🐛 Add full tf midplane thickness

[chris-ashe]

This pull request introduces two new parameters describing the toroidal field (TF) coil's geometry at the midplane—dr_tf_full_midplane and dr_tf_internal_midplane—and refactors the code to use a dataclass (TFGlobalGeometry) for returning TF coil geometry. It updates the calculation, storage, output, and plotting of these new parameters, and adapts related tests accordingly.

TF coil geometry calculation and data structure refactor:

• Introduced a TFGlobalGeometry dataclass in process/models/tfcoil/base.py to encapsulate all global TF coil geometry parameters, replacing the previous tuple return value from tf_global_geometry. The dataclass now includes the new dr_tf_full_midplane and dr_tf_internal_midplane fields.
• Updated run_base_tf to use the new dataclass and assign its fields to the appropriate variables.

New TF coil midplane width parameters:

• Added dr_tf_full_midplane and dr_tf_internal_midplane to process/data_structure/tfcoil_variables.py, with initialization and docstrings, and ensured they are initialized in init_tfcoil_variables.
• Calculated these parameters in tf_global_geometry as the full external and internal coil widths at the midplane.

Output and plotting updates:

• Updated the output routine (outtf) to write the new parameters to output files.
• Modified plotting in process/core/io/plot/summary.py to use the new parameters for midplane width annotations.

Test updates:

• Updated tests in tests/unit/models/tfcoil/test_tfcoil.py to check the new parameters, use the dataclass, and compare results using astuple.

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 70.83333% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.10%. Comparing base (4c99916) to head (9a056d7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/tfcoil/base.py	66.66%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4201      +/-   ##
==========================================
+ Coverage   52.07%   52.10%   +0.02%     
==========================================
  Files         148      148              
  Lines       30321    30365      +44     
==========================================
+ Hits        15791    15822      +31     
- Misses      14530    14543      +13     

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[Copilot]

Pull request overview

This PR adds explicit TF coil midplane radial thickness outputs (full/external and internal) to the TF coil model, surfaces them in output/MFILE, and updates plotting and unit tests to use the new values.

Changes:

• Refactor tf_global_geometry to return a TFGlobalGeometry dataclass and add dr_tf_full_midplane / dr_tf_internal_midplane calculations.
• Persist the new midplane thickness values into tfcoil_variables and output them via outtf.
• Update summary plotting and unit tests to consume the new midplane thickness values.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
process/models/tfcoil/base.py	Introduces TFGlobalGeometry dataclass, computes/stores new midplane thickness variables, and outputs them.
process/data_structure/tfcoil_variables.py	Adds new TF coil variable slots and initializes them.
process/core/io/plot/summary.py	Updates TF coil structure plot labels to use dr_tf_*_midplane from MFILE.
tests/unit/models/tfcoil/test_tfcoil.py	Updates unit tests for the new return type and verifies the new thickness values.

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