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TPC: Use CTP as fallback if no IDCs are available #14919

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Merged
shahor02 merged 2 commits into from
Dec 13, 2025
+34 −4
Merged

TPC: Use CTP as fallback if no IDCs are available #14919

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285def7
TPC: Use CTP as fallback if no IDCs are available
matthias-kleiner Dec 12, 2025
52d6a84
Dont update map as only the lumi is updated
matthias-kleiner Dec 12, 2025
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1 change: 1 addition & 0 deletions Detectors/TPC/calibration/include/TPCCalibration/CorrectionMapsLoader.h
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,7 @@ class CorrectionMapsLoader : public o2::gpu::CorrectionMapsHelper
float mInstLumiCTPFactor = 1.0; // multiplicative factor for inst. lumi
int mLumiCTPSource = 0; // 0: main, 1: alternative CTP lumi source
std::unique_ptr<o2::gpu::TPCFastTransform> mCorrMapMShape{nullptr};
bool mIDC2CTPFallbackActive = false; // flag indicating that fallback from IDC to CTP scaling is active
#endif
};

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37 changes: 33 additions & 4 deletions Detectors/TPC/calibration/src/CorrectionMapsLoader.cxx
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Expand Up @@ -53,6 +53,37 @@ void CorrectionMapsLoader::extractCCDBInputs(ProcessingContext& pc)
o2::ctp::LumiInfo lumiObj;
static o2::ctp::LumiInfo lumiPrev;

if (getLumiScaleType() == 2 || mIDC2CTPFallbackActive) {
float tpcScaler = pc.inputs().get<float>("tpcscaler");
// check if tpcScaler is valid and CTP fallback is allowed
if (tpcScaler == -1.f) {
const bool canUseCTPScaling = mCorrMap && mCorrMapRef && mCorrMap->isIDCSet() && mCorrMapRef->isIDCSet() && mCorrMap->isLumiSet() && mCorrMapRef->isLumiSet();
if (canUseCTPScaling) {
LOGP(info, "Invalid TPC scaler value {} received for IDC-based scaling! Using CTP fallback", tpcScaler);
mIDC2CTPFallbackActive = true;
setMeanLumi(mCorrMap->getLumi(), false);
setMeanLumiRef(mCorrMapRef->getLumi());
setLumiScaleType(1);
} else if (mCorrMap) {
// CTP scaling is not possible, dont do any scaling to avoid applying wrong corrections
const float storedIDC = mCorrMap->getIDC();
LOGP(warning, "Invalid TPC scaler value {} received for IDC-based scaling! CTP fallback not possible, using stored IDC of {} from the map to avoid applying wrong corrections", tpcScaler, storedIDC);
setInstLumi(storedIDC);
}
} else {
if (mIDC2CTPFallbackActive) {
// reset back to normal operation
LOGP(info, "Valid TPC scaler value {} received, switching back to IDC-based scaling", tpcScaler);
mIDC2CTPFallbackActive = false;
setMeanLumi(mCorrMap->getIDC(), false);
setMeanLumiRef(mCorrMapRef->getIDC());
setLumiScaleType(2);
}
// correct IDC received
setInstLumi(tpcScaler);
}
}

if (getLumiCTPAvailable() && mInstCTPLumiOverride <= 0.) {
if (pc.inputs().get<gsl::span<char>>("CTPLumi").size() == sizeof(o2::ctp::LumiInfo)) {
lumiPrev = lumiObj = pc.inputs().get<o2::ctp::LumiInfo>("CTPLumi");
Expand All @@ -67,10 +98,7 @@ void CorrectionMapsLoader::extractCCDBInputs(ProcessingContext& pc)
setInstLumi(getInstLumiCTP());
}
}
if (getLumiScaleType() == 2) {
float tpcScaler = pc.inputs().get<float>("tpcscaler");
setInstLumi(tpcScaler);
}

if (getUseMShapeCorrection()) {
LOGP(info, "Setting M-Shape map");
const auto mapMShape = pc.inputs().get<o2::gpu::TPCFastTransform*>("mshape");
Expand Down Expand Up @@ -317,6 +345,7 @@ void CorrectionMapsLoader::copySettings(const CorrectionMapsLoader& src)
mLumiCTPSource = src.mLumiCTPSource;
mLumiScaleMode = src.mLumiScaleMode;
mScaleInverse = src.getScaleInverse();
mIDC2CTPFallbackActive = src.mIDC2CTPFallbackActive;
}

void CorrectionMapsLoader::updateInverse()
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