Large field generation with Hot Isostatically Pressed Powder-in-Tube MgB2 coil at 25 K

Details Large field generation with Hot Isostatically Pressed Powder-in-Tube MgB2 coil at 25 K Large field generation with Hot Isostatically Pressed Powder-in-Tube MgB2 coil at 25 K

2004-04-02

arxiv.org/abs/cond-mat/0404052v3

Physics

Condensed Matter

Superconductivity

8 pages 3 figures

Scientific paper

10.1088/0953-2048/17/10/L01

We present the fabrication and test results of Hot-Isostatic-Pressed (HIPed) Powder-in-Tube (PIT) MgB$_2$ coils. The coils properties were measured by transport and magnetization at different applied fields ($H$) and temperatures ($T$). The engineering critical current ($J_e$) value is the largest reported in PIT MgB$_2$ wires or tapes. At 25 K our champion 6-layer coil was able to generate a field of 1 T at self-field ($I_c >$ 220 A, $J_e \sim 2.8 \times 10^4$ A/cm$^2$). At 4 K this coil generated 1.6 T under an applied field of 1.25 T ($I_c \sim350$ A, $J_e \sim 4.5 \times 10^4$ A/cm$^2$). These magnetic fields are high enough for a superconducting transformer or magnet applications such as MRI. A SiC doped MgB$_2$ single layer coil shows a promising improvement at high fields and exhibits $J_c > 10^4$ A/cm$^2$ at 7 T.

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