Properties of doped ex and in situ MgB2 multifilament superconductors

7 pages, 11 figures, 1 table.Four-filament ex and in situ MgB2 wires were prepared with the rectangular wire-in-tube (RWIT) technique. Based on experience with single-core wires, 10 wt% of W was added to the ex situ and 10 wt% of SiC to the in situ powders, which were packed into Fe and Nb/AgMg tubes, respectively, and two-axially rolled into composite conductors. The ex and in situ conductors are compared in terms of field-dependent transport critical current density, effects of filament size reduction and twisting, mechanical behaviour and thermal stability.This work was supported by the Science and Technology Assistance Agency under the contract number APVT-51-029902, and by the EU FP6 contract number NMP3-CT2004-505724. Authors would like to thank T Holúbek for the I–V characteristic measurements.Peer reviewe

Properties of doped ex and in situ MgB2 multifilament superconductors

7 pages, 11 figures, 1 table.Four-filament ex and in situ MgB2 wires were prepared with the rectangular wire-in-tube (RWIT) technique. Based on experience with single-core wires, 10 wt% of W was added to the ex situ and 10 wt% of SiC to the in situ powders, which were packed into Fe and Nb/AgMg tubes, respectively, and two-axially rolled into composite conductors. The ex and in situ conductors are compared in terms of field-dependent transport critical current density, effects of filament size reduction and twisting, mechanical behaviour and thermal stability.This work was supported by the Science and Technology Assistance Agency under the contract number APVT-51-029902, and by the EU FP6 contract number NMP3-CT2004-505724. Authors would like to thank T Holúbek for the I–V characteristic measurements.Peer reviewe