/* $Id$ */
//_________________________________________________________________________
-// 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)
+// Implementation version v1 of PHOS Manager class
+//---
+// Layout EMC + PPSD has name GPS2:
+// Produces cumulated hits
+//---
+// Layout EMC + CPV has name IHEP:
+// Produces hits for CPV, cumulated hits
+//---
+// Layout EMC + CPV + PPSD has name GPS:
+// Produces hits for CPV, cumulated hits
+//---
+//*-- Author: Yves Schutz (SUBATECH)
// --- ROOT system ---
+
+#include "TBRIK.h"
+#include "TNode.h"
#include "TRandom.h"
+#include "TTree.h"
+#include "TParticle.h"
// --- Standard library ---
-#include <cstdio>
-#include <cstring>
-#include <cstdlib>
-#include <strstream>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <strstream.h>
// --- AliRoot header files ---
#include "AliPHOSv1.h"
#include "AliPHOSHit.h"
-#include "AliPHOSDigit.h"
+#include "AliPHOSCPVDigit.h"
#include "AliRun.h"
#include "AliConst.h"
+#include "AliMC.h"
+#include "AliPHOSGeometry.h"
+#include "AliPHOSQAIntCheckable.h"
+#include "AliPHOSQAFloatCheckable.h"
+#include "AliPHOSQAMeanChecker.h"
ClassImp(AliPHOSv1)
+//____________________________________________________________________________
+AliPHOSv1::AliPHOSv1():
+AliPHOSv0()
+{
+ // default ctor: initialze data memebers
+ fQAHitsMul = 0 ;
+ fQAHitsMulB = 0 ;
+ fQATotEner = 0 ;
+ fQATotEnerB = 0 ;
+
+ fLightYieldMean = 0. ;
+ fIntrinsicPINEfficiency = 0. ;
+ fLightYieldAttenuation = 0. ;
+ fRecalibrationFactor = 0. ;
+ fElectronsPerGeV = 0. ;
+ fAPDGain = 0. ;
+ fLightFactor = 0. ;
+ fAPDFactor = 0. ;
+
+}
+
//____________________________________________________________________________
AliPHOSv1::AliPHOSv1(const char *name, const char *title):
- AliPHOSv0(name,title)
+ AliPHOSv0(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 ;
+ //
+ // We store hits :
+ // - fHits (the "normal" one), which retains the hits associated with
+ // the current primary particle being tracked
+ // (this array is reset after each primary has been tracked).
+ //
+
+
+
+ // We do not want to save in TreeH the raw hits
+ // But save the cumulated hits instead (need to create the branch myself)
+ // It is put in the Digit Tree because the TreeH is filled after each primary
+ // and the TreeD at the end of the event (branch is set in FinishEvent() ).
+
+ fHits= new TClonesArray("AliPHOSHit",1000) ;
+ gAlice->AddHitList(fHits) ;
+
+ fNhits = 0 ;
+
+ fIshunt = 2 ; // All hits are associated with primary particles
+
+ //Photoelectron statistics:
+ // The light yield is a poissonian distribution of the number of
+ // photons created in the PbWo4 crystal, calculated using following formula
+ // NumberOfPhotons = EnergyLost * LightYieldMean* APDEfficiency *
+ // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit);
+ // LightYieldMean is parameter calculated to be over 47000 photons per GeV
+ // APDEfficiency is 0.02655
+ // k_0 is 0.0045 from Valery Antonenko
+ // The number of electrons created in the APD is
+ // NumberOfElectrons = APDGain * LightYield
