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Evaluation of irradiation effects on microstructure and property of Ag-sheathed Bi-2212 superconducting round wire for future application in CFETR
Superconductor Science and Technology ( IF 3.7 ) Pub Date : 2020-10-08 , DOI: 10.1088/1361-6668/ab9521 Zuoguang Li 1 , Hongmei Zhu 1 , Changjun Qiu 1 , Dongsheng Yang 2 , Jinggang Qin 2 , Chao Zhou 2
Superconductor Science and Technology ( IF 3.7 ) Pub Date : 2020-10-08 , DOI: 10.1088/1361-6668/ab9521 Zuoguang Li 1 , Hongmei Zhu 1 , Changjun Qiu 1 , Dongsheng Yang 2 , Jinggang Qin 2 , Chao Zhou 2
Affiliation
Chinese Fusion Engineering Test Reactor (CFETR) is designed to build a fusion engineering Tokamak reactor with a fusion power of 200–1500 MW, and to test the breeding tritium during fusion reaction. This may require a maximum magnetic field up to 15 T in the Central Solenoid and Toroidal Field coils. New superconducting materials should be developed for satisfying the next-generation fusion reactors with critical requirements. Recently, Bi2Sr2CaCu2Ox (denoted as Bi-2212) is considered as one of the most potential superconductors as the magnets used in CFETR, however, will be subjected to the harsh irradiation under the operating conditions. The irradiation effects of the high-energy helium ions on the Ag-sheathed Bi-2212 superconducting round wire have been explored for the first time in this work. The microstructure and the critical current at 4.2 K of the superconducting wire before and after irradiation have been carefully investigated. Room-temperature X-ray diffraction (XRD) profiles showed that all the peaks shifted rightward significantly with broaden (111)Ag peak, indicating that the high-energy He+ irradiation resulted in appreciable defects and strain in the superconducting wire. Meanwhile, the in-situ high-temperature XRD tests showed that the lattice constant and the thermal expansion coefficient were deduced in the irradiated sample due to the presence of the generated defects. After irradiation, the grain size of the Ag sheath was refined, and the lattice of Bi-2212 superconductor was distorted obviously, as confirmed by transmission electronic microscopy (TEM). The critical current IC at 4.2 K of the superconducting wires in the field of 0-14T, determined by four-probe technique, was decreased substantially after irradiation because of the lattice distortion and the consequently induced strain in the Bi-2212 superconductor. This work provides a solid basis for evaluating and understanding the irradiation effects upon the Ag-sheathed Bi-2212 superconducting wire, more promising for future application in CFETR.
更新日期：2020-10-08
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