US 11,948,736 B2
Superconducting magnet systems and methods for making superconducting magnet systems having two-stage quenching
Zhenyu Zhang, Florence, SC (US); and Stuart Paul Feltham, Florence, SC (US)
Assigned to GE Precision Healthcare LLC, Wauwatosa, WI (US)
Filed by GE Precision Healthcare LLC, Wauwatosa, WI (US)
Filed on Apr. 6, 2022, as Appl. No. 17/714,669.
Prior Publication US 2023/0326641 A1, Oct. 12, 2023
Int. Cl. H01F 6/06 (2006.01); H01F 6/02 (2006.01); H01F 27/28 (2006.01)
CPC H01F 6/06 (2013.01) [H01F 6/02 (2013.01); H01F 27/2885 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A superconducting magnet system having two-stage quenching, the superconducting magnet system comprising:
a primary coil assembly having a coil section configured to be superconducting when conducting current below a first critical current; and
an EMI shielding coil assembly having one or more coil sections electrically coupled to a variable resistor, the one or more coil sections being configured to be superconducting when conducting current below a second critical current, and the variable resistor being configured to be superconducting when conducting current below a third critical current and to be non-superconducting when conducting current at or above the third critical current, wherein the third critical current is less than both the first critical current and the second critical current;
wherein the EMI shielding coil assembly is configured such that generating a magnetic flux within the EMI shielding coil assembly causes the current conducted through the variable resistor to exceed the third critical current, quenching the variable resistor and generating heat; and
wherein the EMI shielding coil assembly is disposed such that the heat from the variable resistor quenches the primary coil assembly.