Cooling and Cooling-Down $\hbox {MgB}_{2}$ and HTS Magnets Using a Hydrogen Thermal Siphon Loop and Coolers Operating From 15 K to 28 K

MgB₂ and high-temperature superconducting (HTS) magnets might be better cooled using a cooler if they operate in the temperature range from 15 to 40 K. Liquid neon has been considered as a fluid for cooling such magnets. Neon can only be used in the upper part of the temperature range; neon is scarce and has poor thermal properties when compared to hydrogen or helium. For many MgB₂ and HTS magnet applications, liquid hydrogen is an ideal working fluid. Liquid hydrogen has a high heat of vaporization, a high specific heat, and excellent heat transfer properties. This paper describes the kind of thermal siphon cooling loop that can be used for cooling-down a superconducting magnet and keeping it cold in the range from 15 to 28 K. This report will present a method for using hydrogen gas to cool-down and cool a magnet that is relatively safe.