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Let the ZEM calorimeters be built without the far beam line #15752

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Let the ZEM calorimeters be built without the far beam line #15752

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07719f4
Let the ZEM calorimeters be built without the far beam line
sawenzel Sep 2, 2026
6b1f1fc
Please consider the following formatting changes
alibuild Sep 2, 2026
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2 changes: 2 additions & 0 deletions Detectors/ZDC/simulation/include/ZDCSimulation/Detector.h
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Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,8 @@ class Detector : public o2::base::DetImpl<Detector>
void createCsideBeamLine();
void createMagnets();
void createDetectors();
void createZNZP();
void createZEM();

// determine detector; sector/tower and impact coordinates given volumename and position
void getDetIDandSecID(TString const& volname, math_utils::Vector3D<float> const& x,
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5 changes: 5 additions & 0 deletions Detectors/ZDC/simulation/include/ZDCSimulation/ZDCSimParam.h
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Expand Up @@ -24,6 +24,11 @@ namespace zdc
struct ZDCSimParam : public o2::conf::ConfigurableParamHelper<ZDCSimParam> {

bool continuous = true; ///< flag for continuous simulation
/// Build the +-113 m beam line, its magnets and the ZN/ZP calorimeters that sit
/// there. This is what the ZDC costs in transport time; turning it off leaves the
/// ZEM calorimeters at z ~ 7.6 m in the geometry.
bool buildBeamLine = true;
bool buildZEM = true; ///< build the ZEM calorimeters
int nBCAheadCont = 1; ///< number of BC to read ahead of trigger in continuous mode
int nBCAheadTrig = 3; ///< number of BC to read ahead of trigger in triggered mode
bool recordSpatialResponse = false; ///< whether to record 2D spatial response showering images in proton/neutron detector
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87 changes: 58 additions & 29 deletions Detectors/ZDC/simulation/src/Detector.cxx
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Expand Up @@ -217,47 +217,54 @@ void Detector::ConstructGeometry()

createMaterials();

createAsideBeamLine();
createCsideBeamLine();
createMagnets();
if (ZDCSimParam::Instance().buildBeamLine) {
createAsideBeamLine();
createCsideBeamLine();
createMagnets();
} else {
LOG(info) << "ZDC: beam line, magnets and the ZN/ZP calorimeters are not built";
}
createDetectors();
}

//_____________________________________________________________________________
void Detector::defineSensitiveVolumes()
{
LOG(info) << "defining sensitive for ZDC";
auto vol = gGeoManager->GetVolume("ZNENV");
if (vol) {
AddSensitiveVolume(vol);
mZNENVVolID = vol->GetNumber(); // initialize id

AddSensitiveVolume(gGeoManager->GetVolume("ZNF1"));
AddSensitiveVolume(gGeoManager->GetVolume("ZNF2"));
AddSensitiveVolume(gGeoManager->GetVolume("ZNF3"));
AddSensitiveVolume(gGeoManager->GetVolume("ZNF4"));
} else {
LOG(fatal) << "can't find volume ZNENV";
}
vol = gGeoManager->GetVolume("ZPENV");
if (vol) {
AddSensitiveVolume(vol);
mZPENVVolID = vol->GetNumber(); // initialize id

AddSensitiveVolume(gGeoManager->GetVolume("ZPF1"));
AddSensitiveVolume(gGeoManager->GetVolume("ZPF2"));
AddSensitiveVolume(gGeoManager->GetVolume("ZPF3"));
AddSensitiveVolume(gGeoManager->GetVolume("ZPF4"));
} else {
LOG(fatal) << "can't find volume ZPENV";
TGeoVolume* vol = nullptr;
if (ZDCSimParam::Instance().buildBeamLine) {
vol = gGeoManager->GetVolume("ZNENV");
if (vol) {
AddSensitiveVolume(vol);
mZNENVVolID = vol->GetNumber(); // initialize id

AddSensitiveVolume(gGeoManager->GetVolume("ZNF1"));
AddSensitiveVolume(gGeoManager->GetVolume("ZNF2"));
AddSensitiveVolume(gGeoManager->GetVolume("ZNF3"));
AddSensitiveVolume(gGeoManager->GetVolume("ZNF4"));
} else {
LOG(fatal) << "can't find volume ZNENV";
}
vol = gGeoManager->GetVolume("ZPENV");
if (vol) {
AddSensitiveVolume(vol);
mZPENVVolID = vol->GetNumber(); // initialize id

AddSensitiveVolume(gGeoManager->GetVolume("ZPF1"));
AddSensitiveVolume(gGeoManager->GetVolume("ZPF2"));
AddSensitiveVolume(gGeoManager->GetVolume("ZPF3"));
AddSensitiveVolume(gGeoManager->GetVolume("ZPF4"));
} else {
LOG(fatal) << "can't find volume ZPENV";
}
}
// em calorimeter
vol = gGeoManager->GetVolume("ZEM ");
if (vol) {
AddSensitiveVolume(vol);
mZEMVolID = vol->GetNumber();
AddSensitiveVolume(gGeoManager->GetVolume("ZEMF"));
} else {
} else if (ZDCSimParam::Instance().buildZEM) {
LOG(fatal) << "can't find volume ZEM";
}
}
Expand Down Expand Up @@ -2068,6 +2075,22 @@ void Detector::createMagnets()
}
//_____________________________________________________________________________
void Detector::createDetectors()
{
// ProcessHits compares the medium of every step against these two, for ZEM as
// much as for ZN and ZP, so they have to be resolved whatever is built.
mMediumPMCid = getMediumID(kSiO2pmc);
mMediumPMQid = getMediumID(kSiO2pmq);

// ZN and ZP sit in the ZDCA/ZDCC mother volumes that the beam line builds, so
// they stand or fall with it. ZEM is at z = 7.6 m and is built either way.
if (ZDCSimParam::Instance().buildBeamLine) {
createZNZP();
}
createZEM();
}

//_____________________________________________________________________________
void Detector::createZNZP()
{
// Create the ZDCs

Expand All @@ -2082,8 +2105,6 @@ void Detector::createDetectors()

// -------------------------------------------------------------------------------
//--> Neutron calorimeter (ZN)
mMediumPMCid = getMediumID(kSiO2pmc);
mMediumPMQid = getMediumID(kSiO2pmq);

// an envelop volume for the purpose of registering particles entering the detector
double eps = 0.1; // 1 mm
Expand Down Expand Up @@ -2299,9 +2320,17 @@ void Detector::createDetectors()
TVirtualMC::GetMC()->Gspos("ZPBS", 2, "ZDCC", Geometry::ZPCPOSITION[0] - Geometry::ZPDIMENSION[0] - zpSupportWallside[0], Geometry::ZPCPOSITION[1] + 0.75, Geometry::ZPCPOSITION[2] - zpSupportWallside[2], 0, "ONLY");
TVirtualMC::GetMC()->Gspos("ZPBS", 3, "ZDCA", Geometry::ZPAPOSITION[0] + Geometry::ZPDIMENSION[0] + zpSupportWallside[0], Geometry::ZPAPOSITION[1] + 0.75, Geometry::ZPAPOSITION[2] + zpSupportWallside[2], 0, "ONLY");
TVirtualMC::GetMC()->Gspos("ZPBS", 4, "ZDCA", Geometry::ZPAPOSITION[0] - Geometry::ZPDIMENSION[0] - zpSupportWallside[0], Geometry::ZPAPOSITION[1] + 0.75, Geometry::ZPAPOSITION[2] + zpSupportWallside[2], 0, "ONLY");
}

//_____________________________________________________________________________
void Detector::createZEM()
{
// -------------------------------------------------------------------------------
// -> EM calorimeter (ZEM)
if (!ZDCSimParam::Instance().buildZEM) {
LOG(warning) << "ZDC: the ZEM calorimeters are not built";
return;
}
int32_t irotzem1, irotzem2;
double rangzem1[6] = {0., 0., 90., 90., -90., 0.};
double rangzem2[6] = {180., 0., 90., 45. + 90., 90., 45.};
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