Copper sheath MgB2 wires fabricated by an in situ PIT method

S. Shimura, T. Machi, Masato Murakami, N. Koshizuka, K. Mochizuki, I. Ishikawa, N. Shibata

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Abstract

We investigated the applicability of Cu as sheath materials for MgB 2 wires prepared by in situ PIT (powder-in-tube) method in comparison with stainless steal. Since the critical current density of MgB2 increases with TiH2 doping, we prepared TiH2 doped MgB2 Cu sheath wires 40 m in length and ∅ 1.0 mm or 0.5×1.0 mm2 in cross section by rotary swaging, drawing, and two-axial rolling under cold working. We then annealed the samples at 600-850 °C for 1-2 h in Ar gas atmosphere. The critical current of TiH2 (6%) doped MgB2/Cu short sample annealed at 650 °C reached 208 A (Jc=230 kA/cm2) at 4.2 K and self-field. We also fabricated several coils using these wires. The Ic value was ∼100 A at 4.2 K for a coil prepared with use of a 5 m length wire. These results suggest that it is possible to fabricate Cu sheathed MgB2 wires with good performance by using the in situ PIT method.

Original languageEnglish
Pages (from-to)1179-1183
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2004 Oct

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Keywords

  • Copper sheath
  • Critical current
  • In situ
  • MgB wire
  • Powder-in-tube

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Shimura, S., Machi, T., Murakami, M., Koshizuka, N., Mochizuki, K., Ishikawa, I., & Shibata, N. (2004). Copper sheath MgB2 wires fabricated by an in situ PIT method. Physica C: Superconductivity and its Applications, 412-414(SPEC. ISS.), 1179-1183. https://doi.org/10.1016/j.physc.2004.02.222