Updates for FOCUS

[zhucaoxiang]

Dear all,

Sorry for the delay.

There are big changes updated for FOCUS. There are two parallel versions. Here I will only mention the changes in the new version (Old is mainly used by myself and Dr. Stuart Hudson). Here are the outlines. Please view more details in GitHub pages.

• current availability

  • coil representation
    Fourier series.
  • optimizers
    Differential Flow and Nonlinear Conjugate Gradient method.
  • cost functions
    Bn surface integral; Bn Fourier spectrum (in VMEC polar coordinate); toroidal magnetic flux; coil length.
  • post-processers
    OMFIT FOCUS Interface (if you are interested, please contact Dr. Nikolas Logan). There are also some scripts in the python package coil.py.

• examples
  Two illustrating cases, designing modular coils for l=2 rotating ellipse and designing RMP coils for DIII-D are placed in examples.

• I/O related
  The input files needed for a run are listed here, while you can also find detailed explanations of each variable in initial.pdf.

• plotting
  There are 14 plotting functions in coilpy. For time reasons, I haven't written detailed instructions. But you are free to explore the functions.

Please feel free to contact me. Thanks!

Best regards,
Caoxiang

[logan-nc]

Thanks @StellaratorCoils! I like the new docs at https://princetonuniversity.github.io/FOCUS/. I'll pull master, test the RMP examples and let you know how it goes.

As a side note, you can list OMFIT as a post-processor and plotter ;)

[zhucaoxiang]

@logan-nc My bad! I have updated.