Permanent magnet system of alpha magnetic spectrometer

• Published in: Science China. Mathematics Vol. 43; no. 9; pp. 996 - 1008
• Main Author: Chen, Hesheng
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01.09.2000; Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
• Subjects: Dipole moments; Launch vehicles; Launching; Magnetic fields; Permanent magnets; permanent magnet; magic ring; particle physics experiment in space; magnetic spectrometer; mechanical structure in space
• ISSN: 1006-9283; 1674-7283; 1862-2763; 1869-1862
• DOI: 10.1007/BF02879806

Alpha magnetic spectrometer (AMS) is the first large magndtic spectrometer in space. Its precursor flioht was completed successfully in June 1998. The key part of AMS is the permanent magnet system, which was built by the lnstitute of Electric Engineering, the institute of High Energy Physics and the Chinese Academy of Launch Vehicle Technology. This system includes a permanent magnet made of high grade NdFeB and a support structure. The unique design of the permanent magnet based on the magic ring fulfills the severe requirements on the magnetic field leakage and the dipole moment for space experiments. The permanent magnet weighs about 2 tons, and provides a geometric acceptance of 0.6 m2 · sr and an analyzing powerBL2 of 0.135 T · m2. It works up to 40°C without demagnetization. The main structure is a thin double shell, which undergoes the strong magnetic force and torque of the permanent magnet, as well as the large load during launching and landing. The permanent magnet system fulfills the requirements from AMS, and satisfies the strict safety standards of NASA.