Smart tracking volume#69
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Will now put some plots how this affect stuff |
Capybara summary for PR 69
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wdconinc
reviewed
May 29, 2026
wdconinc
reviewed
May 29, 2026
| /// are dropped (p.reason = 0), subject to the must-keep guards in end(). | ||
| /// Defaults match the legacy tracker_region_zmax / tracker_region_zmin | ||
| /// constants from epic/compact/tracking_region.xml. | ||
| double m_forwardZ{335 * dd4hep::cm}; ///< +Z dead-zone boundary (positive) |
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Explicit geometry values should be gotten from geometry, not hardcoded here.
wdconinc
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May 29, 2026
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Briefly, what does this PR introduce? Please link to any relevant presentations or discussions.
Adds a new DD4hep/Geant4 plugin
Geant4TVEicParticleHandlerinnpsim/src/plugins/. It runs the standard tracking-volume filter (verbatimfrom upstream
Geant4TVUserParticleHandler) and then layers an EIC-specificregional cut: drop particles ending at
endZ > ForwardRegionZorendZ < BackwardRegionZwhose |p| is below the configured threshold,unless they are primary,
KEEP_ALWAYS, or made a tracker hit. Calorimeterhits are optionally protected via the
KeepCaloHitParticlesproperty(default off — matches upstream policy and reduces shower bloat).
Configurable plugin properties (all in DD4hep units):
ForwardRegionZ(default+335 cm),BackwardRegionZ(-175 cm),ForwardMomentumMin(100 MeV),BackwardMomentumMin(100 MeV),KeepCaloHitParticles(false).User-facing doc:
npsim/src/plugins/doc/Geant4TVEicParticleHandler.md.Closes #__.
What is the urgency of this PR?
What kind of change does this PR introduce?
Please check if any of the following apply
SIM.part.userParticleHandler = "Geant4TVEicParticleHandler".)There are several considerations made: