From 7b6cc0b522cec4e6686e3d4caea489e912c2e25a Mon Sep 17 00:00:00 2001 From: schutz Date: Wed, 8 Jan 2003 17:32:15 +0000 Subject: [PATCH 1/1] hits in the tower are added; fluctuations are added later in Digits --- EMCAL/AliEMCALv1.cxx | 67 +++++++++++++++++--------------------------- EMCAL/AliEMCALv1.h | 12 ++------ 2 files changed, 28 insertions(+), 51 deletions(-) diff --git a/EMCAL/AliEMCALv1.cxx b/EMCAL/AliEMCALv1.cxx index f90bac4561e..2acced706c4 100644 --- a/EMCAL/AliEMCALv1.cxx +++ b/EMCAL/AliEMCALv1.cxx @@ -62,8 +62,7 @@ ClassImp(AliEMCALv1) //______________________________________________________________________ AliEMCALv1::AliEMCALv1():AliEMCALv0(){ // ctor - fLightYieldMean = 0 ; - fIntrinsicAPDEfficiency = fLightFactor = fLightYieldAttenuation = fAPDFactor = fAPDGain = fRecalibrationFactor = fAPDFactor = 0. ; + } //______________________________________________________________________ @@ -76,30 +75,6 @@ AliEMCALv1::AliEMCALv1(const char *name, const char *title): fNhits = 0; fIshunt = 2; // All hits are associated with particles entering the calorimeter - - //Photoelectron statistics: - // The light yield is a poissonian distribution of the number of - // photons created in a plastic layer, calculated using following formula - // NumberOfPhotons = EnergyLost * LightYieldMean* APDEfficiency * - // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) - // LightYieldMean is parameter calculated to be over 100000 photons per GeV (a guess) - // APDEfficiency is 0.02655 - // fLightYieldAttenuation is 0.0045 a guess - // TO BE FIXED - //***** Need a method in geometry to retrieve the fiber length corresponding to each layer - //***** See the step manager for the light attenuation calculation - // The number of electrons created in the APD is - // NumberOfElectrons = APDGain * LightYield - // The APD Gain is 300 - - fLightYieldMean = 10000000.; // This is a guess - fIntrinsicAPDEfficiency = 0.02655 ; - fLightFactor = fLightYieldMean * fIntrinsicAPDEfficiency ; - fLightYieldAttenuation = 0.0045 ; // an other guess - fAPDGain = 300. ; - fRecalibrationFactor = 13.418/ fLightYieldMean ; - fAPDFactor = (fRecalibrationFactor/100.) * fAPDGain ; - } //______________________________________________________________________ @@ -116,8 +91,8 @@ AliEMCALv1::~AliEMCALv1(){ void AliEMCALv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t iparent, Float_t ienergy, Int_t id, Float_t * hits,Float_t * p){ // Add a hit to the hit list. - // An EMCAL hit is the sum of all hits in a single segment - // originating from the same enterring particle + // An EMCAL hit is the sum of all hits in a tower section (PRE, ECAL, HCAL) + // originating from the same entering particle Int_t hitCounter; AliEMCALHit *newHit; @@ -129,7 +104,8 @@ void AliEMCALv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t ipa curHit = (AliEMCALHit*) (*fHits)[hitCounter]; // We add hits with the same tracknumber, while GEANT treats // primaries succesively - if(curHit->GetPrimary() != primary) break; + if(curHit->GetPrimary() != primary) + break; if( *curHit == *newHit ) { *curHit = *curHit + *newHit; deja = kTRUE; @@ -149,7 +125,6 @@ void AliEMCALv1::StepManager(void){ // crystal or PPSD gas Cell Int_t id[2]; // (layer, phi, Eta) indices - Int_t absid; // position wrt MRS and energy deposited Float_t xyzte[5]={0.,0.,0.,0.,0.};// position wrt MRS, time and energy deposited Float_t pmom[4]={0.,0.,0.,0.}; @@ -188,7 +163,7 @@ void AliEMCALv1::StepManager(void){ Float_t depositedEnergy ; if( (depositedEnergy = gMC->Edep()) > 0.){// Track is inside a scintillator and deposits some energy - + gMC->TrackPosition(pos); xyzte[0] = pos[0]; xyzte[1] = pos[1]; @@ -203,19 +178,29 @@ void AliEMCALv1::StepManager(void){ gMC->CurrentVolOffID(1, id[0]); // get the POLY copy number; gMC->CurrentVolID(id[1]); // get the phi number inside the layer - absid = (id[0]-1)*(geom->GetNPhi()) + id[1]; - //Calculates the light yield, the number of photons produced in the - //plastic layer - // Here we need to know the fiber lebgth to calculate the attenuation - - Float_t lengthOfFiber = 0. ;// should be retrieved from the geometry - - Float_t lightYield = gRandom->Poisson(fLightFactor * depositedEnergy * - exp(-fLightYieldAttenuation * lengthOfFiber)) ; - xyzte[4] = fAPDFactor * lightYield ; + Int_t tower = (id[0]-1) % geom->GetNZ() + 1 + (id[1] - 1) * 96 ; + Int_t layer = static_cast((id[0]-1)/(geom->GetNZ())) + 1 ; + Int_t absid = tower ; + if (layer <= geom->GetNPRLayers() ) + absid += geom->GetNZ() * geom->GetNPhi() ; + else if (layer > geom->GetNECLayers() ) + absid += 2 * geom->GetNZ() * geom->GetNPhi() ; + else { + Int_t nlayers = geom->GetNPRLayers()+ geom->GetNECLayers()+ geom->GetNHCLayers() ; + if (layer > nlayers) + Fatal("StepManager", "Wrong calculation of layer number: layer = %d > %d\n", layer, nlayers) ; + } + + Float_t lightYield = depositedEnergy ; + ; + xyzte[4] = lightYield ; primary = gAlice->GetPrimary(tracknumber); + + if (gDebug == 2) + Info("StepManager", "id0 = %d, id1 = %d, absid = %d tower = %d layer = %d energy = %f\n", id[0], id[1], absid, tower, layer, xyzte[4]) ; + AddHit(fIshunt, primary,tracknumber, iparent, ienergy, absid, xyzte, pmom); } // there is deposited energy } diff --git a/EMCAL/AliEMCALv1.h b/EMCAL/AliEMCALv1.h index 57f1b4d58a5..65e52c8fa8e 100644 --- a/EMCAL/AliEMCALv1.h +++ b/EMCAL/AliEMCALv1.h @@ -45,16 +45,8 @@ public: private: - Float_t fLightYieldMean ; // Mean lightyield in a plastic layer per GeV (Poisson distribution) - Float_t fIntrinsicAPDEfficiency ; // Photo efficiency of the APD diode - Float_t fLightYieldAttenuation ; // Attenuation of the light through the light fiber - Float_t fRecalibrationFactor ; // Recalibration factor - Float_t fAPDGain ; // APD Gain - Float_t fLightFactor ; //! a calculated factor - Float_t fAPDFactor ; //! a calculated factor - - ClassDef(AliEMCALv1,4)//Implementation of EMCAL manager class to produce hits in a Central Calorimeter - + ClassDef(AliEMCALv1,5)//Implementation of EMCAL manager class to produce hits in a Central Calorimeter + }; #endif // AliEMCALV1_H -- 2.39.3