酸化物超電導体の導体設計に関する検討

I. 磁気安定性の基準

抄録

In order to identify the critical issues in designing high field conductors of oxide superconductors, the magnetic stability of Y₁Ba₂Cu₃O_7-x has been analyzed assuming two sets of the operation temperature and the critical current density, 77K, 1×10⁹A/m² and 20K, 1×10¹⁰A/m². The dynamic stability criterion gives more stringent condition on the allowable maximum size of the superconductor compared with the adiabatic stability criterion. The thickness of tape or the wire radius should be less than 0.3mm at 77K and 0.1mm at 20K. The dynamic stability further requires that superconducting tape or wire is embedded in a normal metal with low electrical resistivity and high thermal conductivity.