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A superconducting switch, which allows a magnetic resonance imaging (MRI) magnet to be ramped up to its designed magnetic field and parked in a persistent state, is designed, analyzed, and under construction in Wuhan National High Magnetic Field Center. It is a thermally controlled liquid-helium-cooled superconducting switch, consisting of bobbins, flanges, bifilar-wound superconducting coils, and a heater. The multifilament NbTi wire and cable with CuNi matrix are adopted due to their high resistance characteristic, which can reduce helium boil-off volume during operation. Two distinct finite-element analyses, ANSYS Parametric Design Language and COMSOL, are adopted to analyze and compare the key parameters of the superconducting switch, which include its temperature profile and resistance over time. The key parameters' results of these two models match well. The switch has a nominal resistance of 18.88 Ω. The transition time from the superconducting state to the normal state is less than 4.5 s with heater's current of 0.4 A.
Chen et al. (Tue,) studied this question.
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