/*
$Log$
+Revision 1.31 2002/02/11 14:25:27 cblume
+Geometry update, compressed hit structure
+
+Revision 1.30 2001/05/21 16:45:47 hristov
+Last minute changes (C.Blume)
+
+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
///////////////////////////////////////////////////////////////////////////////
// //
-// Transition Radiation Detector version 2 -- slow simulator //
+// Transition Radiation Detector version 1 -- slow simulator //
// //
//Begin_Html
/*
// //
///////////////////////////////////////////////////////////////////////////////
+#include <stdlib.h>
+
#include <TMath.h>
#include <TVector.h>
#include <TRandom.h>
+#include <TF1.h>
+#include <TLorentzVector.h>
-#include "AliTRDv1.h"
-#include "AliTRDmatrix.h"
#include "AliRun.h"
#include "AliMC.h"
#include "AliConst.h"
+#include "AliTRDv1.h"
+#include "AliTRDhit.h"
+#include "AliTRDmatrix.h"
+#include "AliTRDgeometry.h"
+#include "AliTRDsim.h"
+
ClassImp(AliTRDv1)
+
+//_____________________________________________________________________________
+AliTRDv1::AliTRDv1():AliTRD()
+{
+ //
+ // 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)
{
//
- // Standard constructor for Transition Radiation Detector version 2
+ // Standard constructor for Transition Radiation Detector version 1
//
- fIdSens = 0;
-
- fIdChamber1 = 0;
- fIdChamber2 = 0;
- fIdChamber3 = 0;
-
- fSensSelect = 0;
- fSensPlane = 0;
- fSensChamber = 0;
- fSensSector = 0;
+ fSensSelect = 0;
+ fSensPlane = -1;
+ fSensChamber = -1;
+ fSensSector = -1;
+ fSensSectorRange = 0;
- fGasGain = 0;
- fNoise = 0;
- fChipGain = 0;
- fADCoutRange = 0;
- fADCinRange = 0;
- fADCthreshold = 0;
+ fDeltaE = NULL;
+ fTR = NULL;
- fDiffusionT = 0;
- fDiffusionL = 0;
+ SetBufferSize(128000);
- fClusMaxThresh = 0;
- fClusSigThresh = 0;
- fClusMethod = 0;
+}
- fDeltaE = NULL;
+//_____________________________________________________________________________
+AliTRDv1::AliTRDv1(const AliTRDv1 &trd)
+{
+ //
+ // Copy constructor
+ //
- SetBufferSize(128000);
+ ((AliTRDv1 &) trd).Copy(*this);
}
//_____________________________________________________________________________
AliTRDv1::~AliTRDv1()
{
+ //
+ // AliTRDv1 destructor
+ //
if (fDeltaE) delete fDeltaE;
+ if (fTR) delete fTR;
+
+}
+
+//_____________________________________________________________________________
+AliTRDv1 &AliTRDv1::operator=(const AliTRDv1 &trd)
+{
+ //
+ // Assignment operator
+ //
+
+ if (this != &trd) ((AliTRDv1 &) trd).Copy(*this);
+ return *this;
}
+//_____________________________________________________________________________
+void AliTRDv1::Copy(TObject &trd)
+{
+ //
+ // Copy function
+ //
+
+ ((AliTRDv1 &) trd).fSensSelect = fSensSelect;
+ ((AliTRDv1 &) trd).fSensPlane = fSensPlane;
+ ((AliTRDv1 &) trd).fSensChamber = fSensChamber;
+ ((AliTRDv1 &) trd).fSensSector = fSensSector;
+ ((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange;
+
+ fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE);
+ fTR->Copy(*((AliTRDv1 &) trd).fTR);
+
+}
+
//_____________________________________________________________________________
void AliTRDv1::CreateGeometry()
{
//
- // Create the GEANT geometry for the Transition Radiation Detector - Version 2
+ // Create the GEANT geometry for the Transition Radiation Detector - Version 1
// This version covers the full azimuth.
//
// Check that FRAME is there otherwise we have no place where to put the TRD
- AliModule* FRAME = gAlice->GetModule("FRAME");
- if (!FRAME) return;
+ AliModule* frame = gAlice->GetModule("FRAME");
+ if (!frame) return;
// Define the chambers
AliTRD::CreateGeometry();
void AliTRDv1::CreateMaterials()
{
//
- // Create materials for the Transition Radiation Detector version 2
+ // Create materials for the Transition Radiation Detector version 1
//
AliTRD::CreateMaterials();
}
//_____________________________________________________________________________
-void AliTRDv1::Diffusion(Float_t driftlength, Float_t *xyz)
+void AliTRDv1::CreateTRhit(Int_t det)
{
//
- // Applies the diffusion smearing to the position of a single electron
+ // Creates an electron cluster from a TR photon.
+ // The photon is assumed to be created a the end of the radiator. The
+ // distance after which it deposits its energy takes into account the
+ // absorbtion of the entrance window and of the gas mixture in drift
+ // volume.
//
- if ((driftlength > 0) &&
- (driftlength < kDrThick)) {
- Float_t driftSqrt = TMath::Sqrt(driftlength);
- Float_t sigmaT = driftSqrt * fDiffusionT;
- Float_t sigmaL = driftSqrt * fDiffusionL;
- xyz[0] = gRandom->Gaus(xyz[0], sigmaL);
- xyz[1] = gRandom->Gaus(xyz[1], sigmaT);
- xyz[2] = gRandom->Gaus(xyz[2], sigmaT);
- }
- else {
- xyz[0] = 0.0;
- xyz[1] = 0.0;
- xyz[2] = 0.0;
- }
+ // PDG code electron
+ const Int_t kPdgElectron = 11;
-}
-
-//_____________________________________________________________________________
-void AliTRDv1::Hits2Digits()
-{
- //
- // Creates TRD digits from hits. This procedure includes the following:
- // - Diffusion
- // - Gas gain including fluctuations
- // - Pad-response (simple Gaussian approximation)
- // - Electronics noise
- // - Electronics gain
- // - Digitization
- // - ADC threshold
- // The corresponding parameter can be adjusted via the various Set-functions.
- // If these parameters are not explicitly set, default values are used (see
- // Init-function).
- // To produce digits from a root-file with TRD-hits use the
- // slowDigitsCreate.C macro.
- //
+ // Ionization energy
+ const Float_t kWion = 22.04;
- printf("AliTRDv1::Hits2Digits -- Start creating digits\n");
-
- ///////////////////////////////////////////////////////////////
- // Parameter
- ///////////////////////////////////////////////////////////////
-
- // Converts number of electrons to fC
- const Float_t el2fC = 1.602E-19 * 1.0E15;
-
- ///////////////////////////////////////////////////////////////
-
- Int_t nBytes = 0;
-
- Int_t iRow;
-
- AliTRDhit *TRDhit;
-
- // Get the pointer to the hit tree
- TTree *HitTree = gAlice->TreeH();
- // Get the pointer to the digits tree
- TTree *DigitsTree = gAlice->TreeD();
-
- // Get the number of entries in the hit tree
- // (Number of primary particles creating a hit somewhere)
- Int_t nTrack = (Int_t) HitTree->GetEntries();
-
- Int_t chamBeg = 0;
- Int_t chamEnd = kNcham;
- if (fSensChamber) chamEnd = chamBeg = fSensChamber;
- Int_t planBeg = 0;
- Int_t planEnd = kNplan;
- if (fSensPlane) planEnd = planBeg = fSensPlane;
- Int_t sectBeg = 0;
- Int_t sectEnd = kNsect;
- if (fSensSector) sectEnd = sectBeg = fSensSector;
-
- // Loop through all the chambers
- for (Int_t icham = chamBeg; icham < chamEnd; icham++) {
- for (Int_t iplan = planBeg; iplan < planEnd; iplan++) {
- for (Int_t isect = sectBeg; isect < sectEnd; isect++) {
-
- Int_t nDigits = 0;
-
- printf("AliTRDv1::Hits2Digits -- Digitizing chamber %d, plane %d, sector %d\n"
- ,icham+1,iplan+1,isect+1);
-
- // Create a detector matrix to keep the signal and track numbers
- AliTRDmatrix *matrix = new AliTRDmatrix(fRowMax[iplan][icham][isect]
- ,fColMax[iplan]
- ,fTimeMax
- ,isect+1,icham+1,iplan+1);
-
- // Loop through all entries in the tree
- for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
-
- gAlice->ResetHits();
- nBytes += HitTree->GetEvent(iTrack);
-
- // Get the number of hits in the TRD created by this particle
- Int_t nHit = fHits->GetEntriesFast();
-
- // Loop through the TRD hits
- for (Int_t iHit = 0; iHit < nHit; iHit++) {
-
- if (!(TRDhit = (AliTRDhit *) fHits->UncheckedAt(iHit)))
- continue;
-
- Float_t x = TRDhit->fX;
- Float_t y = TRDhit->fY;
- Float_t z = TRDhit->fZ;
- Float_t q = TRDhit->fQ;
- Int_t track = TRDhit->fTrack;
- Int_t plane = TRDhit->fPlane;
- Int_t sector = TRDhit->fSector;
- Int_t chamber = TRDhit->fChamber;
-
- if ((sector != isect+1) ||
- (plane != iplan+1) ||
- (chamber != icham+1))
- continue;
-
- // Rotate the sectors on top of each other
- Float_t phi = 2.0 * kPI / (Float_t) kNsect
- * ((Float_t) sector - 0.5);
- Float_t xRot = -x * TMath::Cos(phi) + y * TMath::Sin(phi);
- Float_t yRot = x * TMath::Sin(phi) + y * TMath::Cos(phi);
- Float_t zRot = z;
-
- // The hit position in pad coordinates (center pad)
- // The pad row (z-direction)
- Int_t rowH = (Int_t) ((zRot - fRow0[iplan][icham][isect]) / fRowPadSize);
- // The pad column (rphi-direction)
- Int_t colH = (Int_t) ((yRot - fCol0[iplan] ) / fColPadSize);
- // The time bucket
- Int_t timeH = (Int_t) ((xRot - fTime0[iplan] ) / fTimeBinSize);
-
- // Array to sum up the signal in a box surrounding the
- // hit postition
- const Int_t timeBox = 5;
- const Int_t colBox = 7;
- const Int_t rowBox = 5;
- Float_t signalSum[rowBox][colBox][timeBox];
- for (iRow = 0; iRow < rowBox; iRow++ ) {
- for (Int_t iCol = 0; iCol < colBox; iCol++ ) {
- for (Int_t iTime = 0; iTime < timeBox; iTime++) {
- signalSum[iRow][iCol][iTime] = 0;
- }
- }
- }
-
- // Loop over all electrons of this hit
- Int_t nEl = (Int_t) q;
- for (Int_t iEl = 0; iEl < nEl; iEl++) {
-
- // Apply the diffusion smearing
- Float_t driftlength = xRot - fTime0[iplan];
- Float_t xyz[3];
- xyz[0] = xRot;
- xyz[1] = yRot;
- xyz[2] = zRot;
- Diffusion(driftlength,xyz);
-
- // At this point absorption effects that depend on the
- // driftlength could be taken into account.
-
- // The electron position and the distance to the hit position
- // in pad units
- // The pad row (z-direction)
- Int_t rowE = (Int_t) ((xyz[2] - fRow0[iplan][icham][isect]) / fRowPadSize);
- Int_t rowD = rowH - rowE;
- // The pad column (rphi-direction)
- Int_t colE = (Int_t) ((xyz[1] - fCol0[iplan] ) / fColPadSize);
- Int_t colD = colH - colE;
- // The time bucket
- Int_t timeE = (Int_t) ((xyz[0] - fTime0[iplan] ) / fTimeBinSize);
- Int_t timeD = timeH - timeE;
-
- // Apply the gas gain including fluctuations
- Int_t signal = (Int_t) (-fGasGain * TMath::Log(gRandom->Rndm()));
-
- // The distance of the electron to the center of the pad
- // in units of pad width
- Float_t dist = (xyz[1] - fCol0[iplan] - (colE + 0.5) * fColPadSize)
- / fColPadSize;
-
- // Sum up the signal in the different pixels
- // and apply the pad response
- Int_t rowIdx = rowD + (Int_t) ( rowBox / 2);
- Int_t colIdx = colD + (Int_t) ( colBox / 2);
- Int_t timeIdx = timeD + (Int_t) (timeBox / 2);
- signalSum[rowIdx][colIdx-1][timeIdx] += PadResponse(dist-1.) * signal;
- signalSum[rowIdx][colIdx ][timeIdx] += PadResponse(dist ) * signal;
- signalSum[rowIdx][colIdx+1][timeIdx] += PadResponse(dist+1.) * signal;
-
- }
-
- // Add the padcluster to the detector matrix
- for (iRow = 0; iRow < rowBox; iRow++ ) {
- for (Int_t iCol = 0; iCol < colBox; iCol++ ) {
- for (Int_t iTime = 0; iTime < timeBox; iTime++) {
-
- Int_t rowB = rowH + iRow - (Int_t) ( rowBox / 2);
- Int_t colB = colH + iCol - (Int_t) ( colBox / 2);
- Int_t timeB = timeH + iTime - (Int_t) (timeBox / 2);
-
- Float_t signalB = signalSum[iRow][iCol][iTime];
- if (signalB > 0.0) {
- matrix->AddSignal(rowB,colB,timeB,signalB);
- if (!(matrix->AddTrack(rowB,colB,timeB,track)))
- printf(" More than three tracks in a pixel!\n");
- }
-
- }
- }
- }
+ // 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()) {
- // Create the hits for this chamber
- for (Int_t iRow = 0; iRow < fRowMax[iplan][icham][isect]; iRow++ ) {
- for (Int_t iCol = 0; iCol < fColMax[iplan] ; iCol++ ) {
- for (Int_t iTime = 0; iTime < fTimeMax ; iTime++) {
-
- Float_t signalAmp = matrix->GetSignal(iRow,iCol,iTime);
-
- // Add the noise
- signalAmp = TMath::Max(gRandom->Gaus(signalAmp,fNoise),(Float_t) 0.0);
- // Convert to fC
- signalAmp *= el2fC;
- // Convert to mV
- signalAmp *= fChipGain;
- // Convert to ADC counts
- Int_t adc = (Int_t) (signalAmp * (fADCoutRange / fADCinRange));
-
- // Apply threshold on ADC value
- if (adc > fADCthreshold) {
-
- Int_t trackSave[3];
- for (Int_t ii = 0; ii < 3; ii++) {
- trackSave[ii] = matrix->GetTrack(iRow,iCol,iTime,ii);
- }
-
- Int_t digits[7];
- digits[0] = matrix->GetSector();
- digits[1] = matrix->GetChamber();
- digits[2] = matrix->GetPlane();
- digits[3] = iRow;
- digits[4] = iCol;
- digits[5] = iTime;
- digits[6] = adc;
-
- // Add this digit to the TClonesArray
- AddDigit(trackSave,digits);
- nDigits++;
-
- }
-
- }
- }
- }
+ // Create TR only for electrons
+ Int_t iPdg = gMC->TrackPid();
+ if (TMath::Abs(iPdg) != kPdgElectron) return;
- printf("AliTRDv1::Hits2Digits -- Number of digits found: %d\n",nDigits);
+ Float_t eTR[kNTR];
+ Int_t nTR;
- // Clean up
- delete matrix;
+ // Create TR photons
+ gMC->TrackMomentum(mom);
+ Float_t pTot = mom.Rho();
+ fTR->CreatePhotons(iPdg,pTot,nTR,eTR);
+ if (nTR > kNTR) {
+ printf("AliTRDv1::CreateTRhit -- ");
+ printf("Boundary error: nTR = %d, kNTR = %d\n",nTR,kNTR);
+ exit(1);
+ }
+ // Loop through the TR photons
+ for (Int_t iTR = 0; iTR < nTR; iTR++) {
+
+ Float_t energyMeV = eTR[iTR] * 0.001;
+ Float_t energyeV = eTR[iTR] * 1000.0;
+ Float_t absLength = 0;
+ Float_t sigma = 0;
+
+ // Take the absorbtion in the entrance window into account
+ Double_t muMy = fTR->GetMuMy(energyMeV);
+ sigma = muMy * fFoilDensity;
+ absLength = gRandom->Exp(sigma);
+ if (absLength < AliTRDgeometry::MyThick()) continue;
+
+ // The absorbtion cross sections in the drift gas
+ if (fGasMix == 1) {
+ // Gas-mixture (Xe/CO2)
+ Double_t muXe = fTR->GetMuXe(energyMeV);
+ Double_t muCO = fTR->GetMuCO(energyMeV);
+ sigma = (0.85 * muXe + 0.15 * muCO) * fGasDensity;
+ }
+ else {
+ // Gas-mixture (Xe/Isobutane)
+ Double_t muXe = fTR->GetMuXe(energyMeV);
+ Double_t muBu = fTR->GetMuBu(energyMeV);
+ sigma = (0.97 * muXe + 0.03 * muBu) * fGasDensity;
}
- }
- }
- // Fill the digits-tree
- printf("AliTRDv1::Hits2Digits -- Fill the digits tree\n");
- DigitsTree->Fill();
+ // The distance after which the energy of the TR photon
+ // is deposited.
+ absLength = gRandom->Exp(sigma);
+ if (absLength > AliTRDgeometry::DrThick()) continue;
-}
+ // The position of the absorbtion
+ Float_t posHit[3];
+ gMC->TrackPosition(pos);
+ posHit[0] = pos[0] + mom[0] / pTot * absLength;
+ posHit[1] = pos[1] + mom[1] / pTot * absLength;
+ posHit[2] = pos[2] + mom[2] / pTot * absLength;
-//_____________________________________________________________________________
-void AliTRDv1::Digits2Clusters()
-{
+ // Create the charge
+ Int_t q = ((Int_t) (energyeV / kWion));
- //
- // Method to convert AliTRDdigits created by AliTRDv1::Hits2Digits()
- // into AliTRDclusters
- // To produce cluster from a root-file with TRD-digits use the
- // slowClusterCreate.C macro.
- //
-
- Int_t row
-
- printf("AliTRDv1::Digits2Clusters -- Start creating clusters\n");
-
- AliTRDdigit *TRDdigit;
- TClonesArray *TRDDigits;
-
- // Parameters
- Float_t maxThresh = fClusMaxThresh; // threshold value for maximum
- Float_t signalThresh = fClusSigThresh; // threshold value for digit signal
- Int_t clusteringMethod = fClusMethod; // clustering method option (for testing)
-
- const Float_t epsilon = 0.01; // iteration limit for unfolding procedure
-
- // Get the pointer to the digits tree
- TTree *DigitTree = gAlice->TreeD();
- // Get the pointer to the cluster tree
- TTree *ClusterTree = gAlice->TreeD();
-
- // Get the pointer to the digits container
- TRDDigits = Digits();
-
- Int_t chamBeg = 0;
- Int_t chamEnd = kNcham;
- if (fSensChamber) chamEnd = chamBeg = fSensChamber;
- Int_t planBeg = 0;
- Int_t planEnd = kNplan;
- if (fSensPlane) planEnd = planBeg = fSensPlane;
- Int_t sectBeg = 0;
- Int_t sectEnd = kNsect;
- if (fSensSector) sectEnd = sectBeg = fSensSector;
-
- // Import the digit tree
- gAlice->ResetDigits();
- Int_t nbytes;
- nbytes += DigitTree->GetEvent(1);
-
- // Get the number of digits in the detector
- Int_t nTRDDigits = TRDDigits->GetEntriesFast();
-
- // *** Start clustering *** in every chamber
- for (Int_t icham = chamBeg; icham < chamEnd; icham++) {
- for (Int_t iplan = planBeg; iplan < planEnd; iplan++) {
- for (Int_t isect = sectBeg; isect < sectEnd; isect++) {
-
- Int_t nClusters = 0;
- printf("AliTRDv1::Digits2Clusters -- Finding clusters in chamber %d, plane %d, sector %d\n"
- ,icham+1,iplan+1,isect+1);
-
- // Create a detector matrix to keep maxima
- AliTRDmatrix *digitMatrix = new AliTRDmatrix(fRowMax[iplan][icham][isect]
- ,fColMax[iplan]
- ,fTimeMax,isect+1
- ,icham+1,iplan+1);
- // Create a matrix to contain maximum flags
- AliTRDmatrix *maximaMatrix = new AliTRDmatrix(fRowMax[iplan][icham][isect]
- ,fColMax[iplan]
- ,fTimeMax
- ,isect+1,icham+1,iplan+1);
-
- // Loop through all TRD digits
- for (Int_t iTRDDigits = 0; iTRDDigits < nTRDDigits; iTRDDigits++) {
-
- // Get the information for this digit
- TRDdigit = (AliTRDdigit*) TRDDigits->UncheckedAt(iTRDDigits);
- Int_t signal = TRDdigit->fSignal;
- Int_t sector = TRDdigit->fSector;
- Int_t chamber = TRDdigit->fChamber;
- Int_t plane = TRDdigit->fPlane;
- Int_t row = TRDdigit->fRow;
- Int_t col = TRDdigit->fCol;
- Int_t time = TRDdigit->fTime;
-
- Int_t track[3];
- for (Int_t iTrack = 0; iTrack < 3; iTrack++) {
- track[iTrack] = TRDdigit->AliDigit::fTracks[iTrack];
- }
+ // Add the hit to the array. TR photon hits are marked
+ // by negative charge
+ AddHit(gAlice->CurrentTrack(),det,posHit,-q,kTRUE);
- if ((sector != isect+1) ||
- (plane != iplan+1) ||
- (chamber != icham+1))
- continue;
-
- // Fill the detector matrix
- if (signal > signalThresh) {
- digitMatrix->SetSignal(row,col,time,signal);
- for (Int_t iTrack = 0; iTrack < 3; iTrack++) {
- if (track[iTrack] > 0) {
- digitMatrix->AddTrack(row,col,time,track[iTrack]);
- }
- }
- }
+ }
- }
-
- // Loop chamber and find maxima in digitMatrix
- for (row = 0; row < fRowMax[iplan][icham][isect]; row++) {
- for (Int_t col = 1; col < fColMax[iplan] ; col++) {
- for (Int_t time = 0; time < fTimeMax ; time++) {
-
- if (digitMatrix->GetSignal(row,col,time)
- < digitMatrix->GetSignal(row,col - 1,time)) {
- // really maximum?
- if (col > 1) {
- if (digitMatrix->GetSignal(row,col - 2,time)
- < digitMatrix->GetSignal(row,col - 1,time)) {
- // yes, so set maximum flag
- maximaMatrix->SetSignal(row,col - 1,time,1);
- }
- else maximaMatrix->SetSignal(row,col - 1,time,0);
- }
- }
-
- } // time
- } // col
- } // row
-
- // now check maxima and calculate cluster position
- for (row = 0; row < fRowMax[iplan][icham][isect]; row++) {
- for (Int_t col = 1; col < fColMax[iplan] ; col++) {
- for (Int_t time = 0; time < fTimeMax ; time++) {
-
- if ((maximaMatrix->GetSignal(row,col,time) > 0)
- && (digitMatrix->GetSignal(row,col,time) > maxThresh)) {
-
- Int_t clusters[5] = {0}; // cluster-object data
-
- Float_t ratio = 0; // ratio resulting from unfolding
- Float_t padSignal[5] = {0}; // signals on max and neighbouring pads
- Float_t clusterSignal[3] = {0}; // signals from cluster
- Float_t clusterPos[3] = {0}; // cluster in ALICE refFrame coords
- Float_t clusterPads[6] = {0}; // cluster pad info
-
- // setting values
- clusters[0] = isect+1; // = isect ????
- clusters[1] = icham+1; // = ichamber ????
- clusters[2] = iplan+1; // = iplane ????
- clusters[3] = time;
-
- clusterPads[0] = icham+1;
- clusterPads[1] = isect+1;
- clusterPads[2] = iplan+1;
-
- for (Int_t iPad = 0; iPad < 3; iPad++) {
- clusterSignal[iPad] = digitMatrix->GetSignal(row,col-1+iPad,time);
- }
-
- // neighbouring maximum on right side?
- if (col < fColMax[iplan] - 2) {
- if (maximaMatrix->GetSignal(row,col + 2,time) > 0) {
- for (Int_t iPad = 0; iPad < 5; iPad++) {
- padSignal[iPad] = digitMatrix->GetSignal(row,col-1+iPad,time);
- }
-
- // unfold:
- ratio = Unfold(epsilon, padSignal);
-
- // set signal on overlapping pad to ratio
- clusterSignal[2] *= ratio;
- }
- }
-
- switch (clusteringMethod) {
- case 1:
- // method 1: simply center of mass
- clusterPads[3] = row + 0.5;
- clusterPads[4] = col - 0.5 + (clusterSignal[2] - clusterSignal[0]) /
- (clusterSignal[1] + clusterSignal[2] + clusterSignal[3]);
- clusterPads[5] = time + 0.5;
-
- nClusters++;
- break;
- case 2:
- // method 2: integral gauss fit on 3 pads
- TH1F *hPadCharges = new TH1F("hPadCharges", "Charges on center 3 pads"
- , 5, -1.5, 3.5);
- for (Int_t iCol = -1; iCol <= 3; iCol++) {
- if (clusterSignal[iCol] < 1) clusterSignal[iCol] = 1;
- hPadCharges->Fill(iCol, clusterSignal[iCol]);
- }
- hPadCharges->Fit("gaus", "IQ", "SAME", -0.5, 2.5);
- TF1 *fPadChargeFit = hPadCharges->GetFunction("gaus");
- Double_t colMean = fPadChargeFit->GetParameter(1);
-
- clusterPads[3] = row + 0.5;
- clusterPads[4] = col - 1.5 + colMean;
- clusterPads[5] = time + 0.5;
-
- delete hPadCharges;
-
- nClusters++;
- break;
- }
-
- Float_t clusterCharge = clusterSignal[0]
- + clusterSignal[1]
- + clusterSignal[2];
- clusters[4] = (Int_t)clusterCharge;
-
- Int_t trackSave[3];
- for (Int_t iTrack = 0; iTrack < 3; iTrack++) {
- trackSave[iTrack] = digitMatrix->GetTrack(row,col,time,iTrack);
- }
-
- // Calculate cluster position in ALICE refFrame coords
- // and set array clusterPos to calculated values
- Pads2XYZ(clusterPads, clusterPos);
-
- // Add cluster to reconstruction tree
- AddCluster(trackSave,clusters,clusterPos);
-
- }
-
- } // time
- } // col
- } // row
-
- printf("AliTRDv1::Digits2Clusters -- Number of clusters found: %d\n",nClusters);
-
- delete digitMatrix;
- delete maximaMatrix;
-
- } // isect
- } // iplan
- } // icham
-
- // Fill the cluster-tree
- printf("AliTRDv1::Digits2Clusters -- Total number of clusters found: %d\n"
- ,fClusters->GetEntries());
- printf("AliTRDv1::Digits2Clusters -- Fill the cluster tree\n");
- ClusterTree->Fill();
+ }
}
{
//
// Initialise Transition Radiation Detector after geometry has been built.
- // Includes the default settings of all parameter for the digitization.
//
AliTRD::Init();
- printf(" Slow simulator\n");
- if (fSensPlane)
- printf(" Only plane %d is sensitive\n",fSensPlane);
- if (fSensChamber)
- printf(" Only chamber %d is sensitive\n",fSensChamber);
- if (fSensSector)
- printf(" Only sector %d is sensitive\n",fSensSector);
+ 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);
-
- // Identifier of the sensitive volume (drift region)
- fIdSens = gMC->VolId("UL05");
-
- // Identifier of the TRD-driftchambers
- fIdChamber1 = gMC->VolId("UCIO");
- fIdChamber2 = gMC->VolId("UCIM");
- fIdChamber3 = gMC->VolId("UCII");
-
- // The default parameter for the digitization
- if (!(fGasGain)) fGasGain = 2.0E3;
- if (!(fNoise)) fNoise = 3000.;
- if (!(fChipGain)) fChipGain = 10.;
- if (!(fADCoutRange)) fADCoutRange = 255.;
- if (!(fADCinRange)) fADCinRange = 2000.;
- if (!(fADCthreshold)) fADCthreshold = 1;
-
- // Transverse and longitudinal diffusion coefficients (Xe/Isobutane)
- if (!(fDiffusionT)) fDiffusionT = 0.060;
- if (!(fDiffusionL)) fDiffusionL = 0.017;
-
- // The default parameter for the clustering
- if (!(fClusMaxThresh)) fClusMaxThresh = 5.0;
- if (!(fClusSigThresh)) fClusSigThresh = 2.0;
- if (!(fClusMethod)) fClusMethod = 1;
-
- for (Int_t i = 0; i < 80; i++) printf("*");
- printf("\n");
+ 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");
+ }
}
//_____________________________________________________________________________
-Float_t AliTRDv1::PadResponse(Float_t x)
+AliTRDsim *AliTRDv1::CreateTR()
{
//
- // The pad response for the chevron pads.
- // We use a simple Gaussian approximation which should be good
- // enough for our purpose.
+ // Enables the simulation of TR
//
- // The parameters for the response function
- const Float_t aa = 0.8872;
- const Float_t bb = -0.00573;
- const Float_t cc = 0.454;
- const Float_t cc2 = cc*cc;
-
- Float_t pr = aa * (bb + TMath::Exp(-x*x / (2. * cc2)));
-
- return (pr);
+ fTR = new AliTRDsim();
+ return fTR;
}
void AliTRDv1::SetSensPlane(Int_t iplane)
{
//
- // Defines the hit-sensitive plane (1-6)
+ // Defines the hit-sensitive plane (0-5)
//
- if ((iplane < 0) || (iplane > 6)) {
+ if ((iplane < 0) || (iplane > 5)) {
printf("Wrong input value: %d\n",iplane);
printf("Use standard setting\n");
- fSensPlane = 0;
- fSensSelect = 0;
+ fSensPlane = -1;
+ fSensSelect = 0;
return;
}
void AliTRDv1::SetSensChamber(Int_t ichamber)
{
//
- // Defines the hit-sensitive chamber (1-5)
+ // Defines the hit-sensitive chamber (0-4)
//
- if ((ichamber < 0) || (ichamber > 5)) {
+ if ((ichamber < 0) || (ichamber > 4)) {
printf("Wrong input value: %d\n",ichamber);
printf("Use standard setting\n");
- fSensChamber = 0;
- fSensSelect = 0;
+ fSensChamber = -1;
+ fSensSelect = 0;
return;
}
void AliTRDv1::SetSensSector(Int_t isector)
{
//
- // Defines the hit-sensitive sector (1-18)
+ // 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 > 18)) {
- printf("Wrong input value: %d\n",isector);
+ if ((isector < 0) || (isector > 17)) {
+ printf("Wrong input value <isector>: %d\n",isector);
printf("Use standard setting\n");
- fSensSector = 0;
- fSensSelect = 0;
+ fSensSector = -1;
+ fSensSectorRange = 0;
+ fSensSelect = 0;
return;
}
- fSensSelect = 1;
- fSensSector = isector;
+ 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;
+ }
+
+ fSensSelect = 1;
+ fSensSector = isector;
+ fSensSectorRange = nsector;
}
void AliTRDv1::StepManager()
{
//
- // Called at every step in the Transition Radiation Detector version 2.
// 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 iIdSens, icSens;
- Int_t iIdSpace, icSpace;
- Int_t iIdChamber, icChamber;
- Int_t vol[3];
- Int_t iPid;
+ 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[4];
+ Float_t hits[3];
+ Float_t moms[3];
Float_t random[1];
Float_t charge;
Float_t aMass;
- Double_t pTot;
- Double_t qTot;
+ Double_t pTot = 0;
Double_t eDelta;
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 Double_t kBig = 1.0E+12;
// Ionization energy
- const Float_t kWion = 22.04;
- // Maximum energy for e+ e- g for the step-size calculation
- const Float_t kPTotMax = 0.002;
+ 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;
+ 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;
// First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2)
- const Float_t kPoti = 12.1;
+ 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->IsTrackDisappeared())) {
// Inside a sensitive volume?
- iIdSens = gMC->CurrentVolID(icSens);
- if (iIdSens == fIdSens) {
-
- iIdSpace = gMC->CurrentVolOffID(4,icSpace );
- iIdChamber = gMC->CurrentVolOffID(1,icChamber);
-
- // 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 = (Double_t) ((Int_t) (eDelta / kWion) + 1);
+ drRegion = kFALSE;
+ amRegion = kFALSE;
+ cIdCurrent = gMC->CurrentVolName();
+ if (cIdCurrent[1] == cIdSensDr) {
+ drRegion = kTRUE;
+ }
+ if (cIdCurrent[1] == cIdSensAm) {
+ 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];
- hits[3] = qTot;
-
- // The sector number
- Float_t phi = pos[1] != 0 ? TMath::Atan2(pos[0],pos[1]) : (pos[0] > 0 ? 180. : 0.);
- vol[0] = ((Int_t) (phi / 20)) + 1;
-
- // The chamber number
- // 1: outer left
- // 2: middle left
- // 3: inner
- // 4: middle right
- // 5: outer right
- if (iIdChamber == fIdChamber1)
- vol[1] = (hits[2] < 0 ? 1 : 5);
- else if (iIdChamber == fIdChamber2)
- vol[1] = (hits[2] < 0 ? 2 : 4);
- else if (iIdChamber == fIdChamber3)
- vol[1] = 3;
-
- // The plane number
- vol[2] = icChamber - TMath::Nint((Float_t) (icChamber / 7)) * 6;
+
+ // 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);
+ cha = ((Int_t) idChamber / kNplan);
+ pla = ((Int_t) idChamber % kNplan);
// Check on selected volumes
Int_t addthishit = 1;
if (fSensSelect) {
- if ((fSensPlane) && (vol[2] != fSensPlane )) addthishit = 0;
- if ((fSensChamber) && (vol[1] != fSensChamber)) addthishit = 0;
- if ((fSensSector) && (vol[0] != fSensSector )) addthishit = 0;
+ 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) {
- new(lhits[fNhits++]) AliTRDhit(fIshunt,gAlice->CurrentTrack(),vol,hits);
-
- // The energy loss according to Bethe Bloch
- gMC->TrackMomentum(mom);
- pTot = mom.Rho();
- iPid = gMC->TrackPid();
- if ( (iPid > 3) ||
- ((iPid <= 3) && (pTot < kPTotMax))) {
- aMass = gMC->TrackMass();
- 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
+ // The detector number
+ det = fGeometry->GetDetector(pla,cha,sec);
+
+ // Special hits and TR photons 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
+ if (gMC->IsTrackEntering() || gMC->IsTrackExiting()) {
+ gMC->TrackMomentum(mom);
+ moms[0] = mom[0];
+ moms[1] = mom[1];
+ moms[2] = mom[2];
+ AddHit(gAlice->CurrentTrack(),det,moms,0,kTRUE);
+ AddHit(gAlice->CurrentTrack(),det,hits,0,kTRUE);
+ }
+
+ // 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
+ if (drRegion) {
+ AddHit(gAlice->CurrentTrack(),det,hits,qTot,kTRUE);
+ }
else {
- pp = kPrim * kPlateau;
- }
-
+ AddHit(gAlice->CurrentTrack(),det,hits,qTot,kFALSE);
+ }
+
// Calculate the maximum step size for the next tracking step
- if (pp > 0) {
- do
- gMC->Rndm(random,1);
- while ((random[0] == 1.) || (random[0] == 0.));
- gMC->SetMaxStep( - TMath::Log(random[0]) / pp);
+ // 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->Rndm(random,1);
+ while ((random[0] == 1.) || (random[0] == 0.));
+ stepSize = - TMath::Log(random[0]) / pp;
+ gMC->SetMaxStep(stepSize);
+ }
+
}
}
- else {
- // set step size to maximal value
- gMC->SetMaxStep(kBig);
- }
}
//const Double_t kP4 = 1.8631;
//const Double_t kP5 = 1.9479;
- if (bg > 0) {
+ // 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 0;
+ else {
+ return kBBMax;
+ }
}
Int_t pos1, pos2;
- const Int_t nV = 31;
+ const Int_t kNv = 31;
- Float_t vxe[nV] = { 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 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[nV] = { 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 };
+ 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];
}
while (dpos > 0);
pos2--;
- if (pos2 > nV) pos2 = nV;
+ if (pos2 > kNv) pos2 = kNv - 1;
pos1 = pos2 - 1;
// Differentiate between the sampling points
return dnde;
}
-
-//_____________________________________________________________________________
-void AliTRDv1::Pads2XYZ(Float_t *pads, Float_t *pos)
-{
- // Method to convert pad coordinates (row,col,time)
- // into ALICE reference frame coordinates (x,y,z)
-
- Int_t chamber = (Int_t) pads[0]; // chamber info (1-5)
- Int_t sector = (Int_t) pads[1]; // sector info (1-18)
- Int_t plane = (Int_t) pads[2]; // plane info (1-6)
-
- Int_t icham = chamber - 1; // chamber info (0-4)
- Int_t isect = sector - 1; // sector info (0-17)
- Int_t iplan = plane - 1; // plane info (0-5)
-
- Float_t padRow = pads[3]; // Pad Row position
- Float_t padCol = pads[4]; // Pad Column position
- Float_t timeSlice = pads[5]; // Time "position"
-
- // calculate (x,y) position in rotated chamber
- Float_t yRot = fCol0[iplan] + padCol * fColPadSize;
- Float_t xRot = fTime0[iplan] + timeSlice * fTimeBinSize;
- // calculate z-position:
- Float_t z = fRow0[iplan][icham][isect] + padRow * fRowPadSize;
-
- /**
- rotate chamber back to original position
- 1. mirror at y-axis, 2. rotate back to position (-phi)
- / cos(phi) -sin(phi) \ / -1 0 \ / -cos(phi) -sin(phi) \
- \ sin(phi) cos(phi) / * \ 0 1 / = \ -sin(phi) cos(phi) /
- **/
- //Float_t phi = 2*kPI / kNsect * ((Float_t) sector - 0.5);
- //Float_t x = -xRot * TMath::Cos(phi) - yRot * TMath::Sin(phi);
- //Float_t y = -xRot * TMath::Sin(phi) + yRot * TMath::Cos(phi);
- Float_t phi = 2*kPI / kNsect * ((Float_t) sector - 0.5);
- Float_t x = -xRot * TMath::Cos(phi) + yRot * TMath::Sin(phi);
- Float_t y = xRot * TMath::Sin(phi) + yRot * TMath::Cos(phi);
-
- // Setting values
- pos[0] = x;
- pos[1] = y;
- pos[2] = z;
-
-}
-
-//_____________________________________________________________________________
-Float_t AliTRDv1::Unfold(Float_t eps, Float_t* padSignal)
-{
- // Method to unfold neighbouring maxima.
- // The charge ratio on the overlapping pad is calculated
- // until there is no more change within the range given by eps.
- // The resulting ratio is then returned to the calling method.
-
- Int_t itStep = 0; // count iteration steps
-
- Float_t ratio = 0.5; // start value for ratio
- Float_t prevRatio = 0; // store previous ratio
-
- Float_t newLeftSignal[3] = {0}; // array to store left cluster signal
- Float_t newRightSignal[3] = {0}; // array to store right cluster signal
-
- // start iteration:
- while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
-
- itStep++;
- prevRatio = ratio;
-
- // cluster position according to charge ratio
- Float_t maxLeft = (ratio*padSignal[2] - padSignal[0]) /
- (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
- Float_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2]) /
- ((1-ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
-
- // set cluster charge ratio
- Float_t ampLeft = padSignal[1];
- Float_t ampRight = padSignal[3];
-
- // apply pad response to parameters
- newLeftSignal[0] = ampLeft*PadResponse(-1 - maxLeft);
- newLeftSignal[1] = ampLeft*PadResponse( 0 - maxLeft);
- newLeftSignal[2] = ampLeft*PadResponse( 1 - maxLeft);
-
- newRightSignal[0] = ampRight*PadResponse(-1 - maxRight);
- newRightSignal[1] = ampRight*PadResponse( 0 - maxRight);
- newRightSignal[2] = ampRight*PadResponse( 1 - maxRight);
-
- // calculate new overlapping ratio
- ratio = newLeftSignal[2]/(newLeftSignal[2] + newRightSignal[0]);
-
- }
-
- return ratio;
-
-}
-
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff