8000 feat: tighten up the world to a more minimal geometry by wdconinc · Pull Request #896 · eic/epic · GitHub
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feat: tighten up the world to a more minimal geometry #896

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wdconinc
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Briefly, what does this PR introduce?

This PR shrinks the world volume from 60 m x 60 m x 200 m to something that is just sufficient to enclose the relevant volumes. This way we won't be tracking slow neutrons on their way to death in air.

What kind of change does this PR introduce?

  • Bug fix (issue: the world is too big)
  • New feature (issue #__)
  • Documentation update
  • Other: __

Please check if this PR fulfills the following:

  • Tests for the changes have been added
  • Documentation has been added / updated
  • Changes have been communicated to collaborators: @ajentsch @simonge this makes the forward and backwards regions quite narrow, chosen based on what's currently in the geometry

Does this PR introduce breaking changes? What changes might users need to make to their code?

No.

Does this PR change default behavior?

No.

@wdconinc
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Hmm, "Unknown Shape TGeoCompositeShape" in convert-to-step...

@wdconinc
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Removed volumes extruding out of mother volume by increasing some dimensions. Now looks like this in ZOY ortho view:
image

@github-actions github-actions bot added the topic: far-forward Deterctors for small-angle particles label Jun 24, 2025
@wdconinc
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There was a hidden vacuum volume that is now also fixed, so finally overlaps succeed:
image

@wdconinc wdconinc requested a review from ajentsch June 24, 2025 22:28
@wdconinc wdconinc requested a review from simonge June 24, 2025 22:46
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For reference, this is the world before, which is clearly more than necessary (and it's all air, not vacuum):
image

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