Title :
Development of MgB2-Based Bulk Supermagnets
Author :
Koblischka, Michael R. ; Wiederhold, Alexander ; Muralidhar, Miryala ; Inoue, Ken ; Hauet, Thomas ; Douine, Bruno ; Berger, Kevin ; Murakami, M. ; Hartmann, Uwe
Author_Institution :
Inst. of Exp. Phys., Saarland Univ., Saarbrucken, Germany
Abstract :
A series of disk-shaped, bulk MgB2 superconductors (sample diameter 20 mm, reaction temperatures ranging between 750 °C and 950 °C) was prepared to improve the performance for superconducting supermagnets. These samples were characterized by magnetic and electric measurements in fields up to 7 T and at various temperatures 10 K <;T<; 35 K. The irreversibility lines, the current densities, the resistance, and the achievable trapped fields were determined. To analyze the data, a scaling of the flux pinning forces, Fp= jc× B, was performed. The different scaling behavior of the samples prepared at low- and high-reaction temperatures is discussed, considering the achieved microstructures.
Keywords :
current density; electric resistance; flux pinning; magnesium compounds; superconducting magnets; type II superconductors; MgB2; current density; disk-shaped bulk superconductors; electric measurements; electric resistance; flux pinning forces; irreversibility lines; magnetic measurements; microstructure; superconducting supermagnets; temperature 10 K to 35 K; temperature 750 degC to 950 degC; trapped fields; Critical current density (superconductivity); Force; Grain boundaries; High-temperature superconductors; Magnetic resonance imaging; Superconducting magnets; Temperature measurement; Flux pinning forces; MgB2; supermagnets; trapped fields;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2323995
