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Merged
njacazio merged 6 commits into from
Sep 19, 2025
Merged

[ALICE3] Update a3 geo in fasttracker #13042

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0c6cf85
Update a3 geo in fasttracker
jesgum Sep 19, 2025
37fe29a
Update
jesgum Sep 19, 2025
49449fd
Add iTOF
jesgum Sep 19, 2025
647e4ac
Formatting
jesgum Sep 19, 2025
b9a2f46
make megalinter happy
jesgum Sep 19, 2025
62a82d2
fix compilation issue
jesgum Sep 19, 2025
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39 changes: 27 additions & 12 deletions ALICE3/Core/FastTracker.cxx
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Expand Up @@ -144,27 +144,42 @@
AddLayer("B10", 80., 250, x0OT, xrhoOT, resRPhiOT, resZOT, eff, 1);
}

void FastTracker::AddSiliconALICE3(std::vector<float> pixelResolution)
void FastTracker::AddSiliconALICE3(float scaleX0VD, std::vector<float> pixelResolution)
{
float x0IT = 0.001; // 0.1%
float x0Pipe0 = 0.001592; // 200 um AlBe
float x0VDL0 = 0.00076; // 30 um Si + 50 um glue + carbon foam 0.03%
float x0VDL1 = 0.00096; // 30 um Si + 50 um glue + carbon foam 0.05%
float x0VDL2 = 0.00167; // 30 um Si + 50 um glue + carbon foam 0.05% + 0.07% Be case
float x0Coldplate = 0.02f; // (1.5 mm Al2O3 2%)
float x0Pipe1 = 0.0023f; // 800 um Be
float x0OT = 0.01; // 1.0%
float xrhoIB = 2.3292e-02; // 100 mum Si
float xrhoOT = 2.3292e-01; // 1000 mum Si
float eff = 1.00;
float x0iTOF = x0OT * 3.;

float resRPhiIT = pixelResolution[0];
float resZIT = pixelResolution[1];
float resRPhiVD = pixelResolution[0];
float resZVD = pixelResolution[1];
float resRPhiOT = pixelResolution[2];
float resZOT = pixelResolution[3];

AddLayer("bpipe0", 0.48, 250, 0.00042, 2.772e-02, 0.0f, 0.0f, 0.0f, 0); // 150 mum Be
AddLayer("B00", 0.5, 250, x0IT, xrhoIB, resRPhiIT, resZIT, eff, 1);
AddLayer("B01", 1.2, 250, x0IT, xrhoIB, resRPhiIT, resZIT, eff, 1);
AddLayer("B02", 2.5, 250, x0IT, xrhoIB, resRPhiIT, resZIT, eff, 1);
AddLayer("bpipe1", 3.7, 250, 0.0014, 9.24e-02, 0.0f, 0.0f, 0.0f, 0); // 500 mum Be
float xrhoPipe0 = 0;
float xrhoVDL0 = 0;
float xrhoVDL1 = 0;
float xrhoVDL2 = 0;
float xrhoColdplate = 0;
float xrhoPipe1 = 0;
float xrhoOT = 2.3292e-01;
float xrhoiTOF = 0.03;
float eff = 1.00;

AddLayer("bpipe0", 0.48, 250, x0Pipe0, xrhoPipe0, 0.0f, 0.0f, 0.0f, 0);
AddLayer("B00", 0.5, 250, x0VDL0 * scaleX0VD, xrhoVDL0, resRPhiVD, resZVD, eff, 1);
AddLayer("B01", 1.2, 250, x0VDL1 * scaleX0VD, xrhoVDL1, resRPhiVD, resZVD, eff, 1);
AddLayer("B02", 2.5, 250, x0VDL2 * scaleX0VD, xrhoVDL2, resRPhiVD, resZVD, eff, 1);
AddLayer("coldplate", 2.6, 250, x0Coldplate, xrhoColdplate, 0.0f, 0.0f, 0.0f, 0);
AddLayer("bpipe1", 5.7, 250, x0Pipe1, xrhoPipe1, 0.0f, 0.0f, 0.0f, 0);
AddLayer("B03", 7., 250, x0OT, xrhoOT, resRPhiOT, resZOT, eff, 1);
AddLayer("B04", 9., 250, x0OT, xrhoOT, resRPhiOT, resZOT, eff, 1);
AddLayer("B05", 12., 250, x0OT, xrhoOT, resRPhiOT, resZOT, eff, 1);
AddLayer("iTOF", 19, 250, x0iTOF, xrhoiTOF, resRPhiOT, resZOT, eff, 0);
AddLayer("B06", 20., 250, x0OT, xrhoOT, resRPhiOT, resZOT, eff, 1);
AddLayer("B07", 30., 250, x0OT, xrhoOT, resRPhiOT, resZOT, eff, 1);
AddLayer("B08", 45., 250, x0OT, xrhoOT, resRPhiOT, resZOT, eff, 1);
Expand Down Expand Up @@ -204,8 +219,8 @@
for (int i = 0; i < kNPassiveBound; i++) {
AddLayer(Form("tpc_boundary%d", i), rBoundary[i], zLength, radLBoundary[i], xrhoBoundary[i], 0); // dummy errors
}
for (Int_t k = 0; k < tpcRows; k++) {

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
Float_t rowRadius = 0;

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
if (k < innerRows)
rowRadius = rowOneRadius + k * tpcInnerRadialPitch;
else if (k >= innerRows && k < (innerRows + middleRows))
Expand All @@ -232,7 +247,7 @@
index = 1;
z0 = -4 * sigmaD + i * dz0;
dist += index * (dz0 / 3.) * (1 / o2::math_utils::sqrt(o2::constants::math::TwoPI) / sigmaD) * std::exp(-z0 * z0 / 2. / sigmaD / sigmaD) * (1 / o2::math_utils::sqrt((z - z0) * (z - z0) + r * r));
if (index != 4)

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
index = 4;
else
index = 2;
Expand Down Expand Up @@ -362,7 +377,7 @@
// check if layer is reached
float targetX = 1e+3;
inputTrack.getXatLabR(layers[il].getRadius(), targetX, magneticField);
if (targetX > 999.f) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
LOGF(debug, "Failed to find intercept for layer %d at radius %.2f cm", il, layers[il].getRadius());
break; // failed to find intercept
}
Expand Down Expand Up @@ -439,7 +454,7 @@

float targetX = 1e+3;
inputTrack.getXatLabR(layers[il].getRadius(), targetX, magneticField);
if (targetX > 999)

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
continue; // failed to find intercept

if (!inputTrack.propagateTo(targetX, magneticField)) {
Expand Down Expand Up @@ -511,7 +526,7 @@
// backpropagate to original radius
float finalX = 1e+3;
bool inPropStatus = inwardTrack.getXatLabR(initialRadius, finalX, magneticField);
if (finalX > 999) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
LOG(debug) << "Failed to find intercept for initial radius " << initialRadius << " cm, x = " << finalX << " and status " << inPropStatus << " and sn = " << inwardTrack.getSnp() << " r = " << inwardTrack.getY() * inwardTrack.getY();
return -3; // failed to find intercept
}
Expand All @@ -521,7 +536,7 @@
}

// only attempt to continue if intercepts are at least four
if (nIntercepts < 4)

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[magic-number] 

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return nIntercepts;

// generate efficiency
Expand Down Expand Up @@ -565,7 +580,7 @@
if (fcovm[ii][jj] * fcovm[ii][jj] > std::abs(fcovm[ii][ii] * fcovm[jj][jj])) {
rubenConditional = true;
if (makePositiveDefinite) {
fcovm[ii][jj] = TMath::Sign(1, fcovm[ii][jj]) * covMatFactor * sqrt(std::abs(fcovm[ii][ii] * fcovm[jj][jj]));

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[std-prefix] 

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}
}
}
Expand Down Expand Up @@ -603,7 +618,7 @@
for (int j = 0; j < 5; ++j)
val += eigVec[j][ii] * outputTrack.getParam(j);
// smear parameters according to eigenvalues
params_[ii] = gRandom->Gaus(val, sqrt(eigVal[ii]));

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}

// invert eigenvector matrix
Expand All @@ -616,7 +631,7 @@
outputTrack.setParam(val, ii);
}
// should make a sanity check that par[2] sin(phi) is in [-1, 1]
if (fabs(outputTrack.getParam(2)) > 1.) {

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LOG(info) << " --- smearTrack failed sin(phi) sanity check: " << outputTrack.getParam(2);
return -2;
}
Expand Down
2 changes: 1 addition & 1 deletion ALICE3/Core/FastTracker.h
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Expand Up @@ -59,7 +59,7 @@ class FastTracker

void AddSiliconALICE3v4(std::vector<float> pixelResolution);
void AddSiliconALICE3v2(std::vector<float> pixelResolution);
void AddSiliconALICE3(std::vector<float> pixelResolution);
void AddSiliconALICE3(float scaleX0VD, std::vector<float> pixelResolution);
void AddTPC(float phiResMean, float zResMean);

void Print();
Expand Down
25 changes: 18 additions & 7 deletions ALICE3/TableProducer/OTF/onTheFlyTracker.cxx
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Expand Up @@ -138,11 +138,12 @@ struct OnTheFlyTracker {
Configurable<int> minSiliconHits{"minSiliconHits", 6, "minimum number of silicon hits to accept track"};
Configurable<int> minSiliconHitsIfTPCUsed{"minSiliconHitsIfTPCUsed", 2, "minimum number of silicon hits to accept track in case TPC info is present"};
Configurable<int> minTPCClusters{"minTPCClusters", 70, "minimum number of TPC hits necessary to consider minSiliconHitsIfTPCUsed"};
Configurable<int> alice3detector{"alice3detector", 0, "0: ALICE 3 v1, 1: ALICE 3 v4"};
Configurable<int> alice3detector{"alice3detector", 2, "0: ALICE 3 v1, 1: ALICE 3 v4, 2: ALICE 3 Sep 2025"};
Configurable<bool> applyZacceptance{"applyZacceptance", false, "apply z limits to detector layers or not"};
Configurable<bool> applyMSCorrection{"applyMSCorrection", true, "apply ms corrections for secondaries or not"};
Configurable<bool> applyElossCorrection{"applyElossCorrection", true, "apply eloss corrections for secondaries or not"};
Configurable<bool> applyEffCorrection{"applyEffCorrection", true, "apply efficiency correction or not"};
Configurable<int> scaleVD{"scaleVD", 1, "scale x0 and xrho in VD layers"};
Configurable<std::vector<float>> pixelRes{"pixelRes", {0.00025, 0.00025, 0.001, 0.001}, "RPhiIT, ZIT, RPhiOT, ZOT"};
} fastTrackerSettings; // allows for gap between peak and bg in case someone wants to

Expand Down Expand Up @@ -412,12 +413,22 @@ struct OnTheFlyTracker {
fastTracker.SetApplyMSCorrection(fastTrackerSettings.applyMSCorrection);
fastTracker.SetApplyElossCorrection(fastTrackerSettings.applyElossCorrection);

if (fastTrackerSettings.alice3detector == 0) {
fastTracker.AddSiliconALICE3v2(fastTrackerSettings.pixelRes);
}
if (fastTrackerSettings.alice3detector == 1) {
fastTracker.AddSiliconALICE3v4(fastTrackerSettings.pixelRes);
fastTracker.AddTPC(0.1, 0.1);
switch (fastTrackerSettings.alice3detector) {
case 0:
fastTracker.AddSiliconALICE3v2(fastTrackerSettings.pixelRes);
break;

case 1:
fastTracker.AddSiliconALICE3v4(fastTrackerSettings.pixelRes);
fastTracker.AddTPC(0.1, 0.1);
break;

case 2:
fastTracker.AddSiliconALICE3(fastTrackerSettings.scaleVD, fastTrackerSettings.pixelRes);
break;

default:
break;
}

// print fastTracker settings
Expand Down
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