X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=ITS%2FAliITSsimulationSSD.cxx;h=13eed8b6c93e44dbb39c3d54fcf98f90772674b5;hb=9702957b95682e02f95f1540be8649a7d3dd9482;hp=e9b8e34f61d12923afe4f9ec5137beca3359366d;hpb=fcf95fc7a1a40644de272f60ebe2a9059a8ba9a7;p=u%2Fmrichter%2FAliRoot.git diff --git a/ITS/AliITSsimulationSSD.cxx b/ITS/AliITSsimulationSSD.cxx index e9b8e34f61d..13eed8b6c93 100644 --- a/ITS/AliITSsimulationSSD.cxx +++ b/ITS/AliITSsimulationSSD.cxx @@ -19,37 +19,48 @@ #include #include #include +#include + +#include #include "AliITSmodule.h" #include "AliITSMapA2.h" #include "AliITSpList.h" #include "AliITSCalibrationSSD.h" #include "AliITSsegmentationSSD.h" -#include "AliITSdcsSSD.h" +//#include "AliITSdcsSSD.h" #include "AliITS.h" #include "AliITShit.h" #include "AliITSdigitSSD.h" #include "AliRun.h" +#include "AliMagF.h" #include "AliITSgeom.h" #include "AliITSsimulationSSD.h" #include "AliITSTableSSD.h" -#include "AliITSresponseSSD.h" +#include +#include "AliMathBase.h" ClassImp(AliITSsimulationSSD) //////////////////////////////////////////////////////////////////////// -// Version: 0 // -// Written by Enrico Fragiacomo // -// July 2000 // // // -// AliITSsimulationSSD is the simulation of SSDs. // +// Author: Enrico Fragiacomo // +// enrico.fragiacomo@ts.infn.it // +// Last revised: june 2008 // +// // +// AliITSsimulationSSD is the simulation of SSD. // //////////////////////////////////////////////////////////////////////// //---------------------------------------------------------------------- AliITSsimulationSSD::AliITSsimulationSSD():AliITSsimulation(), -fDCS(0), + //fDCS(0), fMapA2(0), fIonE(0.0), fDifConst(), -fDriftVel(){ +fDriftVel(), +fTimeResponse(NULL), +fLorentz(kFALSE), +fTanLorAngP(0), +fTanLorAngN(0) +{ //default Constructor //Inputs: // none. @@ -61,44 +72,70 @@ fDriftVel(){ //---------------------------------------------------------------------- AliITSsimulationSSD::AliITSsimulationSSD(AliITSDetTypeSim* dettyp): AliITSsimulation(dettyp), -fDCS(0), +//fDCS(0), fMapA2(0), fIonE(0.0), fDifConst(), -fDriftVel(){ +fDriftVel(), +fTimeResponse(NULL), +fLorentz(kFALSE), +fTanLorAngP(0), +fTanLorAngN(0) +{ // Constructor // Input: - // AliITSsegmentationSSD *seg Pointer to the SSD segmentation to be used - // AliITSCalibrationSSD *resp Pointer to the SSD responce class to be used + // AliITSDetTypeSim Pointer to the SSD dettype to be used // Outputs: // none. // Return // A standard constructed AliITSsimulationSSD class + fTimeResponse = new TF1("ftimeresponse",".5*x*exp(1.-.5*x)"); Init(); } //---------------------------------------------------------------------- void AliITSsimulationSSD::Init(){ - // Inilizer, Inilizes all of the variable as needed in a standard place. - // Input: - // AliITSsegmentationSSD *seg Pointer to the SSD segmentation to be used - // AliITSCalibrationSSD *resp Pointer to the SSD responce class to be used - // Outputs: - // none. - // Return - // none. - AliITSCalibrationSSD* res =(AliITSCalibrationSSD*)GetCalibrationModel(fDetType->GetITSgeom()->GetStartSSD()); + // Inilizer, Inilizes all of the variable as needed in a standard place. + // Input: + // AliITSsegmentationSSD *seg Pointer to the SSD segmentation to be used + // AliITSCalibrationSSD *resp Pointer to the SSD responce class to be used + // Outputs: + // none. + // Return + // none. AliITSsegmentationSSD* seg = (AliITSsegmentationSSD*)GetSegmentationModel(2); - Double_t noise[2] = {0.,0.