+ // The APD Gain is 300
+ fLightYieldMean = 47000;
+ fIntrinsicPINEfficiency = 0.02655 ; //APD= 0.1875/0.1271 * 0.018 (PIN)
+ fLightYieldAttenuation = 0.0045 ;
+ fRecalibrationFactor = 13.418/ fLightYieldMean ;
+ fElectronsPerGeV = 2.77e+8 ;
+ fAPDGain = 300. ;
+ fLightFactor = fLightYieldMean * fIntrinsicPINEfficiency ;
+ fAPDFactor = (fRecalibrationFactor/100.) * fAPDGain ;
+
+
+ Int_t nb = GetGeometry()->GetNModules() ;
+
+ // create checkables
+ fQAHitsMul = new AliPHOSQAIntCheckable("HitsM") ;
+ fQATotEner = new AliPHOSQAFloatCheckable("TotEn") ;
+ fQAHitsMulB = new TClonesArray("AliPHOSQAIntCheckable",nb) ;
+ fQATotEnerB = new TClonesArray("AliPHOSQAFloatCheckable", nb);
+ char tempo[20] ;
+ Int_t i ;
+ for ( i = 0 ; i < nb ; i++ ) {
+ sprintf(tempo, "HitsMB%d", i+1) ;
+ new( (*fQAHitsMulB)[i]) AliPHOSQAIntCheckable(tempo) ;
+ sprintf(tempo, "TotEnB%d", i+1) ;
+ new( (*fQATotEnerB)[i] ) AliPHOSQAFloatCheckable(tempo) ;
+ }
+
+ AliPHOSQAMeanChecker * hmc = new AliPHOSQAMeanChecker("HitsMul", 100. ,25.) ;
+ AliPHOSQAMeanChecker * emc = new AliPHOSQAMeanChecker("TotEner", 10. ,5.) ;
+ AliPHOSQAMeanChecker * bhmc = new AliPHOSQAMeanChecker("HitsMulB", 100. ,5.) ;
+ AliPHOSQAMeanChecker * bemc = new AliPHOSQAMeanChecker("TotEnerB", 2. ,.5) ;
+
+ // associate checkables and checkers
+ fQAHitsMul->AddChecker(hmc) ;
+ fQATotEner->AddChecker(emc) ;
+ for ( i = 0 ; i < nb ; i++ ) {
+ (static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[i]))->AddChecker(bhmc) ;
+ (static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[i]))->AddChecker(bemc) ;
+ }
+
}
//____________________________________________________________________________
-AliPHOSv1::AliPHOSv1(AliPHOSReconstructioner * Reconstructioner, const char *name, const char *title):
- AliPHOSv0(Reconstructioner,name,title)
+AliPHOSv1::~AliPHOSv1()
{
- // 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 ;
+ // dtor
+
+ if ( fHits) {
+ fHits->Delete() ;
+ delete fHits ;
+ fHits = 0 ;
+ }
+ if (fTreeQA)
+ delete fTreeQA ;
}
//____________________________________________________________________________
-void AliPHOSv1::StepManager(void)
+void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t Id, Float_t * hits)
{
- // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell
- // Adds the energy deposited in the PIN diode
-
- Int_t relid[4] ; // (box, layer, row, column) indices
- Float_t xyze[4] ; // position wrt MRS and energy deposited
- TLorentzVector pos ;
- Int_t copy;
- Float_t lightyield ; // Light Yield per GeV
- Float_t nElectrons ; // Number of electrons in the PIN diode
- TString name = fGeom->GetName() ;
- Float_t global[3] ;
- Float_t local[3] ;
- Float_t lostenergy ;
-
- Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
-
- if ( name == "GPS2" ) { // the CPV is a 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
- gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number
- // 1-> Geom->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
-
- Int_t absid ;
- fGeom->RelToAbsNumbering(relid,absid) ;
-
+ // Add a hit to the hit list.
