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).
 L. Quéval, R. Gottkehaskamp, "Analytical field calculation of modulated double helical coils," IEEE Trans. on Applied Superconductivity, in press.
pdf : https://www.academia.edu/15190913/Analytical_field_calculation_of_modulated_double_helical_coils
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