// 2 - Fixed step size
//
-/* if (t == 1) {
- AliWarning("Sorry, Geant parametrization step manager is not implemented yet. Please ask K.Oyama for detail.");
- }
-*/
fTypeOfStepManager = t;
AliInfo(Form("Step Manager type %d was selected",fTypeOfStepManager));
// to Bethe-Bloch. The energy distribution of the delta electrons follows
// a spectrum taken from Geant3.
//
+ // Version by A. Bercuci
+ //
+
Int_t pla = 0;
Int_t cha = 0;
Int_t sec = 0;
Double_t pTot = 0;
Double_t eDelta;
Double_t betaGamma, pp;
- Double_t stepSize=0;
+ Double_t stepSize = 0;
Bool_t drRegion = kFALSE;
Bool_t amRegion = kFALSE;
TLorentzVector pos, mom;
+ TArrayI processes;
+
const Int_t kNplan = AliTRDgeometry::Nplan();
const Int_t kNcham = AliTRDgeometry::Ncham();
const Int_t kNdetsec = kNplan * kNcham;
// Minimum energy for the step size adjustment
const Float_t kEkinMinStep = 1.0e-5;
// energy threshold for production of delta electrons
- const Float_t kECut = 1.0e4;
- // Parameters entering the parametrized range for delta electrons
- const float ra=5.37E-4, rb=0.9815, rc=3.123E-3;
- // Gas density -> To be made user adjustable !
- const float rho=0.004945 ; //[0.85*0.00549+0.15*0.00186 (Xe-CO2 85-15)]
+ const Float_t kECut = 1.0e4;
+ // Parameters entering the parametrized range for delta electrons
+ const Float_t kRa = 5.37E-4;
+ const Float_t kRb = 0.9815;
+ const Float_t kRc = 3.123E-3;
+ // Gas density -> To be made user adjustable !
+ const Float_t kRho = 0.004945 ; //[0.85*0.00549+0.15*0.00186 (Xe-CO2 85-15)]
// Plateau value of the energy-loss for electron in xenon
// taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253
// Use only charged tracks
if (( gMC->TrackCharge() ) &&
- (!gMC->IsTrackStop() ) &&
(!gMC->IsTrackDisappeared())) {
// Inside a sensitive volume?
* AliTRDgeometry::Nsect();
if (sens1 < sens2) {
if ((sec < sens1) || (sec >= sens2)) addthishit = 0;
- }
+ }
else {
if ((sec < sens1) && (sec >= sens2)) addthishit = 0;
- }
- }
+ }
+ }
}
// Add this hit
// Special hits only in the drift region
if (drRegion) {
+
// Create a track reference at the entrance and
// exit of each chamber that contain the
- // momentum components of the particle
+ // momentum components of the particle
if (gMC->IsTrackEntering() || gMC->IsTrackExiting()) {
gMC->TrackMomentum(mom);
AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
}
+
+ if (gMC->IsTrackEntering() && !gMC->IsNewTrack()) {
+ // determine if hit belong to primary track
+ fPrimaryTrackPid = gAlice->GetMCApp()->GetCurrentTrackNumber();
+ // determine track length when entering the detector
+ fTrackLength0 = gMC->TrackLength();
+ }
- if (gMC->IsTrackEntering() && !gMC->IsNewTrack()) {
- // determine if hit belong to primary track
- fPrimaryTrackPid=gAlice->GetMCApp()->GetCurrentTrackNumber();
- //determine track length when entering the detector
- fTrackLength0=gMC->TrackLength();
- }
-
- // Create the hits from TR photons
+ // Create the hits from TR photons
if (fTR) CreateTRhit(det);
- }
- // Calculate the energy of the delta-electrons
- // modified by Alex Bercuci (A.Bercuci@gsi.de) on 26.01.06
- // take into account correlation with the underlying GEANT tracking
- // mechanism. see
- // http://www-linux.gsi.de/~abercuci/Contributions/TRD/index.html
+ }
- // determine the most significant process (last on the processes list)
- // which caused this hit
- TArrayI processes;
+ // Calculate the energy of the delta-electrons
+ // modified by Alex Bercuci (A.Bercuci@gsi.de) on 26.01.06
+ // take into account correlation with the underlying GEANT tracking
+ // mechanism. see
+ // http://www-linux.gsi.de/~abercuci/Contributions/TRD/index.html
+ //
+ // determine the most significant process (last on the processes list)
+ // which caused this hit
gMC->StepProcesses(processes);
- int nofprocesses=processes.GetSize(), pid;
