Step tf turn structure

[chris-ashe]

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 37.10247% with 178 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.02%. Comparing base (8dd9e07) to head (28a8229).

Files with missing lines	Patch %	Lines
process/superconducting_tf_coil.py	50.34%	73 Missing ⚠️
process/io/plot_proc.py	3.38%	57 Missing ⚠️
process/tf_coil.py	0.00%	47 Missing ⚠️
process/init.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3955      +/-   ##
==========================================
- Coverage   46.05%   46.02%   -0.04%     
==========================================
  Files         123      123              
  Lines       28738    28981     +243     
==========================================
+ Hits        13235    13338     +103     
- Misses      15503    15643     +140     

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