Tutorial IV: Miscellaneous output utilities

QUADCOIL includes a few small output utilities for passing surfaces and coil solutions to other stellarator tools. This section covers utilities that do not fit into the DESC or Simsopt-specific tutorials.

FOCUS/FAMUS plasma boundary files

quadcoil.io.focus.save_focus writes a Fourier RZ surface to a .plasma file for FOCUS or FAMUS runs with CASE_SURFACE=0:

from quadcoil.io.focus import save_focus

save_focus(qp.plasma_surface, "plasma_boundary.plasma")

The input surface may be any of the following:

• a QUADCOIL SurfaceRZFourierJAX;

• a Simsopt SurfaceRZFourier;

• a DESC FourierRZToroidalSurface.

If the filename does not end in .plasma, the extension is added automatically. The exported file contains the Fourier coefficients of the surface; it does not include a normal-field target.