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An advanced internal Mg infiltration method (AIMI) in this paper has beenshown to be effective in producing superconducting wires containing dense MgB2layers with high critical current densities. In this study, the in-fieldcritical current densities of a series of AIMI-fabricated MgB2 strands wereinvestigated in terms of C doping levels, heat treatment (HT) time and filamentnumbers. The highest layer Jc for our monofilamentary AIMI strands is 1.5 x10^5 A/cm2 at 10 T, 4.2 K, when the C concentration was 3 mol% and the strandwas heat-treated at 675 {\deg}C for 4 hours. Transport critical currents werealso measured at 4.2 K on short samples and one-meter segments ofeighteen-filament C-doped AIMI strands. The layer Jcs reached 4.3 x 10^5 A/cm2at 5 T and 7.1 x 10^4 A/cm2 at 10 T, twice as high as those of the best PITstrands. The analysis of these results indicates that the AIMI strands,possessing both high layer Jcs and engineering Jes after further optimization,have strong potential for commercial applications.

Effects of carbon concentration and filament number on advanced internal-Mg-infiltration-processed MgB2 Strands