On February 8th, the reporter learned from the Institute of Electrical Engineering of the Chinese Academy of Sciences that Wang Qiuliang's research group, with the support of the National Support Plan, adopted the multi-stage vibration isolation refrigerator vibration and separation of small cavity liquid helium liquefaction reflux technology to develop the first international Commercially cooled zero volatile liquid helium 400 MHz NMR spectrometer magnet system and 10 ~ 12T / 100mm high stability superconducting magnet system.
High-field and high-uniformity superconducting magnet systems have high requirements for magnetic field uniformity and vibration. Generally, a magnetic field uniformity of the order of 10 to 8 needs to be generated in the center area. In order to achieve high magnetic field uniformity, the system's Vibration is effectively restrained. Low temperature experiments on the above two sets of high-field and high-uniformity superconducting magnet systems show that the amplitude of the magnet system is reduced to 0.02 ~ 0.1mm when the magnetic field strength and uniformity generated by the superconducting magnet meet the design requirements. Level, fully meeting the rigorous requirements of magnetic field uniformity and vibration of superconducting magnets.
According to reports, currently China's liquid helium resources are mainly imported from the United States, and the two systems developed by the Institute of Electrical Engineering of the Chinese Academy of Sciences do not need to supplement liquid helium and zero-volatility high-field magnet technology. The development of a prototype of a stable superconducting magnet system will greatly reduce the dependence of superconducting magnets on liquid helium resources and will further expand the application field of superconducting magnets.