+ // A PHOS hit is the sum of all hits in a single crystal from one primary and within some time gate
+
+ Int_t hitCounter ;
+ AliPHOSHit *newHit ;
+ AliPHOSHit *curHit ;
+ Bool_t deja = kFALSE ;
+ AliPHOSGeometry * geom = GetGeometry() ;
+
+ newHit = new AliPHOSHit(shunt, primary, tracknumber, Id, hits) ;
+
+ for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) {
+ curHit = dynamic_cast<AliPHOSHit*>((*fHits)[hitCounter]) ;
+ if(curHit->GetPrimary() != primary) break ;
+ // We add hits with the same primary, while GEANT treats primaries succesively
+ if( *curHit == *newHit ) {
+ *curHit + *newHit ;
+ deja = kTRUE ;
+ }
+ }
+
+ if ( !deja ) {
+ new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
+ // get the block Id number
+ Int_t relid[4] ;
+ geom->AbsToRelNumbering(Id, relid) ;
+ // and fill the relevant QA checkable (only if in PbW04)
+ if ( relid[1] == 0 ) {
+ fQAHitsMul->Update(1) ;
+ (static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[relid[0]-1]))->Update(1) ;
+ }
+ fNhits++ ;
+ }
+
+ delete newHit;
+}
- AddHit(primary, absid, xyze );
+//____________________________________________________________________________
+void AliPHOSv1::FinishPrimary()
+{
+ // called at the end of each track (primary) by AliRun
+ // hits are reset for each new track
+ // accumulate the total hit-multiplicity
+// if ( fQAHitsMul )
+// fQAHitsMul->Update( fHits->GetEntriesFast() ) ;
- } // there is deposited energy
- } // We are inside the gas of the CPV
- } // GPS2 configuration
+}
+
+//____________________________________________________________________________
+void AliPHOSv1::FinishEvent()
+{
+ // called at the end of each event by AliRun
+ // accumulate the hit-multiplicity and total energy per block
+ // if the values have been updated check it
+
+ if ( fQATotEner ) {
+ if ( fQATotEner->HasChanged() ) {
+ fQATotEner->CheckMe() ;
+ fQATotEner->Reset() ;
+ }
+ }
- 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] ;
- lostenergy = gMC->Edep() ;
- xyze[3] = gMC->Edep() ;
-
- global[0] = pos[0] ;
- global[1] = pos[1] ;
- global[2] = pos[2] ;
-
- if ( xyze[3] != 0 ) {
- gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ;
- relid[1] = 0 ; // means PW04
- gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module
- gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module
+ Int_t i ;
+ if ( fQAHitsMulB && fQATotEnerB ) {
+ for (i = 0 ; i < GetGeometry()->GetNModules() ; i++) {
+ AliPHOSQAIntCheckable * ci = static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[i]) ;
+ AliPHOSQAFloatCheckable* cf = static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[i]) ;
+ if ( ci->HasChanged() ) {
+ ci->CheckMe() ;
+ ci->Reset() ;
+ }
+ if ( cf->HasChanged() ) {
+ cf->CheckMe() ;
+ cf->Reset() ;
+ }
+ }
+ }
+
+ // check the total multiplicity
+
+ if ( fQAHitsMul ) {
+ if ( fQAHitsMul->HasChanged() ) {
+ fQAHitsMul->CheckMe() ;
+ fQAHitsMul->Reset() ;
+ }
+ }
+}
+//____________________________________________________________________________
+void AliPHOSv1::StepManager(void)
+{
+ // Accumulates hits as long as the track stays in a single crystal or CPV gas Cell
- // get the absolute Id number
+ Int_t relid[4] ; // (box, layer, row, column) indices
+ Int_t absid ; // absolute cell ID number
+ Float_t xyzte[5]={-1000.,-1000.,-1000.,0.,0.} ; // position wrt MRS, time 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 = GetGeometry()->GetName() ;
- Int_t absid ;
- fGeom->RelToAbsNumbering(relid,absid) ;
- gMC->Gmtod(global, local, 1) ;
-
- // calculating number of electrons in the PIN diode asociated to this hit
- lightyield = gRandom->Poisson(fLightYieldMean) ;
- nElectrons = lostenergy * lightyield * fIntrinsicPINEfficiency *
- exp(-fLightYieldAttenuation * (local[1]+fGeom->GetCrystalSize(1)/2.0 ) ) ;
