`Superconductors must be cooled to cryogenic temperatures during operation. The windings are typically cooled to temperatures significantly below their critical temperature, because the lower the temperature, the better superconductive windings work—the higher the currents and magnetic fields they can stand without returning to their non-superconductive state. Two types of cooling systems are commonly used to maintain magnet windings at temperatures sufficient to maintain superconductivity: Liquid-cooled and mechanical cooling. Liquid helium is used as a coolant for many superconductive windings. It has a boiling point of 4.2 K, far below the critical temperature of most winding materials` https://canhrau.com/wp-content/uploads/2022/04/nhung-hinh-anh-phong-canh-dep-nhat-hinh-2-2048x1280.jpg

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