Thin-Wall Bulk High Temperature Superconductor as a Permanent Cryomagnet

Xavier Chaud (1) , D. Kenfaui (1) , E. Louradour (2) , J. Noudem (3)

1 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble
2 CTI - Céramiques Techniques Industrielles
3 CRISMAT - Laboratoire de cristallographie et sciences des matériaux

Thin-wall single domains with artificial patterned holes are highly interesting for stimulating superconducting and mechanical properties of bulk YBCO materials. YBCO single domains were successfully grown from multiple holes preforms by using TSIG or TSMG techniques. The thin-wall configuration enables a remarkable improvement in flux trapping and superconducting properties whatever the used growth process. Progressive oxygenation under high pressure associated to the large specific areas was shown to boost the material performances. A trapped field maximum of 0.84 T was recorded at 0.2 mm above the top surface of a 16 mm thin wall pellet at 77 K. Such complex geometry can be easily and abundantly produced by using an extrusion process. We report for the first time to our knowledge the growth of a single domain from an extruded preform. Thin-wall samples were then impregnated by resign/alloy for mechanical reinforcement.

Mots clés: Extrusion; Flux trapping; High-pressure oxygenation; High temperature superconductors; Thin-wall single grain; Superconducting magnets; Yttrium barium copper oxide; Preforms; Resins; Barium compounds; Copper compounds; Cryogenics; High-temperature superconductors; Mechanical properties; Permanent magnets; Yttrium compounds

Domaines: Articles anciens

Xavier Chaud, D. Kenfaui, E. Louradour, J. Noudem. Thin-Wall Bulk High Temperature Superconductor as a Permanent Cryomagnet. IEEE Transactions on Applied Superconductivity, 2012, 22 (3), pp.6800304 - 6800304. ⟨10.1109/TASC.2011.2177489⟩. ⟨hal-01921451⟩