ITS/AliITSCorrMapSDD.cxx

   1 /**************************************************************************
   2  * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 ///////////////////////////////////////////////////////////////////
  19 //                                                               //
  20 // Implementation of the base class for SDD map corrections      //
  21 // Origin: F.Prino, Torino, prino@to.infn.it                     //
  22 //                                                               //
  23 ///////////////////////////////////////////////////////////////////
  24
  25 #include "TH1F.h"
  26 #include "TH2F.h"
  27 #include "AliITSCorrMapSDD.h"
  28
  29 const Int_t AliITSCorrMapSDD::fgkNAnodePtsDefault = 1;
  30 const Int_t AliITSCorrMapSDD::fgkNDriftPtsDefault = 72;
  31
  32 ClassImp(AliITSCorrMapSDD)
  33 //______________________________________________________________________
  34 AliITSCorrMapSDD::AliITSCorrMapSDD():TNamed("defaultmap",""),
  35   fNAnodePts(fgkNAnodePtsDefault),
  36   fNDriftPts(fgkNDriftPtsDefault),
  37   fXt1(0.),
  38   fXt2(0.),
  39   fXm1(0.),
  40   fXm2(0.),
  41   fDrLen(0.)
  42 {
  43   // default constructor
  44 }
  45 //______________________________________________________________________
  46 AliITSCorrMapSDD::AliITSCorrMapSDD(Char_t *mapname):
  47   TNamed(mapname,""),
  48   fNAnodePts(fgkNAnodePtsDefault),
  49   fNDriftPts(fgkNDriftPtsDefault),
  50   fXt1(0.),
  51   fXt2(0.),
  52   fXm1(0.),
  53   fXm2(0.),
  54   fDrLen(0.)
  55 {
  56   // standard constructor
  57 }
  58 //______________________________________________________________________
  59 void AliITSCorrMapSDD::ComputeGridPoints(Float_t z, Float_t x, AliITSsegmentationSDD *seg, Bool_t isReco){
  60   // extracts points from the discrete grid with the correction map
  61
  62   const Double_t kMicronTocm = 1.0e-4;
  63   Int_t nAnodes=seg->Npz();
  64   Int_t nAnodesHybrid=seg->NpzHalf();
  65   Int_t bina =(Int_t) seg->GetAnodeFromLocal(x,z);
  66   if(bina>nAnodes)  AliError("Wrong anode anumber!");
  67   if(bina>=nAnodesHybrid) bina-=nAnodesHybrid;
  68   Float_t stept = seg->Dx()*kMicronTocm/(Float_t)fNDriftPts;
  69   fDrLen= seg->Dx()*kMicronTocm-TMath::Abs(x);
  70   if(fDrLen<0) fDrLen=0;
  71   Int_t bint = TMath::Abs((Int_t)(fDrLen/stept));
  72   if(bint==fNDriftPts) bint-=1;
  73   if(bint>=fNDriftPts){
  74     AliError("Wrong bin number along drift direction!");
  75     bint=fNDriftPts-1;
  76   }
  77   fXt1=stept*bint;
  78   fXm1=fXt1-GetCellContent(bina,bint)*kMicronTocm;
  79   if((bint+1)<fNDriftPts){
  80     fXt2=stept*(bint+1);
  81     fXm2=fXt2-GetCellContent(bina,bint+1)*kMicronTocm;
  82   }else{
  83     fXt2=stept*(bint-1);
  84     fXm2=fXt2-GetCellContent(bina,bint-1)*kMicronTocm;
  85   }
  86   if(isReco){
  87     if(fXm1<fDrLen && fXm2>fDrLen) return;
  88     if(bint==0 || bint==(fNDriftPts-1)) return;
  89     if(fXm1>fDrLen){
  90       for(Int_t itry=1; itry<=10; itry++){
  91         Float_t xmtest=(bint-itry)*stept-GetCellContent(bina,bint-itry)*kMicronTocm;
  92         if(xmtest<fDrLen){
  93           fXt1=stept*(bint-itry);
  94           fXt2=fXt1+stept;
  95           fXm1=fXt1-GetCellContent(bina,bint-itry)*kMicronTocm;
  96           fXm2=fXt2-GetCellContent(bina,bint+1-itry)*kMicronTocm;
  97           return;
  98         }
  99       }
 100     }
 101     if(fXm2<fDrLen){
 102       for(Int_t itry=1; itry<=10; itry++){
 103         Float_t xmtest=(bint+1+itry)*stept-GetCellContent(bina,bint+1+itry)*kMicronTocm;
 104         if(xmtest>fDrLen){
 105           fXt1=stept*(bint+itry);
 106           fXt2=fXt1+stept;
 107           fXm1=fXt1-GetCellContent(bina,bint+itry)*kMicronTocm;
 108           fXm2=fXt2-GetCellContent(bina,bint+1+itry)*kMicronTocm;
 109           return;
 110         }
 111       }
 112     }
 113   }
 114 }
 115 //______________________________________________________________________
 116 Float_t AliITSCorrMapSDD::GetCorrection(Float_t z, Float_t x, AliITSsegmentationSDD *seg){
 117   // returns correction in cm starting from local coordinates on the module
 118   ComputeGridPoints(z,x,seg,kTRUE);
 119   Float_t m=(fXt2-fXt1)/(fXm2-fXm1);
 120   Float_t q=fXt1-m*fXm1;
 121   Float_t xcorr=m*fDrLen+q;
 122   // fDrLen is the measured drift distance, xcorr is the corresponding true
 123   return GetInversionBit() ? fDrLen-xcorr : xcorr-fDrLen;
 124 }
 125 //______________________________________________________________________
 126 Float_t AliITSCorrMapSDD::GetShiftForSimulation(Float_t z, Float_t x, AliITSsegmentationSDD *seg){
 127   // returns shift to be appiled in digitizarion (in cm) starting from local coordinates on the module
 128   ComputeGridPoints(z,x,seg,kFALSE);
 129   Float_t m=(fXm2-fXm1)/(fXt2-fXt1);
 130   Float_t q=fXm1-m*fXt1;
 131   Float_t xshifted=m*fDrLen+q;
 132   // fDrLen is the true drift distance, xshifted is the one with map shift
 133   return GetInversionBit() ? xshifted-fDrLen : fDrLen-xshifted;
 134 }
 135 //______________________________________________________________________
 136 TH2F* AliITSCorrMapSDD::GetMapHisto() const{
 137   // Returns a TH2F histogram with map of residuals
 138   TString hname;
 139   hname.Form("h%s",GetName());
 140   TH2F* hmap=new TH2F(hname.Data(),"",fNAnodePts,-0.5,255.5,fNDriftPts,0.,35.);
 141   for(Int_t iAn=0;iAn<fNAnodePts; iAn++){
 142     for(Int_t iDr=0;iDr<fNDriftPts; iDr++){
 143       hmap->SetBinContent(iAn+1,iDr+1,GetCellContent(iAn,iDr));
 144     }
 145   }
 146   return hmap;
 147 }
 148 //______________________________________________________________________
 149 TH1F* AliITSCorrMapSDD::GetMapProfile() const{
 150   // Returns a TH1F with the projection of the map along drift coordinate
 151   TString hname;
 152   hname.Form("p%s",GetName());
 153   TH1F* hprof=new TH1F(hname.Data(),"",fNDriftPts,0.,35.);
 154   for(Int_t iDr=0;iDr<fNDriftPts; iDr++){
 155     Float_t meanval=0.;
 156     for(Int_t iAn=0;iAn<fNAnodePts; iAn++){
 157       meanval+=GetCellContent(iAn,iDr);
 158     }
 159     hprof->SetBinContent(iDr+1,meanval/fNAnodePts);
 160   }
 161   return hprof;
 162
 163 }
 164 //______________________________________________________________________
 165 TH1F* AliITSCorrMapSDD::GetResidualDistr(Float_t dmin, Float_t dmax) const{
 166   // Returns a TH1F histogram with distribution of residual
 167   TString hname;
 168   hname.Form("hd%s",GetName());
 169   TH1F* hd=new TH1F(hname.Data(),"",100,dmin,dmax);
 170   for(Int_t iAn=0;iAn<fNAnodePts; iAn++){
 171     for(Int_t iDr=0;iDr<fNDriftPts; iDr++){
 172       hd->Fill(GetCellContent(iAn,iDr));
 173     }
 174   }
 175   return hd;
 176 }
 177