/**************************************************************************
* 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. *
**************************************************************************/
/* $Id$ */
//_________________________________________________________________________
// Implementation version v0 of PHOS Manager class
// Layout EMC + PPSD has name GPS2
// The main goal of this version of AliPHOS is to calculte the
// induced charged in the PIN diode, taking into account light
// tracking in the PbWO4 crystal, induced signal in the
// PIN due to MIPS particle and electronic noise.
// This is done in the StepManager
//
//*-- Author: Odd Harald Oddland & Gines Martinez (SUBATECH)
// --- ROOT system ---
#include "TRandom.h"
// --- Standard library ---
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <strstream.h>
// --- AliRoot header files ---
#include "AliPHOSv3.h"
#include "AliPHOSHit.h"
#include "AliPHOSCPVDigit.h"
#include "AliRun.h"
#include "AliConst.h"
#include "AliMC.h"
#include "AliPHOSGeometry.h"
ClassImp(AliPHOSv3)
//____________________________________________________________________________
AliPHOSv3::AliPHOSv3(const char *name, const char *title):
AliPHOSv1(name,title)
{
// ctor
// Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using
// following formula
// NumberOfElectrons = EnergyLost * LightYield * PINEfficiency *
// exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) *
// RecalibrationFactor ;
// LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko
// PINEfficiency is 0.1875 from Odd Harald Odland work
// k_0 is 0.0045 from Valery Antonenko
fLightYieldMean = 700000. ;
fIntrinsicPINEfficiency = 0.1875 ;
fLightYieldAttenuation = 0.0045 ;
fRecalibrationFactor = 6.2 / fLightYieldMean ;
fElectronsPerGeV = 2.77e+8 ;
}
// //____________________________________________________________________________
// AliPHOSv3::AliPHOSv3(AliPHOSReconstructioner * Reconstructioner, const char *name, const char *title):
// AliPHOSv1(Reconstructioner,name,title)
// {
// // ctor
// // Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using
// // following formula
// // NumberOfElectrons = EnergyLost * LightYield * PINEfficiency *
// // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) *
// // RecalibrationFactor ;
// // LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko
// // PINEfficiency is 0.1875 from Odd Harald Odland work
// // k_0 is 0.0045 from Valery Antonenko
// fLightYieldMean = 700000.;
// fIntrinsicPINEfficiency = 0.1875 ;
// fLightYieldAttenuation = 0.0045 ;
// fRecalibrationFactor = 6.2 / fLightYieldMean ;
// fElectronsPerGeV = 2.77e+8 ;
// }
//____________________________________________________________________________
void AliPHOSv3::StepManager(void)
{
// Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell
// if (gMC->IsTrackEntering())
// cout << "Track enters the volume " << gMC->CurrentVolName() << endl;
// if (gMC->IsTrackExiting())
// cout << "Track leaves the volume " << gMC->CurrentVolName() << endl;
Int_t relid[4] ; // (box, layer, row, column) indices
Int_t absid ; // absolute cell ID number
Float_t xyze[4]={0,0,0,0} ; // position wrt MRS and energy deposited
TLorentzVector pos ; // Lorentz vector of the track current position
Int_t copy ;
Int_t tracknumber = gAlice->CurrentTrack() ;
Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
TString name = fGeom->GetName() ;
if ( name == "GPS2" || name == "MIXT" ) { // ======> CPV is a GPS' PPSD
if( gMC->CurrentVolID(copy) == gMC->VolId("GCEL") ) // We are inside a gas cell
{
gMC->TrackPosition(pos) ;
xyze[0] = pos[0] ;
xyze[1] = pos[1] ;
xyze[2] = pos[2] ;
xyze[3] = gMC->Edep() ;
if ( xyze[3] != 0) { // there is deposited energy
gMC->CurrentVolOffID(5, relid[0]) ; // get the PHOS Module number
if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(5),"PHO1") == 0 ){
relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
}
gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number
// 1-> fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() upper
// > fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() lower
gMC->CurrentVolOffID(1, relid[2]) ; // get the row number of the cell
gMC->CurrentVolID(relid[3]) ; // get the column number
// get the absolute Id number
fGeom->RelToAbsNumbering(relid, absid) ;
// add current hit to the hit list
AddHit(fIshunt, primary, tracknumber, absid, xyze);
} // there is deposited energy
} // We are inside the gas of the CPV
} // GPS2 configuration
if ( name == "IHEP" || name == "MIXT" ) { // ======> CPV is a IHEP's one
// Yuri Kharlov, 28 September 2000
if( gMC->CurrentVolID(copy) == gMC->VolId("CPVQ") &&
gMC->IsTrackEntering() &&
gMC->TrackCharge() != 0) {
gMC -> TrackPosition(pos);
Float_t xyzm[3], xyzd[3] ;
Int_t i;
for (i=0; i<3; i++) xyzm[i] = pos[i];
gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
Float_t xyd[3]={0,0,0} ; //local posiiton of the entering
xyd[0] = xyzd[0];
xyd[1] =-xyzd[1];
xyd[2] =-xyzd[2];
// Current momentum of the hit's track in the local ref. system
TLorentzVector pmom ; //momentum of the particle initiated hit
gMC -> TrackMomentum(pmom);
Float_t pm[3], pd[3];
for (i=0; i<3; i++) pm[i] = pmom[i];
gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
pmom[0] = pd[0];
pmom[1] =-pd[1];
pmom[2] =-pd[2];
// Digitize the current CPV hit:
// 1. find pad response and
Int_t moduleNumber;
gMC->CurrentVolOffID(3,moduleNumber);
moduleNumber--;
TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
CPVDigitize(pmom,xyd,moduleNumber,cpvDigits);
Float_t xmean = 0;
Float_t zmean = 0;
Float_t qsum = 0;
Int_t idigit,ndigits;
// 2. go through the current digit list and sum digits in pads
ndigits = cpvDigits->GetEntriesFast();
for (idigit=0; idigit<ndigits-1; idigit++) {
AliPHOSCPVDigit *cpvDigit1 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
Float_t x1 = cpvDigit1->GetXpad() ;
Float_t z1 = cpvDigit1->GetYpad() ;
for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
AliPHOSCPVDigit *cpvDigit2 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(jdigit);
Float_t x2 = cpvDigit2->GetXpad() ;
Float_t z2 = cpvDigit2->GetYpad() ;
if (x1==x2 && z1==z2) {
Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
cpvDigit2->SetQpad(qsum) ;
cpvDigits->RemoveAt(idigit) ;
}
}
}
cpvDigits->Compress() ;
// 3. add digits to temporary hit list fTmpHits
ndigits = cpvDigits->GetEntriesFast();
for (idigit=0; idigit<ndigits; idigit++) {
AliPHOSCPVDigit *cpvDigit = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number
relid[1] =-1 ; // means CPV
relid[2] = cpvDigit->GetXpad() ; // column number of a pad
relid[3] = cpvDigit->GetYpad() ; // row number of a pad
// get the absolute Id number
fGeom->RelToAbsNumbering(relid, absid) ;
// add current digit to the temporary hit list
xyze[0] = 0. ;
xyze[1] = 0. ;
xyze[2] = 0. ;
xyze[3] = cpvDigit->GetQpad() ; // amplitude in a pad
primary = -1; // No need in primary for CPV
AddHit(fIshunt, primary, tracknumber, absid, xyze);
if (cpvDigit->GetQpad() > 0.02) {
xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
qsum += cpvDigit->GetQpad();
}
}
delete cpvDigits;
}
} // end of IHEP configuration
if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
gMC->TrackPosition(pos) ;
xyze[0] = pos[0] ;
xyze[1] = pos[1] ;
xyze[2] = pos[2] ;
xyze[3] = gMC->Edep() ;
if ( (xyze[3] != 0) ) { // Track is inside the crystal and deposits some energy
gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ;
if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(10),"PHO1") == 0 )
relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
relid[1] = 0 ; // means PBW04
gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module
gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module
// get the absolute Id number
fGeom->RelToAbsNumbering(relid, absid) ;
// add current hit to the hit list
AddHit(fIshunt, primary,tracknumber, absid, xyze);
} // there is deposited energy
} // we are inside a PHOS Xtal
if(gMC->CurrentVolID(copy) == gMC->VolId("PPIN") ) // We are inside de PIN diode
{
gMC->TrackPosition(pos) ;
xyze[0] = pos[0] ;
xyze[1] = pos[1] ;
xyze[2] = pos[2] ;
Float_t lostenergy = gMC->Edep() ;
xyze[3] = gMC->Edep() ;
if ( xyze[3] != 0 ) {
gMC->CurrentVolOffID(11, relid[0]) ; // get the PHOS module number ;
relid[1] = 0 ; // means PW04 and PIN
gMC->CurrentVolOffID(5, relid[2]) ; // get the row number inside the module
gMC->CurrentVolOffID(4, relid[3]) ; // get the cell number inside the module
// get the absolute Id number
Int_t absid ;
fGeom->RelToAbsNumbering(relid,absid) ;
// calculating number of electrons in the PIN diode asociated to this hit
Float_t nElectrons = lostenergy * fElectronsPerGeV ;
xyze[3] = nElectrons * fRecalibrationFactor ;
// add current hit to the hit list
AddHit(fIshunt, primary, tracknumber, absid, xyze);
//printf("PIN volume is %d, %d, %d, %d n",relid[0],relid[1],relid[2],relid[3]);
//printf("Lost energy in the PIN is %f n",lostenergy) ;
} // there is deposited energy
} // we are inside a PHOS XtalPHOS PIN diode
}
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