Photo courtesy of the Institute of Electrical Engineering, Chinese Academy of Sciences
On December 6, a reporter from the China Science News learned from the Institute of Electrical Engineering of the Chinese Academy of Sciences that the researcher and academician of the Chinese Academy of Sciences Wang Qiuliang's team used a self-developed high-temperature interpolated magnet technology to develop a central magnetic field of up to 32.35 T) Fully superconducting magnet. The magnet broke the world record of the 32.0T superconducting magnet created by the National Strong Magnetic Field Laboratory in December 2017, marking that China's high-field interpolating magnet technology has reached the world's leading level.
According to reports, the upper limit of the magnetic field strength generated by the low-temperature superconducting magnet is about 23.0T. The team used high and low temperature hybrid superconducting magnets to build magnets, that is, inserting high temperature superconducting magnets inside the coaxial structure of low temperature superconducting magnets, using high temperature superconducting tapes with high tensile strength and high magnetic field download density Advantages, the central magnetic field above 23.0T is generated.
At present, REBCO strips are commonly used in high-temperature interpolated magnets, but REBCO strips with a layered structure have the problems of weak interlayer bonding strength and being easily delaminated by huge electromagnetic stress under extremely high magnetic field conditions. , Seriously restricting the stability of the magnet operation. How to achieve breakthroughs in design theory and key processes has become the key to solving this problem.
The research team designed and built a brand-new superconducting coil and supporting structure on the basis of establishing and improving the electromagnetic-mechanical design theory and method of high-field interpolated magnets, which improved the overall engineering current density and local safety margin of the coil. The axial elastic support structure and the binding device are used to improve the ability of the superconducting joint to resist local tensile stress concentration. Through these improvements, the electromagnetic safety margin and stress safety margin of the extremely high field interpolated magnets have been greatly improved. (Zheng Jinwu)
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