/************************************************************************** * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * * * * Author: The ALICE Off-line Project. * * Contributors are mentioned in the code where appropriate. * * * * Permission to use, copy, modify and distribute this software and its * * documentation strictly for non-commercial purposes is hereby granted * * without fee, provided that the above copyright notice appears in all * * copies and that both the copyright notice and this permission notice * * appear in the supporting documentation. The authors make no claims * * about the suitability of this software for any purpose. It is * * provided "as is" without express or implied warranty. * **************************************************************************/ /* $Id$ */ //_________________________________________________________________________ // Implementation version v0 of PHOS Manager class // Layout EMC + PPSD has name GPS2 // The main goal of this version of AliPHOS is to calculte the // induced charged in the PIN diode, taking into account light // tracking in the PbWO4 crystal, induced signal in the // PIN due to MIPS particle and electronic noise. // This is done in the StepManager // //*-- Author: Odd Harald Oddland & Gines Martinez (SUBATECH) // --- ROOT system --- #include "TRandom.h" // --- Standard library --- #include #include #include #include // --- AliRoot header files --- #include "AliPHOSv3.h" #include "AliPHOSHit.h" #include "AliPHOSDigit.h" #include "AliRun.h" #include "AliConst.h" #include "AliMC.h" ClassImp(AliPHOSv3) //____________________________________________________________________________ AliPHOSv3::AliPHOSv3(const char *name, const char *title): AliPHOSv1(name,title) { // ctor // Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using // following formula // NumberOfElectrons = EnergyLost * LightYield * PINEfficiency * // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) * // RecalibrationFactor ; // LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko // PINEfficiency is 0.1875 from Odd Harald Odland work // k_0 is 0.0045 from Valery Antonenko fLightYieldMean = 700000. ; fIntrinsicPINEfficiency = 0.1875 ; fLightYieldAttenuation = 0.0045 ; fRecalibrationFactor = 6.2 / fLightYieldMean ; fElectronsPerGeV = 2.77e+8 ; } //____________________________________________________________________________ AliPHOSv3::AliPHOSv3(AliPHOSReconstructioner * Reconstructioner, const char *name, const char *title): AliPHOSv1(Reconstructioner,name,title) { // ctor // Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using // following formula // NumberOfElectrons = EnergyLost * LightYield * PINEfficiency * // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) * // RecalibrationFactor ; // LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko // PINEfficiency is 0.1875 from Odd Harald Odland work // k_0 is 0.0045 from Valery Antonenko fLightYieldMean = 700000.; fIntrinsicPINEfficiency = 0.1875 ; fLightYieldAttenuation = 0.0045 ; fRecalibrationFactor = 6.2 / fLightYieldMean ; fElectronsPerGeV = 2.77e+8 ; } //____________________________________________________________________________ void AliPHOSv3::StepManager(void) { // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell // if (gMC->IsTrackEntering()) // cout << "Track enters the volume " << gMC->CurrentVolName() << endl; // if (gMC->IsTrackExiting()) // cout << "Track leaves the volume " << gMC->CurrentVolName() << endl; Int_t relid[4] ; // (box, layer, row, column) indices Int_t absid ; // absolute cell ID number Float_t xyze[4]={0,0,0,0} ; // position wrt MRS and energy deposited TLorentzVector pos ; // Lorentz vector of the track current position Int_t copy ; Int_t tracknumber = gAlice->CurrentTrack() ; Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() ); TString name = fGeom->GetName() ; if ( name == "GPS2" || name == "MIXT" ) { // ======> CPV is a GPS' PPSD if( gMC->CurrentVolID(copy) == gMC->VolId("GCEL") ) // We are inside a gas cell { gMC->TrackPosition(pos) ; xyze[0] = pos[0] ; xyze[1] = pos[1] ; xyze[2] = pos[2] ; xyze[3] = gMC->Edep() ; if ( xyze[3] != 0) { // there is deposited energy gMC->CurrentVolOffID(5, relid[0]) ; // get the PHOS Module number if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(5),"PHO1") == 0 ){ relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules(); } gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number // 1-> fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() upper // > fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() lower gMC->CurrentVolOffID(1, relid[2]) ; // get the row