Detailed plasma 4

[chris-ashe]

This pull request adds several new plasma physics variables to the physics_variables.py data structure, primarily focused on collision times, collision frequencies, mean free paths, and resistivity profiles for various plasma species. These additions enhance the granularity and detail of plasma modeling, especially for electron interactions with deuterons, tritons, and alpha particles.

New plasma variable additions:

• Added profiles for Spitzer classical resistivity, electron-alpha Spitzer slowing down time, and various collision times, collision frequencies, and mean free paths between electrons and other plasma species (deuterons, tritons, alpha particles) to the data structure (process/data_structure/physics_variables.py).
  Initialization updates:

• Updated the init_physics_variables function to include initialization and zeroing of the new plasma variable profiles and to ensure these new variables are properly set up as empty lists or default values (process/data_structure/physics_variables.py).

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 51.56250% with 186 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.69%. Comparing base (7b5ea2b) to head (7b3c464).

Files with missing lines	Patch %	Lines
process/core/io/plot/summary.py	7.81%	118 Missing ⚠️
process/models/physics/physics.py	46.03%	68 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4148      +/-   ##
==========================================
+ Coverage   49.63%   49.69%   +0.06%     
==========================================
  Files         148      148              
  Lines       29746    30098     +352     
==========================================
+ Hits        14764    14957     +193     
- Misses      14982    15141     +159     

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[Copilot]

Pull request overview

Adds additional detailed physics outputs for collisions (times/frequencies/mean free paths), Spitzer slowing-down time, and Spitzer resistivity, and exposes them through unit tests, MFILE output, and summary plotting.

Changes:

• Compute and output new collision-related profiles plus Spitzer slowing-down time and Spitzer resistivity in DetailedPhysics.run() / output_detailed_physics().
• Extend the physics variable data structure and initialization to include the new profiles.
• Add plotting helpers and extra summary pages to visualize the new profiles; extend the detailed-physics unit test to assert the new outputs are finite and correctly shaped.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
tests/unit/test_physics.py	Adds assertions for the new detailed-physics profiles.
process/models/physics/physics.py	Computes new collision/resistivity/slowing-down profiles; outputs them to MFILE.
process/data_structure/physics_variables.py	Adds new profile variables and initializes them.
process/core/io/plot/summary.py	Adds plots for new profiles and adjusts summary pagination/layout.
documentation/source/physics-models/detailed_physics.md	Documents new formulas for the added detailed-physics quantities.

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[Copilot]

Section header comment has a typo ("Resistivites"). Please correct to "Resistivities" for consistency and readability.

Suggested change

	# Resistivites
	# Resistivities

[Copilot]

Spitzer resistivity is being stored in res_plasma_fuel_spitzer_profile, but the data structure also introduces rho_plasma_spitzer_classical_profile (which remains unused). Please align naming/usage (e.g., populate the newly-added *_spitzer_classical_profile, or remove/rename it) so there is a single canonical variable for the Spitzer resistivity profile.

Suggested change

	physics_variables.res_plasma_fuel_spitzer_profile = self.calculate_spitzer_resistivity(
	n_charge=1,
	electron_ion_coulomb_log=physics_variables.plasma_coulomb_log_electron_deuteron_profile,
	temp_plasma_electron_kev=self.plasma_profile.teprofile.profile_y,
	)
	physics_variables.rho_plasma_spitzer_classical_profile = self.calculate_spitzer_resistivity(
	n_charge=1,
	electron_ion_coulomb_log=physics_variables.plasma_coulomb_log_electron_deuteron_profile,
	temp_plasma_electron_kev=self.plasma_profile.teprofile.profile_y,
	)
	physics_variables.res_plasma_fuel_spitzer_profile = (
	physics_variables.rho_plasma_spitzer_classical_profile
	)

[je-cook]

Just the one from me

[je-cook]

Mostly minors on top of my docstring one from before. I havent looked into the maths. I assume your tests cover the results of the calculations, if not we need a test for that

[je-cook]

Approving from the code side. Modelling should be reviewed too

[j-a-foster]

Happy with changes.