/**************************************************************************
* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
* *
* Author: The ALICE Off-line Project. *
* Contributors are mentioned in the code where appropriate. *
* *
* Permission to use, copy, modify and distribute this software and its *
* documentation strictly for non-commercial purposes is hereby granted *
* without fee, provided that the above copyright notice appears in all *
* copies and that both the copyright notice and this permission notice *
* appear in the supporting documentation. The authors make no claims *
* about the suitability of this software for any purpose. It is *
* provided "as is" without express or implied warranty. *
**************************************************************************/
/*
$Log$
Revision 1.21 2000/06/09 11:10:07 cblume
Compiler warnings and coding conventions, next round
Revision 1.20 2000/06/08 18:32:58 cblume
Make code compliant to coding conventions
Revision 1.19 2000/06/07 16:27:32 cblume
Try to remove compiler warnings on Sun and HP
Revision 1.18 2000/05/08 16:17:27 cblume
Merge TRD-develop
Revision 1.17.2.1 2000/05/08 14:59:16 cblume
Made inline function non-virtual. Bug fix in setting sensitive chamber
Revision 1.17 2000/02/28 19:10:26 cblume
Include the new TRD classes
Revision 1.16.4.1 2000/02/28 18:04:35 cblume
Change to new hit version, introduce geometry class, and move digitization and clustering to AliTRDdigitizer/AliTRDclusterizerV1
Revision 1.16 1999/11/05 22:50:28 fca
Do not use Atan, removed from ROOT too
Revision 1.15 1999/11/02 17:20:19 fca
initialise nbytes before using it
Revision 1.14 1999/11/02 17:15:54 fca
Correct ansi scoping not accepted by HP compilers
Revision 1.13 1999/11/02 17:14:51 fca
Correct ansi scoping not accepted by HP compilers
Revision 1.12 1999/11/02 16:35:56 fca
New version of TRD introduced
Revision 1.11 1999/11/01 20:41:51 fca
Added protections against using the wrong version of FRAME
Revision 1.10 1999/09/29 09:24:35 fca
Introduction of the Copyright and cvs Log
*/
///////////////////////////////////////////////////////////////////////////////
// //
// Transition Radiation Detector version 2 -- slow simulator //
// //
//Begin_Html
/*
*/
//End_Html
// //
// //
///////////////////////////////////////////////////////////////////////////////
#include
#include
#include
#include "AliRun.h"
#include "AliMC.h"
#include "AliConst.h"
#include "AliTRDv1.h"
#include "AliTRDmatrix.h"
#include "AliTRDgeometry.h"
ClassImp(AliTRDv1)
//_____________________________________________________________________________
AliTRDv1::AliTRDv1():AliTRD()
{
//
// Default constructor
//
fIdSens = 0;
fIdChamber1 = 0;
fIdChamber2 = 0;
fIdChamber3 = 0;
fSensSelect = 0;
fSensPlane = -1;
fSensChamber = -1;
fSensSector = -1;
fSensSectorRange = 0;
fDeltaE = NULL;
}
//_____________________________________________________________________________
AliTRDv1::AliTRDv1(const char *name, const char *title)
:AliTRD(name, title)
{
//
// Standard constructor for Transition Radiation Detector version 1
//
fIdSens = 0;
fIdChamber1 = 0;
fIdChamber2 = 0;
fIdChamber3 = 0;
fSensSelect = 0;
fSensPlane = -1;
fSensChamber = -1;
fSensSector = -1;
fSensSectorRange = 0;
fDeltaE = NULL;
SetBufferSize(128000);
}
//_____________________________________________________________________________
AliTRDv1::AliTRDv1(const AliTRDv1 &trd)
{
//
// Copy constructor
//
((AliTRDv1 &) trd).Copy(*this);
}
//_____________________________________________________________________________
AliTRDv1::~AliTRDv1()
{
//
// AliTRDv1 destructor
//
if (fDeltaE) delete fDeltaE;
}
//_____________________________________________________________________________
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).fIdSens = fIdSens;
((AliTRDv1 &) trd).fIdChamber1 = fIdChamber1;
((AliTRDv1 &) trd).fIdChamber2 = fIdChamber2;
((AliTRDv1 &) trd).fIdChamber3 = fIdChamber3;
((AliTRDv1 &) trd).fSensSelect = fSensSelect;
((AliTRDv1 &) trd).fSensPlane = fSensPlane;
((AliTRDv1 &) trd).fSensChamber = fSensChamber;
((AliTRDv1 &) trd).fSensSector = fSensSector;
((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange;
((AliTRDv1 &) trd).fDeltaE = NULL;
}
//_____________________________________________________________________________
void AliTRDv1::CreateGeometry()
{
//
// 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;
// Define the chambers
AliTRD::CreateGeometry();
}
//_____________________________________________________________________________
void AliTRDv1::CreateMaterials()
{
//
// Create materials for the Transition Radiation Detector version 1
//
AliTRD::CreateMaterials();
}
//_____________________________________________________________________________
void AliTRDv1::Init()
{
//
// Initialise Transition Radiation Detector after geometry has been built.
//
AliTRD::Init();
printf(" Slow simulator\n\n");
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 / kNsect)) * kNsect;
printf(" Only sectors %d - %d are sensitive\n",sens1,sens2-1);
}
}
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");
for (Int_t i = 0; i < 80; i++) printf("*");
printf("\n");
}
//_____________________________________________________________________________
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)
//
if ((ichamber < 0) || (ichamber > 4)) {
printf("Wrong input value: %d\n",ichamber);
printf("Use standard setting\n");
fSensChamber = -1;
fSensSelect = 0;
return;
}
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
// (0-17) as the starting point and as the number
// of sectors to be included.
//
if ((isector < 0) || (isector > 17)) {
printf("Wrong input value : %d\n",isector);
printf("Use standard setting\n");
fSensSector = -1;
fSensSectorRange = 0;
fSensSelect = 0;
return;
}
if ((nsector < 1) || (nsector > 18)) {
printf("Wrong input value : %d\n",nsector);
printf("Use standard setting\n");
fSensSector = -1;
fSensSectorRange = 0;
fSensSelect = 0;
return;
}
fSensSelect = 1;
fSensSector = isector;
fSensSectorRange = nsector;
}
//_____________________________________________________________________________
void AliTRDv1::StepManager()
{
//
// 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 pla = 0;
Int_t cha = 0;
Int_t sec = 0;
Int_t iPdg;
Int_t det[1];
Float_t hits[4];
Float_t random[1];
Float_t charge;
Float_t aMass;
Double_t pTot;
Double_t qTot;
Double_t eDelta;
Double_t betaGamma, pp;
TLorentzVector pos, mom;
TClonesArray &lhits = *fHits;
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;
// 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;
// PDG code electron
const Int_t kPdgElectron = 11;
// Set the maximum step size to a very large number for all
// neutral particles and those outside the driftvolume
gMC->SetMaxStep(kBig);
// Use only charged tracks
if (( gMC->TrackCharge() ) &&
(!gMC->IsTrackStop() ) &&
(!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);
// 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 (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 chamber number
// 0: outer left
// 1: middle left
// 2: inner
// 3: middle right
// 4: outer right
if (iIdChamber == fIdChamber1)
cha = (hits[2] < 0 ? 0 : 4);
else if (iIdChamber == fIdChamber2)
cha = (hits[2] < 0 ? 1 : 3);
else if (iIdChamber == fIdChamber3)
cha = 2;
// The plane number
// The numbering starts at the innermost plane
pla = icChamber - TMath::Nint((Float_t) (icChamber / 7)) * 6 - 1;
// 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 / kNsect)) * kNsect;
if (sens1 < sens2) {
if ((sec < sens1) || (sec >= sens2)) addthishit = 0;
}
else {
if ((sec < sens1) && (sec >= sens2)) addthishit = 0;
}
}
}
// Add this hit
if (addthishit) {
det[0] = fGeometry->GetDetector(pla,cha,sec);
new(lhits[fNhits++]) AliTRDhit(fIshunt
,gAlice->CurrentTrack()
,det
,hits);
// The energy loss according to Bethe Bloch
gMC->TrackMomentum(mom);
pTot = mom.Rho();
iPdg = TMath::Abs(gMC->TrackPid());
if ( (iPdg != kPdgElectron) ||
((iPdg == kPdgElectron) && (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
else {
pp = kPrim * kPlateau;
}
// 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);
}
}
else {
// set step size to maximal value
gMC->SetMaxStep(kBig);
}
}
}
}
//_____________________________________________________________________________
Double_t AliTRDv1::BetheBloch(Double_t bg)
{
//
// Parametrization of the Bethe-Bloch-curve
// The parametrization is the same as for the TPC and is taken from Lehrhaus.
//
// This parameters have been adjusted to averaged values from GEANT
const Double_t kP1 = 7.17960e-02;
const Double_t kP2 = 8.54196;
const Double_t kP3 = 1.38065e-06;
const Double_t kP4 = 5.30972;
const Double_t kP5 = 2.83798;
// 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;
if (bg > 0) {
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;
}
//_____________________________________________________________________________
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;
pos1 = pos2 - 1;
// Differentiate between the sampling points
dnde = (vye[pos1] - vye[pos2]) / (vxe[pos2] - vxe[pos1]);
return dnde;
}