* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.29 2001/05/16 14:57:28 alibrary
-New files for folders and Stack
-
-Revision 1.28 2001/05/07 08:03:22 cblume
-Generate also hits in the amplification region
-
-Revision 1.27 2001/03/30 14:40:15 cblume
-Update of the digitization parameter
-
-Revision 1.26 2000/11/30 17:38:08 cblume
-Changes to get in line with new STEER and EVGEN
-
-Revision 1.25 2000/11/15 14:30:16 cblume
-Fixed bug in calculating detector no. of extra hit
-
-Revision 1.24 2000/11/10 14:58:36 cblume
-Introduce additional hit with amplitude 0 at the chamber borders
-
-Revision 1.23 2000/11/01 14:53:21 cblume
-Merge with TRD-develop
-
-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
-
-Revision 1.20 2000/06/08 18:32:58 cblume
-Make code compliant to coding conventions
-
-Revision 1.19 2000/06/07 16:27:32 cblume
-Try to remove compiler warnings on Sun and HP
-
-Revision 1.18 2000/05/08 16:17:27 cblume
-Merge TRD-develop
-
-Revision 1.17.2.1 2000/05/08 14:59:16 cblume
-Made inline function non-virtual. Bug fix in setting sensitive chamber
-
-Revision 1.17 2000/02/28 19:10:26 cblume
-Include the new TRD classes
-
-Revision 1.16.4.1 2000/02/28 18:04:35 cblume
-Change to new hit version, introduce geometry class, and move digitization and clustering to AliTRDdigitizer/AliTRDclusterizerV1
-
-Revision 1.16 1999/11/05 22:50:28 fca
-Do not use Atan, removed from ROOT too
-
-Revision 1.15 1999/11/02 17:20:19 fca
-initialise nbytes before using it
-
-Revision 1.14 1999/11/02 17:15:54 fca
-Correct ansi scoping not accepted by HP compilers
-
-Revision 1.13 1999/11/02 17:14:51 fca
-Correct ansi scoping not accepted by HP compilers
-
-Revision 1.12 1999/11/02 16:35:56 fca
-New version of TRD introduced
-
-Revision 1.11 1999/11/01 20:41:51 fca
-Added protections against using the wrong version of FRAME
-
-Revision 1.10 1999/09/29 09:24:35 fca
-Introduction of the Copyright and cvs Log
-
-*/
+/* $Id$ */
///////////////////////////////////////////////////////////////////////////////
// //
#include <stdlib.h>
-#include <TMath.h>
-#include <TVector.h>
-#include <TRandom.h>
#include <TF1.h>
#include <TLorentzVector.h>
+#include <TMath.h>
+#include <TRandom.h>
+#include <TVector.h>
+#include <TVirtualMC.h>
-#include "AliRun.h"
-#include "AliMC.h"
#include "AliConst.h"
-
-#include "AliTRDv1.h"
-#include "AliTRDhit.h"
-#include "AliTRDmatrix.h"
+#include "AliLog.h"
+#include "AliMC.h"
+#include "AliRun.h"
#include "AliTRDgeometry.h"
+#include "AliTRDhit.h"
#include "AliTRDsim.h"
+#include "AliTRDv1.h"
ClassImp(AliTRDv1)
// Default constructor
//
- fIdSensDr = 0;
- fIdSensAm = 0;
+ fSensSelect = 0;
+ fSensPlane = -1;
+ fSensChamber = -1;
+ fSensSector = -1;
+ fSensSectorRange = 0;
- fIdChamber1 = 0;
- fIdChamber2 = 0;
- fIdChamber3 = 0;
+ fDeltaE = NULL;
+ fDeltaG = NULL;
+ fTR = NULL;
+ fTRon = kFALSE;
- fSensSelect = 0;
- fSensPlane = -1;
- fSensChamber = -1;
- fSensSector = -1;
- fSensSectorRange = 0;
-
- fDeltaE = NULL;
- fTR = NULL;
+ fStepSize = 0.1;
+ fTypeOfStepManager = 1;
}
// Standard constructor for Transition Radiation Detector version 1
//
- fIdSensDr = 0;
- fIdSensAm = 0;
-
- fIdChamber1 = 0;
- fIdChamber2 = 0;
- fIdChamber3 = 0;
+ fSensSelect = 0;
+ fSensPlane = -1;
+ fSensChamber = -1;
+ fSensSector = -1;
+ fSensSectorRange = 0;
- fSensSelect = 0;
- fSensPlane = -1;
- fSensChamber = -1;
- fSensSector = -1;
- fSensSectorRange = 0;
-
- fDeltaE = NULL;
- fTR = NULL;
+ fDeltaE = NULL;
+ fDeltaG = NULL;
+ fTR = NULL;
+ fTRon = kTRUE;
+ fStepSize = 0.1;
+ fTypeOfStepManager = 1;
SetBufferSize(128000);
}
//_____________________________________________________________________________
-AliTRDv1::AliTRDv1(const AliTRDv1 &trd)
+AliTRDv1::AliTRDv1(const AliTRDv1 &trd):AliTRD(trd)
{
//
// Copy constructor
//
if (fDeltaE) delete fDeltaE;
+ if (fDeltaG) delete fDeltaG;
if (fTR) delete fTR;
}
}
//_____________________________________________________________________________
-void AliTRDv1::Copy(TObject &trd)
+void AliTRDv1::Copy(TObject &trd) const
{
+ printf("void AliTRDv1::Copy(TObject &trd) const\n");
//
// Copy function
//
- ((AliTRDv1 &) trd).fIdSensDr = fIdSensDr;
- ((AliTRDv1 &) trd).fIdSensAm = fIdSensAm;
+ ((AliTRDv1 &) trd).fSensSelect = fSensSelect;
+ ((AliTRDv1 &) trd).fSensPlane = fSensPlane;
+ ((AliTRDv1 &) trd).fSensChamber = fSensChamber;
+ ((AliTRDv1 &) trd).fSensSector = fSensSector;
+ ((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange;
- ((AliTRDv1 &) trd).fIdChamber1 = fIdChamber1;
- ((AliTRDv1 &) trd).fIdChamber2 = fIdChamber2;
- ((AliTRDv1 &) trd).fIdChamber3 = fIdChamber3;
+ ((AliTRDv1 &) trd).fTypeOfStepManager = fTypeOfStepManager;
+ ((AliTRDv1 &) trd).fStepSize = fStepSize;
- ((AliTRDv1 &) trd).fSensSelect = fSensSelect;
- ((AliTRDv1 &) trd).fSensPlane = fSensPlane;
- ((AliTRDv1 &) trd).fSensChamber = fSensChamber;
- ((AliTRDv1 &) trd).fSensSector = fSensSector;
- ((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange;
+ ((AliTRDv1 &) trd).fTRon = fTRon;
fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE);
+ fDeltaG->Copy(*((AliTRDv1 &) trd).fDeltaG);
fTR->Copy(*((AliTRDv1 &) trd).fTR);
}
const Int_t kPdgElectron = 11;
// Ionization energy
- const Float_t kWion = 22.04;
+ const Float_t kWion = 23.53;
// Maximum number of TR photons per track
const Int_t kNTR = 50;
TLorentzVector mom, pos;
- TClonesArray &lhits = *fHits;
// Create TR at the entrance of the chamber
if (gMC->IsTrackEntering()) {
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);
+ AliFatal(Form("Boundary error: nTR = %d, kNTR = %d",nTR,kNTR));
}
// Loop through the TR photons
// 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 = (0.85 * muXe + 0.15 * muCO) * fGasDensity;
+ if (sigma > 0.0) {
+ absLength = gRandom->Exp(1.0/sigma);
+ if (absLength < AliTRDgeometry::MyThick()) continue;
}
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;
+ continue;
}
+ // The absorbtion cross sections in the drift gas
+ // Gas-mixture (Xe/CO2)
+ Double_t muXe = fTR->GetMuXe(energyMeV);
+ Double_t muCO = fTR->GetMuCO(energyMeV);
+ sigma = (0.85 * muXe + 0.15 * muCO) * fGasDensity * fTR->GetTemp();
+
// The distance after which the energy of the TR photon
// is deposited.
- absLength = gRandom->Exp(sigma);
- if (absLength > AliTRDgeometry::DrThick()) continue;
+ if (sigma > 0.0) {
+ absLength = gRandom->Exp(1.0/sigma);
+ if (absLength > (AliTRDgeometry::DrThick()
+ + AliTRDgeometry::AmThick())) {
+ continue;
+ }
+ }
+ else {
+ 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;
+ 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
- AliTRDhit *hit = new(lhits[fNhits++]) AliTRDhit(fIshunt
- ,gAlice->CurrentTrack()
- ,det,posHit,-q);
- hit->SetTRphoton();
+ AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(),det,posHit,-q,kTRUE);
}
AliTRD::Init();
- if(fDebug) printf("%s: Slow simulator\n",ClassName());
+ AliDebug(1,"Slow simulator\n");
if (fSensSelect) {
if (fSensPlane >= 0)
- printf(" Only plane %d is sensitive\n",fSensPlane);
+ AliInfo(Form("Only plane %d is sensitive"));
if (fSensChamber >= 0)
- printf(" Only chamber %d is sensitive\n",fSensChamber);
+ AliInfo(Form("Only chamber %d is sensitive",fSensChamber));
if (fSensSector >= 0) {
Int_t sens1 = fSensSector;
Int_t sens2 = fSensSector + fSensSectorRange;
sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
* AliTRDgeometry::Nsect();
- printf(" Only sectors %d - %d are sensitive\n",sens1,sens2-1);
+ AliInfo(Form("Only sectors %d - %d are sensitive\n",sens1,sens2-1));
}
}
- if (fTR)
- printf("%s: TR simulation on\n",ClassName());
- else
- printf("%s: TR simulation off\n",ClassName());
- printf("\n");
+
+ // Switch on TR simulation as default
+ if (!fTRon) {
+ AliInfo("TR simulation off");
+ }
+ else {
+ fTR = new AliTRDsim();
+ }
// First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2)
const Float_t kPoti = 12.1;
// 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);
-
- // Identifier of the sensitive volume (drift region)
- fIdSensDr = gMC->VolId("UL05");
- // Identifier of the sensitive volume (amplification region)
- fIdSensAm = gMC->VolId("UL06");
-
- // Identifier of the TRD-driftchambers
- fIdChamber1 = gMC->VolId("UCIO");
- fIdChamber2 = gMC->VolId("UCIM");
- fIdChamber3 = gMC->VolId("UCII");
-
- if(fDebug) {
- printf("%s: ",ClassName());
- for (Int_t i = 0; i < 80; i++) printf("*");
- printf("\n");
- }
-}
+ // Ermilova distribution for the delta-ray spectrum
+ fDeltaE = new TF1("deltae" ,Ermilova ,poti,eEnd,0);
