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[ALICE 3] fix petal Z cap positions, remove overlaps #15119

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[ALICE 3] fix petal Z cap positions, remove overlaps #15119

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14 changes: 9 additions & 5 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 @@ -84,6 +84,9 @@ inline bool isSolidToCut(const TGeoVolume* v)
if (TString(nm).BeginsWith("VD_InclinedWall")) {
return true;
}
if (TString(nm).Contains("_ZCap")) {
return true;
}
return false;
}

Expand Down Expand Up @@ -252,10 +255,11 @@ static const double diskZ_cm[6] = {-34.0f, -30.0f, -26.0f, 26.0f, 30.0f, 34.0f};

// Petal walls specifications (cm)
static constexpr double kPetalZ_cm = 70.0f; // full wall height
static constexpr double kWallThick_cm = 0.015f; // 0.15 mm
static constexpr double kWallThick_cm = 0.02f; // 0.2 mm
static constexpr double kInnerWallRadius_cm = 0.48f; // 4.8 mm (ALWAYS cylindrical)
static constexpr double kOuterWallRadius_cm = 4.8f; // 48 mm (can be changed)
static constexpr double kEps_cm = 2.5e-4f;
static constexpr double kEps_100um = 0.01f; // 100 microns in cm

// 3 inclined walls ("walls") specs for the full-cylinder option
// Thickness in-plane (cm). This is the short half-dimension of the TGeoBBox in XY.
Expand Down Expand Up @@ -604,8 +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 = 76.0; // cm
constexpr double vacuumVesselThickness = 0.08; // cm (0.8 mm)
constexpr double vacuumVesselLength = kPetalZ_cm; // cm
constexpr double vacuumVesselThickness = kWallThick_cm; // cm (0.2 mm)
const double halfVess = 0.5 * vacuumVesselLength; // 38.0 cm
const double gapStart = halfVess; // 38.00
const double gapEnd = halfVess + vacuumVesselThickness; // 38.08
Expand Down Expand Up @@ -783,8 +787,8 @@ static TGeoVolume* buildFullCylAssembly(int petalID, bool withDisks)

// --- Z end-cap walls to close the petal in Z ---
{
const double zMin = -0.5 * kLenZ_cm;
const double zMax = +0.5 * kLenZ_cm;
const double zMin = -0.5 * kPetalZ_cm - 2 * kWallThick_cm;
const double zMax = +0.5 * kPetalZ_cm + 2 * kWallThick_cm;
const double rIn = kInnerWallRadius_cm;
const double rOut = kOuterWallRadius_cm + kWallThick_cm;

Expand Down