adding trigger to mgxs convert#3925
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…ation # Conflicts: # openmc/model/model.py
convert_to_multigroup now defaults nparticles=None ("auto"). In auto mode the
continuous-energy generation run is no longer given a fixed, guessed particle
count; a relative-error trigger (ignore_zeros=True) is attached to the
cross-section tallies via Library.tally_trigger, so the run extends batches
until the group constants are statistically converged, bounded by an internal
max_batches cap. Passing an explicit integer keeps the previous fixed behaviour.
The convergence target, seed particles-per-batch and max-batches cap are
internal constants rather than new user-facing arguments, so the public API
gains no knobs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Description
At Physor 2026 an chatting with @jtramm and @pshriwise about making generation of multigroup use a trigger to allow it to end earlier if the reaction rates all meet the trigger relative error value. At the time it sounded like a good idea but in practice it appears to have enlarged the api interface to users which I was trying to avoid. I wanted to make this a draft PR just to show @jtramm and @pshriwise that I tried.
Fixes # (issue)
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