/* $Id$ */
-///////////////////////////////////////////////////////////////////////////////
-// //
-// Transition Radiation Detector version 1 -- slow simulator //
-// //
-//Begin_Html
-/*
-<img src="picts/AliTRDfullClass.gif">
-*/
-//End_Html
-// //
-// //
-///////////////////////////////////////////////////////////////////////////////
-
-#include <stdlib.h>
-
-#include <TF1.h>
+////////////////////////////////////////////////////////////////////////////
+// //
+// Transition Radiation Detector version 1 -- slow simulator //
+// //
+////////////////////////////////////////////////////////////////////////////
+
#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 "AliTrackReference.h"
+#include "AliMC.h"
#include "AliRun.h"
+#include "AliGeomManager.h"
+
#include "AliTRDgeometry.h"
-#include "AliTRDhit.h"
-#include "AliTRDmatrix.h"
-#include "AliTRDsim.h"
+#include "AliTRDCommonParam.h"
+#include "AliTRDsimTR.h"
#include "AliTRDv1.h"
ClassImp(AliTRDv1)
//_____________________________________________________________________________
-AliTRDv1::AliTRDv1():AliTRD()
+AliTRDv1::AliTRDv1()
+ :AliTRD()
+ ,fTRon(kTRUE)
+ ,fTR(NULL)
+ ,fStepSize(0)
+ ,fWion(0)
{
//
// Default constructor
//
- fSensSelect = 0;
- fSensPlane = -1;
- fSensChamber = -1;
- fSensSector = -1;
- fSensSectorRange = 0;
-
- fDeltaE = NULL;
- fTR = NULL;
-
}
//_____________________________________________________________________________
AliTRDv1::AliTRDv1(const char *name, const char *title)
- :AliTRD(name, title)
+ :AliTRD(name,title)
+ ,fTRon(kTRUE)
+ ,fTR(NULL)
+ ,fStepSize(0.1)
+ ,fWion(0)
{
//
// Standard constructor for Transition Radiation Detector version 1
//
- fSensSelect = 0;
- fSensPlane = -1;
- fSensChamber = -1;
- fSensSector = -1;
- fSensSectorRange = 0;
-
- fDeltaE = NULL;
- fTR = NULL;
-
SetBufferSize(128000);
-}
-
-//_____________________________________________________________________________
-AliTRDv1::AliTRDv1(const AliTRDv1 &trd)
-{
- //
- // Copy constructor
- //
-
- ((AliTRDv1 &) trd).Copy(*this);
+ 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;
- if (fTR) delete fTR;
+ if (fTR) {
+ delete fTR;
+ fTR = 0;
+ }
}
//_____________________________________________________________________________
-AliTRDv1 &AliTRDv1::operator=(const AliTRDv1 &trd)
+void AliTRDv1::AddAlignableVolumes() const
{
//
- // Assignment operator
+ // Create entries for alignable volumes associating the symbolic volume
+ // name with the corresponding volume path. Needs to be syncronized with
+ // eventual changes in the geometry.
//
- if (this != &trd) ((AliTRDv1 &) trd).Copy(*this);
- return *this;
+ TString volPath;
+ TString symName;
+
+ 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";
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::Copy(TObject &trd)
-{
//
- // Copy function
+ // The super modules
+ // The symbolic names are: TRD/sm00
+ // ...
+ // TRD/sm17
//
+ for (Int_t isector = 0; isector < AliTRDgeometry::Nsector(); isector++) {
+
+ volPath = vpStr;
+ volPath += isector;
+ volPath += vpApp1;
+ volPath += isector;
+ volPath += vpApp2;
+
+ symName = snStr;
+ symName += Form("%02d",isector);
+
+ gGeoManager->SetAlignableEntry(symName.Data(),volPath.Data());
+
+ }
+
+ //
+ // The readout chambers
+ // The symbolic names are: TRD/sm00/st0/pl0
+ // ...
