Development of MgB2-based, bulk supermagnets

Michael Rudolf Koblischka (1) , Alex Wiederhold (1) , Muralidhar Miryala (2) , Kazuo Inoue (2) , Thomas Hauet (3) , Bruno Douine (4) , Kévin Berger (4) , Masato Murakami (2) , Uwe Hartmann (1)

1 Institute of Experimental Physics
2 Superconducting Materials Laboratory
3 IJL - Institut Jean Lamour
4 GREEN - Groupe de Recherche en Electrotechnique et Electronique de Nancy

A series of disk-shaped, bulk MgB2 superconductors (sample diameter up to 40 mm, reaction temperatures ranging between 750 °C and 950 °C) was prepared in order 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.

Mots clés: flux pinning forces; trapped fields; MgB2; supermagnets

Domaines: Supraconductivité [cond-mat.supr-con]; Science des matériaux [cond-mat.mtrl-sci]; Electromagnétisme; Energie électrique

Michael Rudolf Koblischka, Alex Wiederhold, Muralidhar Miryala, Kazuo Inoue, Thomas Hauet, et al.. Development of MgB2-based, bulk supermagnets. INTERMAG Europe 2014, May 2014, Dresden, Germany. pp.id. HE-3. ⟨hal-00991207v2⟩