Magnetic field of modulated double helical coils

Analytical and numerical calculation of the magnetic field generated by a modulated double helical coil (double helix coil, canted-cosine-theta coil). The analytical solution is obtained from [1, Eq.(13)]. The numerical solution is obtained by numerical integration of the Biot-Savart’s law in the filament approximation (require BSmag toolbox).

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[Queval2015] L. Quéval, R. Gottkehaskamp, “Analytical field calculation of modulated double helical coils,” IEEE Transactions on Applied Superconductivity, vol. 25, no. 6, pp. 4901307, Dec. 2015.