Quench Propagation Study for Magnesium Diboride (MgB2) MRI Magnets

Magnesium diboride (MgB2), a high temperature superconductor, has been considered for use in conduction cooled MRI magnets to reduce the usage of liquid helium. Compared to NbTi wires the thermal normal zone propagation (NZP) in MgB2 is much slower leading to active quench protection designs. The NZP and the temperature rise in the coil were modeled using the Douglas-Gunn method to solve the 3D heat equation for wire with copper percentages varying from 15% to 50%. It was determined that wire with higher percentage of copper is more advantageous for quench protection due to the slower rise in maximum temperature.

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