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A persistent-mode 0.5 T solid-nitrogen-cooled MgB2 magnet for MRI.

Jiayin Ling1,2, John P Voccio1,3, Seungyong Hahn1,4

  • 1Francis Bitter Magnet Lab, Plasma Science and Fusion Center, Massachusetts Institute Technology, 170 Albany St, Cambridge, MA 02139, USA.

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Summary

Researchers developed a 0.5-T persistent-mode magnesium diboride (MgB2) magnet. This superconducting magnet operated reliably at 10-13 K using solid nitrogen cryogenics.

Keywords:
MRI magnetMgB2persistent modesolid nitrogen

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Area of Science:

  • Superconducting magnet technology
  • Cryogenic engineering
  • Materials science

Background:

  • Development of high-field superconducting magnets is crucial for various scientific applications.
  • Magnesium diboride (MgB2) offers a promising alternative for superconducting magnets due to its relatively high critical temperature.

Purpose of the Study:

  • To present the construction and test results of a persistent-mode 0.5-T MgB2 magnet.
  • To evaluate the performance of MgB2 coils and persistent-current switches in a solid nitrogen environment.

Main Methods:

  • Construction of an 8-solenoidal coil magnet using monofilament MgB2 wire with integrated persistent-current switches.
  • Operation of the magnet in a solid nitrogen cryostat cooled by a two-stage cryocooler.
  • Measurement of the central magnetic field and analysis of coil performance via field profile.

Main Results:

  • The MgB2 magnet achieved a persistent central magnetic field of 0.47 T at 10-13 K.
  • Persistent-current switches operated successfully in solid nitrogen for magnet ramping and quench protection.
  • Solid nitrogen provided a stable cryogenic environment for sustained magnet operation.

Conclusions:

  • The developed MgB2 magnet demonstrates successful persistent-mode operation at 10-13 K.
  • Solid nitrogen is a viable cryogen for operating superconducting magnets.
  • The integrated persistent-current switches are effective for ramping and quench protection.