#include <stdlib.h>
-#include <TF1.h>
#include <TLorentzVector.h>
#include <TMath.h>
#include <TRandom.h>
#include <TVector.h>
#include <TVirtualMC.h>
#include <TGeoManager.h>
+#include <TGeoMatrix.h>
+#include <TGeoPhysicalNode.h>
#include "AliConst.h"
#include "AliLog.h"
+#include "AliTrackReference.h"
#include "AliMC.h"
#include "AliRun.h"
+#include "AliGeomManager.h"
#include "AliTRDgeometry.h"
+#include "AliTRDCommonParam.h"
#include "AliTRDhit.h"
-#include "AliTRDsim.h"
+#include "AliTRDsimTR.h"
#include "AliTRDv1.h"
ClassImp(AliTRDv1)
:AliTRD()
,fTRon(kFALSE)
,fTR(NULL)
- ,fTypeOfStepManager(0)
,fStepSize(0)
- ,fDeltaE(NULL)
- ,fDeltaG(NULL)
- ,fTrackLength0(0)
- ,fPrimaryTrackPid(0)
+ ,fWion(0)
{
//
// Default constructor
:AliTRD(name,title)
,fTRon(kTRUE)
,fTR(NULL)
- ,fTypeOfStepManager(2)
,fStepSize(0.1)
- ,fDeltaE(NULL)
- ,fDeltaG(NULL)
- ,fTrackLength0(0)
- ,fPrimaryTrackPid(0)
+ ,fWion(0)
{
//
// Standard constructor for Transition Radiation Detector version 1
SetBufferSize(128000);
-}
-
-//_____________________________________________________________________________
-AliTRDv1::AliTRDv1(const AliTRDv1 &trd)
- :AliTRD(trd)
- ,fTRon(trd.fTRon)
- ,fTR(NULL)
- ,fTypeOfStepManager(trd.fTypeOfStepManager)
- ,fStepSize(trd.fStepSize)
- ,fDeltaE(NULL)
- ,fDeltaG(NULL)
- ,fTrackLength0(trd.fTrackLength0)
- ,fPrimaryTrackPid(trd.fPrimaryTrackPid)
-{
- //
- // Copy constructor
- //
-
- fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE);
- fDeltaG->Copy(*((AliTRDv1 &) trd).fDeltaG);
- fTR->Copy(*((AliTRDv1 &) trd).fTR);
+ if (AliTRDCommonParam::Instance()->IsXenon()) {
+ fWion = 23.53; // Ionization energy XeCO2 (85/15)
+ }
+ else if (AliTRDCommonParam::Instance()->IsArgon()) {
+ fWion = 27.21; // Ionization energy ArCO2 (82/18)
+ }
+ else {
+ AliFatal("Wrong gas mixture");
+ exit(1);
+ }
}
// AliTRDv1 destructor
//
- if (fDeltaE) {
- delete fDeltaE;
- fDeltaE = 0;
- }
-
- if (fDeltaG) {
- delete fDeltaG;
- fDeltaG = 0;
- }
-
if (fTR) {
delete fTR;
fTR = 0;
}
-//_____________________________________________________________________________
-AliTRDv1 &AliTRDv1::operator=(const AliTRDv1 &trd)
-{
- //
- // Assignment operator
- //
-
- if (this != &trd) ((AliTRDv1 &) trd).Copy(*this);
-
- return *this;
-
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::Copy(TObject &trd) const
-{
- //
- // Copy function
- //
-
- ((AliTRDv1 &) trd).fTypeOfStepManager = fTypeOfStepManager;
- ((AliTRDv1 &) trd).fStepSize = fStepSize;
- ((AliTRDv1 &) trd).fTRon = fTRon;
- ((AliTRDv1 &) trd).fTrackLength0 = fTrackLength0;
- ((AliTRDv1 &) trd).fPrimaryTrackPid = fPrimaryTrackPid;
-
- fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE);
- fDeltaG->Copy(*((AliTRDv1 &) trd).fDeltaG);
- fTR->Copy(*((AliTRDv1 &) trd).fTR);
-
-}
-
//_____________________________________________________________________________
void AliTRDv1::AddAlignableVolumes() const
{
TString volPath;
TString symName;
- TString vpStr = "ALIC_1/B077_1/BSEGMO";
- TString vpApp1 = "_1/BTRD";
- TString vpApp2 = "_1";
- TString vpApp3 = "/UTR1_1/UTS1_1/UTI1_1/UT";
+ TString vpStr = "ALIC_1/B077_1/BSEGMO";
+ TString vpApp1 = "_1/BTRD";
+ TString vpApp2 = "_1";
+ TString vpApp3a = "/UTR1_1/UTS1_1/UTI1_1/UT";
+ TString vpApp3b = "/UTR2_1/UTS2_1/UTI2_1/UT";
+ TString vpApp3c = "/UTR3_1/UTS3_1/UTI3_1/UT";
- TString snStr = "TRD/sm";
- TString snApp1 = "/st";
- TString snApp2 = "/pl";
+ TString snStr = "TRD/sm";
+ TString snApp1 = "/st";
+ TString snApp2 = "/pl";
//
// The super modules
// ...
// TRD/sm17
//
- for (Int_t isect = 0; isect < AliTRDgeometry::Nsect(); isect++) {
+ for (Int_t isector = 0; isector < AliTRDgeometry::Nsector(); isector++) {
volPath = vpStr;
- volPath += isect;
+ volPath += isector;
volPath += vpApp1;
- volPath += isect;
+ volPath += isector;
volPath += vpApp2;
symName = snStr;
- symName += Form("%02d",isect);
+ symName += Form("%02d",isector);
gGeoManager->SetAlignableEntry(symName.Data(),volPath.Data());
// ...
// TRD/sm17/st4/pl5
//
- for (Int_t isect = 0; isect < AliTRDgeometry::Nsect(); isect++) {
- for (Int_t icham = 0; icham < AliTRDgeometry::Ncham(); icham++) {
- for (Int_t iplan = 0; iplan < AliTRDgeometry::Nplan(); iplan++) {
+ AliGeomManager::ELayerID idTRD1 = AliGeomManager::kTRD1;
+ Int_t layer, modUID;
+
+ for (Int_t isector = 0; isector < AliTRDgeometry::Nsector(); isector++) {
+
+ if (fGeometry->GetSMstatus(isector) == 0) continue;
+
+ for (Int_t istack = 0; istack < AliTRDgeometry::Nstack(); istack++) {
+ for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
- Int_t idet = AliTRDgeometry::GetDetectorSec(iplan,icham);
+ layer = idTRD1 + ilayer;
+ modUID = AliGeomManager::LayerToVolUIDSafe(layer,isector*5+istack);
+
+ Int_t idet = AliTRDgeometry::GetDetectorSec(ilayer,istack);
volPath = vpStr;
- volPath += isect;
+ volPath += isector;
volPath += vpApp1;
- volPath += isect;
+ volPath += isector;
volPath += vpApp2;
- volPath += vpApp3;
+ switch (isector) {
+ case 13:
+ case 14:
+ case 15:
+ if (istack == 2) {
+ continue;
+ }
+ volPath += vpApp3c;
+ break;
+ case 11:
+ case 12:
+ volPath += vpApp3b;
+ break;
+ default:
+ volPath += vpApp3a;
+ };
volPath += Form("%02d",idet);
volPath += vpApp2;
symName = snStr;
- symName += Form("%02d",isect);
+ symName += Form("%02d",isector);
symName += snApp1;
- symName += icham;
+ symName += istack;
symName += snApp2;
- symName += iplan;
-
- gGeoManager->SetAlignableEntry(symName.Data(),volPath.Data());
+ symName += ilayer;
+
+ TGeoPNEntry *alignableEntry =
+ gGeoManager->SetAlignableEntry(symName.Data(),volPath.Data(),modUID);
+
+ // Add the tracking to local matrix following the TPC example
+ if (alignableEntry) {
+ TGeoHMatrix *globMatrix = alignableEntry->GetGlobalOrig();
+ Double_t sectorAngle = 20.0 * (isector % 18) + 10.0;
+ TGeoHMatrix *t2lMatrix = new TGeoHMatrix();
+ t2lMatrix->RotateZ(sectorAngle);
+ t2lMatrix->MultiplyLeft(&(globMatrix->Inverse()));
+ alignableEntry->SetMatrix(t2lMatrix);
+ }
+ else {
+ AliError(Form("Alignable entry %s is not valid!",symName.Data()));
+ }
}
}
// volume.
//
- // PDG code electron
- const Int_t kPdgElectron = 11;
-
- // Ionization energy
- const Float_t kWion = 23.53;
-
// Maximum number of TR photons per track
const Int_t kNTR = 50;
TLorentzVector mom;
TLorentzVector pos;
- // Create TR at the entrance of the chamber
- if (gMC->IsTrackEntering()) {
+ Float_t eTR[kNTR];
+ Int_t nTR;
- // Create TR only for electrons
- Int_t iPdg = gMC->TrackPid();
- if (TMath::Abs(iPdg) != kPdgElectron) {
- return;
- }
+ // Create TR photons
+ gMC->TrackMomentum(mom);
+ Float_t pTot = mom.Rho();
+ fTR->CreatePhotons(11,pTot,nTR,eTR);
+ if (nTR > kNTR) {
+ AliFatal(Form("Boundary error: nTR = %d, kNTR = %d",nTR,kNTR));
+ }
- Float_t eTR[kNTR];
- Int_t nTR;
+ // Loop through the TR photons
+ for (Int_t iTR = 0; iTR < nTR; iTR++) {
- // Create TR photons
- gMC->TrackMomentum(mom);
- Float_t pTot = mom.Rho();
- fTR->CreatePhotons(iPdg,pTot,nTR,eTR);
- if (nTR > kNTR) {
- AliFatal(Form("Boundary error: nTR = %d, kNTR = %d",nTR,kNTR));
- }
+ Float_t energyMeV = eTR[iTR] * 0.001;
+ Float_t energyeV = eTR[iTR] * 1000.0;
+ Float_t absLength = 0.0;
+ Float_t sigma = 0.0;
- // 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 = 0.0;
- Float_t sigma = 0.0;
-
- // Take the absorbtion in the entrance window into account
- Double_t muMy = fTR->GetMuMy(energyMeV);
- sigma = muMy * fFoilDensity;
- if (sigma > 0.0) {
- absLength = gRandom->Exp(1.0/sigma);
- if (absLength < AliTRDgeometry::MyThick()) {
- continue;
- }
- }
- else {
+ // Take the absorbtion in the entrance window into account
+ Double_t muMy = fTR->GetMuMy(energyMeV);
+ sigma = muMy * fFoilDensity;
+ if (sigma > 0.0) {
+ absLength = gRandom->Exp(1.0/sigma);
+ if (absLength < AliTRDgeometry::MyThick()) {
continue;
}
+ }
+ else {
+ 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.
- if (sigma > 0.0) {
- absLength = gRandom->Exp(1.0/sigma);
- if (absLength > (AliTRDgeometry::DrThick()
- + AliTRDgeometry::AmThick())) {
- continue;
- }
- }
- else {
+ // The absorbtion cross sections in the drift gas
+ // Gas-mixture (Xe/CO2)
+ Double_t muNo = 0.0;
+ if (AliTRDCommonParam::Instance()->IsXenon()) {
+ muNo = fTR->GetMuXe(energyMeV);
+ }
+ else if (AliTRDCommonParam::Instance()->IsArgon()) {
+ muNo = fTR->GetMuAr(energyMeV);
+ }
+ Double_t muCO = fTR->GetMuCO(energyMeV);
+ sigma = (fGasNobleFraction * muNo + (1.0 - fGasNobleFraction) * muCO)
+ * fGasDensity
+ * fTR->GetTemp();
+
+ // The distance after which the energy of the TR photon
+ // is deposited.
+ if (sigma > 0.0) {
+ absLength = gRandom->Exp(1.0/sigma);
+ if (absLength > (AliTRDgeometry::DrThick()
+ + AliTRDgeometry::AmThick())) {
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
- AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber()
- ,det
- ,posHit
- ,-q
- ,kTRUE);
-
+ }
+ 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;
+
+ // Create the charge
+ Int_t q = ((Int_t) (energyeV / fWion));
+
+ // Add the hit to the array. TR photon hits are marked
+ // by negative charge
+ AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber()
+ ,det
+ ,posHit
+ ,-q
+ ,gMC->TrackTime()*1.0e06
+ ,kTRUE);
+
}
}
AliInfo("TR simulation off");
}
else {
- fTR = new AliTRDsim();
+ fTR = new AliTRDsimTR();
}
- // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2)
- const Float_t kPoti = 12.1;
- // Maximum energy (50 keV);
- const Float_t kEend = 50000.0;
- // Ermilova distribution for the delta-ray spectrum
- Float_t poti = TMath::Log(kPoti);
- Float_t eEnd = TMath::Log(kEend);
-
- // Ermilova distribution for the delta-ray spectrum
- fDeltaE = new TF1("deltae" ,Ermilova ,poti,eEnd,0);
-
- // Geant3 distribution for the delta-ray spectrum
- fDeltaG = new TF1("deltag",IntSpecGeant,2.421257,28.536469,0);
-
AliDebug(1,"+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
}
//_____________________________________________________________________________
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;
- case 1:
- StepManagerGeant();
- break;
- case 2:
- StepManagerFixedStep();
- break;
- 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
- //
-
- 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.
- //
- // Version by A. Bercuci
- //
-
- 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;
- Double_t 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;
- TLorentzVector mom;
-
- TArrayI processes;
-
- 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_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 !
- // [0.85*0.00549+0.15*0.00186 (Xe-CO2 85-15)]
- const Float_t kRho = 0.004945 ;
-
- // Plateau value of the energy-loss for electron in xenon
- // 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 = 19.34;
- // 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;
-
- // 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->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 < 90.0) {
- phi = phi + 270.0;
- }
- else {
- phi = phi - 90.0;
- }
- sec = ((Int_t) (phi / 20.0));
-
- // 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;
-
- // 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
- gMC->StepProcesses(processes);
- 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 prRange = 0.0;
- Float_t range = gMC->TrackLength() - fTrackLength0;
- // merge GEANT tracker information with locally cooked one
- if (gAlice->GetMCApp()->GetCurrentTrackNumber() == fPrimaryTrackPid) {
- if (pid == 27) {
- if (eDelta >= kECut) {
- prRange = kRa * eDelta * 0.001
- * (1.0 - kRb / (1.0 + kRc * eDelta * 0.001)) / kRho;
- if (prRange >= (3.7 - range)) {
- eDelta *= 0.1;
- }
- }
- }
- else if (pid == 1) {
- if (eDelta < kECut) {
- eDelta *= 0.5;
- }
- else {
- prRange = kRa * eDelta * 0.001
- * (1.0 - kRb / (1.0 + kRc * eDelta * 0.001)) / kRho;
- if (prRange >= ((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 == 0.0) {
- 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 = 1.0 / nsteps;
- gMC->SetMaxStep(stepSize);
-
- }
-
- }
-
- }
-
- }
-
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::StepManagerErmilova()
-{
- //
- // 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 Ermilova et al.
- //
-
- 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];
- Double_t random[1];
- Float_t charge;
- Float_t aMass;
-
- Double_t pTot = 0.0;
- Double_t eDelta;
- Double_t betaGamma;
- Double_t 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;
- TLorentzVector 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;
-
- // Plateau value of the energy-loss for electron in xenon
- // 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;
- // 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;
-
- // 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->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 < 90.0) {
- phi = phi + 270.0;
- }
- else {
- phi = phi - 90.0;
- }
- sec = ((Int_t) (phi / 20.0));
-
- // 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;
-
- // 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());
- }
- // 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);
- // Generate the electron cluster size
- if (eDelta == 0.0) {
- 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 {
- 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
- 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 = kPrim * BetheBloch(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;
- }
-
- if (pp > 0.0) {
- do {
- gMC->GetRandom()->RndmArray(1,random);
- }
- while ((random[0] == 1.0) ||
- (random[0] == 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.
//
+ // Works for Xe/CO2 as well as Ar/CO2
+ //
- Int_t pla = 0;
- Int_t cha = 0;
- Int_t sec = 0;
- Int_t det = 0;
+ // PDG code electron
+ const Int_t kPdgElectron = 11;
+
+ Int_t layer = 0;
+ Int_t stack = 0;
+ Int_t sector = 0;
+ Int_t det = 0;
Int_t qTot;
Float_t hits[3];
Bool_t drRegion = kFALSE;
Bool_t amRegion = kFALSE;
+ TString cIdPath;
+ Char_t cIdSector[3];
+ cIdSector[2] = 0;
+
TString cIdCurrent;
TString cIdSensDr = "J";
TString cIdSensAm = "K";
Char_t cIdChamber[3];
- cIdChamber[2] = 0;
+ cIdChamber[2] = 0;
TLorentzVector pos;
TLorentzVector mom;
- const Int_t kNplan = AliTRDgeometry::Nplan();
- const Int_t kNcham = AliTRDgeometry::Ncham();
- const Int_t kNdetsec = kNplan * kNcham;
+ const Int_t kNlayer = AliTRDgeometry::Nlayer();
+ const Int_t kNstack = AliTRDgeometry::Nstack();
+ const Int_t kNdetsec = kNlayer * kNstack;
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
// If not charged track or already stopped or disappeared, just return.
if ((!gMC->TrackCharge()) ||
- gMC->IsTrackDisappeared()) return;
+ gMC->IsTrackDisappeared()) {
+ return;
+ }
// Inside a sensitive volume?
cIdCurrent = gMC->CurrentVolName();
- if (cIdSensDr == cIdCurrent[1]) drRegion = kTRUE;
- if (cIdSensAm == cIdCurrent[1]) amRegion = kTRUE;
+ if (cIdSensDr == cIdCurrent[1]) {
+ drRegion = kTRUE;
+ }
+ if (cIdSensAm == cIdCurrent[1]) {
+ amRegion = kTRUE;
+ }
if ((!drRegion) &&
(!amRegion)) {
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 < 90.0) {
- phi = phi + 270.0;
- }
- else {
- phi = phi - 90.0;
- }
- sec = ((Int_t) (phi / 20.0));
+ // The sector number (0 - 17), according to standard coordinate system
+ cIdPath = gGeoManager->GetPath();
+ cIdSector[0] = cIdPath[21];
+ cIdSector[1] = cIdPath[22];
+ sector = atoi(cIdSector);
// 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 (!addthishit) {
- return;
- }
+ stack = ((Int_t) idChamber / kNlayer);
+ layer = ((Int_t) idChamber % kNlayer);
// The detector number
- det = fGeometry->GetDetector(pla,cha,sec);
+ det = fGeometry->GetDetector(layer,stack,sector);
// 0: InFlight 1:Entering 2:Exiting
Int_t trkStat = 0;
// 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 ((drRegion) &&
+ (gMC->IsTrackEntering())) {
- 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 a track reference at the entrance of each
+ // chamber that contains the momentum components of the particle
+ gMC->TrackMomentum(mom);
+ AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kTRD);
+ trkStat = 1;
+
+ // Create the hits from TR photons if electron/positron is
+ // entering the drift volume
+ if ((fTR) &&
+ (TMath::Abs(gMC->TrackPid()) == kPdgElectron)) {
+ CreateTRhit(det);
}
- // Create the hits from TR photons
- if (fTR) {
- CreateTRhit(det);
- }
+ }
+ else if ((amRegion) &&
+ (gMC->IsTrackExiting())) {
+
+ // Create a track reference at the exit of each
+ // chamber that contains the momentum components of the particle
+ gMC->TrackMomentum(mom);
+ AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kTRD);
+ trkStat = 2;
}
// 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);
+ qTot = (Int_t) (eDep / fWion);
+ if ((qTot) ||
+ (trkStat)) {
+ AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber()
+ ,det
+ ,hits
+ ,qTot
+ ,gMC->TrackTime()*1.0e06
+ ,drRegion);
+ }
// Set Maximum Step Size
// Produce only one hit if Ekin is below cutoff
gMC->SetMaxStep(fStepSize);
}
-
-//_____________________________________________________________________________
-Double_t AliTRDv1::BetheBloch(Double_t bg)
-{
- //
- // Parametrization of the Bethe-Bloch-curve
- // The parametrization is the same as for the TPC and is taken from Lehrhaus.
- //
-
- // This parameters have been adjusted to averaged values from GEANT
- const Double_t kP1 = 7.17960e-02;
- const Double_t kP2 = 8.54196;
- const Double_t kP3 = 1.38065e-06;
- const Double_t kP4 = 5.30972;
- const Double_t kP5 = 2.83798;
-
- // Lower cutoff of the Bethe-Bloch-curve to limit step sizes
- const Double_t kBgMin = 0.8;
- const Double_t kBBMax = 6.83298;
-
- if (bg > kBgMin) {
- Double_t yy = bg / TMath::Sqrt(1.0 + bg*bg);
- Double_t aa = TMath::Power(yy,kP4);
- Double_t bb = TMath::Power((1.0/bg),kP5);
- bb = TMath::Log(kP3 + bb);
- return ((kP2 - aa - bb) * kP1 / aa);
- }
- else {
- return kBBMax;
- }
-
-}
-
-//_____________________________________________________________________________
-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.
- //
-
- Int_t i = 0;
-
- Double_t arrG[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 arrNC[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(1.0 + bg*bg);
-
- // Find the index just before the point we need.
- for (i = 0; i < 18; i++) {
- if ((arrG[i] < g) &&
- (arrG[i+1] > g)) {
- break;
- }
- }
-
- // Simple interpolation.
- Double_t pp = ((arrNC[i+1] - arrNC[i]) / (arrG[i+1] - arrG[i]))
- * (g - arrG[i]) + arrNC[i];
-
- return pp;
-
-}
-
-//_____________________________________________________________________________
-Double_t Ermilova(Double_t *x, Double_t *)
-{
- //
- // Calculates the delta-ray energy distribution according to Ermilova.
- // Logarithmic scale !
- //
-
- Double_t energy;
- Double_t dpos;
- Double_t dnde;
-
- Int_t pos1;
- Int_t pos2;
-
- const Int_t kNv = 31;
-
- Float_t vxe[kNv] = { 2.3026, 2.9957, 3.4012, 3.6889, 3.9120
- , 4.0943, 4.2485, 4.3820, 4.4998, 4.6052
- , 4.7005, 5.0752, 5.2983, 5.7038, 5.9915
- , 6.2146, 6.5221, 6.9078, 7.3132, 7.6009
- , 8.0064, 8.5172, 8.6995, 8.9872, 9.2103
- , 9.4727, 9.9035, 10.3735, 10.5966, 10.8198
- , 11.5129 };
-
- Float_t vye[kNv] = { 80.0, 31.0, 23.3, 21.1, 21.0
- , 20.9, 20.8, 20.0, 16.0, 11.0
- , 8.0, 6.0, 5.2, 4.6, 4.0
- , 3.5, 3.0, 1.4, 0.67, 0.44
- , 0.3, 0.18, 0.12, 0.08, 0.056
- , 0.04, 0.023, 0.015, 0.011, 0.01
- , 0.004 };
-
- energy = x[0];
-
- // Find the position
- pos1 = 0;
- pos2 = 0;
- dpos = 0;
- do {
- dpos = energy - vxe[pos2++];
- }
- while (dpos > 0);
- pos2--;
- if (pos2 > kNv) {
- pos2 = kNv - 1;
- }
- pos1 = pos2 - 1;
-
- // Differentiate between the sampling points
- dnde = (vye[pos1] - vye[pos2]) / (vxe[pos2] - vxe[pos1]);
-
- 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 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::IntSpecGeant","Given energy value is too small or zero");
- }
-
- return arrdnde[i];
-
-}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff