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[ALICE3] Change 'layoutOL' to 'layoutOT', update ALICE3/README with a config table #15101

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njacazio merged 4 commits into from
Feb 26, 2026
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[ALICE3] Change 'layoutOL' to 'layoutOT', update ALICE3/README with a config table #15101

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2c15fbb
change 'layoutOL' to 'layoutOT' for consistency
Feb 25, 2026
af3308b
small updates of readme
Feb 25, 2026
ceeaa70
Update README.md
njacazio Feb 26, 2026
7f1d8de
Document specific detector setup for TRK
njacazio Feb 26, 2026
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17 changes: 12 additions & 5 deletions Detectors/Upgrades/ALICE3/README.md
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Expand Up @@ -21,7 +21,7 @@ The specific modules for Run 5 are enabled by passing their their IDs to the `-m
A list of the available DetIDs is reproted in the table below:

| Detector ID | Detector description |
|-------------|----------------------------------|
| ----------- | -------------------------------- |
| `A3IP` | Beam pipe |
| `TRK` | Barrel Tracker |
| `TF3` | Time Of Flight detectors |
Expand Down Expand Up @@ -49,7 +49,7 @@ export ALICE3_MAGFIELD_MACRO=../ALICE3Field.C

An exampling macro for a custom magnetic field is stored in `Detectors/Upgrades/macros/ALICE3Field.C`.