}; - res->GetNoiseParam(noise[0],noise[1]); // retrieves noise parameters - fDCS = new AliITSdcsSSD(seg,res); - - SetDriftVelocity(); // use default values in .h file - SetIonizeE(); // use default values in .h file - SetDiffConst(); // use default values in .h file - fpList = new AliITSpList(2,GetNStrips()); - fMapA2 = new AliITSMapA2(seg); + AliITSSimuParam* simpar = fDetType->GetSimuParam(); + + SetDriftVelocity(); // use default values in .h file + SetIonizeE(); // use default values in .h file + SetDiffConst(); // use default values in .h file + fpList = new AliITSpList(2,GetNStrips()); + fMapA2 = new AliITSMapA2(seg); + SetLorentzDrift(simpar->GetSSDLorentzDrift()); + if (fLorentz) SetTanLorAngle(); +} + +//______________________________________________________________________ +Bool_t AliITSsimulationSSD::SetTanLorAngle() { + // This function set the Tangent of the Lorentz angles. + // output: Bool_t : kTRUE in case of success + // + + if(!fDetType) { + AliError("AliITSsimulationSPD::SetTanLorAngle: AliITSDetTypeSim* fDetType not set "); + return kFALSE;} + + AliITSSimuParam* simpar = fDetType->GetSimuParam(); + AliMagF* fld = (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); + if (!fld) AliFatal("The field is not initialized"); + Double_t bz = fld->SolenoidField(); + + fTanLorAngN = TMath::Tan( simpar->LorentzAngleElectron(bz) ); + fTanLorAngP = TMath::Tan( simpar->LorentzAngleHole(bz) ); + + return kTRUE; } + //______________________________________________________________________ AliITSsimulationSSD& AliITSsimulationSSD::operator=( const AliITSsimulationSSD &s){ @@ -106,15 +143,20 @@ AliITSsimulationSSD& AliITSsimulationSSD::operator=( if(this==&s) return *this; - this->fDCS = new AliITSdcsSSD(*(s.fDCS)); + // this->fDCS = new AliITSdcsSSD(*(s.fDCS)); this->fMapA2 = s.fMapA2; this->fIonE = s.fIonE; this->fDifConst[0] = s.fDifConst[0]; this->fDifConst[1] = s.fDifConst[1]; this->fDriftVel[0] = s.fDriftVel[0]; this->fDriftVel[1] = s.fDriftVel[1]; + this->fTimeResponse = s.fTimeResponse; + this->fLorentz = s.fLorentz; + this->fTanLorAngP = s.fTanLorAngP; + this->fTanLorAngN = s.fTanLorAngN; return *this; } +/* //______________________________________________________________________ AliITSsimulation& AliITSsimulationSSD::operator=( const AliITSsimulation &s){ @@ -126,18 +168,31 @@ AliITSsimulation& AliITSsimulationSSD::operator=( return *this; } +*/ //______________________________________________________________________ AliITSsimulationSSD::AliITSsimulationSSD(const AliITSsimulationSSD &source): - AliITSsimulation(source){ + AliITSsimulation(source), +fMapA2(source.fMapA2), +fIonE(source.fIonE), +fDifConst(), +fDriftVel(), +fTimeResponse(source.fTimeResponse), +fLorentz(source.fLorentz), +fTanLorAngP(source.fTanLorAngP), +fTanLorAngN(source.fTanLorAngN) +{ // copy constructor - - *this = source; + fDifConst[0] = source.fDifConst[0]; + fDifConst[1] = source.fDifConst[1]; + fDriftVel[0] = source.fDriftVel[0]; + fDriftVel[1] = source.fDriftVel[1]; } //______________________________________________________________________ AliITSsimulationSSD::~AliITSsimulationSSD() { // destructor delete fMapA2; - delete fDCS; + delete fTimeResponse; + //delete fDCS; } //______________________________________________________________________ void AliITSsimulationSSD::InitSimulationModule(Int_t module,Int_t event){ @@ -165,19 +220,19 @@ void AliITSsimulationSSD::FinishSDigitiseModule(){ // Return: // none. - FillMapFrompList(fpList); // need to check if needed here or not???? - SDigitToDigit(fModule,fpList); - fpList->ClearMap(); - fMapA2->ClearMap(); + FillMapFrompList(fpList); // need to check if needed here or not???? + SDigitToDigit(fModule,fpList); + fpList->ClearMap(); + fMapA2->ClearMap(); } //______________________________________________________________________ void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod,Int_t,Int_t) { // Digitizes hits for one SSD module SetModuleNumber(mod->GetIndex()); - + HitsToAnalogDigits(mod,fpList); SDigitToDigit(GetModuleNumber(),fpList); - + fpList->ClearMap(); fMapA2->ClearMap(); } @@ -188,17 +243,18 @@ void AliITSsimulationSSD::SDigitiseModule(AliITSmodule *mod,Int_t,Int_t) { HitsToAnalogDigits(mod,fpList); WriteSDigits(fpList); - + fpList->ClearMap(); fMapA2->ClearMap(); } //______________________________________________________________________ void AliITSsimulationSSD::SDigitToDigit(Int_t module,AliITSpList *pList){ // Takes the pList and finishes the digitization. - + ApplyNoise(pList,module); ApplyCoupling(pList,module); - + ApplyDeadChannels(module); + ChargeToSignal(module,pList); } //______________________________________________________________________ @@ -206,185 +262,324 @@ void AliITSsimulationSSD::HitsToAnalogDigits(AliITSmodule *mod, AliITSpList *pList){ // Loops over all hits to produce Analog/floating point digits. This // is also the first task in producing standard digits. - Int_t lasttrack = -2; - Int_t idtrack = -2; - Double_t x0=0.0, y0=0.0, z0=0.0; - Double_t x1=0.0, y1=0.0, z1=0.0; - Double_t de=0.0; - Int_t module = mod->GetIndex(); - - AliITSsegmentationSSD* seg = (AliITSsegmentationSSD*)GetSegmentationModel(2); - - TObjArray *hits = mod->GetHits(); - Int_t nhits = hits->GetEntriesFast(); - if (nhits<=0) return; - AliITSTableSSD * tav = new AliITSTableSSD(GetNStrips()); - module = mod->GetIndex(); - if ( mod->GetLayer() == 6 ) seg->SetLayer(6); - if ( mod->GetLayer() == 5 ) seg->SetLayer(5); - for(Int_t i=0; iGetHit(i)->GetXL() << " "<GetHit(i)->GetYL(); - cout << " " << mod->GetHit(i)->GetZL(); - cout << endl; - } // end if - if (mod->LineSegmentL(i, x0, x1, y0, y1, z0, z1, de, idtrack)) { - HitToDigit(module, x0, y0, z0, x1, y1, z1, de,tav); - if (lasttrack != idtrack || i==(nhits-1)) { - GetList(idtrack,i,module,pList,tav); - } // end if - lasttrack=idtrack; - } // end if - } // end loop over hits - delete tav; tav=0; - return; + Int_t lasttrack = -2; + Int_t idtrack = -2; + Double_t x0=0.0, y0=0.0, z0=0.0; + Double_t x1=0.0, y1=0.0, z1=0.0; + Double_t de=0.0; + Int_t module = mod->GetIndex(); + Double_t tof = 0.; + + + AliITSsegmentationSSD* seg = (AliITSsegmentationSSD*)GetSegmentationModel(2); + + TObjArray *hits = mod->GetHits(); + Int_t nhits = hits->GetEntriesFast(); + if (nhits<=0) return; + AliITSTableSSD * tav = new AliITSTableSSD(GetNStrips()); + module = mod->GetIndex(); + if ( mod->GetLayer() == 6 ) seg->SetLayer(6); + if ( mod->GetLayer() == 5 ) seg->SetLayer(5); + + for(Int_t i=0; iGetHit(i)->GetXL() << " "<GetHit(i)->GetYL(); + cout << " " << mod->GetHit(i)->GetZL(); + cout << endl; + } // end if + if (mod->LineSegmentL(i, x0, x1, y0, y1, z0, z1, de, idtrack)) { + + // Scale down dE/dx according to the hit's TOF wrt to the trigger + // Necessary for pileup simulation + // EF - 21/04/09 + tof = mod->GetHit(i)->GetTOF(); + tof *= 1.E+6; // convert time in microsecond + if(tof<2.) de = de * fTimeResponse->Eval(-1.