Feasibility of Hydrogen Cooled Superconducting Magnets

It looks feasible to realize hydrogen cooled superconducting magnets with High Tc Superconductors (HTS) and newly discovered magnesium di-boride (MgB2). As is well known, liquid and slush hydrogen between 15~20 K, could be not only an excellent refrigerant for HTS and MgB2, but also a clean energy transporter without exhaust of carbon di-oxide. HTS cooled by liquid hydrogen at 22 K can carry as large as several times current at 77 K cooled by liquid nitrogen. These are reasons why liquid hydrogen is preferable for SMES refrigerant to liquid nitrogen. One of such possibilities, an emergent power supply composed with SMES, Liquid Hydrogen Storage, Fuel Cell and Lithium Battery is designed and proposed. As a practical example, the conceptual design of 200 MW, 10 hour emergency power supply is described