Cooling and Cooling-Down \MgB2 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. [ABSTRACT FROM PUBLISHER]