*tof+2.); + else de = 0.; + // + + HitToDigit(module, x0, y0, z0, x1, y1, z1, de,tav); + if (lasttrack != idtrack || i==(nhits-1)) { + GetList(idtrack,i,module,pList,tav); + } // end if + lasttrack=idtrack; + } // end if + } // end loop over hits + delete tav; tav=0; + return; } //---------------------------------------------------------------------- void AliITSsimulationSSD::HitToDigit(Int_t module, Double_t x0, Double_t y0, Double_t z0, Double_t x1, Double_t y1, Double_t z1, Double_t de, AliITSTableSSD *tav) { - + // hit to digit conversion - + AliITSsegmentationSSD* seg = (AliITSsegmentationSSD*)GetSegmentationModel(2); - // Turns hits in SSD module into one or more digits. - Float_t tang[2] = {0.0,0.0}; - seg->Angles(tang[0], tang[1]);//stereo<<->tan(stereo)~=stereo - Double_t x, y, z; - Double_t dex=0.0, dey=0.0, dez=0.0; - Double_t pairs; // pair generation energy per step. - Double_t sigma[2] = {0.,0.};// standard deviation of the diffusion gaussian - Double_t tdrift[2] = {0.,0.}; // time of drift - Double_t w; - Double_t inf[2], sup[2], par0[2]; - - // Steps in the module are determined "manually" (i.e. No Geant) - // NumOfSteps divide path between entering and exiting hits in steps - Int_t numOfSteps = NumOfSteps(x1, y1, z1, dex, dey, dez); - // Enery loss is equally distributed among steps - de = de/numOfSteps; - pairs = de/GetIonizeE(); // e-h pairs generated - for(Int_t j=0; j (seg->Dy()/2+10)*1.0E-4 ) { - // check if particle is within the detector - Warning("HitToDigit", - "hit out of detector y0=%e,y=%e,dey=%e,j =%e module=%d", - y0,y,dey,j,module); - return; - } // end if - z = z0 + (j+0.5)*dez; - if(GetDebug(4)) cout <<"HitToDigit "<Dy()*1.0E-4)/2)/GetDriftVelocity(0); - tdrift[1] = ((seg->Dy()*1.0E-4)/2-y)/GetDriftVelocity(1); - - for(Int_t k=0; k<2; k++) { // both sides remember: 0=Pside 1=Nside - - tang[k]=TMath::Tan(tang[k]); - - // w is the coord. perpendicular to the strips - /* - if(k==0) { - w = (x+(GetSegmentation()->Dx()*1.0E-4)/2) - - (z+(GetSegmentation()->Dz()*1.0E-4)/2)*tang[k]; - }else{ - w = (x+(GetSegmentation()->Dx()*1.0E-4)/2) + - (z-(GetSegmentation()->Dz()*1.0E-4)/2)*tang[k]; - } // end if - w /= (GetStripPitch()*1.0E-4); //w is converted in units of pitch - */ - { // replacement block for the above. - Float_t xp=x*1.e+4,zp=z*1.e+4; // microns - seg->GetPadTxz(xp,zp); - if(k==0) w = xp; // P side strip number - else w = zp; // N side strip number - } // end test block - - if((w<(-0.5)) || (w>(GetNStrips()-0.5))) { - // this check rejects hits in regions not covered by strips - // 0.5 takes into account boundaries - if(GetDebug(4)) cout << "x,z="<Angles(tang[0], tang[1]);//stereo<<->tan(stereo)~=stereo + Double_t x, y, z; + Double_t dex=0.0, dey=0.0, dez=0.0; + Double_t pairs; // pair generation energy per step. + Double_t sigma[2] = {0.,0.};// standard deviation of the diffusion gaussian + Double_t tdrift[2] = {0.,0.}; // time of drift + Double_t w; + Double_t inf[2], sup[2], par0[2]; + + // Set up corrections for Lorentz drift (ExB) + Double_t TanLorAngP = fTanLorAngP; + Double_t TanLorAngN = fTanLorAngN; + if(seg->GetLayer()==6) { + TanLorAngP = -1.*fTanLorAngP; + TanLorAngN = -1.