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A superconducting magnet system for whole-body metabolism imaging

  • Q. Wang
  • , Y. Dai
  • , B. Zhao
  • , S. Song
  • , C. Wang
  • , L. Li
  • , J. Cheng
  • , S. Chen
  • , H. Wang
  • , Z. Ni
  • , Y. Li
  • , C. Cui
  • , X. Hu
  • , H. Wang
  • , Y. Lei
  • , K. Chan
  • , L. Yan
  • , C. Wen
  • , G. Hui
  • , W. Yang
  • F. Liu, Y. Zhuo, X. Zhou, Z. Yan, J. Chen, T. Xu
  • CAS - Institute of Electrical Engineering
  • University of Queensland
  • CAS - Institute of Biophysics

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

A 9.4 Tesla superconducting magnet is designed and fabricated with a warm bore of 800 mm for neuroscience research. The superconducting magnet will be made of a NbTi Wire-in-Channel (WIC) conductor with a higher ratio of copper to non-copper, which thus sustains the high stresses. It is cooled to operate temperature at 4.2 K liquid helium. The cryostat system is cooled through GM cryocoolers, some used to cool the radiation shield, and the others realize the re-condensed liquid helium. The MRI magnet system has a high level of stored energy, about 134 MJ, and a relatively-lower nominal current, about 212.5 A. The magnet will be operated in a persistent current mode with a superconducting switch. The WIC wires are employed to meet the cryostability criteria to avoid any risks from quench. The protection circuit with the subdivision of the coil reduces the terminate voltage and hot-spot temperature. In the paper, the specifications of magnet system will be presented.

Original languageEnglish
Article number6080713
JournalIEEE Transactions on Applied Superconductivity
Volume22
Issue number3
DOIs
StatePublished - 2012

Keywords

  • Metabolism imaging
  • MRI superconducting magnet
  • passive shield
  • sub-division quench protection

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