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ALICE 3 fix: overlap bw IRIS material and vacuum #15185

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njacazio merged 1 commit into from
Mar 18, 2026
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ALICE 3 fix: overlap bw IRIS material and vacuum #15185

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4 changes: 2 additions & 2 deletions Detectors/Upgrades/ALICE3/TRK/simulation/src/VDGeometryBuilder.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -608,8 +608,8 @@ static void addIRISServiceModulesSegmented(TGeoVolume* petalAsm, int nPetals)

// --- Vacuum vessel window around z∈[-L/2, +L/2] with wall thickness on +Z side
// Keep these in sync with TRKServices::createVacuumCompositeShape()
constexpr double vacuumVesselLength = kPetalZ_cm; // cm
constexpr double vacuumVesselThickness = kWallThick_cm; // cm (0.2 mm)
constexpr double vacuumVesselLength = 76.0; // cm
constexpr double vacuumVesselThickness = 0.08; // cm (0.8 mm)
const double halfVess = 0.5 * vacuumVesselLength; // 38.0 cm
const double gapStart = halfVess; // 38.00
const double gapEnd = halfVess + vacuumVesselThickness; // 38.08
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