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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

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[MID] Add superconducting magnet/cryostat geometry to simulation
joseesquivel-hub Jun 30, 2026
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joseesquivel-hub Jun 30, 2026
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[MI3] Add superconducting magnet/cryostat geometry to ALICE3 MID simu…
joseesquivel-hub Jul 7, 2026
b4c56ed
[ALICE3] Magnet: add WindingPack (NbTi+Cu+Al) coil material option
joseesquivel-hub Jul 13, 2026
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3 changes: 2 additions & 1 deletion Detectors/Upgrades/ALICE3/Passive/include/Alice3DetectorsPassive/PassiveBaseParam.h
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Expand Up @@ -26,7 +26,8 @@ namespace passive

enum MagnetLayout : int {
AluminiumStabilizer = 0,
CopperStabilizer = 1
CopperStabilizer = 1,
WindingPack = 2
};

enum DetLayout : int {
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18 changes: 17 additions & 1 deletion Detectors/Upgrades/ALICE3/Passive/src/Magnet.cxx
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Expand Up @@ -98,6 +98,16 @@ void Alice3Magnet::createMaterials()
matmgr.Medium("ALICE3_MAGNET", 1, "VACUUM", 1, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
matmgr.Medium("ALICE3_MAGNET", 9, "ALUMINIUM", 9, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
matmgr.Medium("ALICE3_MAGNET", 19, "COPPER", 19, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);

// WindingPack: NbTi+Cu+Al composite (Arnaud report v0.2)
// Mass fractions: NbTi=8.10% (Nb=4.05%, Ti=4.05%), Cu=11.18%, Al=80.72%
// Density: 2.96 g/cm3
float aWP[4] = {92.90638f, 47.867f, 63.546f, 26.982f};
float zWP[4] = {41.f, 22.f, 29.f, 13.f};
float wWP[4] = {0.0405f, 0.0405f, 0.1118f, 0.8072f};
float dWP = 2.96f;
matmgr.Mixture("ALICE3_MAGNET", 29, "WINDINGPACK", aWP, zWP, dWP, 4, wWP);
matmgr.Medium("ALICE3_MAGNET", 29, "WINDINGPACK", 29, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
}

void Alice3Magnet::ConstructGeometry()
Expand Down Expand Up @@ -128,6 +138,7 @@ void Alice3Magnet::ConstructGeometry()
}

bool doCopperStabilizer = false;
bool doWindingPack = false;
switch (passiveBaseParam.mLayout) {
case o2::passive::MagnetLayout::AluminiumStabilizer:
// Handled in the header file
Expand All @@ -138,6 +149,10 @@ void Alice3Magnet::ConstructGeometry()
mRestMaterialThickness += 2.2; // cm Add the Copper stabiliser
LOG(debug) << "Alice 3 magnet: using Copper Stabilizer with thickness " << mRestMaterialThickness << " cm";
break;
case o2::passive::MagnetLayout::WindingPack:
doWindingPack = true;
LOG(debug) << "Alice 3 magnet: using WindingPack (NbTi+Cu+Al) coil";
break;
default:
LOG(fatal) << "Unknown magnet layout " << passiveBaseParam.mLayout;
break;
Expand All @@ -152,6 +167,7 @@ void Alice3Magnet::ConstructGeometry()
auto& matmgr = o2::base::MaterialManager::Instance();
auto kMedAl = matmgr.getTGeoMedium("ALICE3_MAGNET_ALUMINIUM");
auto kMedCu = matmgr.getTGeoMedium("ALICE3_MAGNET_COPPER");
auto kMedWP = matmgr.getTGeoMedium("ALICE3_MAGNET_WINDINGPACK");
auto kMedVac = matmgr.getTGeoMedium("ALICE3_MAGNET_VACUUM");

// inner wrap
Expand All @@ -169,7 +185,7 @@ void Alice3Magnet::ConstructGeometry()

TGeoVolume* innerWrapVol = new TGeoVolume("innerWrap", innerLayer, kMedAl);
TGeoVolume* innerVacuumVol = new TGeoVolume("innerVacuum", innerVacuum, kMedVac);
TGeoVolume* coilsVol = new TGeoVolume("coils", coilsLayer, kMedCu);
TGeoVolume* coilsVol = new TGeoVolume("coils", coilsLayer, doWindingPack ? kMedWP : kMedCu);
TGeoVolume* restMaterialVol = new TGeoVolume("restMaterial", restMaterial, doCopperStabilizer ? kMedCu : kMedAl);
TGeoVolume* outerVacuumVol = new TGeoVolume("outerVacuum", outerVacuum, kMedVac);
TGeoVolume* outerWrapVol = new TGeoVolume("outerWrap", outerLayer, kMedAl);
Expand Down