*fTanLorAngN; + } + + // Steps in the module are determined "manually" (i.e. No Geant) + // NumOfSteps divide path between entering and exiting hits in steps + Int_t numOfSteps = NumOfSteps(x1, y1, z1, dex, dey, dez); + // Enery loss is equally distributed among steps + de = de/numOfSteps; + pairs = de/GetIonizeE(); // e-h pairs generated + + //----------------------------------------------------- + // stepping + //----------------------------------------------------- + for(Int_t j=0; j (seg->Dy()/2+10)*1.0E-4 ) { + // check if particle is within the detector + Warning("HitToDigit", + "hit out of detector y0=%e,y=%e,dey=%e,j =%d module=%d, exceed=%e", + y0,y,dey,j,module, y-(seg->Dy()/2+10)*1.0E-4); + return; + } // end if + z = z0 + (j+0.5)*dez; + + if(GetDebug(4)) cout <<"HitToDigit "<GetLayer()==6) { + y=-y; // Lay6 module has sensor up-side-down!!! + } + + Int_t k; + //--------------------------------------------------------- + // Pside + //------------------------------------------------------------ + k=0; + + // w is the coord. perpendicular to the strips + // Float_t xp=x*1.e+4,zp=z*1.e+4; // microns + Float_t xp=x,zp=z; + + // correction for the Lorentz's angle + if(fLorentz) { + Float_t deltaxp = (y+(seg->Dy()*1.0E-4)/2)*TanLorAngP; + xp+=deltaxp; + } + + seg->GetPadTxz(xp,zp); + + // calculate drift time + // y is the minimum path + tdrift[0] = (y+(seg->Dy()*1.0E-4)/2)/GetDriftVelocity(0); + + w = xp; // P side strip number + + if((w<(-0.5)) || (w>(GetNStrips()-0.5))) { + // this check rejects hits in regions not covered by strips + // 0.5 takes into account boundaries + if(GetDebug(4)) cout << "Dead SSD region, x,z="<Dy()*1.0E-4)/2-y)*TanLorAngN; + xp+=deltaxn; + } + + + seg->GetPadTxz(xp,zp); + + tdrift[1] = ((seg->Dy()*1.0E-4)/2-y)/GetDriftVelocity(1); + + //tang[k]=TMath::Tan(tang[k]); + + w = zp; // N side strip number + + if((w<(-0.5)) || (w>(GetNStrips()-0.5))) { + // this check rejects hits in regions not covered by strips + // 0.5 takes into account boundaries + if(GetDebug(4)) cout << "Dead SSD region, x,z="<GetNoiseParam(a,b); // retrieves noise parameters - noiseP[0] = a; noiseP[1] = b; - for(k=0;k<2;k++){ // both sides (0=Pside, 1=Nside) - for(ix=0;ixGaus(0,noiseP[k]);// get noise to signal - signal = noise + fMapA2->GetSignal(k,ix);//get signal from map - if(signal<0.) signal=0.0; // in case noise is negative... - fMapA2->SetHit(k,ix,signal); // give back signal to map - if(signal>0.0) pList->AddNoise(k,ix,module,noise); - } // loop over strip - } // loop over k (P or N side) + // Apply Noise. + Int_t ix; + Double_t signal,noise; + AliITSCalibrationSSD* res =(AliITSCalibrationSSD*)GetCalibrationModel(module); + + // Pside + for(ix=0;ixGaus(0,res->GetNoiseP(ix)); + + // need to calibrate noise + // NOTE. noise from the calibration database comes uncalibrated, + // it needs to be calibrated in order to be added + // to the signal. It will be decalibrated later on together with the noise + noise *= (Double_t) res->GetGainP(ix); + + // noise comes in ADC channels from the calibration database + // It needs to be converted back to electronVolts + noise /= res->GetSSDDEvToADC(1.); + + // Finally, noise is added to the signal + signal = noise + fMapA2->GetSignal(0,ix);//get signal from map + fMapA2->SetHit(0,ix,signal); // give back signal to map + if(signal>0.0) pList->AddNoise(0,ix,module,noise); + } // loop over strip + + // Nside + for(ix=0;ixGaus(0,res->GetNoiseN(ix));// give noise to signal + noise *= (Double_t) res->GetGainN(ix); + noise /= res->GetSSDDEvToADC(1.); + signal = noise + fMapA2->GetSignal(1,ix);//get signal from map + fMapA2->SetHit(1,ix,signal); // give back signal to map + if(signal>0.0) pList->AddNoise(1,ix,module,noise); + } // loop over strip + } //______________________________________________________________________ void AliITSsimulationSSD::ApplyCoupling(AliITSpList *pList,Int_t module) { - // Apply the effect of electronic coupling between channels - Int_t ix; - Double_t signalLeft=0, signalRight=0,signal=0; - - for(ix=0;ix0.)signalLeft = fMapA2->GetSignal(0,ix-1)*fDCS->GetCouplingPL(); - else signalLeft = 0.0; - if(ix<(GetNStrips()-1)) signalRight = fMapA2->GetSignal(0,ix+1)* - fDCS->GetCouplingPR(); - else signalRight = 0.0; - signal = signalLeft + signalRight; - fMapA2->AddSignal(0,ix,signal); - if(signal>0.0) pList->AddNoise(0,ix,module,signal); - - signalLeft = signalRight = signal = 0.0; - // N side coupling - if(ix>0.) signalLeft = fMapA2->GetSignal(1,ix-1)*fDCS->GetCouplingNL(); - else signalLeft = 0.0; - if(ix<(GetNStrips()-1)) signalRight = fMapA2->GetSignal(1,ix+1)* - fDCS->GetCouplingNR(); - else signalRight = 0.0; - signal = signalLeft + signalRight; - fMapA2->AddSignal(1,ix,signal); - if(signal>0.0) pList->AddNoise(1,ix,module,signal); - } // loop over strips + // Apply the effect of electronic coupling between channels + Int_t ix; + Double_t signal=0; + //AliITSCalibrationSSD* res =(AliITSCalibrationSSD*)GetCalibrationModel(module); + AliITSSimuParam* res = fDetType->GetSimuParam(); + + Double_t *contrLeft = new Double_t[GetNStrips()]; + Double_t *contrRight = new Double_t[GetNStrips()]; + + // P side coupling + for(ix=0;ix0) contrLeft[ix] = fMapA2->GetSignal(0,ix-1)*res->GetSSDCouplingPL(); + else contrLeft[ix] = 0.0; + if(ix<(GetNStrips()-1)) contrRight[ix] = fMapA2->GetSignal(0,ix+1)*res->GetSSDCouplingPR(); + else contrRight[ix] = 0.0; + } // loop over strips + + for(ix=0;ixGetSSDCouplingPL() * fMapA2->GetSignal(0,ix) + - res->GetSSDCouplingPR() * fMapA2->GetSignal(0,ix); + fMapA2->AddSignal(0,ix,signal); + if(signal>0.0) pList->AddNoise(0,ix,module,signal); + } // loop over strips + + // N side coupling + for(ix=0;ix0) contrLeft[ix] = fMapA2->GetSignal(1,ix-1)*res->GetSSDCouplingNL(); + else contrLeft[ix] = 0.0; + if(ix<(GetNStrips()-1)) contrRight[ix] = fMapA2->GetSignal(1,ix+1)*res->GetSSDCouplingNR(); + else contrRight[ix] = 0.0; + } // loop over strips + + for(ix=0;ixGetSSDCouplingNL() * fMapA2->GetSignal(0,ix) + - res->GetSSDCouplingNR() * fMapA2->GetSignal(0,ix); + fMapA2->AddSignal(1,ix,signal); + if(signal>0.0) pList->AddNoise(1,ix,module,signal); + } // loop over strips + + + delete [] contrLeft; + delete [] contrRight; +} + +//______________________________________________________________________ +void AliITSsimulationSSD::ApplyDeadChannels(Int_t module) { + // Kill dead channels setting gain to zero + + AliITSCalibrationSSD* res = (AliITSCalibrationSSD*)GetCalibrationModel(module); + + for(Int_t i=0;iIsPChannelBad(i)) res->SetGainP(i,0.0); + if(res->IsNChannelBad(i)) res->SetGainN(i,0.0); + + } // loop over strips + } + //______________________________________________________________________ Float_t AliITSsimulationSSD::F(Float_t av, Float_t x, Float_t s) { // Computes the integral of a gaussian using Error Function @@ -392,7 +587,7 @@ Float_t AliITSsimulationSSD::F(Float_t av, Float_t x, Float_t s) { Float_t sigm2 = sqrt2*s; Float_t integral; - integral = 0.5 * TMath::Erf( (x - av) / sigm2); + integral = 0.5 * AliMathBase::ErfFast( (x - av) / sigm2); return