Research on MgB₂ Superconducting Magnet With Iron Core for MRI

Magnesium diboride( MgB₂)shows a wide application prospect in the field of low field DC application for its relatively simple structure and rather higher critical temperature than LTS. With the development ofMgB₂composite superconductor manufacturing technology and cryogenic technology, developing conduction cooled superconducting MRI system withMgB₂composite superconductor is becoming increasingly feasible. AnMgB₂superconducting magnet for MRI was developed. TheMgB₂superconducting magnet is used to investigate the fundamental scientific problem of the MRI main magnet, including field uniformity and stability, influencing factors ofMgB₂composite superconductor on field uniformity and stability. The superconducting magnet consists of 2 solenoids wound withMgB₂wire with the length of 60 m. The magnet has an outer diameter of 169 mm, an iron core diameter of 135 mm, and air gap of 32 mm. The superconducting magnet is fabricated and tested. The central magnetic field reaches 1.0 T when the current of theMgB₂magnet is 290 A. The central magnetic field is 0.39 T when the current of theMgB₂magnet is 100 A. In this paper, main magnet for MRI withMgB₂composite superconductor is analysed and proposed, including magnet design, test results, and field uniformity.