Development Of Prototype Mgb < Sub >< Bold >< Roman > 2 Superconducting Solenoid Magnet For High-Efficiency Klystron Applications

A wind-and-react MgB₂ solenoid magnet for klystrons has been developed. While the current normal-conducting (Cu) magnet consumes 20 & x00A0;kW per magnet, this MgB₂ magnet consumes less than 3 & x00A0;kW in refrigerator power. The conduction-cooled half coil of the magnet is 337 & x00A0;mm in inner diameter; the winding pack, 19.4 & x00A0;mm wide & x00D7; 136.6 & x00A0;mm high, uses 2.7 & x00A0;km of 10 filament circular conductor, which is insulated with glass 0.83 & x00A0;mm in diameter, and is reacted after being wound onto a stainless steel bobbin. The coil has Cu plates of 0.2 & x00A0;mm in thickness between each coil layer and on the inner and outer sides. The magnet has two coils and produces 0.8 & x00A0;T in the center and its stored energy is 11.8 & x00A0;kJ. Together with the above-mentioned coil structure, these coils can consume stored energy in itself at quench without a special quench protection system. A performance test of the magnet was successful.