Abstract #3627

The Study of Quench Propagation for a MgB2 1.5 T MRI Magnet Design at Different Operating Temperatures

Charles R. Poole¹, Tanvir Baig¹, Robert J. Deissler¹, David Doll², Michael Tomsic², and Michael A. Martens¹

¹Department of Physics, Case Western Reserve University, Cleveland, OH, United States, ²Hyper Tech Research Inc., Columbus, OH, United States

To reduce the usage of liquid helium, conduction cooled MRI magnets using high temperature magnesium diboride (MgB2) have been considered. Because the thermal normal zone propagation velocity (NZPV) of MgB₂ is much slower compared to NbTi wire, active quench protection is needed. The temperature rise in the magnet design was modeled using Douglas-Gunn method to solve the governing heat equation for operating temperatures ranging from 10 to 18 K. It was shown that the temperature rise is slower for higher operating temperatures, and thus better for quench protection.

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