Patent ID: 11948736
Assignee: GE PRECISION HEALTHCARE LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 19:
20. 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;
an EMI shielding coil assembly having one or more coil sections configured to be superconducting when conducting current below a second critical current;
a variable resistor electrically coupled to the EMI shielding coil assembly and thermally coupled to the primary coil assembly, 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 that is less than both the first critical current and the second critical current;
an external device configured to generate a magnetic flux within the EMI shielding coil assembly when positioned in proximity thereto, wherein generating the 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 generated by the variable resistor quenches the primary coil assembly.