/*
$Log$
+Revision 1.17.2.5 2000/10/15 23:40:01 cblume
+Remove AliTRDconst
+
+Revision 1.17.2.4 2000/10/06 16:49:46 cblume
+Made Getters const
+
+Revision 1.17.2.3 2000/10/04 16:34:58 cblume
+Replace include files by forward declarations
+
+Revision 1.17.2.2 2000/09/18 13:50:17 cblume
+Include TR photon generation and adapt to new AliTRDhit
+
+Revision 1.22 2000/06/27 13:08:50 cblume
+Changed to Copy(TObject &A) to appease the HP-compiler
+
Revision 1.21 2000/06/09 11:10:07 cblume
Compiler warnings and coding conventions, next round
#include <TMath.h>
#include <TVector.h>
#include <TRandom.h>
+#include <TF1.h>
#include "AliRun.h"
#include "AliMC.h"
#include "AliConst.h"
#include "AliTRDv1.h"
+#include "AliTRDhit.h"
#include "AliTRDmatrix.h"
#include "AliTRDgeometry.h"
+#include "AliTRDsim.h"
ClassImp(AliTRDv1)
-
//_____________________________________________________________________________
AliTRDv1::AliTRDv1():AliTRD()
fSensSectorRange = 0;
fDeltaE = NULL;
+ fTR = NULL;
}
fSensSectorRange = 0;
fDeltaE = NULL;
+ fTR = NULL;
SetBufferSize(128000);
//
if (fDeltaE) delete fDeltaE;
+ if (fTR) delete fTR;
}
((AliTRDv1 &) trd).fSensSector = fSensSector;
((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange;
- ((AliTRDv1 &) trd).fDeltaE = NULL;
+ fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE);
+ fTR->Copy(*((AliTRDv1 &) trd).fTR);
}
}
+//_____________________________________________________________________________
+void AliTRDv1::CreateTRhit(Int_t det)
+{
+ //
+ // Creates an electron cluster from a TR photon.
+ // The photon is assumed to be created a the end of the radiator. The
+ // distance after which it deposits its energy takes into account the
+ // absorbtion of the entrance window and of the gas mixture in drift
+ // volume.
+ //
+
+ // PDG code electron
+ const Int_t kPdgElectron = 11;
+
+ // Ionization energy
+ const Float_t kWion = 22.04;
+
+ // Maximum number of TR photons per track
+ const Int_t kNTR = 50;
+
+ TLorentzVector mom, pos;
+ TClonesArray &lhits = *fHits;
+
+ // Create TR only for electrons
+ Int_t iPdg = gMC->TrackPid();
+ if (TMath::Abs(iPdg) != kPdgElectron) return;
+
+ // Create TR at the entrance of the chamber
+ if (gMC->IsTrackEntering()) {
+
+ Float_t eTR[kNTR];
+ Int_t nTR;
+
+ // Create TR photons
+ gMC->TrackMomentum(mom);
+ Float_t pTot = mom.Rho();
+ fTR->CreatePhotons(iPdg,pTot,nTR,eTR);
+ if (nTR > kNTR) {
+ printf("AliTRDv1::CreateTRhit -- ");
+ printf("Boundary error: nTR = %d, kNTR = %d\n",nTR,kNTR);
+ exit(1);
+ }
+
+ // Loop through the TR photons
+ for (Int_t iTR = 0; iTR < nTR; iTR++) {
+
+ Float_t energyMeV = eTR[iTR] * 0.001;
+ Float_t energyeV = eTR[iTR] * 1000.0;
+ Float_t absLength = 0;
+ Float_t sigma = 0;
+
+ // Take the absorbtion in the entrance window into account
+ Double_t muMy = fTR->GetMuMy(energyMeV);
+ sigma = muMy * fFoilDensity;
+ absLength = gRandom->Exp(sigma);
+ if (absLength < AliTRDgeometry::MyThick()) continue;
+
+ // The absorbtion cross sections in the drift gas
+ if (fGasMix == 1) {
+ // Gas-mixture (Xe/CO2)
+ Double_t muXe = fTR->GetMuXe(energyMeV);
+ Double_t muCO = fTR->GetMuCO(energyMeV);
+ sigma = (0.90 * muXe + 0.10 * muCO) * fGasDensity;
+ }
+ else {
+ // Gas-mixture (Xe/Isobutane)
+ Double_t muXe = fTR->GetMuXe(energyMeV);
+ Double_t muBu = fTR->GetMuBu(energyMeV);
+ sigma = (0.97 * muXe + 0.03 * muBu) * fGasDensity;
+ }
+
+ // The distance after which the energy of the TR photon
+ // is deposited.
