil displays a critical current of 5.4 kA at 4.2 K and 20 T background field, thus indicating its superior capacity. The success of the heat treatment for the first Bi-2212 CICC-type coil establishes a solid foundation for the heat treatment of the future large-scale and full-size Bi-2212 cable-in-conduit conductor.
Funding Information
  • Comprehensive Research Facility for Fusion Technology Program of China (2018-000052-73-01-001228)
  • Science Foundation of Institute of Plasma Physics
  • Chinese Academy of Sciences (DSJJ-2025-02)
  • China Postdoctoral Science Foundation-Anhui Joint Support Program (2025T013AH)
  • Postdocoral Fellowship Program of China Postdoctoral science foundation (GZC20250617)
  • National Key R&D Program of China (2022YFE03150200)
  • Natural Science Foundation of Anhui Province (2408085J030)
  • Youth Innovation Promotion Association of CAS (2021444)
  • National Natural Science Foundation of China (52507037)

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