-
- xyze[3] = nElectrons * fRecalibrationFactor ;
- // add current hit to the hit list
- AddHit(primary, absid, xyze);
+ Int_t moduleNumber ;
+
+ if( gMC->CurrentVolID(copy) == gMC->VolId("PCPQ") &&
+ (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];
- } // 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] ;
- 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
+ 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
+ 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; idigit<ndigits-1; idigit++) {
+ AliPHOSCPVDigit *cpvDigit1 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(idigit));
+ Float_t x1 = cpvDigit1->GetXpad() ;
+ Float_t z1 = cpvDigit1->GetYpad() ;
+ for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
+ AliPHOSCPVDigit *cpvDigit2 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(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; idigit<ndigits; idigit++) {
+ AliPHOSCPVDigit *cpvDigit = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(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
+ GetGeometry()->RelToAbsNumbering(relid, absid) ;
+
+ // add current digit to the temporary hit list
+
+ xyzte[3] = gMC->TrackTime() ;
+ xyzte[4] = cpvDigit->GetQpad() ; // amplitude in a pad
+ primary = -1; // No need in primary for CPV
+ AddHit(fIshunt, primary, tracknumber, absid, xyzte);
+
+ if (cpvDigit->GetQpad() > 0.02) {
+ xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
+ zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
+ qsum += cpvDigit->GetQpad();
+ }
+ }
+ if (cpvDigits) {
+ cpvDigits->Delete();
+ delete cpvDigits;
+ cpvDigits=0;
+ }
+ }
+
+
+
+ if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
+
+ gMC->TrackPosition(pos) ;
+ xyzte[0] = pos[0] ;
+ xyzte[1] = pos[1] ;
+ xyzte[2] = pos[2] ;
+
+ Float_t global[3], local[3] ;
+ global[0] = pos[0] ;
+ global[1] = pos[1] ;
+ global[2] = pos[2] ;
+ Float_t lostenergy = gMC->Edep();
+
+ //Put in the TreeK particle entering PHOS and all its parents
+ if ( gMC->IsTrackEntering() ){
+ Float_t xyzd[3] ;
+ gMC -> Gmtod (xyzte, xyzd, 1); // transform coordinate from master to daughter system
+ if (xyzd[1] > GetGeometry()->GetCrystalSize(1)/2-0.002 ||
+ xyzd[1] < -GetGeometry()->GetCrystalSize(1)/2+0.002) {
+ TParticle * part = 0 ;
+ Int_t parent = gAlice->CurrentTrack() ;
+ while ( parent != -1 ) {
+ part = gAlice->Particle(parent) ;
+ part->SetBit(kKeepBit);
+ parent = part->GetFirstMother() ;
+ }
+ }
+ }
+ if ( lostenergy != 0 ) { // Track is inside the crystal and deposits some energy
+ xyzte[3] = gMC->TrackTime() ;
+
+ gMC->CurrentVolOffID(10, moduleNumber) ; // get the PHOS module number ;
+
+ Int_t strip ;
+ gMC->CurrentVolOffID(3, strip);
+ Int_t cell ;
+ gMC->CurrentVolOffID(2, cell);
+
+ Int_t row = 1 + GetGeometry()->GetNZ() - strip % GetGeometry()->GetNZ() ;
+ Int_t col = (Int_t) TMath::Ceil((Double_t) strip/GetGeometry()->GetNZ()) -1 ;
+
+ absid = (moduleNumber-1)*GetGeometry()->GetNCristalsInModule() +
+ row + (col*GetGeometry()->GetEMCAGeometry()->GetNCellsInStrip() + cell-1)*GetGeometry()->GetNZ() ;
+
+ gMC->Gmtod(global, local, 1) ;
+
+ //Calculates the light yield, the number of photons produced in the
+ //crystal
+ Float_t lightYield = gRandom->Poisson(fLightFactor * lostenergy *
+ exp(-fLightYieldAttenuation *
+ (local[1]+GetGeometry()->GetCrystalSize(1)/2.0 ))
+ ) ;
+
+ //Calculates de energy deposited in the crystal
+ xyzte[4] = fAPDFactor * lightYield ;
+
+ // add current hit to the hit list
+ //cout << "AliPHOSv1::StepManager " << primary << " " << tracknumber << endl ;
+ AddHit(fIshunt, primary,tracknumber, absid, xyzte);
+
+ // fill the relevant QA Checkables
+ fQATotEner->Update( xyzte[4] ) ; // total energy in PHOS
+ (static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[moduleNumber-1]))->Update( xyzte[4] ) ; // energy in this block
+
+ } // there is deposited energy
+ } // we are inside a PHOS Xtal
+
+}
- Int_t absid ;
- fGeom->RelToAbsNumbering(relid,absid) ;
-
- // calculating number of electrons in the PIN diode asociated to this hit
- nElectrons = lostenergy * fElectronsPerGeV ;
- xyze[3] = nElectrons * fRecalibrationFactor ;
-
- // add current hit to the hit list
- AddHit(primary, 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
+//____________________________________________________________________________
+void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, Int_t moduleNumber, TClonesArray *cpvDigits)
+{
+ // ------------------------------------------------------------------------
+ // Digitize one CPV hit:
+ // On input take exact 4-momentum p and position zxhit of the hit,
+ // find the pad response around this hit and
+ // put the amplitudes in the pads into array digits
+ //
+ // Author: Yuri Kharlov (after Serguei Sadovsky)
+ // 2 October 2000
+ // ------------------------------------------------------------------------
+
+ const Float_t kCelWr = GetGeometry()->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad)
+ const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e-
+ const Float_t kdEdx = 4.0; // Average energy loss in CPV;
+ const Int_t kNgamz = 5; // Ionization size in Z
+ const Int_t kNgamx = 9; // Ionization size in Phi
+ const Float_t kNoise = 0.03; // charge noise in one pad
+
+ Float_t rnor1,rnor2;
+
+ // Just a reminder on axes notation in the CPV module:
+ // axis Z goes along the beam
+ // axis X goes across the beam in the module plane
+ // axis Y is a normal to the module plane showing from the IP
+
+ Float_t hitX = zxhit[0];
+ Float_t hitZ =-zxhit[1];
+ Float_t pX = p.Px();
+ Float_t pZ =-p.Pz();
+ Float_t pNorm = p.Py();
+ Float_t eloss = kdEdx;
+
+// cout << "CPVDigitize: YVK : "<<hitX<<" "<<hitZ<<" | "<<pX<<" "<<pZ<<" "<<pNorm<<endl;
+
+ Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness();
+ Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness();
+ gRandom->Rannor(rnor1,rnor2);
+ eloss *= (1 + kDetR*rnor1) *
+ TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2)));
+ Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2;
+ Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2;
+ Float_t zhit2 = zhit1 + dZY;
+ Float_t xhit2 = xhit1 + dXY;
+
+ Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
+ Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
+
+ Int_t nIter;
+ Float_t zxe[3][5];
+ if (iwht1==iwht2) { // incline 1-wire hit
+ nIter = 2;
+ zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
+ zxe[1][0] = (iwht1 + 0.5) * kCelWr;
+ zxe[2][0] = eloss/2;
+ zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
+ zxe[1][1] = (iwht1 + 0.5) * kCelWr;
+ zxe[2][1] = eloss/2;
+ }
+ else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
+ nIter = 3;
+ Int_t iwht3 = (iwht1 + iwht2) / 2;
+ Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
+ Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
+ Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
+ Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
+ Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
+ Float_t dxw1 = xhit1 - xwr13;
+ Float_t dxw2 = xhit2 - xwr23;
+ Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
+ Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
+ Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
+ zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
+ zxe[1][0] = xwht1;
+ zxe[2][0] = eloss * egm1;
+ zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
+ zxe[1][1] = xwht2;
+ zxe[2][1] = eloss * egm2;
+ zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
+ zxe[1][2] = xwht3;
