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[ALICE3] TF3: remove overlaps in OTOF staves #15633

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Merged
njacazio merged 1 commit into from
Jul 25, 2026
+2 −7
Merged

[ALICE3] TF3: remove overlaps in OTOF staves #15633

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9 changes: 2 additions & 7 deletions Detectors/Upgrades/ALICE3/IOTOF/simulation/src/Layer.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -331,14 +331,9 @@ void OTOFLayer::createLayer(TGeoVolume* motherVolume)
<< " is not divisible by modulesPerStaveX=" << modulesPerStaveX;
}
const int modulesPerStaveZ = mModulesPerStave / modulesPerStaveX;
const double moduleOverlapZ = 0.7; // cm, 7 mm longitudinal overlap from oTOF V2 specs
const double moduleSizeX = staveSizeX / modulesPerStaveX;
const double moduleSizeY = staveSizeY;
const double moduleSizeZ = (staveSizeZ + (modulesPerStaveZ - 1) * moduleOverlapZ) / modulesPerStaveZ;
const double modulePitchZ = moduleSizeZ - moduleOverlapZ;
if (modulePitchZ <= 0.0) {
LOG(fatal) << "Invalid oTOF module overlap " << moduleOverlapZ << " cm for module size " << moduleSizeZ << " cm";
}
const double moduleSizeZ = staveSizeZ / modulesPerStaveZ;
TGeoBBox* module = new TGeoBBox(moduleSizeX * 0.5, moduleSizeY * 0.5, moduleSizeZ * 0.5);
TGeoVolume* moduleVol = new TGeoVolume(moduleName, module, medAir);
setModuleStyle(moduleVol);
Expand Down Expand Up @@ -389,7 +384,7 @@ void OTOFLayer::createLayer(TGeoVolume* motherVolume)
for (int j = 0; j < modulesPerStaveZ; ++j) {
LOGP(info, "oTOF: Creating module {}/{} for stave {}/{}", i + 1, modulesPerStaveX, j + 1, modulesPerStaveZ);
const double tx = (i + 0.5) * moduleSizeX - 0.5 * staveSizeX;
const double tz = -0.5 * staveSizeZ + 0.5 * moduleSizeZ + j * modulePitchZ;
const double tz = -0.5 * staveSizeZ + (j + 0.5) * moduleSizeZ;
auto* translation = new TGeoTranslation(tx, 0, tz);
staveVol->AddNode(moduleVol, 1 + i * modulesPerStaveZ + j, translation);
}
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