### Run a simple simulation for run 5
### Run a simple simulation for ALICE 3
The simplest command to be run to test the simulation is working is:

```bash
Expand All @@ -61,13 +61,20 @@ To enable a specific set of modules, e.g. the beampipe and the TOFs one can spec
```bash
o2-sim-run5 -n 10 -m A3IP TF3
```

#### Specific detector setups

Configurables for various sub-detectors are presented in the following Table:

| Available options | Link to options |
| ----------------- | -------------------------------------------------------------- |
| TKR | [Link to TRK options](./TRK/README.md#specific-detector-setup) |

### Output of the simulation
The simulation will produce a `o2sim_Hits<DetID>.root` file with a tree with the hits related to that detector.
Currently, hits are produced for: `TRK`, `FT3`, and `TF3`.
More detectors will be included.

## Reconstruction
WIP

## Analysis
WIP
WIP
20 changes: 19 additions & 1 deletion Detectors/Upgrades/ALICE3/TRK/README.md
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Expand Up @@ -6,5 +6,23 @@

This is top page for the TRK detector documentation.


## Specific detector setup


Configurables for various sub-detectors are presented in the following Table:

| Subsystem | Available options | Comments |
| ------------------ | ------------------------------------------------------- | ---------------------------------------------------------------- |
| `TRKBase.layoutVD` | `kIRIS4` (default), `kIRISFullCyl`, `kIRIS5`, `kIRIS4a` | [link to definitions](./base/include/TRKBase/TRKBaseParam.h) |
| `TRKBase.layoutML` | `kCylinder`, `kTurboStaves` (default), `kStaggered` | |
| `TRKBase.layoutOT` | `kCylinder`, `kTurboStaves`, `kStaggered` (default) | |

For example, a geometry with fully cylindrical tracker barrel (for all layers in VD, ML and OT) can be obtained by
```bash
o2-sim-serial-run5 -n 1 -g pythia8hi -m A3IP TRK FT3 TF3 \
--configKeyValues "TRKBase.layoutVD=kIRISFullCyl;TRKBase.layoutML=kCylinder;TRKBase.layoutOL=kCylinder"
```

<!-- doxy
/doxy -->
/doxy -->
2 changes: 1 addition & 1 deletion Detectors/Upgrades/ALICE3/TRK/base/include/TRKBase/GeometryTGeo.h
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Expand Up @@ -223,7 +223,7 @@ class GeometryTGeo : public o2::detectors::DetMatrixCache
std::vector<float> mCacheRefAlphaMLOT; /// cache for sensor ref alpha ML and OT

eLayout mLayoutML; // Type of segmentation for the middle layers
eLayout mLayoutOL; // Type of segmentation for the outer layers
eLayout mLayoutOT; // Type of segmentation for the outer layers

private:
static std::unique_ptr<o2::trk::GeometryTGeo> sInstance;
Expand Down
4 changes: 2 additions & 2 deletions Detectors/Upgrades/ALICE3/TRK/base/include/TRKBase/TRKBaseParam.h
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Expand Up @@ -46,11 +46,11 @@ struct TRKBaseParam : public o2::conf::ConfigurableParamHelper<TRKBaseParam> {
eOverallGeom overallGeom = kDefaultRadii; // Overall geometry option, to be used in Detector::buildTRKMiddleOuterLayers

eLayout layoutML = kTurboStaves; // Type of segmentation for the middle layers
eLayout layoutOL = kStaggered; // Type of segmentation for the outer layers
eLayout layoutOT = kStaggered; // Type of segmentation for the outer layers
eVDLayout layoutVD = kIRIS4; // VD detector layout design

eLayout getLayoutML() const { return layoutML; }
eLayout getLayoutOL() const { return layoutOL; }
eLayout getLayoutOT() const { return layoutOT; }
eVDLayout getLayoutVD() const { return layoutVD; }

O2ParamDef(TRKBaseParam, "TRKBase");
Expand Down
6 changes: 3 additions & 3 deletions Detectors/Upgrades/ALICE3/TRK/base/src/GeometryTGeo.cxx
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Expand Up @@ -77,9 +77,9 @@ void GeometryTGeo::Build(int loadTrans)
}

mLayoutML = o2::trk::TRKBaseParam::Instance().getLayoutML();
mLayoutOL = o2::trk::TRKBaseParam::Instance().getLayoutOL();
mLayoutOT = o2::trk::TRKBaseParam::Instance().getLayoutOT();

LOG(debug) << "Layout ML: " << mLayoutML << ", Layout OL: " << mLayoutOL;
LOG(debug) << "Layout ML: " << mLayoutML << ", Layout OL: " << mLayoutOT;

mNumberOfLayersMLOT = extractNumberOfLayersMLOT();
mNumberOfPetalsVD = extractNumberOfPetalsVD();
Expand Down Expand Up @@ -405,7 +405,7 @@ TString GeometryTGeo::getMatrixPath(int index) const
// handling cylindrical configuration for ML and/or OT
// needed bercause of the different numbering scheme in the geometry for the cylindrical case wrt the staggered and turbo ones
if (subDetID == 1) {
if ((layer < 4 && mLayoutML == eLayout::kCylinder) || (layer > 3 && mLayoutOL == eLayout::kCylinder)) {
if ((layer < 4 && mLayoutML == eLayout::kCylinder) || (layer > 3 && mLayoutOT == eLayout::kCylinder)) {
stave = 1;
mod = 1;
chip = 1;
Expand Down
2 changes: 1 addition & 1 deletion Detectors/Upgrades/ALICE3/TRK/macros/test/run_test.sh
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Expand Up @@ -2,7 +2,7 @@
nEvents=10

# Simulating
o2-sim-serial-run5 -n $nEvents -g pythia8hi -m TRK --configKeyValues "TRKBase.layoutML=kTurboStaves;TRKBase.layoutOL=kStaggered;">& sim_TRK.log
o2-sim-serial-run5 -n $nEvents -g pythia8hi -m TRK --configKeyValues "TRKBase.layoutML=kTurboStaves;TRKBase.layoutOT=kStaggered;">& sim_TRK.log

# Digitizing
o2-sim-digitizer-workflow -b >& digiTRK.log
Expand Down
8 changes: 4 additions & 4 deletions Detectors/Upgrades/ALICE3/TRK/simulation/src/Detector.cxx
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Expand Up @@ -146,10 +146,10 @@ void Detector::buildTRKMiddleOuterLayers()
mLayers[3].setLayout(trkPars.layoutML);

// Outer tracker
mLayers[4].setLayout(trkPars.layoutOL);
mLayers[5].setLayout(trkPars.layoutOL);
mLayers[6].setLayout(trkPars.layoutOL);
mLayers[7].setLayout(trkPars.layoutOL);
mLayers[4].setLayout(trkPars.layoutOT);
mLayers[5].setLayout(trkPars.layoutOT);
mLayers[6].setLayout(trkPars.layoutOT);
mLayers[7].setLayout(trkPars.layoutOT);
}

void Detector::configFromFile(std::string fileName)
Expand Down
2 changes: 1 addition & 1 deletion Detectors/Upgrades/ALICE3/TRK/workflow/README.md
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Expand Up @@ -98,7 +98,7 @@ Note that the `trackingparams` field can contain multiple sets of parameters for
First, generate simulation data:

```bash
o2-sim-serial-run5 -n 200 -g pythia8hi -m TRK --configKeyValues "Diamond.width[0]=0.01;Diamond.width[1]=0.01;Diamond.width[2]=5;TRKBase.layoutML=kTurboStaves;TRKBase.layoutOL=kStaggered;"
o2-sim-serial-run5 -n 200 -g pythia8hi -m TRK --configKeyValues "Diamond.width[0]=0.01;Diamond.width[1]=0.01;Diamond.width[2]=5;TRKBase.layoutML=kTurboStaves;TRKBase.layoutOT=kStaggered;"
```

This produces, among other files:
Expand Down