X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=PHOS%2FAliPHOSv1.cxx;h=d4f8de8f63392e4dbc80995843155ec2332d123e;hb=44be0fdeabe7cc324364556c348442ad231ac47a;hp=6b1c6f291caee8f221ee06cdb81507393b398730;hpb=de9ec31b399388ee561c458eaae1c4e22d829ff7;p=u%2Fmrichter%2FAliRoot.git diff --git a/PHOS/AliPHOSv1.cxx b/PHOS/AliPHOSv1.cxx index 6b1c6f291ca..d4f8de8f633 100644 --- a/PHOS/AliPHOSv1.cxx +++ b/PHOS/AliPHOSv1.cxx @@ -15,197 +15,575 @@ /* $Id$ */ +/* History of cvs commits: + * + * $Log$ + */ + //_________________________________________________________________________ -// 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 + CPV has name IHEP: +// Produces hits for CPV, cumulated hits +//--- +//--- +//*-- Author: Yves Schutz (SUBATECH) // --- ROOT system --- -#include "TRandom.h" +#include +#include // --- Standard library --- -#include -#include -#include -#include // --- AliRoot header files --- - -#include "AliPHOSv1.h" +#include "AliPHOSCPVDigit.h" +#include "AliPHOSGeometry.h" #include "AliPHOSHit.h" -#include "AliPHOSDigit.h" +#include "AliPHOSv1.h" #include "AliRun.h" -#include "AliConst.h" +#include "AliMC.h" ClassImp(AliPHOSv1) +//____________________________________________________________________________ +AliPHOSv1::AliPHOSv1(): +AliPHOSv0() +{ + + 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->GetMCApp()->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 ; } //____________________________________________________________________________ -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 ; + } } //____________________________________________________________________________ -void AliPHOSv1::StepManager(void) +void AliPHOSv1::Copy(TObject & base)const { - // 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) ; - + TObject::Copy(base) ; + AliPHOSv0::Copy(base) ; + AliPHOSv1 &phos = static_cast(base); + phos.fLightYieldMean = fLightYieldMean ; + phos.fIntrinsicPINEfficiency = fIntrinsicPINEfficiency ; + phos.fLightYieldAttenuation = fLightYieldAttenuation ; + phos.fRecalibrationFactor = fRecalibrationFactor ; + phos.fElectronsPerGeV = fElectronsPerGeV ; + phos.fAPDGain = fAPDGain ; + phos.fLightFactor = fLightFactor ; + phos.fAPDFactor = fAPDFactor ; +} + +//____________________________________________________________________________ +void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t Id, Float_t * hits) +{ + // 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, Id, hits) ; + + for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) { + curHit = dynamic_cast((*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) ; + + 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 + +} - } // 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(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 + AliDetector::FinishEvent(); +} +//____________________________________________________________________________ +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 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); + TString name = GetGeometry()->GetName() ; + + Int_t moduleNumber ; + + static Int_t idPCPQ = gMC->VolId("PCPQ"); + if( gMC->CurrentVolID(copy) == idPCPQ && + (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 - } // 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 + Float_t xyd[3]={0,0,0} ; //local position of the entering + xyd[0] = xyzd[0]; + xyd[1] =-xyzd[2]; + xyd[2] =-xyzd[1]; + + // 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 + gMC->CurrentVolOffID(3,moduleNumber); + moduleNumber--; + + TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit + CPVDigitize(pmom,xyd,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(cpvDigits->UncheckedAt(idigit)); + Float_t x1 = cpvDigit1->GetXpad() ; + Float_t z1 = cpvDigit1->GetYpad() ; + for (Int_t jdigit=idigit+1; jdigit(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(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 + + Int_t primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() ); + AddHit(fIshunt, primary, 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; + } + } + + + static Int_t idPXTL = gMC->VolId("PXTL"); + if(gMC->CurrentVolID(copy) == idPXTL ) { // 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.+0.1){ //Entered close to forward surface + Int_t parent = gAlice->GetMCApp()->GetCurrentTrackNumber() ; + TParticle * part = gAlice->GetMCApp()->Particle(parent) ; + Float_t vert[3],vertd[3] ; + vert[0]=part->Vx() ; + vert[1]=part->Vy() ; + vert[2]=part->Vz() ; + gMC -> Gmtod (vert, vertd, 1); // transform coordinate from master to daughter system + if(vertd[1]<-GetGeometry()->GetCrystalSize(1)/2.-0.1){ //Particle is created in foront of PHOS + //0.1 to get rid of numerical errors + part->SetBit(kKeepBit); + while ( parent != -1 ) { + part = gAlice->GetMCApp()->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 ; + + Int_t primary ; + if(fIshunt == 2){ + primary = gAlice->GetMCApp()->GetCurrentTrackNumber() ; + TParticle * part = gAlice->GetMCApp()->Particle(primary) ; + while ( !part->TestBit(kKeepBit) ) { + primary = part->GetFirstMother() ; + if(primary == -1){ + primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() ); + break ; //there is a possibility that particle passed e.g. thermal isulator and hits a side + //surface of the crystal. In this case it may have no primary at all. + //We can not easily separate this case from the case when this is part of the shower, + //developed in the neighboring crystal. + } + part = gAlice->GetMCApp()->Particle(primary) ; + } + } + else + primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() ); + + + + // add current hit to the hit list + // Info("StepManager","%d %d", primary, tracknumber) ; + AddHit(fIshunt, primary, absid, xyzte); + + } // there is deposited energy + } // we are inside a PHOS Xtal + +} + +//____________________________________________________________________________ +void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, 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; + +//Info("CPVDigitize", "YVK : %f %f | %f %f %d", hitX, hitZ, pX, pZ, pNorm) ; + + 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(cpvDigits)); + + for (Int_t iter=0; iterGetPadSizeZ(); + 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); + } + } + } +} - 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 +//____________________________________________________________________________ +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; }