Practical Design and Experimental Test of MgB2 Magnets for 300 kW-Class Superconducting Induction Heater

摘要

A shape and characteristics of Superconducting magnets used in superconducting applications are effected by purposing of a device and these coils are wound with various superconducting wires such as high temperature superconducting (HTS) wire and low temperature superconducting (LTS) wire. MgB2 wire is the one of the wires which can compensate the disadvantages of each wire. Therefore, if we adopt MgB2 wire to superconducting applications, we get advantages such as operating temperature with cryogen free cooling system and wire's price. In this paper, the author designs, fabricates and tests MgB2 magnet for a 300 kW-class DC superconducting induction heater. Firstly, MgB2 magnet is designed and analyzed using finite elements method for a 300 kW-class superconducting induction heater. Secondly, the magnet is fabricated using dry-winding and metal insulation method. Finally, MgB2 magnet is stacked and assembled into conduction cooling property measurement system for evaluate its performance and characteristics. As a result, MgB2 magnet guaranties a satisfactory performance with low price and highest critical temperature among LTS wires. The low temperature as 10 K, which is the operating temperature of the MgB2 magnet, can be achieved by a conduction cooling system. This study will be effectively utilized for a 300 kW-class superconducting induction heater and other superconducting magnet applications.