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Nowadays, long lengths of MgB 2 conductors on the kilometer scale fabricated by the powder-in-tube process are commercially available. Due to its relatively low cost, high critical current density ( $J_{c}$), low anisotropy, and a critical temperature of about 40 K, MgB 2 may be attractive for several applications. Examples of these are as MgB 2 coils for superconductor transformers, as induction...
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