Permanent magnet system of alpha magnetic spectrometer |
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Authors: | CHEN Hesheng |
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Institution: | Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China |
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Abstract: | 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 powerBL
2 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. |
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Keywords: | particle physics experiment in space magnetic spectrometer permanent magnet magic ring mechanical structure in space |
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