-//_____________________________________________________________________________
-AliTRDsim *AliTRDv1::CreateTR()
-{
- //
- // Enables the simulation of TR
- //
+ // Geant3 distribution for the delta-ray spectrum
+ fDeltaG = new TF1("deltag",IntSpecGeant,2.421257,28.536469,0);
- fTR = new AliTRDsim();
- return fTR;
+ AliDebug(1,"+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
}
//
if ((iplane < 0) || (iplane > 5)) {
- printf("Wrong input value: %d\n",iplane);
- printf("Use standard setting\n");
+ AliWarning(Form("Wrong input value:%d",iplane));
+ AliWarning("Use standard setting");
fSensPlane = -1;
fSensSelect = 0;
return;
//
if ((ichamber < 0) || (ichamber > 4)) {
- printf("Wrong input value: %d\n",ichamber);
- printf("Use standard setting\n");
+ AliWarning(Form("Wrong input value: %d",ichamber));
+ AliWarning("Use standard setting");
fSensChamber = -1;
fSensSelect = 0;
return;
//
if ((isector < 0) || (isector > 17)) {
- printf("Wrong input value <isector>: %d\n",isector);
- printf("Use standard setting\n");
+ AliWarning(Form("Wrong input value <isector>: %d",isector));
+ AliWarning("Use standard setting");
fSensSector = -1;
fSensSectorRange = 0;
fSensSelect = 0;
}
if ((nsector < 1) || (nsector > 18)) {
- printf("Wrong input value <nsector>: %d\n",nsector);
- printf("Use standard setting\n");
+ AliWarning(Form("Wrong input value <nsector>: %d",nsector));
+ AliWarning("Use standard setting");
fSensSector = -1;
fSensSectorRange = 0;
fSensSelect = 0;
//_____________________________________________________________________________
void AliTRDv1::StepManager()
+{
+ //
+ // Slow simulator. Every charged track produces electron cluster as hits
+ // along its path across the drift volume.
+ //
+
+ switch (fTypeOfStepManager) {
+ case 0 : StepManagerErmilova(); break; // 0 is Ermilova
+ case 1 : StepManagerGeant(); break; // 1 is Geant
+ case 2 : StepManagerFixedStep(); break; // 2 is fixed step
+ default : AliWarning("Not a valid Step Manager.");
+ }
+
+}
+
+//_____________________________________________________________________________
+void AliTRDv1::SelectStepManager(Int_t t)
+{
+ //
+ // Selects a step manager type:
+ // 0 - Ermilova
+ // 1 - Geant3
+ // 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));
+
+}
+
+//_____________________________________________________________________________
+void AliTRDv1::StepManagerGeant()
+{
+ //
+ // Slow simulator. Every charged track produces electron cluster as hits
+ // along its path across the drift volume. The step size is set acording
+ // to Bethe-Bloch. The energy distribution of the delta electrons follows
+ // a spectrum taken from Geant3.
+ //
+ Int_t pla = 0;
+ Int_t cha = 0;
+ Int_t sec = 0;
+ Int_t det = 0;
+ Int_t iPdg;
+ Int_t qTot;
+
+ Float_t hits[3];
+ Float_t charge;
+ Float_t aMass;
+
+ Double_t pTot = 0;
+ Double_t eDelta;
+ Double_t betaGamma, pp;
+ Double_t stepSize=0;
+
+ Bool_t drRegion = kFALSE;
+ Bool_t amRegion = kFALSE;
+
+ TString cIdCurrent;
+ TString cIdSensDr = "J";
+ TString cIdSensAm = "K";
+ Char_t cIdChamber[3];
+ cIdChamber[2] = 0;
+
+ TLorentzVector pos, mom;
+
+ const Int_t kNplan = AliTRDgeometry::Nplan();
+ const Int_t kNcham = AliTRDgeometry::Ncham();
+ const Int_t kNdetsec = kNplan * kNcham;
+
+ const Double_t kBig = 1.0E+12; // Infinitely big
+ const Float_t kWion = 23.53; // Ionization energy
+ const Float_t kPTotMaxEl = 0.002; // Maximum momentum for e+ e- g
+
+ // 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)]
+
+ // Plateau value of the energy-loss for electron in xenon
+ // taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253
+ //const Double_t kPlateau = 1.70;
+ // the averaged value (26/3/99)
+ const Float_t kPlateau = 1.55;
+
+ const Float_t kPrim = 19.34; // dN1/dx|min for the gas mixture (90% Xe + 10% CO2)
+ // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2)
+ const Float_t kPoti = 12.1;
+
+ const Int_t kPdgElectron = 11; // PDG code electron
+
+ // Set the maximum step size to a very large number for all
+ // neutral particles and those outside the driftvolume
+ gMC->SetMaxStep(kBig);
+
+ // Use only charged tracks
+ if (( gMC->TrackCharge() ) &&
+ (!gMC->IsTrackStop() ) &&
+ (!gMC->IsTrackDisappeared())) {
+
+ // Inside a sensitive volume?