+ absLength = gRandom->Exp(sigma);
+ if (absLength > AliTRDgeometry::DrThick()) continue;
+
+ // The position of the absorbtion
+ Float_t posHit[3];
+ gMC->TrackPosition(pos);
+ posHit[0] = pos[0] + mom[0] / pTot * absLength;
+ posHit[1] = pos[1] + mom[1] / pTot * absLength;
+ posHit[2] = pos[2] + mom[2] / pTot * absLength;
+
+ // Create the charge
+ Int_t q = ((Int_t) (energyeV / kWion));
+
+ // Add the hit to the array. TR photon hits are marked
+ // by negative charge
+ new(lhits[fNhits++]) AliTRDhit(fIshunt,gAlice->CurrentTrack()
+ ,det,posHit,-q);
+
+ }
+
+ }
+
+}
+
//_____________________________________________________________________________
void AliTRDv1::Init()
{
if (fSensSector >= 0) {
Int_t sens1 = fSensSector;
Int_t sens2 = fSensSector + fSensSectorRange;
- sens2 -= ((Int_t) (sens2 / kNsect)) * kNsect;
+ sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
+ * AliTRDgeometry::Nsect();
printf(" Only sectors %d - %d are sensitive\n",sens1,sens2-1);
}
}
+ if (fTR)
+ printf(" TR simulation on\n");
+ else
+ printf(" TR simulation off\n");
printf("\n");
// First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2)
// Ermilova distribution for the delta-ray spectrum
Float_t poti = TMath::Log(kPoti);
Float_t eEnd = TMath::Log(kEend);
- fDeltaE = new TF1("deltae",Ermilova,poti,eEnd,0);
+ fDeltaE = new TF1("deltae",Ermilova,poti,eEnd,0);
// Identifier of the sensitive volume (drift region)
fIdSens = gMC->VolId("UL05");
}
+//_____________________________________________________________________________
+AliTRDsim *AliTRDv1::CreateTR()
+{
+ //
+ // Enables the simulation of TR
+ //
+
+ fTR = new AliTRDsim();
+ return fTR;
+
+}
+
//_____________________________________________________________________________
void AliTRDv1::SetSensPlane(Int_t iplane)
{
Int_t pla = 0;
Int_t cha = 0;
Int_t sec = 0;
+ Int_t det = 0;
Int_t iPdg;
+ Int_t qTot;
- Int_t det[1];
-
- Float_t hits[4];
+ Float_t hits[3];
Float_t random[1];
Float_t charge;
Float_t aMass;
Double_t pTot;
- Double_t qTot;
Double_t eDelta;
Double_t betaGamma, pp;
eDelta = TMath::Max(eDelta,0.0);
// The number of secondary electrons created
- qTot = (Double_t) ((Int_t) (eDelta / kWion) + 1);
+ qTot = ((Int_t) (eDelta / kWion) + 1);
// The hit coordinates and charge
gMC->TrackPosition(pos);
hits[0] = pos[0];
hits[1] = pos[1];
hits[2] = pos[2];
- hits[3] = qTot;
// The sector number (0 - 17)
// The numbering goes clockwise and starts at y = 0
if (fSensSector >= 0) {
Int_t sens1 = fSensSector;
Int_t sens2 = fSensSector + fSensSectorRange;
- sens2 -= ((Int_t) (sens2 / kNsect)) * kNsect;
+ sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
+ * AliTRDgeometry::Nsect();
if (sens1 < sens2) {
if ((sec < sens1) || (sec >= sens2)) addthishit = 0;
}
// Add this hit
if (addthishit) {
- det[0] = fGeometry->GetDetector(pla,cha,sec);
+ det = fGeometry->GetDetector(pla,cha,sec);
+
+ // Create the electron cluster from TR photons
+ if (fTR) CreateTRhit(det);
+
new(lhits[fNhits++]) AliTRDhit(fIshunt
,gAlice->CurrentTrack()
,det
- ,hits);
+ ,hits
+ ,qTot);
// The energy loss according to Bethe Bloch
gMC->TrackMomentum(mom);
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff