/*
$Log$
+Revision 1.24 2001/05/21 16:45:47 hristov
+Last minute changes (C.Blume)
+
+Revision 1.23 2001/05/07 08:04:48 cblume
+New TRF and PRF. Speedup of the code. Digits from amplification region included
+
+Revision 1.22 2001/03/30 14:40:14 cblume
+Update of the digitization parameter
+
+Revision 1.21 2001/03/13 09:30:35 cblume
+Update of digitization. Moved digit branch definition to AliTRD
+
+Revision 1.20 2001/02/25 20:19:00 hristov
+Minor correction: loop variable declared only once for HP, Sun
+
+Revision 1.19 2001/02/14 18:22:26 cblume
+Change in the geometry of the padplane
+
+Revision 1.18 2001/01/26 19:56:57 hristov
+Major upgrade of AliRoot code
+
+Revision 1.17 2000/12/08 12:53:27 cblume
+Change in Copy() function for HP-compiler
+
+Revision 1.16 2000/12/07 12:20:46 cblume
+Go back to array compression. Use sampled PRF to speed up digitization
+
+Revision 1.15 2000/11/23 14:34:08 cblume
+Fixed bug in expansion routine of arrays (initialize buffers properly)
+
+Revision 1.14 2000/11/20 08:54:44 cblume
+Switch off compression as default
+
+Revision 1.13 2000/11/10 14:57:52 cblume
+Changes in the geometry constants for the DEC compiler
+
+Revision 1.12 2000/11/01 14:53:20 cblume
+Merge with TRD-develop
+
+Revision 1.1.4.9 2000/10/26 17:00:22 cblume
+Fixed bug in CheckDetector()
+
+Revision 1.1.4.8 2000/10/23 13:41:35 cblume
+Added protection against Log(0) in the gas gain calulation
+
+Revision 1.1.4.7 2000/10/17 02:27:34 cblume
+Get rid of global constants
+
+Revision 1.1.4.6 2000/10/16 01:16:53 cblume
+Changed timebin 0 to be the one closest to the readout
+
+Revision 1.1.4.5 2000/10/15 23:34:29 cblume
+Faster version of the digitizer
+
+Revision 1.1.4.4 2000/10/06 16:49:46 cblume
+Made Getters const
+
+Revision 1.1.4.3 2000/10/04 16:34:58 cblume
+Replace include files by forward declarations
+
+Revision 1.1.4.2 2000/09/22 14:41:10 cblume
+Bug fix in PRF. Included time response. New structure
+
+Revision 1.10 2000/10/05 07:27:53 cblume
+Changes in the header-files by FCA
+
+Revision 1.9 2000/10/02 21:28:19 fca
+Removal of useless dependecies via forward declarations
+
+Revision 1.8 2000/06/09 11:10:07 cblume
+Compiler warnings and coding conventions, next round
+
+Revision 1.7 2000/06/08 18:32:58 cblume
+Make code compliant to coding conventions
+
Revision 1.6 2000/06/07 16:27:32 cblume
Try to remove compiler warnings on Sun and HP
// //
///////////////////////////////////////////////////////////////////////////////
+#include <stdlib.h>
+
#include <TMath.h>
#include <TVector.h>
#include <TRandom.h>
+#include <TROOT.h>
+#include <TTree.h>
+#include <TFile.h>
+#include <TF1.h>
+
+#include "AliRun.h"
+#include "AliMagF.h"
#include "AliTRD.h"
+#include "AliTRDhit.h"
#include "AliTRDdigitizer.h"
#include "AliTRDdataArrayI.h"
#include "AliTRDdataArrayF.h"
+#include "AliTRDsegmentArray.h"
#include "AliTRDdigitsManager.h"
+#include "AliTRDgeometry.h"
ClassImp(AliTRDdigitizer)
// AliTRDdigitizer default constructor
//
- fInputFile = NULL;
- fDigits = NULL;
- fTRD = NULL;
- fGeo = NULL;
- fPRF = NULL;
-
- fEvent = 0;
- fGasGain = 0.0;
- fNoise = 0.0;
- fChipGain = 0.0;
- fADCoutRange = 0.0;
- fADCinRange = 0.0;
- fADCthreshold = 0;
- fDiffusionOn = 0;
- fDiffusionT = 0.0;
- fDiffusionL = 0.0;
- fElAttachOn = 0;
- fElAttachProp = 0.0;
- fExBOn = 0;
- fLorentzAngle = 0.0;
+ fInputFile = NULL;
+ fDigits = NULL;
+ fTRD = NULL;
+ fGeo = NULL;
+ fPRFsmp = NULL;
+ fTRFsmp = NULL;
+
+ fEvent = 0;
+ fGasGain = 0.0;
+ fNoise = 0.0;
+ fChipGain = 0.0;
+ fSinRange = 0.0;
+ fSoutRange = 0.0;
+ fADCoutRange = 0.0;
+ fADCinRange = 0.0;
+ fADCthreshold = 0;
+ fDiffusionOn = 0;
+ fDiffusionT = 0.0;
+ fDiffusionL = 0.0;
+ fElAttachOn = 0;
+ fElAttachProp = 0.0;
+ fExBOn = 0;
+ fOmegaTau = 0.0;
+ fPRFOn = 0;
+ fTRFOn = 0;
+ fDriftVelocity = 0.0;
+ fPadCoupling = 0.0;
+ fTimeCoupling = 0.0;
+ fTimeBinWidth = 0.0;
+ fField = 0.0;
+
+ fPRFbin = 0;
+ fPRFlo = 0.0;
+ fPRFhi = 0.0;
+ fPRFwid = 0.0;
+ fPRFpad = 0;
+ fTRFbin = 0;
+ fTRFlo = 0.0;
+ fTRFhi = 0.0;
+ fTRFwid = 0.0;
+
+ fCompress = kTRUE;
+ fVerbose = 1;
+ fSDigits = kFALSE;
}
fDigits = NULL;
fTRD = NULL;
fGeo = NULL;
+ fPRFsmp = NULL;
+ fTRFsmp = NULL;
fEvent = 0;
+ fCompress = kTRUE;
+ fVerbose = 1;
+ fSDigits = kFALSE;
+
Init();
}
//_____________________________________________________________________________
-AliTRDdigitizer::AliTRDdigitizer(AliTRDdigitizer &d)
+AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d)
{
//
// AliTRDdigitizer copy constructor
//
- d.Copy(*this);
+ ((AliTRDdigitizer &) d).Copy(*this);
}
delete fDigits;
}
- if (fPRF) delete fPRF;
-
}
//_____________________________________________________________________________
-void AliTRDdigitizer::Copy(AliTRDdigitizer &d)
+AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d)
{
//
- // Copy function
+ // Assignment operator
//
- d.fInputFile = NULL;
- d.fDigits = NULL;
- d.fTRD = NULL;
- d.fGeo = NULL;
+ if (this != &d) ((AliTRDdigitizer &) d).Copy(*this);
+ return *this;
- d.fEvent = 0;
-
- d.fGasGain = fGasGain;
- d.fNoise = fNoise;
- d.fChipGain = fChipGain;
- d.fADCoutRange = fADCoutRange;
- d.fADCinRange = fADCinRange;
- d.fADCthreshold = fADCthreshold;
- d.fDiffusionOn = fDiffusionOn;
- d.fDiffusionT = fDiffusionT;
- d.fDiffusionL = fDiffusionL;
- d.fElAttachOn = fElAttachOn;
- d.fElAttachProp = fElAttachProp;
- d.fExBOn = fExBOn;
- d.fLorentzAngle = fLorentzAngle;
- d.fLorentzFactor = fLorentzFactor;
+}
- fPRF->Copy(*d.fPRF);
+//_____________________________________________________________________________
+void AliTRDdigitizer::Copy(TObject &d)
+{
+ //
+ // Copy function
+ //
+ Int_t iBin;
+
+ ((AliTRDdigitizer &) d).fInputFile = NULL;
+ ((AliTRDdigitizer &) d).fDigits = NULL;
+ ((AliTRDdigitizer &) d).fTRD = NULL;
+ ((AliTRDdigitizer &) d).fGeo = NULL;
+
+ ((AliTRDdigitizer &) d).fEvent = 0;
+
+ ((AliTRDdigitizer &) d).fGasGain = fGasGain;
+ ((AliTRDdigitizer &) d).fNoise = fNoise;
+ ((AliTRDdigitizer &) d).fChipGain = fChipGain;
+ ((AliTRDdigitizer &) d).fSoutRange = fSoutRange;
+ ((AliTRDdigitizer &) d).fSinRange = fSinRange;
+ ((AliTRDdigitizer &) d).fADCoutRange = fADCoutRange;
+ ((AliTRDdigitizer &) d).fADCinRange = fADCinRange;
+ ((AliTRDdigitizer &) d).fADCthreshold = fADCthreshold;
+ ((AliTRDdigitizer &) d).fDiffusionOn = fDiffusionOn;
+ ((AliTRDdigitizer &) d).fDiffusionT = fDiffusionT;
+ ((AliTRDdigitizer &) d).fDiffusionL = fDiffusionL;
+ ((AliTRDdigitizer &) d).fElAttachOn = fElAttachOn;
+ ((AliTRDdigitizer &) d).fElAttachProp = fElAttachProp;
+ ((AliTRDdigitizer &) d).fExBOn = fExBOn;
+ ((AliTRDdigitizer &) d).fOmegaTau = fOmegaTau;
+ ((AliTRDdigitizer &) d).fLorentzFactor = fLorentzFactor;
+ ((AliTRDdigitizer &) d).fDriftVelocity = fDriftVelocity;
+ ((AliTRDdigitizer &) d).fPadCoupling = fPadCoupling;
+ ((AliTRDdigitizer &) d).fTimeCoupling = fTimeCoupling;
+ ((AliTRDdigitizer &) d).fTimeBinWidth = fTimeBinWidth;
+ ((AliTRDdigitizer &) d).fField = fField;
+ ((AliTRDdigitizer &) d).fPRFOn = fPRFOn;
+ ((AliTRDdigitizer &) d).fTRFOn = fTRFOn;
+
+ ((AliTRDdigitizer &) d).fCompress = fCompress;
+ ((AliTRDdigitizer &) d).fVerbose = fVerbose;
+ ((AliTRDdigitizer &) d).fSDigits = fSDigits;
+
+ ((AliTRDdigitizer &) d).fPRFbin = fPRFbin;
+ ((AliTRDdigitizer &) d).fPRFlo = fPRFlo;
+ ((AliTRDdigitizer &) d).fPRFhi = fPRFhi;
+ ((AliTRDdigitizer &) d).fPRFwid = fPRFwid;
+ ((AliTRDdigitizer &) d).fPRFpad = fPRFpad;
+ if (((AliTRDdigitizer &) d).fPRFsmp) delete ((AliTRDdigitizer &) d).fPRFsmp;
+ ((AliTRDdigitizer &) d).fPRFsmp = new Float_t[fPRFbin];
+ for (iBin = 0; iBin < fPRFbin; iBin++) {
+ ((AliTRDdigitizer &) d).fPRFsmp[iBin] = fPRFsmp[iBin];
+ }
+ ((AliTRDdigitizer &) d).fTRFbin = fTRFbin;
+ ((AliTRDdigitizer &) d).fTRFlo = fTRFlo;
+ ((AliTRDdigitizer &) d).fTRFhi = fTRFhi;
+ ((AliTRDdigitizer &) d).fTRFwid = fTRFwid;
+ if (((AliTRDdigitizer &) d).fTRFsmp) delete ((AliTRDdigitizer &) d).fTRFsmp;
+ ((AliTRDdigitizer &) d).fTRFsmp = new Float_t[fTRFbin];
+ for (iBin = 0; iBin < fTRFbin; iBin++) {
+ ((AliTRDdigitizer &) d).fTRFsmp[iBin] = fTRFsmp[iBin];
+ }
+
}
//_____________________________________________________________________________
xyz[0] = gRandom->Gaus(xyz[0], sigmaL * fLorentzFactor);
xyz[1] = gRandom->Gaus(xyz[1], sigmaT * fLorentzFactor);
xyz[2] = gRandom->Gaus(xyz[2], sigmaT);
+
return 1;
}
//
xyz[0] = xyz[0];
- xyz[1] = xyz[1] + fLorentzAngle * driftlength;
+ xyz[1] = xyz[1] + fOmegaTau * driftlength;
xyz[2] = xyz[2];
return 1;
}
+//_____________________________________________________________________________
+Int_t AliTRDdigitizer::PadResponse(Float_t signal, Float_t dist, Float_t *pad)
+{
+ //
+ // Applies the pad response
+ //
+
+ Int_t iBin = ((Int_t) (( - dist - fPRFlo) / fPRFwid));
+
+ Int_t iBin0 = iBin - fPRFpad;
+ Int_t iBin1 = iBin;
+ Int_t iBin2 = iBin + fPRFpad;
+
+ if ((iBin0 >= 0) && (iBin2 < fPRFbin)) {
+
+ pad[0] = signal * fPRFsmp[iBin0];
+ pad[1] = signal * fPRFsmp[iBin1];
+ pad[2] = signal * fPRFsmp[iBin2];
+
+ return 1;
+
+ }
+ else {
+
+ return 0;
+
+ }
+
+}
+
+//_____________________________________________________________________________
+Float_t AliTRDdigitizer::TimeResponse(Float_t time)
+{
+ //
+ // Applies the preamp shaper time response
+ //
+
+ Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));
+ if ((iBin >= 0) && (iBin < fTRFbin)) {
+ return fTRFsmp[iBin];
+ }
+ else {
+ return 0.0;
+ }
+
+}
+
//_____________________________________________________________________________
void AliTRDdigitizer::Init()
{
//
// The default parameter for the digitization
- fGasGain = 2.0E3;
- fNoise = 3000.;
- fChipGain = 10.;
- fADCoutRange = 255.;
- fADCinRange = 2000.;
- fADCthreshold = 1;
-
- // Transverse and longitudinal diffusion coefficients (Xe/Isobutane)
- fDiffusionOn = 1;
- fDiffusionT = 0.060;
- fDiffusionL = 0.017;
+ fGasGain = 2800.;
+ fChipGain = 6.1;
+ fNoise = 1000.;
+ fADCoutRange = 1023.; // 10-bit ADC
+ fADCinRange = 1000.; // 1V input range
+ fADCthreshold = 1;
- // Propability for electron attachment
- fElAttachOn = 0;
- fElAttachProp = 0.0;
+ // For the summable digits
+ fSinRange = 1000000.;
+ fSoutRange = 1000000.;
+
+ // The drift velocity (cm / mus)
+ fDriftVelocity = 1.5;
+
+ // Diffusion on
+ fDiffusionOn = 1;
// E x B effects
- fExBOn = 0;
- // omega * tau. (tau ~ 12 * 10^-12, B = 0.2T)
- fLorentzAngle = 17.6 * 12.0 * 0.2 * 0.01;
+ fExBOn = 0;
+
+ // Propability for electron attachment
+ fElAttachOn = 0;
+ fElAttachProp = 0.0;
// The pad response function
- fPRF = new TF1("PRF","[0]*([1]+exp(-x*x/(2.0*[2])))",-2,2);
- fPRF->SetParameter(0, 0.8872);
- fPRF->SetParameter(1,-0.00573);
- fPRF->SetParameter(2, 0.454 * 0.454);
+ fPRFOn = 1;
+
+ // The time response function
+ fTRFOn = 1;
+
+ // The pad coupling factor (same number as for the TPC)
+ fPadCoupling = 0.5;
+
+ // The time coupling factor (same number as for the TPC)
+ fTimeCoupling = 0.4;
+
+}
+
+//_____________________________________________________________________________
+void AliTRDdigitizer::ReInit()
+{
+ //
+ // Reinitializes the digitization procedure after a change in the parameter
+ //
+
+ if (!fGeo) {
+ printf("AliTRDdigitizer::ReInit -- ");
+ printf("No geometry defined. Run InitDetector() first\n");
+ exit(1);
+ }
+
+ // Calculate the time bin width in ns
+ fTimeBinWidth = fGeo->GetTimeBinSize() / fDriftVelocity * 1000.0;
+
+ // The range and the binwidth for the sampled TRF
+ fTRFbin = 100;
+ // Start 0.2 mus before the signal
+ fTRFlo = -0.2 * fDriftVelocity;
+ // End the maximum driftlength after the signal
+ fTRFhi = AliTRDgeometry::DrThick()
+ + fGeo->GetTimeAfter() * fGeo->GetTimeBinSize();
+ fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
+
+ // Transverse and longitudinal diffusion coefficients (Xe/CO2)
+ fDiffusionT = GetDiffusionT(fDriftVelocity,fField);
+ fDiffusionL = GetDiffusionL(fDriftVelocity,fField);
+
+ // omega * tau.= tan(Lorentz-angle)
+ fOmegaTau = GetOmegaTau(fDriftVelocity,fField);
+
+ // The Lorentz factor
+ if (fExBOn) {
+ fLorentzFactor = 1.0 / (1.0 + fOmegaTau*fOmegaTau);
+ }
+ else {
+ fLorentzFactor = 1.0;
+ }
+
+}
+
+//_____________________________________________________________________________
+void AliTRDdigitizer::SampleTRF()
+{
+ //
+ // Samples the time response function
+ // It is defined according to Vasiles simulation of the preamp shaper
+ // output and includes the effect of the ion tail (based on Tariqs
+ // Garfield simulation) and a shaping time of 125 ns FWHM
+ //
+
+ Int_t ipos1;
+ Int_t ipos2;
+ Float_t diff;
+
+ const Int_t kNpasa = 200;
+ Float_t time[kNpasa] = { -0.280000, -0.270000, -0.260000, -0.250000
+ , -0.240000, -0.230000, -0.220000, -0.210000
+ , -0.200000, -0.190000, -0.180000, -0.170000
+ , -0.160000, -0.150000, -0.140000, -0.130000
+ , -0.120000, -0.110000, -0.100000, -0.090000
+ , -0.080000, -0.070000, -0.060000, -0.050000
+ , -0.040000, -0.030000, -0.020000, -0.010000
+ , -0.000000, 0.010000, 0.020000, 0.030000
+ , 0.040000, 0.050000, 0.060000, 0.070000
+ , 0.080000, 0.090000, 0.100000, 0.110000
+ , 0.120000, 0.130000, 0.140000, 0.150000
+ , 0.160000, 0.170000, 0.180000, 0.190000
+ , 0.200000, 0.210000, 0.220000, 0.230000
+ , 0.240000, 0.250000, 0.260000, 0.270000
+ , 0.280000, 0.290000, 0.300000, 0.310000
+ , 0.320000, 0.330000, 0.340000, 0.350000
+ , 0.360000, 0.370000, 0.380000, 0.390000
+ , 0.400000, 0.410000, 0.420000, 0.430000
+ , 0.440000, 0.450000, 0.460000, 0.470000
+ , 0.480000, 0.490000, 0.500000, 0.510000
+ , 0.520000, 0.530000, 0.540000, 0.550000
+ , 0.560000, 0.570000, 0.580000, 0.590000
+ , 0.600000, 0.610000, 0.620000, 0.630000
+ , 0.640000, 0.650000, 0.660000, 0.670000
+ , 0.680000, 0.690000, 0.700000, 0.710000
+ , 0.720000, 0.730000, 0.740000, 0.750000
+ , 0.760000, 0.770000, 0.780000, 0.790000
+ , 0.800000, 0.810000, 0.820000, 0.830000
+ , 0.840000, 0.850000, 0.860000, 0.870000
+ , 0.880000, 0.890000, 0.900000, 0.910000
+ , 0.920000, 0.930000, 0.940000, 0.950000
+ , 0.960000, 0.970000, 0.980000, 0.990000
+ , 1.000000, 1.010000, 1.020000, 1.030000
+ , 1.040000, 1.050000, 1.060000, 1.070000
+ , 1.080000, 1.090000, 1.100000, 1.110000
+ , 1.120000, 1.130000, 1.140000, 1.150000
+ , 1.160000, 1.170000, 1.180000, 1.190000
+ , 1.200000, 1.210000, 1.220000, 1.230000
+ , 1.240000, 1.250000, 1.260000, 1.270000
+ , 1.280000, 1.290000, 1.300000, 1.310000
+ , 1.320000, 1.330000, 1.340000, 1.350000
+ , 1.360000, 1.370000, 1.380000, 1.390000
+ , 1.400000, 1.410000, 1.420000, 1.430000
+ , 1.440000, 1.450000, 1.460000, 1.470000
+ , 1.480000, 1.490000, 1.500000, 1.510000
+ , 1.520000, 1.530000, 1.540000, 1.550000
+ , 1.560000, 1.570000, 1.580000, 1.590000
+ , 1.600000, 1.610000, 1.620000, 1.630000
+ , 1.640000, 1.650000, 1.660000, 1.670000
+ , 1.680000, 1.690000, 1.700000, 1.710000 };
+
+ Float_t signal[kNpasa] = { 0.000000, 0.000000, 0.000000, 0.000000
+ , 0.000000, 0.000000, 0.000000, 0.000000
+ , 0.000000, 0.000000, 0.000000, 0.000000
+ , 0.000000, 0.000000, 0.000000, 0.000098
+ , 0.003071, 0.020056, 0.066053, 0.148346
+ , 0.263120, 0.398496, 0.540226, 0.674436
+ , 0.790977, 0.883083, 0.947744, 0.985714
+ , 0.999248, 0.992105, 0.967669, 0.930827
+ , 0.884586, 0.833083, 0.778571, 0.723684
+ , 0.669173, 0.617293, 0.567669, 0.521805
+ , 0.479699, 0.440977, 0.405639, 0.373985
+ , 0.345526, 0.320038, 0.297256, 0.276917
+ , 0.258797, 0.242632, 0.228195, 0.215301
+ , 0.203759, 0.193383, 0.184023, 0.175564
+ , 0.167895, 0.160940, 0.154549, 0.148722
+ , 0.143308, 0.138346, 0.133722, 0.129398
+ , 0.125376, 0.121617, 0.118045, 0.114699
+ , 0.111541, 0.108571, 0.105714, 0.103008
+ , 0.100414, 0.097970, 0.095602, 0.093346
+ , 0.091165, 0.089060, 0.087068, 0.085150
+ , 0.083308, 0.081541, 0.079812, 0.078158
+ , 0.076541, 0.075000, 0.073496, 0.072068
+ , 0.070677, 0.069286, 0.068008, 0.066729
+ , 0.065489, 0.064286, 0.063120, 0.061992
+ , 0.060902, 0.059850, 0.058797, 0.057820
+ , 0.056842, 0.055902, 0.054962, 0.054060
+ , 0.053158, 0.052293, 0.051466, 0.050639
+ , 0.049850, 0.049060, 0.048308, 0.047556
+ , 0.046842, 0.046128, 0.045451, 0.044774
+ , 0.044098, 0.043459, 0.042820, 0.042218
+ , 0.041617, 0.041015, 0.040451, 0.039887
+ , 0.039323, 0.038797, 0.038271, 0.037744
+ , 0.037237, 0.036744, 0.036259, 0.035786
+ , 0.035323, 0.034872, 0.034429, 0.033996
+ , 0.033575, 0.033162, 0.032756, 0.032361
+ , 0.031974, 0.031594, 0.031222, 0.030857
+ , 0.030496, 0.030143, 0.029793, 0.029451
+ , 0.029109, 0.028774, 0.028444, 0.028113
+ , 0.027793, 0.027477, 0.027165, 0.026861
+ , 0.026564, 0.026271, 0.025981, 0.025699
+ , 0.025421, 0.025147, 0.024880, 0.024613
+ , 0.024353, 0.024094, 0.023842, 0.023590
+ , 0.023346, 0.023102, 0.022865, 0.022628
+ , 0.022398, 0.022173, 0.021951, 0.021733
+ , 0.021519, 0.021308, 0.021098, 0.020891
+ , 0.020688, 0.020485, 0.020286, 0.020090
+ , 0.019895, 0.019707, 0.019519, 0.019335
+ , 0.019150, 0.018974, 0.018797, 0.018624
+ , 0.018451, 0.018282, 0.018113, 0.017947
+ , 0.017782, 0.017617, 0.017455, 0.017297 };
+
+ //for (Int_t ipasa = 0; ipasa < kNpasa; ipasa++) {
+ // time[ipasa] += 0.13;
+ // time[ipasa] *= 0.5;
+ //}
+
+ if (fTRFsmp) delete fTRFsmp;
+ fTRFsmp = new Float_t[fTRFbin];
+
+ Float_t loTRF = TMath::Max(fTRFlo / fDriftVelocity,time[0]);
+ Float_t hiTRF = TMath::Min(fTRFhi / fDriftVelocity,time[kNpasa-1]);
+ Float_t binWidth = (hiTRF - loTRF) / ((Float_t) fTRFbin);
+
+ // Take the linear interpolation
+ for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
+
+ Float_t bin = (((Float_t) iBin) + 0.5) * binWidth + loTRF;
+ ipos1 = ipos2 = 0;
+ diff = 0;
+ do {
+ diff = bin - time[ipos2++];
+ } while (diff > 0);
+ ipos2--;
+ if (ipos2 > kNpasa) ipos2 = kNpasa - 1;
+ ipos1 = ipos2 - 1;
+
+ fTRFsmp[iBin] = signal[ipos2]
+ + diff * (signal[ipos2] - signal[ipos1])
+ / ( time[ipos2] - time[ipos1]);
+
+ }
+
+}
+
+//_____________________________________________________________________________
+void AliTRDdigitizer::SamplePRF()
+{
+ //
+ // Samples the pad response function
+ //
+
+ const Int_t kPRFbin = 61;
+ Float_t prf[kPRFbin] = { 0.002340, 0.003380, 0.004900, 0.007080, 0.010220
+ , 0.014740, 0.021160, 0.030230, 0.042800, 0.059830
+ , 0.082030, 0.109700, 0.142550, 0.179840, 0.220610
+ , 0.263980, 0.309180, 0.355610, 0.402790, 0.450350
+ , 0.497930, 0.545190, 0.591740, 0.637100, 0.680610
+ , 0.721430, 0.758400, 0.790090, 0.814720, 0.830480
+ , 0.835930, 0.830480, 0.814710, 0.790070, 0.758390
+ , 0.721410, 0.680590, 0.637080, 0.591730, 0.545180
+ , 0.497920, 0.450340, 0.402790, 0.355610, 0.309190
+ , 0.263990, 0.220630, 0.179850, 0.142570, 0.109720
+ , 0.082040, 0.059830, 0.042820, 0.030230, 0.021170
+ , 0.014740, 0.010230, 0.007080, 0.004900, 0.003380
+ , 0.002340 };
+
+ fPRFlo = -1.5;
+ fPRFhi = 1.5;
+ fPRFbin = kPRFbin;
+ fPRFwid = (fPRFhi - fPRFlo) / ((Float_t) fPRFbin);
+ fPRFpad = ((Int_t) (1.0 / fPRFwid));
+
+ if (fPRFsmp) delete fPRFsmp;
+ fPRFsmp = new Float_t[fPRFbin];
+ for (Int_t iBin = 0; iBin < fPRFbin; iBin++) {
+ fPRFsmp[iBin] = prf[iBin];
+ }
}
return kFALSE;
}
+ return InitDetector();
+
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDdigitizer::InitDetector()
+{
+ //
+ // Sets the pointer to the TRD detector and the geometry
+ //
+
+ // Get the pointer to the detector class and check for version 1
+ fTRD = (AliTRD*) gAlice->GetDetector("TRD");
+ if (fTRD->IsVersion() != 1) {
+ printf("AliTRDdigitizer::InitDetector -- ");
+ printf("TRD must be version 1 (slow simulator).\n");
+ exit(1);
+ }
+
+ // Get the geometry
+ fGeo = fTRD->GetGeometry();
+ printf("AliTRDdigitizer::InitDetector -- ");
+ printf("Geometry version %d\n",fGeo->IsVersion());
+
+ // The magnetic field strength in Tesla
+ fField = 0.2 * gAlice->Field()->Factor();
+
+ ReInit();
+
return kTRUE;
}
+//_____________________________________________________________________________
+Bool_t AliTRDdigitizer::SumSDigits()
+{
+ //
+ // Sums up the summable digits and creates final digits
+ // Not yet implemented
+ //
+
+ return kFALSE;
+
+}
+
//_____________________________________________________________________________
Bool_t AliTRDdigitizer::MakeDigits()
{
//
- // Loops through the TRD-hits and creates the digits.
+ // Creates digits.