integral; } //______________________________________________________________________ @@ -485,6 +680,7 @@ Int_t AliITSsimulationSSD::NumOfSteps(Double_t x, Double_t y, Double_t z, Int_t numOfSteps = (Int_t) (TMath::Sqrt(x*x+y*y+z*z)/step); if (numOfSteps < 1) numOfSteps = 1; // one step, at least + //numOfSteps=1; // we could condition the stepping depending on the incident angle // of the track @@ -521,7 +717,7 @@ void AliITSsimulationSSD::GetList(Int_t label,Int_t hit,Int_t mod, tav->Clear(); } //---------------------------------------------------------------------- -void AliITSsimulationSSD::ChargeToSignal(Int_t module,AliITSpList *pList) { +void AliITSsimulationSSD::ChargeToSignal(Int_t module,const AliITSpList *pList) { // charge to signal static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); Float_t threshold = 0.; @@ -532,37 +728,51 @@ void AliITSsimulationSSD::ChargeToSignal(Int_t module,AliITSpList *pList) { Int_t j1; Float_t charges[3] = {0.0,0.0,0.0}; Float_t signal; - Double_t noise[2] = {0.,0.}; AliITSCalibrationSSD* res =(AliITSCalibrationSSD*)GetCalibrationModel(module); - res->GetNoiseParam(noise[0],noise[1]); + AliITSSimuParam* simpar = fDetType->GetSimuParam(); for(Int_t k=0;k<2;k++){ // both sides (0=Pside, 1=Nside) - // Threshold for zero-suppression - // It can be defined in AliITSCalibrationSSD - // threshold = (Float_t)GetResp()->MinVal(k); - // I prefer to think adjusting the threshold "manually", looking - // at the scope, and considering noise standard deviation - threshold = 4.0*noise[k]; // 4 times noise is a choice - for(Int_t ix=0;ixGetSignal(k,ix) <= threshold)continue; - // convert to ADC signal - signal = res->GetDEvToADC( - fMapA2->GetSignal(k,ix)); - if(signal>1024.) signal = 1024.;//if exceeding, accumulate last one - digits[0] = k; - digits[1] = ix; - digits[2] = (Int_t) signal; - for(j1=0;j1GetNEnteries()){ - // only three in digit. - tracks[j1] = pList->GetTrack(k,ix,j1); - hits[j1] = pList->GetHit(k,ix,j1); - }else{ - tracks[j1] = -3; - hits[j1] = -1; - } // end for j1 - // finally add digit - aliITS->AddSimDigit(2,0,digits,tracks,hits,charges); - } // end for ix + for(Int_t ix=0;ix gain=0 + if( ((k==0)&&(res->GetGainP(ix)==0)) || ((k==1)&&(res->GetGainN(ix)==0))) continue; + + signal = fMapA2->GetSignal(k,ix); + // signal has to be uncalibrated + // In real life, gains are supposed to be calculated from calibration runs, + // stored in the calibration DB and used in the reconstruction + // (see AliITSClusterFinderSSD.cxx) + if(k==0) signal /= res->GetGainP(ix); + else signal /= res->GetGainN(ix); + + // signal is converted in unit of ADC + signal = res->GetSSDDEvToADC(signal); + if(signal>4095.) signal = 4095.;//if exceeding, accumulate last one + + // threshold for zero suppression is set on the basis of the noise + // A good value is 3*sigma_noise + if(k==0) threshold = res->GetNoiseP(ix); + else threshold = res->GetNoiseN(ix); + + threshold *= simpar->GetSSDZSThreshold(); // threshold at 3 sigma noise + + if(signal < threshold) continue; + //cout<GetNEntries()){ + // only three in digit. + tracks[j1] = pList->GetTrack(k,ix,j1); + hits[j1] = pList->GetHit(k,ix,j1); + }else{ + tracks[j1] = -3; + hits[j1] = -1; + } // end for j1 + // finally add digit + aliITS->AddSimDigit(2,0,digits,tracks,hits,charges); + } // end for ix } // end for k delete [] digits; delete [] tracks; @@ -633,5 +843,3 @@ istream &operator>>(istream &os,AliITSsimulationSSD &source){ - -