vmec_jax.external_fields

External magnetic-field providers for free-boundary VMEC calculations.

The mgrid backend preserves VMEC2000 compatibility. Direct coil providers are JAX-native and intended for differentiable, coil-aware optimization.

Modules

base	Provider dispatch for external free-boundary magnetic fields.
coils_jax	Pure-JAX Fourier coils and Biot-Savart external-field sampling.
essos_adapter	Optional adapter from ESSOS coils to vmec_jax direct-coil params.
mgrid_jax	Differentiable JAX interpolation for VMEC mgrid fields.