+ drRegion = kFALSE;
+ amRegion = kFALSE;
+ cIdCurrent = gMC->CurrentVolName();
+ if (cIdSensDr == cIdCurrent[1]) {
+ drRegion = kTRUE;
+ }
+ if (cIdSensAm == cIdCurrent[1]) {
+ amRegion = kTRUE;
+ }
+ if (drRegion || amRegion) {
+
+ // The hit coordinates and charge
+ gMC->TrackPosition(pos);
+ hits[0] = pos[0];
+ hits[1] = pos[1];
+ hits[2] = pos[2];
+
+ // The sector number (0 - 17)
+ // The numbering goes clockwise and starts at y = 0
+ Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]);
+ if (phi < 90.)
+ phi = phi + 270.;
+ else
+ phi = phi - 90.;
+ sec = ((Int_t) (phi / 20));
+
+ // The plane and chamber number
+ cIdChamber[0] = cIdCurrent[2];
+ cIdChamber[1] = cIdCurrent[3];
+ Int_t idChamber = (atoi(cIdChamber) % kNdetsec);
+ cha = kNcham - ((Int_t) idChamber / kNplan) - 1;
+ pla = ((Int_t) idChamber % kNplan);
+
+ // Check on selected volumes
+ Int_t addthishit = 1;
+ if (fSensSelect) {
+ if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0;
+ if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0;
+ if (fSensSector >= 0) {
+ Int_t sens1 = fSensSector;
+ Int_t sens2 = fSensSector + fSensSectorRange;
+ sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
+ * AliTRDgeometry::Nsect();
+ if (sens1 < sens2) {
+ if ((sec < sens1) || (sec >= sens2)) addthishit = 0;
+ }
+ else {
+ if ((sec < sens1) && (sec >= sens2)) addthishit = 0;
+ }
+ }
+ }
+
+ // Add this hit
+ if (addthishit) {
+
+ // The detector number
+ det = fGeometry->GetDetector(pla,cha,sec);
+
+ // 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
+ 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();
+ }
+
+ // 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;
+ 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.;
+
+ // Generate the electron cluster size
+ if(eDelta==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
+ // Produce only one hit if Ekin is below cutoff
+ aMass = gMC->TrackMass();
+ if ((gMC->Etot() - aMass) > kEkinMinStep) {
+
+ // The energy loss according to Bethe Bloch
+ 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
+ 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;
+ }
+
+ Int_t nsteps = 0;
+ do {nsteps = gRandom->Poisson(pp);} while(!nsteps);
+ stepSize = 1./nsteps;
+ gMC->SetMaxStep(stepSize);
+ }
+ }
+ }
+ }
+}
+
+//_____________________________________________________________________________
+void AliTRDv1::StepManagerErmilova()
{
//
// Slow simulator. Every charged track produces electron cluster as hits
// a spectrum taken from Ermilova et al.
//
- Int_t iIdSens, icSens;
- Int_t iIdChamber, icChamber;
Int_t pla = 0;
Int_t cha = 0;
Int_t sec = 0;
Int_t qTot;
Float_t hits[3];
- Float_t moms[3];
- Float_t random[1];
+ Double_t random[1];
Float_t charge;
Float_t aMass;
Double_t betaGamma, pp;
Double_t stepSize;
+ Bool_t drRegion = kFALSE;
+ Bool_t amRegion = kFALSE;
+
+ TString cIdCurrent;
+ TString cIdSensDr = "J";
+ TString cIdSensAm = "K";
+ Char_t cIdChamber[3];
+ cIdChamber[2] = 0;
+
TLorentzVector pos, mom;
- TClonesArray &lhits = *fHits;
- const Double_t kBig = 1.0E+12;
+ const Int_t kNplan = AliTRDgeometry::Nplan();
+ const Int_t kNcham = AliTRDgeometry::Ncham();
+ const Int_t kNdetsec = kNplan * kNcham;
+
+ const Double_t kBig = 1.0E+12; // Infinitely big
+ const Float_t kWion = 23.53; // Ionization energy
+ const Float_t kPTotMaxEl = 0.002; // Maximum momentum for e+ e- g
+
+ // 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)]
- // Ionization energy
- const Float_t kWion = 22.04;
- // Maximum momentum for e+ e- g
- const Float_t kPTotMaxEl = 0.002;
// Minimum energy for the step size adjustment
const Float_t kEkinMinStep = 1.0e-5;
+
// Plateau value of the energy-loss for electron in xenon
// taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253
//const Double_t kPlateau = 1.70;
// the averaged value (26/3/99)
const Float_t kPlateau = 1.55;
- // dN1/dx|min for the gas mixture (90% Xe + 10% CO2)
- const Float_t kPrim = 48.0;
+
+ const Float_t kPrim = 48.0; // dN1/dx|min for the gas mixture (90% Xe + 10% CO2)
// First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2)
const Float_t kPoti = 12.1;
- // PDG code electron
- const Int_t kPdgElectron = 11;
+ const Int_t kPdgElectron = 11; // PDG code electron
// Set the maximum step size to a very large number for all
// neutral particles and those outside the driftvolume
(!gMC->IsTrackDisappeared())) {
// Inside a sensitive volume?
- iIdSens = gMC->CurrentVolID(icSens);
- if ((iIdSens == fIdSensDr) ||
- (iIdSens == fIdSensAm)) {
-
- iIdChamber = gMC->CurrentVolOffID(1,icChamber);
+ drRegion = kFALSE;
+ amRegion = kFALSE;
+ cIdCurrent = gMC->CurrentVolName();
+ if (cIdSensDr == cIdCurrent[1]) {
+ drRegion = kTRUE;
+ }
+ if (cIdSensAm == cIdCurrent[1]) {
+ amRegion = kTRUE;
+ }
+ if (drRegion || amRegion) {
// The hit coordinates and charge
gMC->TrackPosition(pos);
phi = phi - 90.;
sec = ((Int_t) (phi / 20));
- // The chamber number
- // 0: outer left
- // 1: middle left
- // 2: inner
- // 3: middle right
- // 4: outer right
- if (iIdChamber == fIdChamber1)
- cha = (hits[2] < 0 ? 0 : 4);
- else if (iIdChamber == fIdChamber2)
- cha = (hits[2] < 0 ? 1 : 3);
- else if (iIdChamber == fIdChamber3)
- cha = 2;
-
- // The plane number
- // The numbering starts at the innermost plane
- pla = icChamber - TMath::Nint((Float_t) (icChamber / 7)) * 6 - 1;
+ // The plane and chamber number
+ cIdChamber[0] = cIdCurrent[2];
+ cIdChamber[1] = cIdCurrent[3];
+ Int_t idChamber = (atoi(cIdChamber) % kNdetsec);
+ cha = kNcham - ((Int_t) idChamber / kNplan) - 1;
+ pla = ((Int_t) idChamber % kNplan);
// Check on selected volumes
Int_t addthishit = 1;
* AliTRDgeometry::Nsect();
if (sens1 < sens2) {
if ((sec < sens1) || (sec >= sens2)) addthishit = 0;
- }
+ }
else {
if ((sec < sens1) && (sec >= sens2)) addthishit = 0;
- }
- }
+ }
+ }
}
// Add this hit
// The detector number
det = fGeometry->GetDetector(pla,cha,sec);
- // Special hits and TR photons only in the drift region
- if (iIdSens == fIdSensDr) {
+ // Special hits only in the drift region
+ if (drRegion) {
- // Create some special hits with amplitude 0 at the entrance and
- // exit of each chamber that contain the momentum components of the particle
+ // Create a track reference at the entrance and
+ // exit of each chamber that contain the
+ // momentum components of the particle
if (gMC->IsTrackEntering() || gMC->IsTrackExiting()) {
gMC->TrackMomentum(mom);
- moms[0] = mom[0];
- moms[1] = mom[1];
- moms[2] = mom[2];
- AliTRDhit *hitTest = new(lhits[fNhits++]) AliTRDhit(fIshunt
- ,gAlice->CurrentTrack()
- ,det,moms,0);
- hitTest->SetTest();
+ AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
}
-
// Create the hits from TR photons
if (fTR) CreateTRhit(det);
+ }
- }
// Calculate the energy of the delta-electrons
eDelta = TMath::Exp(fDeltaE->GetRandom()) - kPoti;
eDelta = TMath::Max(eDelta,0.0);
-
- // The number of secondary electrons created
- qTot = ((Int_t) (eDelta / kWion) + 1);
-
- // Create a new dEdx hit
- AliTRDhit *hit = new(lhits[fNhits++]) AliTRDhit(fIshunt
- ,gAlice->CurrentTrack()
- ,det,hits,qTot);
- if (iIdSens == fIdSensDr) {
- hit->SetDrift();
- }
+ // Generate the electron cluster size
+ if(eDelta==0.) qTot=0;
+ else qTot = ((Int_t) (eDelta / kWion) + 1);
+
+ // Create a new dEdx hit
+ if (drRegion) {
+ AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber()
+ ,det,hits,qTot, kTRUE);
+ }
else {
- hit->SetAmplification();
- }
+ AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber()
+ ,det,hits,qTot,kFALSE);
+ }
// Calculate the maximum step size for the next tracking step
// Produce only one hit if Ekin is below cutoff
// The energy loss according to Bethe Bloch
iPdg = TMath::Abs(gMC->TrackPid());
if ( (iPdg != kPdgElectron) ||
- ((iPdg == kPdgElectron) && (pTot < kPTotMaxEl))) {
+ ((iPdg == kPdgElectron) && (pTot < kPTotMaxEl))) {
gMC->TrackMomentum(mom);
pTot = mom.Rho();
betaGamma = pTot / aMass;
// Take charge > 1 into account
charge = gMC->TrackCharge();
if (TMath::Abs(charge) > 1) pp = pp * charge*charge;
- }
- // Electrons above 20 Mev/c are at the plateau
- else {
- pp = kPrim * kPlateau;
+ } else { // Electrons above 20 Mev/c are at the plateau
+ pp = kPrim * kPlateau;
}
if (pp > 0) {
do
- gMC->Rndm(random,1);
+ gMC->GetRandom()->RndmArray(1, random);
while ((random[0] == 1.) || (random[0] == 0.));
stepSize = - TMath::Log(random[0]) / pp;
gMC->SetMaxStep(stepSize);
- }
+ }
+ }
+ }
+ }
+ }
+}
- }
+//_____________________________________________________________________________
+void AliTRDv1::StepManagerFixedStep()
+{
+ //
+ // Slow simulator. Every charged track produces electron cluster as hits
+ // along its path across the drift volume. The step size is fixed in
+ // this version of the step manager.
+ //
+
+ Int_t pla = 0;
+ Int_t cha = 0;
+ Int_t sec = 0;
+ Int_t det = 0;
+ Int_t qTot;
+ Float_t hits[3];
+ Double_t eDep;
+
+ Bool_t drRegion = kFALSE;
+ Bool_t amRegion = kFALSE;
+
+ TString cIdCurrent;
+ TString cIdSensDr = "J";
+ TString cIdSensAm = "K";
+ Char_t cIdChamber[3];
+ cIdChamber[2] = 0;
+
+ TLorentzVector pos, mom;
+
+ const Int_t kNplan = AliTRDgeometry::Nplan();
+ const Int_t kNcham = AliTRDgeometry::Ncham();
+ const Int_t kNdetsec = kNplan * kNcham;
+
+ const Double_t kBig = 1.0E+12;
+
+ const Float_t kWion = 23.53; // Ionization energy
+ const Float_t kEkinMinStep = 1.0e-5; // Minimum energy for the step size adjustment
+
+ // Set the maximum step size to a very large number for all
+ // neutral particles and those outside the driftvolume
+ gMC->SetMaxStep(kBig);
+
+ // If not charged track or already stopped or disappeared, just return.
+ if ((!gMC->TrackCharge()) ||
+ gMC->IsTrackStop() ||
+ gMC->IsTrackDisappeared()) return;
+
+ // Inside a sensitive volume?
+ cIdCurrent = gMC->CurrentVolName();
+
+ if (cIdSensDr == cIdCurrent[1]) drRegion = kTRUE;
+ if (cIdSensAm == cIdCurrent[1]) amRegion = kTRUE;
+
+ if ((!drRegion) && (!amRegion)) return;
+
+ // The hit coordinates and charge
+ gMC->TrackPosition(pos);
+ hits[0] = pos[0];
+ hits[1] = pos[1];
+ hits[2] = pos[2];
+
+ // The sector number (0 - 17)
+ // The numbering goes clockwise and starts at y = 0
+ Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]);
+ if (phi < 90.) phi += 270.;
+ else phi -= 90.;
+ sec = ((Int_t) (phi / 20.));
+
+ // The plane and chamber number
+ cIdChamber[0] = cIdCurrent[2];
+ cIdChamber[1] = cIdCurrent[3];
+ Int_t idChamber = (atoi(cIdChamber) % kNdetsec);
+ cha = kNcham - ((Int_t) idChamber / kNplan) - 1;
+ pla = ((Int_t) idChamber % kNplan);
+
+ // Check on selected volumes
+ Int_t addthishit = 1;
+ if(fSensSelect) {
+ if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0;
+ if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0;
+ if (fSensSector >= 0) {
+ Int_t sens1 = fSensSector;
+ Int_t sens2 = fSensSector + fSensSectorRange;
+ sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) * AliTRDgeometry::Nsect();
+ if (sens1 < sens2) {
+ if ((sec < sens1) || (sec >= sens2)) addthishit = 0;
+ }
+ else {
+ if ((sec < sens1) && (sec >= sens2)) addthishit = 0;
}
+ }
+ }
+
+ if (!addthishit) return;
+
+ det = fGeometry->GetDetector(pla,cha,sec); // The detector number
+
+ Int_t trkStat = 0; // 0: InFlight 1:Entering 2:Exiting
+ // 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
+
+ if (gMC->IsTrackEntering()) {
+ gMC->TrackMomentum(mom);
+ AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
+ trkStat = 1;
}
+ if (gMC->IsTrackExiting()) {
+ gMC->TrackMomentum(mom);
+ AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
+ trkStat = 2;
+ }
+
+ // Create the hits from TR photons
+ if (fTR) CreateTRhit(det);
}
+
+ // Calculate the charge according to GEANT Edep
+ // Create a new dEdx hit
+ eDep = TMath::Max(gMC->Edep(),0.0) * 1.0e+09;
+ qTot = (Int_t) (eDep / kWion);
+ AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber()
+ ,det,hits,qTot,drRegion);
+
+ // Set Maximum Step Size
+ // Produce only one hit if Ekin is below cutoff
+ if ((gMC->Etot() - gMC->TrackMass()) < kEkinMinStep) return;
+ gMC->SetMaxStep(fStepSize);
}
}
+//_____________________________________________________________________________
+Double_t AliTRDv1::BetheBlochGeant(Double_t bg)
+{
+ //
+ // Return dN/dx (number of primary collisions per centimeter)
+ // for given beta*gamma factor.
+ //
+ // Implemented by K.Oyama according to GEANT 3 parametrization shown in
+ // A.Andronic's webpage: http://www-alice.gsi.de/trd/papers/dedx/dedx.html
+ // This must be used as a set with IntSpecGeant.
+ //
+
+ Double_t arr_g[20] = {
+ 1.100000, 1.200000, 1.300000, 1.500000,
+ 1.800000, 2.000000, 2.500000, 3.000000,
+ 4.000000, 7.000000, 10.000000, 20.000000,
+ 40.000000, 70.000000, 100.000000, 300.000000,
+ 600.000000, 1000.000000, 3000.000000, 10000.000000 };
+
+ Double_t arr_nc[20] = {
+ 75.009056, 45.508083, 35.299252, 27.116327,
+ 22.734999, 21.411915, 19.934095, 19.449375,
+ 19.344431, 20.185553, 21.027925, 22.912676,
+ 24.933352, 26.504053, 27.387468, 29.566597,
+ 30.353779, 30.787134, 31.129285, 31.157350 };
+
+ // betagamma to gamma
+ Double_t g = TMath::Sqrt( 1. + bg*bg );
+
+ // Find the index just before the point we need.
+ int i;
+ for( i = 0 ; i < 18 ; i++ )
+ if( arr_g[i] < g && arr_g[i+1] > g )
+ break;
+
+ // Simple interpolation.
+ Double_t pp = ((arr_nc[i+1] - arr_nc[i]) /
+ (arr_g[i+1]-arr_g[i])) * (g-arr_g[i]) + arr_nc[i];
+
+ return pp; //arr_nc[8];
+
+}
+
+//_____________________________________________________________________________
+void AliTRDv1::Stepping()
+{
+// Stepping info
+// ---
+
+ cout << "X(cm) "
+ << "Y(cm) "
+ << "Z(cm) "
+ << "KinE(MeV) "
+ << "dE(MeV) "
+ << "Step(cm) "
+ << "TrackL(cm) "
+ << "Volume "
+ << "Process "
+ << endl;
+
+ // Position
+ //
+ Double_t x, y, z;
+ gMC->TrackPosition(x, y, z);
+ cout << setw(8) << setprecision(3) << x << " "
+ << setw(8) << setprecision(3) << y << " "
+ << setw(8) << setprecision(3) << z << " ";
+
+ // Kinetic energy
+ //
+ Double_t px, py, pz, etot;
+ gMC->TrackMomentum(px, py, pz, etot);
+ Double_t ekin = etot - gMC->TrackMass();
+ cout << setw(9) << setprecision(4) << ekin*1e03 << " ";
+
+ // Energy deposit
+ //
+ cout << setw(9) << setprecision(4) << gMC->Edep()*1e03 << " ";
+
+ // Step length
+ //
+ cout << setw(8) << setprecision(3) << gMC->TrackStep() << " ";
+
+ // Track length
+ //
+ cout << setw(8) << setprecision(3) << gMC->TrackLength() << " ";
+
+ // Volume
+ //
+ if (gMC->CurrentVolName() != 0)
+ cout << setw(4) << gMC->CurrentVolName() << " ";
+ else
+ cout << setw(4) << "None" << " ";
+
+ // Process
+ //
+ TArrayI processes;
+ Int_t nofProcesses = gMC->StepProcesses(processes);
+ for(int ip=0;ip<nofProcesses; ip++)
+ cout << TMCProcessName[processes[ip]]<<" / ";
+
+ cout << endl;
+}
+
+
//_____________________________________________________________________________
Double_t Ermilova(Double_t *x, Double_t *)
{
return dnde;
}
+
+//_____________________________________________________________________________
+Double_t IntSpecGeant(Double_t *x, Double_t *)
+{
+ //
+ // Integrated spectrum from Geant3
+ //
+
+ const Int_t npts = 83;
+ Double_t arre[npts] = {
+ 2.421257, 2.483278, 2.534301, 2.592230,
+ 2.672067, 2.813299, 3.015059, 3.216819,
+ 3.418579, 3.620338, 3.868209, 3.920198,
+ 3.978284, 4.063923, 4.186264, 4.308605,
+ 4.430946, 4.553288, 4.724261, 4.837736,
+ 4.999842, 5.161949, 5.324056, 5.486163,
+ 5.679688, 5.752998, 5.857728, 5.962457,
+ 6.067185, 6.171914, 6.315653, 6.393674,
+ 6.471694, 6.539689, 6.597658, 6.655627,
+ 6.710957, 6.763648, 6.816338, 6.876198,
+ 6.943227, 7.010257, 7.106285, 7.252151,
+ 7.460531, 7.668911, 7.877290, 8.085670,
+ 8.302979, 8.353585, 8.413120, 8.483500,
+ 8.541030, 8.592857, 8.668865, 8.820485,
+ 9.037086, 9.253686, 9.470286, 9.686887,
+ 9.930838, 9.994655, 10.085822, 10.176990,
+ 10.268158, 10.359325, 10.503614, 10.627565,
+ 10.804637, 10.981709, 11.158781, 11.335854,
+ 11.593397, 11.781165, 12.049404, 12.317644,
+ 12.585884, 12.854123, 14.278421, 16.975889,
+ 20.829416, 24.682943, 28.536469
+ };
+ /*
+ Double_t arrdndx[npts] = {
+ 19.344431, 18.664679, 18.136106, 17.567745,
+ 16.836426, 15.677382, 14.281277, 13.140237,
+ 12.207677, 11.445510, 10.697049, 10.562296,
+ 10.414673, 10.182341, 9.775256, 9.172330,
+ 8.240271, 6.898587, 4.808303, 3.889751,
+ 3.345288, 3.093431, 2.897347, 2.692470,
+ 2.436222, 2.340029, 2.208579, 2.086489,
+ 1.975535, 1.876519, 1.759626, 1.705024,
+ 1.656374, 1.502638, 1.330566, 1.200697,
+ 1.101168, 1.019323, 0.943867, 0.851951,
+ 0.755229, 0.671576, 0.570675, 0.449672,
+ 0.326722, 0.244225, 0.188225, 0.149608,
+ 0.121529, 0.116289, 0.110636, 0.103490,
+ 0.096147, 0.089191, 0.079780, 0.063927,
+ 0.047642, 0.036341, 0.028250, 0.022285,
+ 0.017291, 0.016211, 0.014802, 0.013533,
+ 0.012388, 0.011352, 0.009803, 0.008537,
+ 0.007039, 0.005829, 0.004843, 0.004034,
+ 0.003101, 0.002564, 0.001956, 0.001494,
+ 0.001142, 0.000873, 0.000210, 0.000014,
+ 0.000000, 0.000000, 0.000000
+ };
+ */
+ // Differentiate
+ // dnde = (arrdndx[i-1] - arrdndx[i]) / (arre[i] - arre[i-1]);
+
+ Double_t arrdnde[npts] = {
+ 10.960000, 10.960000, 10.359500, 9.811340,
+ 9.1601500, 8.206670, 6.919630, 5.655430,
+ 4.6221300, 3.777610, 3.019560, 2.591950,
+ 2.5414600, 2.712920, 3.327460, 4.928240,
+ 7.6185300, 10.966700, 12.225800, 8.094750,
+ 3.3586900, 1.553650, 1.209600, 1.263840,
+ 1.3241100, 1.312140, 1.255130, 1.165770,
+ 1.0594500, 0.945450, 0.813231, 0.699837,
+ 0.6235580, 2.260990, 2.968350, 2.240320,
+ 1.7988300, 1.553300, 1.432070, 1.535520,
+ 1.4429900, 1.247990, 1.050750, 0.829549,
+ 0.5900280, 0.395897, 0.268741, 0.185320,
+ 0.1292120, 0.103545, 0.0949525, 0.101535,
+ 0.1276380, 0.134216, 0.123816, 0.104557,
+ 0.0751843, 0.0521745, 0.0373546, 0.0275391,
+ 0.0204713, 0.0169234, 0.0154552, 0.0139194,
+ 0.0125592, 0.0113638, 0.0107354, 0.0102137,
+ 0.00845984, 0.00683338, 0.00556836, 0.00456874,
+ 0.0036227, 0.00285991, 0.00226664, 0.00172234,
+ 0.00131226, 0.00100284, 0.000465492, 7.26607e-05,
+ 3.63304e-06, 0.0000000, 0.0000000
+ };
+
+ Int_t i;
+ Double_t energy = x[0];
+
+ for( i = 0 ; i < npts ; i++ )
+ if( energy < arre[i] ) break;
+
+ if( i == 0 )
+ AliErrorGeneral("AliTRDv1","Given energy value is too small or zero");
+
+ return arrdnde[i];
+
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff