Enhancement of charging and discharging rates for partially insulated MgB2 magnets composed of Cr-coated MgB2 superconducting wires

Influence of filament number and size on the basic properties of in situ made MgB2 wires

“…Figure 9(d [20]. Comparable winding current density was measured for coils made by Kim et al [20] and by Kopera et al [18]. The present uninsulated W&R coil made from 0.64 × 0.80 mm SD18 square wire shows the same winding current densities (J w > 10 4 A cm −2 for B < 5.63 T) as the coil made by IMD process [19], and is attractive for future applications.…”

“…Despite of these differences, figure 9(c) demonstrates good uniformity of the ∼20 m long SD18 rolled short wire wound into a coil. Figure 9(d [20]. Comparable winding current density was measured for coils made by Kim et al [20] and by Kopera et al [18].…”

DC characterization of advanced fine-filamentary MgB2 superconducting wires

“…values of in-situ wires with different filament sizes at constant field 5.5 T confirming the best performance for W114 with averaged filament below 20 µm. J e = 10 4 A cm −2 at 5-6 T are usually measured for in-situ MgB 2 wires with smaller number of filaments 6-30, and corresponding filament size 60-150 µm [2][3][4][5][6] and therefore wires W144 and W192 are really highquality filamentary wires.…”

“…Today, filamentary MgB 2 superconductors are already produced in the km lengths composite wires by several commercial companies: Columbus [1], HyperTech [2], Hitachi [3], Sam Dong [4], Western Superconducting Technologies [5] and by Kiswire Advanced Technology [6]. Mentioned above, companies utilize the in-situ Powder-in-Tube (PIT) process for long length cold drawn MgB 2 wire production with filament's number ranging from 6 to 37 [2][3][4][5][6]. These superconductors are especially interesting for low or medium field applications at temperatures around 20 K [7][8][9][10][11].…”

Various effects of aliphatic amino acids on the critical current of the MgB2 superconductor

“…Other interesting properties of this compound from commercial and technological points of view include the low price of the constitutive elements, a reasonably high critical temperature (Tc) of about 39 K and relative ease of synthesis. MgB2 has already demonstrated its potential for various applications such as high field magnets [2][3][4], energy storage devices [5,6], high power cables [7],…”