number of the cell gMC->CurrentVolID(relid[3]) ; // get the column number // get the absolute Id number fGeom->RelToAbsNumbering(relid, absid) ; // add current hit to the hit list AddHit(fIshunt, primary, tracknumber, absid, xyze); } // there is deposited energy } // We are inside the gas of the CPV } // GPS2 configuration if ( name == "IHEP" || name == "MIXT" ) { // ======> CPV is a IHEP's one // Yuri Kharlov, 28 September 2000 if( gMC->CurrentVolID(copy) == gMC->VolId("CPVQ") && gMC->IsTrackEntering() && gMC->TrackCharge() != 0) { gMC -> TrackPosition(pos); Float_t xyzm[3], xyzd[3] ; Int_t i; for (i=0; i<3; i++) xyzm[i] = pos[i]; gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system Float_t xyd[3]={0,0,0} ; //local posiiton of the entering xyd[0] = xyzd[0]; xyd[1] =-xyzd[1]; xyd[2] =-xyzd[2]; // Current momentum of the hit's track in the local ref. system TLorentzVector pmom ; //momentum of the particle initiated hit gMC -> TrackMomentum(pmom); Float_t pm[3], pd[3]; for (i=0; i<3; i++) pm[i] = pmom[i]; gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system pmom[0] = pd[0]; pmom[1] =-pd[1]; pmom[2] =-pd[2]; // Digitize the current CPV hit: // 1. find pad response and Int_t moduleNumber; gMC->CurrentVolOffID(3,moduleNumber); moduleNumber--; TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit CPVDigitize(pmom,xyd,moduleNumber,cpvDigits); Float_t xmean = 0; Float_t zmean = 0; Float_t qsum = 0; Int_t idigit,ndigits; // 2. go through the current digit list and sum digits in pads ndigits = cpvDigits->GetEntriesFast(); for (idigit=0; idigitUncheckedAt(idigit); Float_t x1 = cpvDigit1->GetXpad() ; Float_t z1 = cpvDigit1->GetYpad() ; for (Int_t jdigit=idigit+1; jdigitUncheckedAt(jdigit); Float_t x2 = cpvDigit2->GetXpad() ; Float_t z2 = cpvDigit2->GetYpad() ; if (x1==x2 && z1==z2) { Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ; cpvDigit2->SetQpad(qsum) ; cpvDigits->RemoveAt(idigit) ; } } } cpvDigits->Compress() ; // 3. add digits to temporary hit list fTmpHits ndigits = cpvDigits->GetEntriesFast(); for (idigit=0; idigitUncheckedAt(idigit); relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number relid[1] =-1 ; // means CPV relid[2] = cpvDigit->GetXpad() ; // column number of a pad relid[3] = cpvDigit->GetYpad() ; // row number of a pad // get the absolute Id number fGeom->RelToAbsNumbering(relid, absid) ; // add current digit to the temporary hit list xyze[0] = 0. ; xyze[1] = 0. ; xyze[2] = 0. ; xyze[3] = cpvDigit->GetQpad() ; // amplitude in a pad primary = -1; // No need in primary for CPV AddHit(fIshunt, primary, tracknumber, absid, xyze); if (cpvDigit->GetQpad() > 0.02) { xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5); zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5); qsum += cpvDigit->GetQpad(); } } delete cpvDigits; } } // end of IHEP configuration if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal gMC->TrackPosition(pos) ; xyze[0] = pos[0] ; xyze[1] = pos[1] ; xyze[2] = pos[2] ; xyze[3] = gMC->Edep() ; if ( (xyze[3] != 0) ) { // Track is inside the crystal and deposits some energy gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ; if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(10),"PHO1") == 0 ) relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules(); relid[1] = 0 ; // means PBW04 gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module // get the absolute Id number fGeom->RelToAbsNumbering(relid, absid) ; // add current hit to the hit list AddHit(fIshunt, primary,tracknumber, absid, xyze); } // there is deposited energy } // we are inside a PHOS Xtal if(gMC->CurrentVolID(copy) == gMC->VolId("PPIN") ) // We are inside de PIN diode { gMC->TrackPosition(pos) ; xyze[0] = pos[0] ; xyze[1] = pos[1] ; xyze[2] = pos[2] ; Float_t lostenergy = gMC->Edep() ; xyze[3] = gMC->Edep() ; if ( xyze[3] != 0 ) { gMC->CurrentVolOffID(11, relid[0]) ; // get the PHOS module number ; relid[1] = 0 ; // means PW04 and PIN gMC->CurrentVolOffID(5, relid[2]) ; // get the row number inside the module gMC->CurrentVolOffID(4, relid[3]) ; // get the cell number inside the module // get the absolute Id number Int_t absid ; fGeom->RelToAbsNumbering(relid,absid) ; // calculating number of electrons in the PIN diode asociated to this hit Float_t nElectrons = lostenergy * fElectronsPerGeV ; xyze[3] = nElectrons * fRecalibrationFactor ; // add current hit to the hit list AddHit(fIshunt, primary, tracknumber, absid, xyze); //printf("PIN volume is %d, %d, %d, %d \n",relid[0],relid[1],relid[2],relid[3]); //printf("Lost energy in the PIN is %f \n",lostenergy) ; } // there is deposited energy } // we are inside a PHOS XtalPHOS PIN diode }