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[MI3] Add superconducting magnet/cryostat geometry to ALICE3 MID simulation - #15585

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[MI3] Add superconducting magnet/cryostat geometry to ALICE3 MID simulation#15585
joseesquivel-hub wants to merge 5 commits into
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@joseesquivel-hub

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Adds the superconducting magnet/cryostat geometry to the MI3 detector simulation in the ALICE3 upgrade path, based on GEANT4 standalone studies by Ian Perez ICN-UNAM).

Changes to Detectors/Upgrades/ALICE3/MID/simulation/src/Detector.cxx:

  • New materials added: Iron (pure Fe), WindingPack (NbTi+Cu+Al composite, Arnaud report v0.2, density 2.96 g/cm³), Vacuum
  • Seven-layer cryostat geometry implemented: inner wall, vacuum gap, winding pack, MLI, support cylinder, vacuum gap, outer wall
  • Magnet positioned in cave volume, verified with zero geometry overlaps

Verified with o2-sim --detectorList ALICE3: geometry increases from 7238 to 7246 volumes, 0 illegal overlaps detected.

@lmassacr

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Dear @joseesquivel-hub ,
Please don't modify the MUON/MID code, and commit your code under the ALICE3 repository only.
I am not approving this PR.

@njacazio
njacazio marked this pull request as draft July 8, 2026 08:58
@njacazio

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Hi, while we discuss the implementation details I move this to draft

@joseesquivel-hub
joseesquivel-hub marked this pull request as ready for review July 15, 2026 13:44
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@joseesquivel-hub@lmassacr@njacazio