3049 review and clarify timings

[j-a-foster]

Description

Renames timing variables to clarify their meanings. The docs have been updated to reflect this as well as redrawing of the plot that details the current vs time over a pulse.

These are the variables that have been renamed:

• tburn - t_burn
• tbrnmn - t_burn_min
• tohs - t_current_ramp_up
• tdwell - t_between_pulse
• tpulse - t_pulse_repetition
• tqnch - t_ramp_down
• tramp - t_precharge
• ftburn - ft_burn
• ftohs - ft_current_ramp_up
• tcycle - t_cycle

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

Attention: Patch coverage is 43.13725% with 29 lines in your changes missing coverage. Please review.

Project coverage is 28.58%. Comparing base (73d1488) to head (66259a4).
Report is 205 commits behind head on main.

Files with missing lines	Patch %	Lines
process/physics.py	0.00%	12 Missing ⚠️
process/pfcoil.py	0.00%	5 Missing ⚠️
process/vacuum.py	37.50%	5 Missing ⚠️
process/power.py	63.63%	4 Missing ⚠️
process/evaluators.py	0.00%	1 Missing ⚠️
process/io/plot_proc.py	0.00%	1 Missing ⚠️
process/io/plot_scans.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3413      +/-   ##
==========================================
+ Coverage   28.27%   28.58%   +0.30%     
==========================================
  Files          77       77              
  Lines       18428    18865     +437     
==========================================
+ Hits         5210     5392     +182     
- Misses      13218    13473     +255     

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[chris-ashe]

Just to make it easier incase someone comes looking can you put the variable names before and after in the PR description box

[j-a-foster]

I've updated the description to say which variables have been renamed.