//
///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////
// Converts number of electrons to fC
- const Float_t kEl2fC = 1.602E-19 * 1.0E15;
+ const Double_t kEl2fC = 1.602E-19 * 1.0E15;
///////////////////////////////////////////////////////////////
- Int_t iRow, iCol, iTime;
+ // Number of pads included in the pad response
+ const Int_t kNpad = 3;
+
+ // Number of track dictionary arrays
+ const Int_t kNDict = AliTRDdigitsManager::kNDict;
+
+ // Half the width of the amplification region
+ const Float_t kAmWidth = AliTRDgeometry::AmThick() / 2.;
+
+ Int_t iRow, iCol, iTime, iPad;
+ Int_t iDict = 0;
Int_t nBytes = 0;
- Int_t iDict;
Int_t totalSizeDigits = 0;
Int_t totalSizeDict0 = 0;
Int_t totalSizeDict1 = 0;
Int_t totalSizeDict2 = 0;
- AliTRDdataArrayI *digits;
+ Int_t timeTRDbeg = 0;
+ Int_t timeTRDend = 1;
+
+ Float_t pos[3];
+ Float_t rot[3];
+ Float_t xyz[3];
+ Float_t padSignal[kNpad];
+ Float_t signalOld[kNpad];
+
+ AliTRDdataArrayF *signals = 0;
+ AliTRDdataArrayI *digits = 0;
AliTRDdataArrayI *dictionary[kNDict];
+ // Create a digits manager
+ fDigits = new AliTRDdigitsManager();
+
+ // Create a container for the amplitudes
+ AliTRDsegmentArray *signalsArray
+ = new AliTRDsegmentArray("AliTRDdataArrayF",AliTRDgeometry::Ndet());
+
+ if (fTRFOn) {
+ timeTRDbeg = ((Int_t) (-fTRFlo / fGeo->GetTimeBinSize())) - 1;
+ timeTRDend = ((Int_t) ( fTRFhi / fGeo->GetTimeBinSize())) - 1;
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Sample the TRF between -%d and %d\n",timeTRDbeg,timeTRDend);
+ }
+
+ Float_t elAttachProp = fElAttachProp / 100.;
+
+ // Create the sampled PRF
+ SamplePRF();
+
+ // Create the sampled TRF
+ SampleTRF();
+
if (!fGeo) {
printf("AliTRDdigitizer::MakeDigits -- ");
printf("No geometry defined\n");
return kFALSE;
}
- // Create a digits manager
- fDigits = new AliTRDdigitsManager();
-
- // Create detector arrays to keep the signal and track numbers
- AliTRDdataArrayF *signal = new AliTRDdataArrayF();
- AliTRDdataArrayI *tracks[kNDict];
- for (iDict = 0; iDict < kNDict; iDict++) {
- tracks[iDict] = new AliTRDdataArrayI();
- }
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Start creating digits.\n");
+ if (fVerbose > 0) this->Dump();
// Get the pointer to the hit tree
- TTree *hitTree = gAlice->TreeH();
+ TTree *HitTree = gAlice->TreeH();
// 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 nTrack = (Int_t) HitTree->GetEntries();
+ if (fVerbose > 0) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Found %d primary particles\n",nTrack);
+ }
- printf("AliTRDdigitizer::MakeDigits -- ");
- printf("Start creating digits.\n");
+ Int_t detectorOld = -1;
+ Int_t countHits = 0;
- // The Lorentz factor
- if (fExBOn) {
- fLorentzFactor = 1.0 / (1.0 + fLorentzAngle*fLorentzAngle);
- }
- else {
- fLorentzFactor = 1.0;
- }
+ // Loop through all entries in the tree
+ for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
- Int_t chamBeg = 0;
- Int_t chamEnd = kNcham;
- if (fTRD->GetSensChamber() >= 0) {
- chamBeg = fTRD->GetSensChamber();
- chamEnd = chamBeg + 1;
- }
- Int_t planBeg = 0;
- Int_t planEnd = kNplan;
- if (fTRD->GetSensPlane() >= 0) {
- planBeg = fTRD->GetSensPlane();
- planEnd = planBeg + 1;
- }
- Int_t sectBeg = 0;
- Int_t sectEnd = kNsect;
-
- Int_t countHits = 0;
-
- // 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++) {
-
- if (fTRD->GetSensSector() >= 0) {
- Int_t sens1 = fTRD->GetSensSector();
- Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
- sens2 -= ((Int_t) (sens2 / kNsect)) * kNsect;
- if (sens1 < sens2)
- if ((iSect < sens1) || (iSect >= sens2)) continue;
- else
- if ((iSect < sens1) && (iSect >= sens2)) continue;
- }
+ gAlice->ResetHits();
+ nBytes += HitTree->GetEvent(iTrack);
- Int_t nDigits = 0;
-
- printf("AliTRDdigitizer::MakeDigits -- ");
- printf("Digitizing chamber %d, plane %d, sector %d.\n"
- ,iCham,iPlan,iSect);
-
- Int_t iDet = fGeo->GetDetector(iPlan,iCham,iSect);
- Int_t nRowMax = fGeo->GetRowMax(iPlan,iCham,iSect);
- Int_t nColMax = fGeo->GetColMax(iPlan);
- Int_t nTimeMax = fGeo->GetTimeMax();
- Float_t row0 = fGeo->GetRow0(iPlan,iCham,iSect);
- Float_t col0 = fGeo->GetCol0(iPlan);
- Float_t time0 = fGeo->GetTime0(iPlan);
- Float_t rowPadSize = fGeo->GetRowPadSize();
- Float_t colPadSize = fGeo->GetColPadSize();
- Float_t timeBinSize = fGeo->GetTimeBinSize();
-
- // Adjust the size of the detector arrays
- signal->Allocate(nRowMax,nColMax,nTimeMax);
- for (iDict = 0; iDict < kNDict; iDict++) {
- tracks[iDict]->Allocate(nRowMax,nColMax,nTimeMax);
- }
+ // Get the number of hits in the TRD created by this particle
+ Int_t nHit = fTRD->Hits()->GetEntriesFast();
+ if (fVerbose > 0) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Found %d hits for primary particle %d\n",nHit,iTrack);
+ }
- // 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 = fTRD->Hits()->GetEntriesFast();
-
- // Loop through the TRD hits
- for (Int_t iHit = 0; iHit < nHit; iHit++) {
-
- countHits++;
-
- AliTRDhit *hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit);
- Float_t pos[3];
- pos[0] = hit->fX;
- pos[1] = hit->fY;
- pos[2] = hit->fZ;
- Float_t q = hit->GetCharge();
- Int_t track = hit->fTrack;
- Int_t detector = hit->GetDetector();
- Int_t plane = fGeo->GetPlane(detector);
- Int_t sector = fGeo->GetSector(detector);
- Int_t chamber = fGeo->GetChamber(detector);
-
- if ((sector != iSect) ||
- (plane != iPlan) ||
- (chamber != iCham))
- continue;
-
- // Rotate the sectors on top of each other
- Float_t rot[3];
- fGeo->Rotate(detector,pos,rot);
-
- // The hit position in pad coordinates (center pad)
- // The pad row (z-direction)
- Int_t rowH = (Int_t) ((rot[2] - row0) / rowPadSize);
- // The pad column (rphi-direction)
- Int_t colH = (Int_t) ((rot[1] - col0) / colPadSize);
- // The time bucket
- Int_t timeH = (Int_t) ((rot[0] - time0) / timeBinSize);
-
- // Array to sum up the signal in a box surrounding the
- // hit postition
- const Int_t kTimeBox = 7;
- const Int_t kColBox = 9;
- const Int_t kRowBox = 7;
- Float_t signalSum[kRowBox][kColBox][kTimeBox];
- for (iRow = 0; iRow < kRowBox; iRow++ ) {
- for (iCol = 0; iCol < kColBox; iCol++ ) {
- for (iTime = 0; iTime < kTimeBox; iTime++) {
- signalSum[iRow][iCol][iTime] = 0;
- }
- }
+ // Loop through the TRD hits
+ for (Int_t iHit = 0; iHit < nHit; iHit++) {
+
+ countHits++;
+
+ AliTRDhit *hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit);
+ pos[0] = hit->X();
+ pos[1] = hit->Y();
+ pos[2] = hit->Z();
+ Float_t q = hit->GetCharge();
+ Int_t track = hit->Track();
+ Int_t detector = hit->GetDetector();
+ Int_t plane = fGeo->GetPlane(detector);
+ Int_t sector = fGeo->GetSector(detector);
+ Int_t chamber = fGeo->GetChamber(detector);
+
+ if (!(CheckDetector(plane,chamber,sector))) continue;
+
+ Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
+ Int_t nColMax = fGeo->GetColMax(plane);
+ Int_t nTimeMax = fGeo->GetTimeMax();
+ Int_t nTimeBefore = fGeo->GetTimeBefore();
+ Int_t nTimeAfter = fGeo->GetTimeAfter();
+ Int_t nTimeTotal = fGeo->GetTimeTotal();
+ Float_t row0 = fGeo->GetRow0(plane,chamber,sector);
+ Float_t col0 = fGeo->GetCol0(plane);
+ Float_t time0 = fGeo->GetTime0(plane);
+ Float_t rowPadSize = fGeo->GetRowPadSize(plane,chamber,sector);
+ Float_t colPadSize = fGeo->GetColPadSize(plane);
+ Float_t timeBinSize = fGeo->GetTimeBinSize();
+ Float_t divideRow = 1.0 / rowPadSize;
+ Float_t divideCol = 1.0 / colPadSize;
+ Float_t divideTime = 1.0 / timeBinSize;
+
+ if (fVerbose > 1) {
+ printf("Analyze hit no. %d ",iHit);
+ printf("-----------------------------------------------------------\n");
+ hit->Dump();
+ printf("plane = %d, sector = %d, chamber = %d\n"
+ ,plane,sector,chamber);
+ printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n"
+ ,nRowMax,nColMax,nTimeMax);
+ printf("nTimeBefore = %d, nTimeAfter = %d, nTimeTotal = %d\n"
+ ,nTimeBefore,nTimeAfter,nTimeTotal);
+ printf("row0 = %f, col0 = %f, time0 = %f\n"
+ ,row0,col0,time0);
+ printf("rowPadSize = %f, colPadSize = %f, timeBinSize = %f\n"
+ ,rowPadSize,colPadSize,timeBinSize);
+ }
+
+ // Don't analyze test hits
+ if (hit->FromTest()) continue;
+
+ if (detector != detectorOld) {
+
+ if (fVerbose > 1) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Get new container. New det = %d, Old det = %d\n"
+ ,detector,detectorOld);
+ }
+ // Compress the old one if enabled
+ if ((fCompress) && (detectorOld > -1)) {
+ if (fVerbose > 1) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Compress the old container ...");
+ }
+ signals->Compress(1,0);
+ for (iDict = 0; iDict < kNDict; iDict++) {
+ dictionary[iDict]->Compress(1,0);
+ }
+ if (fVerbose > 1) printf("done\n");
+ }
+ // Get the new container
+ signals = (AliTRDdataArrayF *) signalsArray->At(detector);
+ if (signals->GetNtime() == 0) {
+ // Allocate a new one if not yet existing
+ if (fVerbose > 1) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Allocate a new container ... ");
+ }
+ signals->Allocate(nRowMax,nColMax,nTimeTotal);
+ }
+ else {
+ // Expand an existing one
+ if (fCompress) {
+ if (fVerbose > 1) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Expand an existing container ... ");
}
+ signals->Expand();
+ }
+ }
+ // The same for the dictionary
+ for (iDict = 0; iDict < kNDict; iDict++) {
+ dictionary[iDict] = fDigits->GetDictionary(detector,iDict);
+ if (dictionary[iDict]->GetNtime() == 0) {
+ dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
+ }
+ else {
+ if (fCompress) dictionary[iDict]->Expand();
+ }
+ }
+ if (fVerbose > 1) printf("done\n");
+ detectorOld = detector;
+ }
- // Loop over all electrons of this hit
- Int_t nEl = (Int_t) q;
- for (Int_t iEl = 0; iEl < nEl; iEl++) {
-
- // The driftlength
- Float_t driftlength = rot[0] - time0;
- if ((driftlength < 0) ||
- (driftlength > kDrThick)) break;
- Float_t driftlengthL = driftlength;
- if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor);
- Float_t xyz[3];
- xyz[0] = rot[0];
- xyz[1] = rot[1];
- xyz[2] = rot[2];
-
- // Electron attachment
- if (fElAttachOn) {
- if (gRandom->Rndm() < (driftlengthL * fElAttachProp / 100.)) continue;
- }
+ // Rotate the sectors on top of each other
+ fGeo->Rotate(detector,pos,rot);
+
+ // The driftlength. It is negative if the hit is in the
+ // amplification region.
+ Float_t driftlength = time0 - rot[0];
+
+ // Take also the drift in the amplification region into account
+ // The drift length is at the moment still the same, regardless of
+ // the position relativ to the wire. This non-isochronity needs still
+ // to be implemented.
+ Float_t driftlengthL = TMath::Abs(driftlength + kAmWidth);
+ if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor);
+
+ // Loop over all electrons of this hit
+ // TR photons produce hits with negative charge
+ Int_t nEl = ((Int_t) TMath::Abs(q));
+ for (Int_t iEl = 0; iEl < nEl; iEl++) {
+
+ xyz[0] = rot[0];
+ xyz[1] = rot[1];
+ xyz[2] = rot[2];
+
+ // Electron attachment
+ if (fElAttachOn) {
+ if (gRandom->Rndm() < (driftlengthL * elAttachProp))
+ continue;
+ }
+
+ // Apply the diffusion smearing
+ if (fDiffusionOn) {
+ if (!(Diffusion(driftlengthL,xyz))) continue;
+ }
- // Apply the diffusion smearing
- if (fDiffusionOn) {
- if (!(Diffusion(driftlengthL,xyz))) continue;
- }
+ // Apply E x B effects (depends on drift direction)
+ if (fExBOn) {
+ if (!(ExB(driftlength+kAmWidth,xyz))) continue;
+ }
- // Apply E x B effects
- if (fExBOn) {
- if (!(ExB(driftlength,xyz))) continue;
- }
+ // The electron position after diffusion and ExB in pad coordinates
+ // The pad row (z-direction)
+ Int_t rowE = ((Int_t) ((xyz[2] - row0) * divideRow));
+ if ((rowE < 0) || (rowE >= nRowMax)) continue;
+
+ // The pad column (rphi-direction)
+ Int_t colE = ((Int_t) ((xyz[1] - col0) * divideCol));
+ if ((colE < 0) || (colE >= nColMax)) continue;
+
+ // The time bin (negative for hits in the amplification region)
+ // In the amplification region the electrons drift from both sides
+ // to the middle (anode wire plane)
+ Float_t timeDist = time0 - xyz[0];
+ Float_t timeOffset = 0;
+ Int_t timeE = 0;
+ if (timeDist > 0) {
+ // The time bin
+ timeE = ((Int_t) (timeDist * divideTime));
+ // The distance of the position to the middle of the timebin
+ timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) - timeDist;
+ }
+ else {
+ // Difference between half of the amplification gap width and
+ // the distance to the anode wire
+ Float_t anodeDist = kAmWidth - TMath::Abs(timeDist + kAmWidth);
+ // The time bin
+ timeE = -1 * (((Int_t ) (anodeDist * divideTime)) + 1);
+ // The distance of the position to the middle of the timebin
+ timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) + anodeDist;
+ }
+
+ // Apply the gas gain including fluctuations
+ Float_t ggRndm = 0.0;
+ do {
+ ggRndm = gRandom->Rndm();
+ } while (ggRndm <= 0);
+ Int_t signal = (Int_t) (-fGasGain * TMath::Log(ggRndm));
+
+ // Apply the pad response
+ if (fPRFOn) {
+ // The distance of the electron to the center of the pad
+ // in units of pad width
+ Float_t dist = (xyz[1] - col0 - (colE + 0.5) * colPadSize)
+ * divideCol;
+ if (!(PadResponse(signal,dist,padSignal))) continue;
+ }
+ else {
+ padSignal[0] = 0.0;
+ padSignal[1] = signal;
+ padSignal[2] = 0.0;
+ }
- // 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] - row0) / rowPadSize);
- Int_t rowD = rowH - rowE;
- // The pad column (rphi-direction)
- Int_t colE = (Int_t) ((xyz[1] - col0) / colPadSize);
- Int_t colD = colH - colE;
- // The time bucket
- Int_t timeE = (Int_t) ((xyz[0] - time0) / timeBinSize);
- 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] - col0 - (colE + 0.5) * colPadSize)
- / colPadSize;
-
- // Sum up the signal in the different pixels
- // and apply the pad response
- Int_t rowIdx = rowD + (Int_t) ( kRowBox / 2);
- Int_t colIdx = colD + (Int_t) ( kColBox / 2);
- Int_t timeIdx = timeD + (Int_t) (kTimeBox / 2);
-
- if (( rowIdx < 0) || ( rowIdx > kRowBox)) {
- printf("AliTRDdigitizer::MakeDigits -- ");
- printf("Boundary error. rowIdx = %d (%d)\n", rowIdx, kRowBox);
- continue;
- }
- if (( colIdx < 0) || ( colIdx > kColBox)) {
- printf("AliTRDdigitizer::MakeDigits -- ");
- printf("Boundary error. colIdx = %d (%d)\n", colIdx, kColBox);
- continue;
- }
- if ((timeIdx < 0) || (timeIdx > kTimeBox)) {
- printf("AliTRDdigitizer::MakeDigits -- ");
- printf("Boundary error. timeIdx = %d (%d)\n",timeIdx,kTimeBox);
- continue;
- }
- signalSum[rowIdx][colIdx-1][timeIdx] += fPRF->Eval(dist-1.0,0,0) * signal;
- signalSum[rowIdx][colIdx ][timeIdx] += fPRF->Eval(dist ,0,0) * signal;
- signalSum[rowIdx][colIdx+1][timeIdx] += fPRF->Eval(dist+1.0,0,0) * signal;
+ // Sample the time response inside the drift region
+ // + additional time bins before and after.
+ // The sampling is done always in the middle of the time bin
+ for (Int_t iTimeBin = TMath::Max(timeE-timeTRDbeg, -nTimeBefore)
+ ;iTimeBin < TMath::Min(timeE+timeTRDend,nTimeMax+nTimeAfter )
+ ;iTimeBin++) {
+
+ // Apply the time response
+ Float_t timeResponse = 1.0;
+ if (fTRFOn) {
+ Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset;
+ timeResponse = TimeResponse(time);
+ }
+ signalOld[0] = 0.0;
+ signalOld[1] = 0.0;
+ signalOld[2] = 0.0;
+
+ for (iPad = 0; iPad < kNpad; iPad++) {
+
+ Int_t colPos = colE + iPad - 1;
+ if (colPos < 0) continue;
+ if (colPos >= nColMax) break;
+
+ // Add the signals
+ // Note: The time bin number is shifted by nTimeBefore to avoid negative
+ // time bins. This has to be subtracted later.
+ Int_t iCurrentTimeBin = iTimeBin + nTimeBefore;
+ signalOld[iPad] = signals->GetDataUnchecked(rowE,colPos,iCurrentTimeBin);
+ signalOld[iPad] += padSignal[iPad] * timeResponse;
+ signals->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,signalOld[iPad]);
+
+ // Store the track index in the dictionary
+ // Note: We store index+1 in order to allow the array to be compressed
+ if (signalOld[iPad] > 0) {
+ for (iDict = 0; iDict < kNDict; iDict++) {
+ Int_t oldTrack = dictionary[iDict]->GetDataUnchecked(rowE
+ ,colPos
+ ,iCurrentTimeBin);
+ if (oldTrack == track+1) break;
+ if (oldTrack == 0) {
+ dictionary[iDict]->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,track+1);
+ break;
+ }
+ }
}
- // Add the padcluster to the detector matrix
- for (iRow = 0; iRow < kRowBox; iRow++ ) {
- for (iCol = 0; iCol < kColBox; iCol++ ) {
- for (iTime = 0; iTime < kTimeBox; iTime++) {
-
- Int_t rowB = rowH + iRow - (Int_t) ( kRowBox / 2);
- Int_t colB = colH + iCol - (Int_t) ( kColBox / 2);
- Int_t timeB = timeH + iTime - (Int_t) (kTimeBox / 2);
- Float_t signalB = signalSum[iRow][iCol][iTime];
- if (( rowB < 0) || ( rowB >= nRowMax)) continue;
- if (( colB < 0) || ( colB >= nColMax)) continue;
- if ((timeB < 0) || (timeB >= nTimeMax)) continue;
- if (signalB > 0.0) {
-
- // Add the signal sum
- signalB += signal->GetData(rowB,colB,timeB);
- signal->SetData(rowB,colB,timeB,signalB);
- // Store the track index in the dictionary
- // Note: We store index+1 in order to allow the array to be compressed
- for (iDict = 0; iDict < kNDict; iDict++) {
- Int_t oldTrack = tracks[iDict]->GetData(rowB,colB,timeB);
- if (oldTrack == track+1) break;
- if (oldTrack == -1) break;
- if (oldTrack == 0) {
- tracks[iDict]->SetData(rowB,colB,timeB,track+1);
- break;
- }
- }
- if (iDict == kNDict) {
- printf("AliTRDdigitizer::MakeDigits -- ");
- printf("More than three tracks for one digit!\n");
- }
- }
-
- }
- }
- }
+ }
- }
+ }
- }
+ }
- // Add a container for the digits of this detector
- digits = fDigits->GetDigits(iDet);
- // Allocate memory space for the digits buffer
- digits->Allocate(nRowMax,nColMax,nTimeMax);
+ }
- // Do the same for the dictionary arrays
- for (iDict = 0; iDict < kNDict; iDict++) {
- dictionary[iDict] = fDigits->GetDictionary(iDet,iDict);
- dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeMax);
- }
+ } // All hits finished
- // Create the digits for this chamber
- for (iRow = 0; iRow < nRowMax; iRow++ ) {
- for (iCol = 0; iCol < nColMax; iCol++ ) {
- for (iTime = 0; iTime < nTimeMax; iTime++) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Finished analyzing %d hits\n",countHits);
- Float_t signalAmp = signal->GetData(iRow,iCol,iTime);
+ // The total conversion factor
+ Float_t convert = kEl2fC * fPadCoupling * fTimeCoupling * fChipGain;
- // Add the noise
- signalAmp = TMath::Max((Float_t) gRandom->Gaus(signalAmp,fNoise)
- ,(Float_t) 0.0);
- // Convert to fC
- signalAmp *= kEl2fC;
- // Convert to mV
- signalAmp *= fChipGain;
- // Convert to ADC counts
- Int_t adc = (Int_t) (signalAmp * (fADCoutRange / fADCinRange));
+ // Loop through all chambers to finalize the digits
+ for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
- if (adc > fADCthreshold) {
+ Int_t plane = fGeo->GetPlane(iDet);
+ Int_t sector = fGeo->GetSector(iDet);
+ Int_t chamber = fGeo->GetChamber(iDet);
+ Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
+ Int_t nColMax = fGeo->GetColMax(plane);
+ Int_t nTimeMax = fGeo->GetTimeMax();
+ Int_t nTimeTotal = fGeo->GetTimeTotal();
- nDigits++;
+ if (fVerbose > 0) {
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Digitization for chamber %d\n",iDet);
+ }
- // Store the amplitude of the digit
- digits->SetData(iRow,iCol,iTime,adc);
+ // Add a container for the digits of this detector
+ digits = fDigits->GetDigits(iDet);
+ // Allocate memory space for the digits buffer
+ digits->Allocate(nRowMax,nColMax,nTimeTotal);
- // Store the track index in the dictionary
- // Note: We store index+1 in order to allow the array to be compressed
- for (iDict = 0; iDict < kNDict; iDict++) {
- dictionary[iDict]->SetData(iRow,iCol,iTime
- ,tracks[iDict]->GetData(iRow,iCol,iTime));
- }
+ // Get the signal container
+ signals = (AliTRDdataArrayF *) signalsArray->At(iDet);
+ if (signals->GetNtime() == 0) {
+ // Create missing containers
+ signals->Allocate(nRowMax,nColMax,nTimeTotal);
+ }
+ else {
+ // Expand the container if neccessary
+ if (fCompress) signals->Expand();
+ }
+ // Create the missing dictionary containers
+ for (iDict = 0; iDict < kNDict; iDict++) {
+ dictionary[iDict] = fDigits->GetDictionary(iDet,iDict);
+ if (dictionary[iDict]->GetNtime() == 0) {
+ dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
+ }
+ }
+
+ Int_t nDigits = 0;
+
+ // Don't create noise in detectors that are switched off
+ if (CheckDetector(plane,chamber,sector)) {
+ // Create the digits for this chamber
+ for (iRow = 0; iRow < nRowMax; iRow++ ) {
+ for (iCol = 0; iCol < nColMax; iCol++ ) {
+ for (iTime = 0; iTime < nTimeTotal; iTime++) {
+
+ // Create summable digits
+ if (fSDigits) {
+
+ Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
+ Int_t adc = 0;
+ if (signalAmp >= fSinRange) {
+ adc = ((Int_t) fSoutRange);
+ }
+ else {
+ adc = ((Int_t) (signalAmp * (fSoutRange / fSinRange)));
}
+ nDigits++;
+ digits->SetDataUnchecked(iRow,iCol,iTime,adc);
}
- }
- }
+ // Create normal digits
+ else {
- // Compress the arrays
- digits->Compress(1,0);
- for (iDict = 0; iDict < kNDict; iDict++) {
- dictionary[iDict]->Compress(1,0);
- }
+ Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
- totalSizeDigits += digits->GetSize();
- totalSizeDict0 += dictionary[0]->GetSize();
- totalSizeDict1 += dictionary[1]->GetSize();
- totalSizeDict2 += dictionary[2]->GetSize();
+ // Add the noise
+ signalAmp = TMath::Max((Double_t) gRandom->Gaus(signalAmp,fNoise),0.0);
+ // Convert to mV
+ signalAmp *= convert;
+ // Convert to ADC counts. Set the overflow-bit fADCoutRange if the
+ // signal is larger than fADCinRange
+ Int_t adc = 0;
+ if (signalAmp >= fADCinRange) {
+ adc = ((Int_t) fADCoutRange);
+ }
+ else {
+ adc = ((Int_t) (signalAmp * (fADCoutRange / fADCinRange)));
+ }
- printf("AliTRDdigitizer::MakeDigits -- ");
- printf("Number of digits found: %d.\n",nDigits);
-
- // Reset the arrays
- signal->Reset();
- for (iDict = 0; iDict < kNDict; iDict++) {
- tracks[iDict]->Reset();
- }
+ // Store the amplitude of the digit if above threshold
+ if (adc > fADCthreshold) {
+ if (fVerbose > 2) {
+ printf(" iRow = %d, iCol = %d, iTime = %d\n"
+ ,iRow,iCol,iTime);
+ printf(" signal = %f, adc = %d\n",signalAmp,adc);
+ }
+ nDigits++;
+ digits->SetDataUnchecked(iRow,iCol,iTime,adc);
+ }
+ }
+
+ }
+ }
}
+
}
+
+ // Compress the arrays
+ digits->Compress(1,0);
+ for (iDict = 0; iDict < kNDict; iDict++) {
+ dictionary[iDict]->Compress(1,0);
+ }
+
+ totalSizeDigits += digits->GetSize();
+ totalSizeDict0 += dictionary[0]->GetSize();
+ totalSizeDict1 += dictionary[1]->GetSize();
+ totalSizeDict2 += dictionary[2]->GetSize();
+
+ Float_t nPixel = nRowMax * nColMax * nTimeMax;
+ printf("AliTRDdigitizer::MakeDigits -- ");
+ printf("Found %d digits in detector %d (%3.0f).\n"
+ ,nDigits,iDet
+ ,100.0 * ((Float_t) nDigits) / nPixel);
+
+ if (fCompress) signals->Compress(1,0);
+
}
printf("AliTRDdigitizer::MakeDigits -- ");
}
+//_____________________________________________________________________________
+Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector)
+{
+ //
+ // Checks whether a detector is enabled
+ //
+
+ if ((fTRD->GetSensChamber() >= 0) &&
+ (fTRD->GetSensChamber() != chamber)) return kFALSE;
+ if ((fTRD->GetSensPlane() >= 0) &&
+ (fTRD->GetSensPlane() != plane)) return kFALSE;
+ if ( fTRD->GetSensSector() >= 0) {
+ Int_t sens1 = fTRD->GetSensSector();
+ Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
+ sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
+ * AliTRDgeometry::Nsect();
+ if (sens1 < sens2) {
+ if ((sector < sens1) || (sector >= sens2)) return kFALSE;
+ }
+ else {
+ if ((sector < sens1) && (sector >= sens2)) return kFALSE;
+ }
+ }
+
+ return kTRUE;
+
+}
+
//_____________________________________________________________________________
Bool_t AliTRDdigitizer::WriteDigits()
{
// Create the branches
if (!(gAlice->TreeD()->GetBranch("TRDdigits"))) {
- if (!fDigits->MakeBranch()) return kFALSE;
+ return kFALSE;
}
// Store the digits and the dictionary in the tree
fDigits->WriteDigits();
// Write the new tree into the input file (use overwrite option)
- Char_t treeName[7];
+ Char_t treeName[15];
sprintf(treeName,"TreeD%d",fEvent);
printf("AliTRDdigitizer::WriteDigits -- ");
printf("Write the digits tree %s for event %d.\n"
,treeName,fEvent);
- gAlice->TreeD()->Write(treeName,2);
+ gAlice->TreeD()->Write(treeName,TObject::kOverwrite);
return kTRUE;
}
+
+//_____________________________________________________________________________
+Float_t AliTRDdigitizer::GetDiffusionL(Float_t vd, Float_t b)
+{
+ //
+ // Returns the longitudinal diffusion coefficient for a given drift
+ // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
+ // The values are according to a GARFIELD simulation.
+ //
+
+ const Int_t kNb = 5;
+ Float_t p0[kNb] = { 0.007440, 0.007493, 0.007513, 0.007672, 0.007831 };
+ Float_t p1[kNb] = { 0.019252, 0.018912, 0.018636, 0.018012, 0.017343 };
+ Float_t p2[kNb] = { -0.005042, -0.004926, -0.004867, -0.004650, -0.004424 };
+ Float_t p3[kNb] = { 0.000195, 0.000189, 0.000195, 0.000182, 0.000169 };
+
+ Int_t ib = ((Int_t) (10 * (b - 0.15)));
+ ib = TMath::Max( 0,ib);
+ ib = TMath::Min(kNb,ib);
+
+ Float_t diff = p0[ib]
+ + p1[ib] * vd
+ + p2[ib] * vd*vd
+ + p3[ib] * vd*vd*vd;
+
+ return diff;
+
+}
+
+//_____________________________________________________________________________
+Float_t AliTRDdigitizer::GetDiffusionT(Float_t vd, Float_t b)
+{
+ //
+ // Returns the transverse diffusion coefficient for a given drift
+ // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
+ // The values are according to a GARFIELD simulation.
+ //
+
+ const Int_t kNb = 5;
+ Float_t p0[kNb] = { 0.009550, 0.009599, 0.009674, 0.009757, 0.009850 };
+ Float_t p1[kNb] = { 0.006667, 0.006539, 0.006359, 0.006153, 0.005925 };
+ Float_t p2[kNb] = { -0.000853, -0.000798, -0.000721, -0.000635, -0.000541 };
+ Float_t p3[kNb] = { 0.000131, 0.000122, 0.000111, 0.000098, 0.000085 };
+
+ Int_t ib = ((Int_t) (10 * (b - 0.15)));
+ ib = TMath::Max( 0,ib);
+ ib = TMath::Min(kNb,ib);
+
+ Float_t diff = p0[ib]
+ + p1[ib] * vd
+ + p2[ib] * vd*vd
+ + p3[ib] * vd*vd*vd;
+
+ return diff;
+
+}
+
+//_____________________________________________________________________________
+Float_t AliTRDdigitizer::GetOmegaTau(Float_t vd, Float_t b)
+{
+ //
+ // Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd>
+ // and a B-field <b> for Xe/CO2 (15%).
+ // The values are according to a GARFIELD simulation.
+ //
+
+ const Int_t kNb = 5;
+ Float_t p0[kNb] = { 0.004810, 0.007412, 0.010252, 0.013409, 0.016888 };
+ Float_t p1[kNb] = { 0.054875, 0.081534, 0.107333, 0.131983, 0.155455 };
+ Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 };
+ Float_t p3[kNb] = { 0.000155, 0.000238, 0.000330, 0.000428, 0.000541 };
+
+ Int_t ib = ((Int_t) (10 * (b - 0.15)));
+ ib = TMath::Max( 0,ib);
+ ib = TMath::Min(kNb,ib);
+
+ Float_t alphaL = p0[ib]
+ + p1[ib] * vd
+ + p2[ib] * vd*vd
+ + p3[ib] * vd*vd*vd;
+
+ return TMath::Tan(alphaL);
+
+}
+
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff