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cfsem

Quasi-steady electromagnetics including filamentized approximations, Biot-Savart, and Grad-Shafranov.

Helmholtz coil example

Above is the B-field of a Helmholtz coil, calculated with cfsem. On the left, the red dashes outline where the B-field magnitude is within 1% of its value at (r=0, z=0), and the black dots show where the coils intersect the r-z plane. Full example here.