- if(!nofprocesses) pid=0;
- else pid= processes[nofprocesses-1];
-
- // generate Edep according to GEANT parametrisation
- eDelta =TMath::Exp(fDeltaG->GetRandom()) - kPoti;
- eDelta=TMath::Max(eDelta,0.0);
- float pr_range=0.;
- float range=gMC->TrackLength()-fTrackLength0;
- // merge GEANT tracker information with localy cooked one
- if(gAlice->GetMCApp()->GetCurrentTrackNumber()==fPrimaryTrackPid) {
-// printf("primary pid=%d eDelta=%f\n",pid,eDelta);
- if(pid==27){
- if(eDelta>=kECut){
- pr_range=ra*eDelta*.001*(1.-rb/(1.+rc*eDelta*0.001))/rho;
- if(pr_range>=(3.7-range)) eDelta*=.1;
- }
- } else if(pid==1){
- if(eDelta<kECut) eDelta*=.5;
- else {
- pr_range=ra*eDelta*.001*(1.-rb/(1.+rc*eDelta*0.001))/rho;
- if(pr_range>=((AliTRDgeometry::DrThick()
- + AliTRDgeometry::AmThick())-range)) eDelta*=.05;
- else eDelta*=.5;
- }
- } else eDelta=0.;
- } else eDelta=0.;
+ Int_t nofprocesses = processes.GetSize();
+ Int_t pid;
+ if (!nofprocesses) {
+ pid = 0;
+ }
+ else {
+ pid = processes[nofprocesses-1];
+ }
+
+ // generate Edep according to GEANT parametrisation
+ eDelta = TMath::Exp(fDeltaG->GetRandom()) - kPoti;
+ eDelta = TMath::Max(eDelta,0.0);
+ Float_t pr_range = 0.0;
+ Float_t range = gMC->TrackLength() - fTrackLength0;
+ // merge GEANT tracker information with locally cooked one
+ if (gAlice->GetMCApp()->GetCurrentTrackNumber() == fPrimaryTrackPid) {
+ // printf("primary pid=%d eDelta=%f\n",pid,eDelta);
+ if (pid == 27) {
+ if (eDelta >= kECut) {
+ pr_range = kRa*eDelta*0.001*(1.0-kRb/(1.0+kRc*eDelta*0.001))/kRho;
+ if (pr_range >= (3.7-range)) eDelta *= 0.1;
+ }
+ }
+ else if (pid == 1) {
+ if (eDelta < kECut) {
+ eDelta *= 0.5;
+ }
+ else {
+ pr_range = kRa*eDelta*0.001*(1.0-kRb/(1.0+kRc*eDelta*0.001))/kRho;
+ if (pr_range >= ((AliTRDgeometry::DrThick()
+ + AliTRDgeometry::AmThick()) - range)) {
+ eDelta *= 0.05;
+ }
+ else {
+ eDelta *= 0.5;
+ }
+ }
+ }
+ else {
+ eDelta = 0.0;
+ }
+ }
+ else {
+ eDelta = 0.0;
+ }
// Generate the electron cluster size
- if(eDelta==0.) qTot=0;
- else qTot = ((Int_t) (eDelta / kWion) + 1);
- // Create a new dEdx hit
+ if (eDelta == 0.0) {
+ qTot = 0;
+ }
+ else {
+ qTot = ((Int_t) (eDelta / kWion) + 1);
+ }
+
+ // Create a new dEdx hit
AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(),det,hits,qTot, drRegion);
// Calculate the maximum step size for the next tracking step
if ((gMC->Etot() - aMass) > kEkinMinStep) {
// The energy loss according to Bethe Bloch
- iPdg = TMath::Abs(gMC->TrackPid());
- if ( (iPdg != kPdgElectron) ||
- ((iPdg == kPdgElectron) && (pTot < kPTotMaxEl))) {
+ iPdg = TMath::Abs(gMC->TrackPid());
+ if ((iPdg != kPdgElectron) ||
+ ((iPdg == kPdgElectron) && (pTot < kPTotMaxEl))) {
gMC->TrackMomentum(mom);
pTot = mom.Rho();
betaGamma = pTot / aMass;
pp = BetheBlochGeant(betaGamma);
- // Take charge > 1 into account
+ // Take charge > 1 into account
charge = gMC->TrackCharge();
- if (TMath::Abs(charge) > 1) pp = pp * charge*charge;
- } else { // Electrons above 20 Mev/c are at the plateau
- pp = kPrim * kPlateau;
+ if (TMath::Abs(charge) > 1) {
+ pp = pp * charge*charge;
+ }
+ }
+ else {
+ // Electrons above 20 Mev/c are at the plateau
+ pp = kPrim * kPlateau;
}
Int_t nsteps = 0;
do {nsteps = gRandom->Poisson(pp);} while(!nsteps);
stepSize = 1./nsteps;
gMC->SetMaxStep(stepSize);
+
}
+
}
+
}
+
}
+
}
//_____________________________________________________________________________
// Use only charged tracks
if (( gMC->TrackCharge() ) &&
- (!gMC->IsTrackStop() ) &&
(!gMC->IsTrackDisappeared())) {
// Inside a sensitive volume?
// If not charged track or already stopped or disappeared, just return.
if ((!gMC->TrackCharge()) ||
- gMC->IsTrackStop() ||
gMC->IsTrackDisappeared()) return;
// Inside a sensitive volume?
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff