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TPC: Make maximum number of electrons per step a configurable #15604

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Merged
sawenzel merged 1 commit into from
Jul 16, 2026
+2 −1
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TPC: Make maximum number of electrons per step a configurable #15604

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1 change: 1 addition & 0 deletions Detectors/TPC/base/include/TPCBase/ParameterGas.h
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Expand Up @@ -41,6 +41,7 @@ struct ParameterGas : public o2::conf::ConfigurableParamHelper<ParameterGas> {
float Pressure = 1013.25f; ///< Pressure [mbar]
float Temperature = 20.0f; ///< Temperature [°C]
float BetheBlochParam[5] = {0.820172e-1f, 9.94795f, 8.97292e-05f, 2.05873f, 1.65272f}; ///< Parametrization of Bethe-Bloch
int MaxElePerStep = 300; ///< maximum number of electron allowed per step, default is 300 ~10keV

O2ParamDef(ParameterGas, "TPCGasParam");
};
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2 changes: 1 addition & 1 deletion Detectors/TPC/simulation/src/Detector.cxx
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Expand Up @@ -226,7 +226,7 @@ Bool_t Detector::ProcessHits(FairVolume* vol)
const double rndm = fMC->GetRandom()->Rndm();
const double eDep = TMath::Power((kMax - kMin) * rndm + kMin, oneOverAlpha_p1);
int nel_step = static_cast<int>(((eDep - eMin) / wIon) + 1);
nel_step = TMath::Min(nel_step, 300); // 300 electrons corresponds to 10 keV
nel_step = TMath::Min(nel_step, gasParam.MaxElePerStep); // 300 electrons corresponds to 10 keV
numberOfElectrons += nel_step;
}

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