+ // TRD/sm17/st4/pl5
+ //
+ AliGeomManager::ELayerID idTRD1 = AliGeomManager::kTRD1;
+ Int_t layer, modUID;
+
+ for (Int_t isector = 0; isector < AliTRDgeometry::Nsector(); isector++) {
+
+ if (fGeometry->GetSMstatus(isector) == 0) continue;
- ((AliTRDv1 &) trd).fSensSelect = fSensSelect;
- ((AliTRDv1 &) trd).fSensPlane = fSensPlane;
- ((AliTRDv1 &) trd).fSensChamber = fSensChamber;
- ((AliTRDv1 &) trd).fSensSector = fSensSector;
- ((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange;
+ for (Int_t istack = 0; istack < AliTRDgeometry::Nstack(); istack++) {
+ for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
- fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE);
- fTR->Copy(*((AliTRDv1 &) trd).fTR);
+ layer = idTRD1 + ilayer;
+ modUID = AliGeomManager::LayerToVolUIDSafe(layer,isector*5+istack);
+
+ Int_t idet = AliTRDgeometry::GetDetectorSec(ilayer,istack);
+
+ volPath = vpStr;
+ volPath += isector;
+ volPath += vpApp1;
+ volPath += isector;
+ volPath += vpApp2;
+ 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",isector);
+ symName += snApp1;
+ symName += istack;
+ symName += snApp2;
+ 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()));
+ }
+
+ }
+ }
+ }
}
// Check that FRAME is there otherwise we have no place where to put the TRD
AliModule* frame = gAlice->GetModule("FRAME");
- if (!frame) return;
+ if (!frame) {
+ AliError("TRD needs FRAME to be present\n");
+ return;
+ }
// Define the chambers
AliTRD::CreateGeometry();
// 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;
-
- // Create TR at the entrance of the chamber
- if (gMC->IsTrackEntering()) {
+ TLorentzVector mom;
+ TLorentzVector pos;
- // Create TR only for electrons
- Int_t iPdg = gMC->TrackPid();
- if (TMath::Abs(iPdg) != kPdgElectron) return;
+ Float_t eTR[kNTR];
+ Int_t nTR;
- 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);
- }
+ // 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));
+ }
- // Loop through the TR photons
- for (Int_t iTR = 0; iTR < nTR; iTR++) {
+ // 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;
+ 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
- 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 * fTR->GetTemp();
- }
- 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 * 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()) 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->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);
}
AliTRD::Init();
- if(fDebug) printf("%s: Slow simulator\n",ClassName());
- if (fSensSelect) {
- if (fSensPlane >= 0)
- printf(" Only plane %d is sensitive\n",fSensPlane);
- if (fSensChamber >= 0)
- printf(" Only chamber %d is sensitive\n",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);
- }
- }
- if (fTR)
- printf("%s: TR simulation on\n",ClassName());
- else
- printf("%s: TR simulation off\n",ClassName());
- printf("\n");
-
- // 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);
- fDeltaE = new TF1("deltae",Ermilova,poti,eEnd,0);
-
- if(fDebug) {
- printf("%s: ",ClassName());
- for (Int_t i = 0; i < 80; i++) printf("*");
- printf("\n");
- }
-
-}
-
-//_____________________________________________________________________________
-AliTRDsim *AliTRDv1::CreateTR()
-{
- //
- // Enables the simulation of TR
- //
-
- fTR = new AliTRDsim();
- return fTR;
-
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::SetSensPlane(Int_t iplane)
-{
- //
- // Defines the hit-sensitive plane (0-5)
- //
-
- if ((iplane < 0) || (iplane > 5)) {
- printf("Wrong input value: %d\n",iplane);
- printf("Use standard setting\n");
- fSensPlane = -1;
- fSensSelect = 0;
- return;
- }
-
- fSensSelect = 1;
- fSensPlane = iplane;
-
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::SetSensChamber(Int_t ichamber)
-{
- //
- // Defines the hit-sensitive chamber (0-4)
- //
+ AliDebug(1,"Slow simulator\n");
- if ((ichamber < 0) || (ichamber > 4)) {
- printf("Wrong input value: %d\n",ichamber);
- printf("Use standard setting\n");
- fSensChamber = -1;
- fSensSelect = 0;
- return;
+ // Switch on TR simulation as default
+ if (!fTRon) {
+ AliInfo("TR simulation off");
}
-
- fSensSelect = 1;
- fSensChamber = ichamber;
-
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::SetSensSector(Int_t isector)
-{
- //
- // Defines the hit-sensitive sector (0-17)
- //
-
- SetSensSector(isector,1);
-
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::SetSensSector(Int_t isector, Int_t nsector)
-{
- //
- // Defines a range of hit-sensitive sectors. The range is defined by
- // <isector> (0-17) as the starting point and <nsector> as the number
- // of sectors to be included.
- //
-
- if ((isector < 0) || (isector > 17)) {
- printf("Wrong input value <isector>: %d\n",isector);
- printf("Use standard setting\n");
- fSensSector = -1;
- fSensSectorRange = 0;
- fSensSelect = 0;
- return;
- }
-
- if ((nsector < 1) || (nsector > 18)) {
- printf("Wrong input value <nsector>: %d\n",nsector);
- printf("Use standard setting\n");
- fSensSector = -1;
- fSensSectorRange = 0;
- fSensSelect = 0;
- return;
+ else {
+ fTR = new AliTRDsimTR();
}
- fSensSelect = 1;
- fSensSector = isector;
- fSensSectorRange = nsector;
+ AliDebug(1,"+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
}
{
//
// 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.
+ // 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;
- Int_t iPdg;
+ // 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];
- Double_t random[1];
- Float_t charge;
- Float_t aMass;
-
- Double_t pTot = 0;
- Double_t eDelta;
- Double_t betaGamma, pp;
- Double_t stepSize;
+ Double_t eDep;
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;
- 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;
-
- // 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;
- // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2)
- const Float_t kPoti = 12.1;
+ TLorentzVector pos;
+ TLorentzVector mom;
- // PDG code electron
- const Int_t kPdgElectron = 11;
+ 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 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);
-
- // 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 = ((Int_t) idChamber / kNplan);
- 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 and TR photons 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->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);
+ if (!fPrimaryIonisation) gMC->SetMaxStep(kBig);
- // Create a new dEdx hit
- if (drRegion) {
- AddHit(gAlice->GetCurrentTrackNumber(),det,hits,qTot,kTRUE);
- }
- else {
- AddHit(gAlice->GetCurrentTrackNumber(),det,hits,qTot,kFALSE);
- }
+ // If not charged track or already stopped or disappeared, just return.
+ if ((!gMC->TrackCharge()) ||
+ gMC->IsTrackDisappeared()) {
+ return;
+ }
- // 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;
- }
- // Electrons above 20 Mev/c are at the plateau
- else {
- pp = kPrim * kPlateau;
- }
-
- if (pp > 0) {
- do
- gMC->GetRandom()->RndmArray(1, random);
- while ((random[0] == 1.) || (random[0] == 0.));
- stepSize = - TMath::Log(random[0]) / pp;
- gMC->SetMaxStep(stepSize);
- }
+ // 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), 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);
+ stack = ((Int_t) idChamber / kNlayer);
+ layer = ((Int_t) idChamber % kNlayer);
+
+ // The detector number
+ 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) &&
+ (gMC->IsTrackEntering())) {
+
+ // 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) &&
+ (fTRon) &&
+ (TMath::Abs(gMC->TrackPid()) == kPdgElectron)) {
+ CreateTRhit(det);
}
}
+ else if ((amRegion) &&
+ (gMC->IsTrackExiting())) {
-}
-
-//_____________________________________________________________________________
-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.
- //
+ // 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;
- // 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;
-
- // This parameters have been adjusted to Xe-data found in:
- // Allison & Cobb, Ann. Rev. Nucl. Sci. (1980), 30, 253
- //const Double_t kP1 = 0.76176E-1;
- //const Double_t kP2 = 10.632;
- //const Double_t kP3 = 3.17983E-6;
- //const Double_t kP4 = 1.8631;
- //const Double_t kP5 = 1.9479;
-
- // Lower cutoff of the Bethe-Bloch-curve to limit step sizes
- const Double_t kBgMin = 0.8;
- const Double_t kBBMax = 6.83298;
- //const Double_t kBgMin = 0.6;
- //const Double_t kBBMax = 17.2809;
- //const Double_t kBgMin = 0.4;
- //const Double_t kBBMax = 82.0;
-
- if (bg > kBgMin) {
- Double_t yy = bg / TMath::Sqrt(1. + bg*bg);
- Double_t aa = TMath::Power(yy,kP4);
- Double_t bb = TMath::Power((1./bg),kP5);
- bb = TMath::Log(kP3 + bb);
- return ((kP2 - aa - bb)*kP1 / aa);
}
- else {
- return kBBMax;
+
+ // 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 / fWion);
+ if ((qTot) ||
+ (trkStat)) {
+ AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber()
+ ,det
+ ,hits
+ ,qTot
+ ,gMC->TrackTime()*1.0e06
+ ,drRegion);
}
-}
-
-//_____________________________________________________________________________
-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, 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 = 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;
+ // Set Maximum Step Size
+ // Produce only one hit if Ekin is below cutoff
+ if ((gMC->Etot() - gMC->TrackMass()) < kEkinMinStep) {
+ return;
+ }
+ if (!fPrimaryIonisation) gMC->SetMaxStep(fStepSize);
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff