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[ALICE3] Magnet: update dimensions to specs #15586

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[ALICE3] Magnet: update dimensions to specs #15586

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7 changes: 4 additions & 3 deletions Detectors/Upgrades/ALICE3/Passive/include/Alice3DetectorsPassive/PassiveBaseParam.h
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Original file line number Diff line number Diff line change
Expand Up @@ -31,14 +31,15 @@ enum MagnetLayout : int {

enum DetLayout : int {
StandardRadius = 0,
ReducedRadius = 1
ReducedRadius = 1,
Version2 = 2 // Specs from engineering note 2026-05-06
};

struct Alice3PassiveBaseParam : public o2::conf::ConfigurableParamHelper<Alice3PassiveBaseParam> {
// Geometry Builder parameters

int mLayout = MagnetLayout::AluminiumStabilizer;
int mDetLayout = DetLayout::StandardRadius;
MagnetLayout mLayout = MagnetLayout::AluminiumStabilizer; // Magnet layout: Aluminium or Copper stabilizer
DetLayout mDetLayout = DetLayout::StandardRadius; // Detector layout: Standard or Reduced radius

O2ParamDef(Alice3PassiveBaseParam, "Alice3PassiveBase");
};
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1 change: 1 addition & 0 deletions Detectors/Upgrades/ALICE3/Passive/src/Absorber.cxx
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Expand Up @@ -154,6 +154,7 @@ void Alice3Absorber::ConstructGeometry()
absorings->DefineSection(17, -500, 236, 274);
break;
case o2::passive::DetLayout::ReducedRadius:
case o2::passive::DetLayout::Version2:
absorings->DefineSection(0, 500, 201, 239);
absorings->DefineSection(1, 400, 201, 239);
absorings->DefineSection(2, 400, 197.5, 242.5);
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19 changes: 19 additions & 0 deletions Detectors/Upgrades/ALICE3/Passive/src/Magnet.cxx
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Expand Up @@ -107,6 +107,8 @@ void Alice3Magnet::ConstructGeometry()
// Passive Base configuration parameters
auto& passiveBaseParam = Alice3PassiveBaseParam::Instance();

const bool isVersion2 = (passiveBaseParam.mDetLayout == o2::passive::DetLayout::Version2);

switch (passiveBaseParam.mDetLayout) {
case o2::passive::DetLayout::StandardRadius:
// Defined in the header file
Expand All @@ -122,6 +124,19 @@ void Alice3Magnet::ConstructGeometry()
mOuterWrapThickness = 3.f; // cm
mZLength = 800.f; // cm
break;
case o2::passive::DetLayout::Version2:
// Engineering note 2026-05-06 baseline stack (radial):
// inner wall 3 mm + winding pack 48 mm + support cylinder 20 mm + MLI 2 mm + outer wall 3 mm.
mInnerWrapInnerRadius = 125.f; // cm
mInnerWrapThickness = 0.3f; // cm
mCoilInnerRadius = mInnerWrapInnerRadius + mInnerWrapThickness; // cm
mCoilThickness = 4.8f; // cm
mRestMaterialRadius = mCoilInnerRadius + mCoilThickness; // cm
mRestMaterialThickness = 2.2f; // cm
mOuterWrapInnerRadius = mRestMaterialRadius + mRestMaterialThickness; // cm
mOuterWrapThickness = 0.3f; // cm
mZLength = 800.f; // cm
break;
default:
LOG(fatal) << "Unknown detector layout " << passiveBaseParam.mDetLayout;
break;
Expand All @@ -133,6 +148,10 @@ void Alice3Magnet::ConstructGeometry()
// Handled in the header file
break;
case o2::passive::MagnetLayout::CopperStabilizer:
if (isVersion2) {
LOG(warn) << "Alice 3 magnet: CopperStabilizer override ignored for Version2 (engineering-note stack)";
break;
}
doCopperStabilizer = true;
mRestMaterialThickness -= 3.3; // cm Remove the Aluminium stabiliser
mRestMaterialThickness += 2.2; // cm Add the Copper stabiliser
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