Study on dipole moment in permanent magnet used in space anti-matter detector

Qiuliang Wang, Tao Song, Chin E. Lin, Housheng Wang, Zheng Wang, Li Kong, Luguan Yan, Samuel C.C. Ting

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The dipole moment in the space anti-matter detector AMS01 magnet has been studied. A compensating method for the dipole moment in AMS01 was developed. The theoretical analysis and experimental test of 1/3 model magnet showed that the N47 NdFeB permanent magnetic material can compensate the dipole moment in 1000 Am3 with weight about 7 kg. A new testing method for the dipole moment of large scale AMS01 magnet is proposed. On the basis of the method, the measurement of the dipole moment in the AMS01 is about 11550 Am2 ±10%. The finite element calculation by ANSOFT is about 7300 Am 2. The difference between theory and experiment may come from the experiment environment, friction torque or the demagnetization of the magnet. It proves that the permanent magnetic block with high magnetic energy product to compensate the dipole moment is an effective method. The permanent magnetic block with magnetic energy product about 230.4 kj/m3 can compensate about 740 Am2 ±20% of dipole moment. The compensating permanent block magnet has a little effort on the central magnetic field and uniformity in the AMS01.

Original languageEnglish
Article number4520002
Pages (from-to)972-975
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - 2008 Jun

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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