Long-Length Critical Current Measurement of MgB2 Wire in a Coil

MgB
₂
opens the door to viable, cryogen-free, and thermally stable MRI magnets. A multiturn multilayer MgB
₂
solenoid coil was tested in a variable temperature environment from 5 to 34 K in order to validate the conductor's long-length critical current and
$n$
-value performance. The reacted wire was successfully wound and impregnated without imparting noticeable strain damage to the MgB
₂
filaments as demonstrated by the consistency between measured long-length wire performance of the coil and the short sample data. Expected coil performance was calculated by taking into account ferromagnetic wire matrix and critical current scaling based on current percolation model.