Superconducting magnet: A magnet made of superconducting wires. Usually, the external current source as shown in figure 1 is used to work, and the lifting field is convenient and safe. In principle, closed superconducting circuits can also be used to work in superconducting switching mode. Superconducting wires can run without resistance at low temperature, so they have great advantages and are widely used in industry, scientific research and medical fields.