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BEPCII has two sets of cryogenic superconducting devices, namely superconducting high frequency cavities and superconducting magnets. The superconducting high-frequency cavity system was officially put into operation last year. At present, the work is stable and meets the design requirements. According to the plan, the joint excitation of three superconducting magnets should be realized in June this year, and detailed magnetic field measurement work should be started.
BEPCII's three superconducting magnets are: large Beijing spectrometer superconducting solenoid magnet, 4.91 meters long, 3.4 meters in diameter, excitation current is 3370 amps, field strength is 10,000 gauss, 20,000 times the earth's magnetic field, The maximum energy storage capacity is 10 million joules. This is the largest single superconducting magnet developed by China. Two superconducting insert magnets are extremely complicated in design. There are 7 superconducting coils with different functions on the same magnet. One of the most complex superconducting insertion magnets in the world, one of which has a maximum excitation current of 1300 amps and a magnetic field of 28,000 gauss.
Luo Xiaoan, director of the Office of Major Reconstruction Engineering of the Beijing Electron-Positron Collider, said that when the collider is working, two superconducting insertion magnets are inside the superconducting solenoid magnet, and the electromagnetic force between the three superconducting magnets is greater than 1 ton. The joint work is difficult and demanding. After repeated trials, the scientific research engineers realized the joint excitation of three superconducting magnets, and the working current reached and exceeded the design index, and made breakthrough progress.
The reporter recently learned from the Institute of High Energy Physics of the Chinese Academy of Sciences that the three superconducting magnets combined excitation excitation of the Beijing Negative Electron Collider Major Retrofit Project (BEPCII) was successful. This marks a major breakthrough in China's accelerator cryogenic superconducting technology, indicating that Chinese engineers have mastered the accelerator low-temperature superconducting technology and are fully capable of designing and manufacturing large-scale low-temperature superconducting magnets.