+ zxe[2][2] = eloss * egm3;
+ }
+ else { // incline 2-wire hit
+ nIter = 2;
+ Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
+ Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
+ Float_t xwr12 = (xwht1 + xwht2) / 2;
+ Float_t dxw1 = xhit1 - xwr12;
+ Float_t dxw2 = xhit2 - xwr12;
+ Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
+ Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
+ zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
+ zxe[1][0] = xwht1;
+ zxe[2][0] = eloss * egm1;
+ zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
+ zxe[1][1] = xwht2;
+ zxe[2][1] = eloss * egm2;
+ }
+
+ // Finite size of ionization region
+
+ Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ();
+ Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi();
+ Int_t nz3 = (kNgamz+1)/2;
+ Int_t nx3 = (kNgamx+1)/2;
+ cpvDigits->Expand(nIter*kNgamx*kNgamz);
+ TClonesArray &ldigits = *(static_cast<TClonesArray *>(cpvDigits));
+
+ for (Int_t iter=0; iter<nIter; iter++) {
+
+ Float_t zhit = zxe[0][iter];
+ Float_t xhit = zxe[1][iter];
+ Float_t qhit = zxe[2][iter];
+ Float_t zcell = zhit / GetGeometry()->GetPadSizeZ();
+ Float_t xcell = xhit / GetGeometry()->GetPadSizePhi();
+ if ( zcell<=0 || xcell<=0 ||
+ zcell>=nCellZ || xcell>=nCellX) return;
+ Int_t izcell = (Int_t) zcell;
+ Int_t ixcell = (Int_t) xcell;
+ Float_t zc = zcell - izcell - 0.5;
+ Float_t xc = xcell - ixcell - 0.5;
+ for (Int_t iz=1; iz<=kNgamz; iz++) {
+ Int_t kzg = izcell + iz - nz3;
+ if (kzg<=0 || kzg>nCellZ) continue;
+ Float_t zg = (Float_t)(iz-nz3) - zc;
+ for (Int_t ix=1; ix<=kNgamx; ix++) {
+ Int_t kxg = ixcell + ix - nx3;
+ if (kxg<=0 || kxg>nCellX) continue;
+ Float_t xg = (Float_t)(ix-nx3) - xc;
+
+ // Now calculate pad response
+ Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
+ qpad += kNoise*rnor2;
+ if (qpad<0) continue;
+
+ // Fill the array with pad response ID and amplitude
+ new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
+ }
+ }
+ }
+}
+
+//____________________________________________________________________________
+Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
+ // ------------------------------------------------------------------------
+ // Calculate the amplitude in one CPV pad using the
+ // cumulative pad response function
+ // Author: Yuri Kharlov (after Serguei Sadovski)
+ // 3 October 2000
+ // ------------------------------------------------------------------------
+
+ Double_t dz = GetGeometry()->GetPadSizeZ() / 2;
+ Double_t dx = GetGeometry()->GetPadSizePhi() / 2;
+ Double_t z = zhit * GetGeometry()->GetPadSizeZ();
+ Double_t x = xhit * GetGeometry()->GetPadSizePhi();
+ Double_t amplitude = qhit *
+ (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
+ CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
+ return (Float_t)amplitude;
+}
+
+//____________________________________________________________________________
+Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
+ // ------------------------------------------------------------------------
+ // Cumulative pad response function
+ // It includes several terms from the CF decomposition in electrostatics
+ // Note: this cumulative function is wrong since omits some terms
+ // but the cell amplitude obtained with it is correct because
+ // these omitting terms cancel
+ // Author: Yuri Kharlov (after Serguei Sadovski)
+ // 3 October 2000
+ // ------------------------------------------------------------------------
+
+ const Double_t kA=1.0;
+ const Double_t kB=0.7;
+
+ Double_t r2 = x*x + y*y;
+ Double_t xy = x*y;
+ Double_t cumulPRF = 0;
+ for (Int_t i=0; i<=4; i++) {
+ Double_t b1 = (2*i + 1) * kB;
+ cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
+ }
+ cumulPRF *= kA/(2*TMath::Pi());
+ return cumulPRF;
}