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Merged
fgrosa merged 5 commits into from
Jun 24, 2025
Merged

ITS3: move the energy deposition wrt. centre of response #14415

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f790fd5
move the energy deposition wrt. centre of response
ChunzhengLab Jun 17, 2025
6c8c904
fix the order of IB/OB for noise seeding
ChunzhengLab Jun 17, 2025
ccd75ae
print out the resp centre in the CheckChipResponseFile
ChunzhengLab Jun 17, 2025
fb4c608
find the real centre
ChunzhengLab Jun 19, 2025
5d41f76
should use the total eff but not only seed
ChunzhengLab Jun 19, 2025
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68 changes: 41 additions & 27 deletions Detectors/Upgrades/ITS3/macros/test/CheckChipResponseFile.C
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@

#define ENABLE_UPGRADES
#include "ITSMFTSimulation/AlpideSimResponse.h"
#include "ITS3Simulation/ChipSimResponse.h"

#include "ITS3Base/SegmentationMosaix.h"
#include "fairlogger/Logger.h"
Expand All @@ -34,61 +35,71 @@ using SegmentationMosaix = o2::its3::SegmentationMosaix;
double um2cm(double um) { return um * 1e-4; }
double cm2um(double cm) { return cm * 1e+4; }

o2::itsmft::AlpideSimResponse *mAlpSimResp0 = nullptr,
*mAlpSimResp1 = nullptr,
*mAptSimResp1 = nullptr;
std::unique_ptr<o2::its3::ChipSimResponse> mAlpSimResp0, mAlpSimResp1, mAptSimResp1;

o2::itsmft::AlpideSimResponse* loadResponse(const std::string& fileName, const std::string& respName)
std::unique_ptr<o2::its3::ChipSimResponse> loadResponse(const std::string& fileName, const std::string& respName)
{
TFile* f = TFile::Open(fileName.data());
if (!f) {
std::cerr << fileName << " not found" << std::endl;
return nullptr;
}
auto resp = (o2::itsmft::AlpideSimResponse*)f->Get(respName.data());
if (!resp)
auto base = f->Get<o2::itsmft::AlpideSimResponse>(respName.c_str());
if (!base) {
std::cerr << respName << " not found in " << fileName << std::endl;
return resp;
return nullptr;
}
return std::make_unique<o2::its3::ChipSimResponse>(base);
}

void LoadRespFunc()
{
std::string AptsFile = "$(O2_ROOT)/share/Detectors/Upgrades/ITS3/data/ITS3ChipResponseData/APTSResponseData.root";
std::string AlpideFile = "$(O2_ROOT)/share/Detectors/ITSMFT/data/AlpideResponseData/AlpideResponseData.root";

std::cout << "=====================\n";
LOGP(info, "ALPIDE Vbb=0V response");
mAlpSimResp0 = loadResponse(AlpideFile, "response0"); // Vbb=0V
LOG(info) << "ALPIDE Vbb=0V response" << std::endl;
mAlpSimResp0->computeCentreFromData();
mAlpSimResp0->print();
LOGP(info, "Response Centre {}", mAlpSimResp0->getRespCentreDep());
std::cout << "=====================\n";
LOGP(info, "ALPIDE Vbb=-3V response");
mAlpSimResp1 = loadResponse(AlpideFile, "response1"); // Vbb=-3V
LOG(info) << "ALPIDE Vbb=-3V response" << std::endl;
mAlpSimResp1->computeCentreFromData();
mAlpSimResp1->print();
LOGP(info, "Response Centre {}", mAlpSimResp1->getRespCentreDep());
std::cout << "=====================\n";
LOGP(info, "APTS response");
mAptSimResp1 = loadResponse(AptsFile, "response1"); // APTS
LOG(info) << "APTS response" << std::endl;
mAptSimResp1->computeCentreFromData();
mAptSimResp1->print();
LOGP(info, "Response Centre {}", mAptSimResp1->getRespCentreDep());
std::cout << "=====================\n";
}

std::vector<float> getCollectionSeediciencies(o2::itsmft::AlpideSimResponse* resp,
std::vector<float> getCollectionSeediciencies(o2::its3::ChipSimResponse* resp,
const std::vector<float>& depths)
{
std::vector<float> seed;
bool flipRow = false, flipCol = false;
for (auto depth : depths) {
auto rspmat = resp->getResponse(0.0, 0.0,
um2cm(depth) + resp->getDepthMin() + 1.e-9,
um2cm(depth) + 1.e-9,
flipRow, flipCol);
seed.push_back(rspmat ? rspmat->getValue(2, 2) : 0.f);
}
return seed;
}

std::vector<float> getShareValues(o2::itsmft::AlpideSimResponse* resp,
std::vector<float> getShareValues(o2::its3::ChipSimResponse* resp,
const std::vector<float>& depths)
{
std::vector<float> share;
bool flipRow = false, flipCol = false;
for (auto depth : depths) {
auto rspmat = resp->getResponse(0.0, 0.0,
um2cm(depth) + resp->getDepthMin() + 1.e-9,
um2cm(depth) + 1.e-9,
flipRow, flipCol);
float s = 0;
int npix = resp->getNPix();
Expand All @@ -103,14 +114,14 @@ std::vector<float> getShareValues(o2::itsmft::AlpideSimResponse* resp,
return share;
}

std::vector<float> getEffValues(o2::itsmft::AlpideSimResponse* resp,
std::vector<float> getEffValues(o2::its3::ChipSimResponse* resp,
const std::vector<float>& depths)
{
std::vector<float> all;
bool flipRow = false, flipCol = false;
for (auto depth : depths) {
auto rspmat = resp->getResponse(0.0, 0.0,
um2cm(depth) + resp->getDepthMin() + 1.e-9,
um2cm(depth) + 1.e-9,
flipRow, flipCol);
float s = 0;
int npix = resp->getNPix();
Expand All @@ -129,13 +140,16 @@ void CheckChipResponseFile()
LoadRespFunc();
LOG(info) << "Response function loaded" << std::endl;

std::vector<float> vecDepth(50);
for (int i = 0; i < 50; ++i)
vecDepth[i] = i;
std::vector<float> vecDepth;
int numPoints = 100;
for (int i = 0; i < numPoints; ++i) {
float value = -50 + i * (100.0f / (numPoints - 1));
vecDepth.push_back(value);
}

int colors[] = {kOrange + 7, kRed + 1, kAzure + 4};
struct RespInfo {
o2::itsmft::AlpideSimResponse* resp;
std::unique_ptr<o2::its3::ChipSimResponse>& resp;
std::string title;
int color;
};
Expand All @@ -145,7 +159,7 @@ void CheckChipResponseFile()
{mAlpSimResp1, "ALPIDE Vbb=-3V", colors[2]}};

TCanvas* c1 = new TCanvas("c1", "c1", 800, 600);
TH1* frame = c1->DrawFrame(-1, -0.049, 50, 1.049);
TH1* frame = c1->DrawFrame(-50, -0.049, 50, 1.049);
frame->SetTitle(";Depth(um);Charge Collection Seed / Share / Eff");
TLegend* leg = new TLegend(0.15, 0.5, 0.4, 0.85);
leg->SetFillStyle(0);
Expand All @@ -154,11 +168,11 @@ void CheckChipResponseFile()
for (auto& r : responses) {
if (!r.resp)
continue;
auto seed = getCollectionSeediciencies(r.resp, vecDepth);
auto shr = getShareValues(r.resp, vecDepth);
auto all = getEffValues(r.resp, vecDepth);
auto seed = getCollectionSeediciencies(r.resp.get(), vecDepth);
auto shr = getShareValues(r.resp.get(), vecDepth);
auto all = getEffValues(r.resp.get(), vecDepth);

TGraph* grSeed = new TGraph(vecDepth.size(), vecDepth.data(), seed.data());
auto grSeed = new TGraph(vecDepth.size(), vecDepth.data(), seed.data());
grSeed->SetTitle(Form("%s seed", r.title.c_str()));
grSeed->SetLineColor(r.color);
grSeed->SetLineWidth(2);
Expand All @@ -168,7 +182,7 @@ void CheckChipResponseFile()
grSeed->Draw("SAME LP");
leg->AddEntry(grSeed, Form("%s seed", r.title.c_str()), "lp");

TGraph* grShare = new TGraph(vecDepth.size(), vecDepth.data(), shr.data());
auto grShare = new TGraph(vecDepth.size(), vecDepth.data(), shr.data());
grShare->SetLineColor(r.color);
grShare->SetLineWidth(2);
grShare->SetMarkerColor(r.color);
Expand All @@ -177,7 +191,7 @@ void CheckChipResponseFile()
grShare->Draw("SAME LP");
leg->AddEntry(grShare, Form("%s share", r.title.c_str()), "p");

TGraph* grEff = new TGraph(vecDepth.size(), vecDepth.data(), all.data());
auto grEff = new TGraph(vecDepth.size(), vecDepth.data(), all.data());
grEff->SetLineColor(r.color);
grEff->SetLineWidth(2);
grEff->SetMarkerColor(r.color);
Expand Down
8 changes: 4 additions & 4 deletions Detectors/Upgrades/ITS3/simulation/src/ChipDigitsContainer.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -31,12 +31,12 @@ void ChipDigitsContainer::addNoise(UInt_t rofMin, UInt_t rofMax, const o2::its3:
int nel = 0;

if (isIB()) {
// Inner barrel: use ITS3-specific noise interface with OB segmentation.
mean = params->getIBNoisePerPixel() * SegmentationOB::NPixels;
// Inner barrel: use ITS3-specific noise interface with IB segmentation.
mean = params->getIBNoisePerPixel() * SegmentationIB::NPixels;
nel = static_cast<int>(params->getIBChargeThreshold() * 1.1);
} else {
// Outer barrel: use base class noise interface with IB segmentation.
mean = params->getNoisePerPixel() * SegmentationIB::NPixels;
// Outer barrel: use base class noise interface with OB segmentation.
mean = params->getNoisePerPixel() * SegmentationOB::NPixels;
nel = static_cast<int>(params->getChargeThreshold() * 1.1);
}

Expand Down
76 changes: 52 additions & 24 deletions Detectors/Upgrades/ITS3/simulation/src/ChipSimResponse.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -25,38 +25,66 @@ void ChipSimResponse::initData(int tableNumber, std::string dataPath, const bool

void ChipSimResponse::computeCentreFromData()
{
std::vector<float> zVec, qVec;
const int npix = o2::itsmft::AlpideRespSimMat::getNPix();
std::vector<float> zVec, effVec;
zVec.reserve(mNBinDpt);
effVec.reserve(mNBinDpt);

for (int iz = 0; iz < mNBinDpt; ++iz) {
size_t bin = iz + mNBinDpt * (0 + mNBinRow * 0);
const auto& mat = mData[bin];
float val = mat.getValue(npix / 2, npix / 2);
float gz = mDptMin + iz / mStepInvDpt;
zVec.push_back(gz);
qVec.push_back(val);
int rev = mNBinDpt - 1 - iz;
float z = mDptMin + iz / mStepInvDpt;
float sum = 0.f;
const auto& mat = mData[rev];
for (int ix = 0; ix < npix; ++ix) {
for (int iy = 0; iy < npix; ++iy) {
sum += mat.getValue(ix, iy);
}
}
zVec.push_back(z);
effVec.push_back(sum);
}

std::vector<std::pair<float, float>> zqPairs;
for (size_t i = 0; i < zVec.size(); ++i) {
zqPairs.emplace_back(zVec[i], qVec[i]);
}
std::sort(zqPairs.begin(), zqPairs.end());
zVec.clear();
qVec.clear();
for (auto& p : zqPairs) {
zVec.push_back(p.first);
qVec.push_back(p.second);
}
struct Bin {
float z0, z1, q0, q1, dq;
};
std::vector<Bin> bins;
bins.reserve(zVec.size() - 1);

float intQ = 0.f, intZQ = 0.f;
float totQ = 0.f;
for (size_t i = 0; i + 1 < zVec.size(); ++i) {
float z0 = zVec[i], z1 = zVec[i + 1];
float q0 = qVec[i], q1 = qVec[i + 1];
float dz = z1 - z0;
intQ += 0.5f * (q0 + q1) * dz;
intZQ += 0.5f * (z0 * q0 + z1 * q1) * dz;
float q0 = effVec[i], q1 = effVec[i + 1];
float dq = 0.5f * (q0 + q1) * (z1 - z0);
bins.push_back({z0, z1, q0, q1, dq});
totQ += dq;
}

if (totQ <= 0.f) {
mRespCentreDep = mDptMin;
return;
}

float halfQ = 0.5f * totQ;
float cumQ = 0.f;
for (auto& b : bins) {
if (cumQ + b.dq < halfQ) {
cumQ += b.dq;
continue;
}
float dz = b.z1 - b.z0;
float slope = (b.q1 - b.q0) / dz;
float disc = b.q0 * b.q0 - 2.f * slope * (cumQ - halfQ);

float x;
if (disc >= 0.f && std::abs(slope) > 1e-6f) {
x = (-b.q0 + std::sqrt(disc)) / slope;
} else {
x = (halfQ - cumQ) / b.q0;
}
x = std::clamp(x, 0.f, dz);
mRespCentreDep = b.z0 + x;
return;
}

mRespCentreDep = (intQ > 0.f) ? intZQ / intQ : 0.f;
mRespCentreDep = mDptMax;
}