Output files

Once calling the subroutuine saving, present calculating results will be saved to local files. The frequency of writing outputs is controlled by the variable save_freq. The basic output file is written in hdf5 format.

• hdf5 file

  All the results can be seen in focus_example.h5. Any hdf5 file reading functions can be used for reading the results.

If you want to view other output files, please turn on the flags in the namelist.

• save_coils

  Optimized coils will be stored in example.focus and example.coils. They are FOCUS format coils and the standard coils file mentioned above, respectively. So they can be used as the initial coils of next optimization.

• save_harmonics

  The Bn spectrum produced by current coils are stored in example.harmonics.

• save_filaments

Intermediate coil data (XYZ points in space) are stored in binary file .example.filaments.000001. So you can use them to plot coil evolution movie. (Better way is to use the data in hdf5 file.)

Various post-processing options are available and they are controlled by case_postproc. Here is a list of available functions.

post_proc	actions
0	None
1	Basic post-processing
2	Basic post-processing + SPEC input preparation
3	Basic post-processing + Poincare plots
4	Basic post-processing + Poincare plots + Boozer spectrum calculation
5	Basic post-processing + Write MGRID file

 

Plotting

There are several tools for processing the data. If you need to use one of them, please contact the author(s).

• Python: There is an python package written by Dr. Caoxiang Zhu, using Matplotlib and Mayavi.
• OMFIT: In the OMFIT frame, there is a powerful module focus managed by Dr. Nikolas Logan.
• IDL: There is a GUI interface Echidna in IDL written by Dr. Stuart Hudson.
• Matlab: There are also some MATLAB scripts by Dr. Samuel Lazerson.