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Recently, Wang Qiuliang’s research group at the Institute of Electrical Engineering of the Chinese Academy of Sciences adopted a self-developed high-temperature magnet technology to increase the central magnetic field of domestically produced Bi2223 interpolated magnets in the 15T back-field condition to 19 for the first time in China, effectively solving the domestic Bi-wires. With the problem of small critical tensile stress, the application range of domestic Bi strips has been extended to a high magnetic field of 19 T or more.
Compared with the low-temperature superconducting magnets, superconducting magnet having a high temperature operational stability, low-temperature systems are relatively simple and easy maintenance. Interpolating the current international magnet winding temperature based mainly Y and Bi-based tape, wherein the magnetic field interpolation Y-based tape produced can reach 26.8-35T, and Bi-based superconducting tape wound magnet may be Achieve 25T. However, the domestic Bi strips have not been used in a high magnetic field environment of 15T or more due to their small critical tensile stress, leading to the Bi- and Y-type strips used in domestic production of high-field interpolating magnets mainly relying on imports, and there is a lack of bargaining on wire procurement. right.
Wang Qiuliang’s research team took the lead in the development of high-field interpolated magnets using domestic Bi-based strips under the funding of the National Natural Science Foundation of China. The researchers used a special process to cure the internal stress layer of the strip to the outer layer and use a high-strength lashing method to make the maximum loop-proof stress inside the interpolated magnet reach 200 MPa, which effectively solved the domestic Bi. strip-based ultimate tensile stress of 100MPa technical problems only, to extend the range of application of the strip to a domestic Bi 19T or more high magnetic field.
The successful use of domestic Bi-type strips to achieve high magnetic fields above 19T indicates that China has reduced the reliance on imported conductors in the development of high-field interpolated magnets, and it also indicates that our country is more perfect in the development of high-field magnetic field process technology to achieve 25T. ~32T super high field superconducting magnets create the conditions.
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