FMD/AliFMDBackgroundCorrection.cxx

   1 /**************************************************************************
   2  * Copyright(c) 2004, 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 // Thil class computes background corrections for the FMD. The correction is computed
  17 // in eta,phi cells and the objects stored can be put into alien to use with analysis.
  18 // It is based on the AliFMDInput class that is used to loop over hits and primaries.
  19 //
  20 // Author: Hans Hjersing Dalsgaard, NBI, hans.dalsgaard@cern.ch
  21 //
  22 //
  23
  24 #include "AliSimulation.h"
  25 #include "TStopwatch.h"
  26 #include "iostream"
  27 #include "TGrid.h"
  28 #include "AliRunLoader.h"
  29 #include "AliGeomManager.h"
  30 #include "AliFMDGeometry.h"
  31 #include "AliStack.h"
  32 #include "TParticle.h"
  33 #include "TDatabasePDG.h"
  34 #include "TParticlePDG.h"
  35 #include "AliRun.h"
  36 #include "AliFMDBackgroundCorrection.h"
  37 #include "TSystem.h"
  38 #include "AliCDBManager.h"
  39 #include "TTree.h"
  40 #include "TClonesArray.h"
  41 #include "TBranch.h"
  42 #include "AliFMDHit.h"
  43 #include "AliLoader.h"
  44 #include "AliFMD.h"
  45 #include "TH2F.h"
  46 #include "AliGenEventHeader.h"
  47 #include "AliHeader.h"
  48 #include "TFile.h"
  49 #include "TAxis.h"
  50 #include "AliCDBId.h"
  51 #include "AliCDBMetaData.h"
  52 #include "TROOT.h"
  53 #include "AliFMDParameters.h"
  54 #include "AliLog.h"
  55 #include "AliFMDAnaParameters.h"
  56 #include "AliFMDAnaCalibBackgroundCorrection.h"
  57
  58 ClassImp(AliFMDBackgroundCorrection)
  59 //_____________________________________________________________________
  60 AliFMDBackgroundCorrection::AliFMDBackgroundCorrection() :
  61   TNamed(),
  62   fCorrectionArray()
  63 {}
  64
  65 //_____________________________________________________________________
  66 AliFMDBackgroundCorrection::AliFMDInputBG::AliFMDInputBG() :
  67   AliFMDInput(),
  68   fPrimaryArray(),
  69   fHitArray(),
  70   fPrim(0),
  71   fHits(0),
  72   fZvtxCut(0),
  73   fNvtxBins(0),
  74   fPrevTrack(-1),
  75   fPrevDetector(-1),
  76   fPrevRing('Q'),
  77   fNbinsEta(100)
  78 {
  79   AddLoad(kTracks);
  80   AddLoad(kHits);
  81   AddLoad(kKinematics);
  82   AddLoad(kHeader);
  83 }
  84
  85 //_____________________________________________________________________
  86
  87 void AliFMDBackgroundCorrection::GenerateBackgroundCorrection(Int_t nvtxbins,
  88                                                               Float_t zvtxcut,
  89                                                               Int_t nBinsEta,
  90                                                               Bool_t storeInAlien,
  91                                                               Int_t runNo,
  92                                                               Int_t endRunNo,
  93                                                               const Char_t* filename,
  94                                                               Bool_t simulate,
  95                                                               Int_t nEvents) {
  96
  97   TGrid::Connect("alien:",0,0,"t");
  98   if(simulate)
  99     Simulate(nEvents);
 100   else {
 101     AliCDBManager::Instance()->SetDefaultStorage("alien://Folder=/alice/data/2008/LHC08d/OCDB/");
 102     AliCDBManager::Instance()->SetRun(runNo);
 103
 104 #if defined(__CINT__)
 105     gSystem->Load("liblhapdf");
 106     gSystem->Load("libEGPythia6");
 107     gSystem->Load("libpythia6");
 108     gSystem->Load("libAliPythia6");
 109     gSystem->Load("libgeant321");
 110 #endif
 111   }
 112
 113   //Setting up the geometry
 114   //-----------------------------------------------
 115   if (AliGeomManager::GetGeometry() == NULL)
 116     AliGeomManager::LoadGeometry();
 117
 118   AliFMDGeometry* geo = AliFMDGeometry::Instance();
 119   geo->Init();
 120   geo->InitTransformations();
 121
 122
 123
 124   AliInfo("Processing hits and primaries ");
 125
 126   AliFMDInputBG input;
 127   input.SetVtxCutZ(zvtxcut);
 128   input.SetNvtxBins(nvtxbins);
 129   input.SetNbinsEta(nBinsEta);
 130   input.Run();
 131
 132   AliInfo(Form("Found %d primaries and %d hits.", input.GetNprim(),input.GetNhits()));
 133
 134   TObjArray* hitArray = input.GetHits();
 135   TObjArray* primaryArray = input.GetPrimaries();
 136   fCorrectionArray.SetName("FMD_bg_correction");
 137   fCorrectionArray.SetOwner();
 138
 139   AliFMDAnaCalibBackgroundCorrection* background = new AliFMDAnaCalibBackgroundCorrection();
 140
 141   for(Int_t det= 1; det <=3; det++) {
 142     Int_t nRings = (det==1 ? 1 : 2);
 143
 144     TObjArray* detArrayCorrection = new TObjArray();
 145     detArrayCorrection->SetName(Form("FMD%d",det));
 146     fCorrectionArray.AddAtAndExpand(detArrayCorrection,det);
 147
 148
 149     for(Int_t iring = 0; iring<nRings; iring++) {
 150       TObjArray* primRingArray = (TObjArray*)primaryArray->At(iring);
 151       Char_t ringChar = (iring == 0 ? 'I' : 'O');
 152       TObjArray* vtxArrayCorrection = new TObjArray();
 153       vtxArrayCorrection->SetName(Form("FMD%d%c",det,ringChar));
 154       detArrayCorrection->AddAtAndExpand(vtxArrayCorrection,iring);
 155
 156       for(Int_t vertexBin=0;vertexBin<nvtxbins;vertexBin++) {
 157         TObjArray* detArray  = (TObjArray*)hitArray->At(det);
 158         TObjArray* vtxArray  = (TObjArray*)detArray->At(iring);
 159         TH2F* hHits          = (TH2F*)vtxArray->At(vertexBin);
 160         TH2F* hPrimary  = (TH2F*)primRingArray->At(vertexBin);
 161         TH2F* hCorrection = (TH2F*)hHits->Clone(Form("FMD%d%c_vtxbin_%d_correction",det,ringChar,vertexBin));
 162         hCorrection->SetTitle(hCorrection->GetName());
 163         hCorrection->Divide(hPrimary);
 164         vtxArrayCorrection->AddAtAndExpand(hCorrection,vertexBin);
 165         background->SetBgCorrection(det,ringChar,vertexBin,hCorrection);
 166       }
 167
 168     }
 169   }
 170
 171   TAxis refAxis(nvtxbins,-1*zvtxcut,zvtxcut);
 172
 173   background->SetRefAxis(&refAxis);
 174
 175   TFile*  fout = new TFile(filename,"RECREATE");
 176   refAxis.Write("vertexbins");
 177   fout->mkdir("Hits");
 178   fout->cd("Hits");
 179   hitArray->Write();
 180   fout->mkdir("Primaries");
 181   fout->cd("Primaries");
 182   primaryArray->Write();
 183   fout->mkdir("Correction");
 184   fout->cd("Correction");
 185   fCorrectionArray.Write();
 186
 187   TObjArray* container = new TObjArray();
 188   container->SetOwner();
 189   container->AddAtAndExpand(&refAxis,0);
 190   container->AddAtAndExpand(&fCorrectionArray,1);
 191   container->AddAtAndExpand(hitArray,2);
 192   container->AddAtAndExpand(primaryArray,3);
 193
 194
 195   if(storeInAlien) {
 196     AliCDBManager* cdb = AliCDBManager::Instance();
 197     cdb->SetDefaultStorage("local://$ALICE_ROOT");
 198     AliCDBId      id(AliFMDAnaParameters::GetBackgroundPath(),runNo,endRunNo);
 199
 200     AliCDBMetaData* meta = new AliCDBMetaData;
 201     meta->SetResponsible(gSystem->GetUserInfo()->fRealName.Data());
 202     meta->SetAliRootVersion(gROOT->GetVersion());
 203     meta->SetBeamPeriod(1);
 204     meta->SetComment("Background Correction for FMD");
 205     meta->SetProperty("key1", background );
 206     cdb->Put(background, id, meta);
 207
 208   }
 209
 210   fout->Close();
 211
 212
 213 }
 214 //_____________________________________________________________________
 215 void AliFMDBackgroundCorrection::Simulate(Int_t nEvents) {
 216
 217   AliSimulation sim ;
 218   sim.SetRunNumber(0);
 219   TGrid::Connect("alien:",0,0,"t");
 220   sim.SetDefaultStorage("alien://Folder=/alice/data/2008/LHC08d/OCDB/");
 221   sim.SetConfigFile("Config.C");
 222   sim.SetRunQA("FMD:");
 223   TStopwatch timer;
 224   timer.Start();
 225   sim.RunSimulation(nEvents);
 226   timer.Stop();
 227   timer.Print();
 228
 229 }
 230
 231 //_____________________________________________________________________
 232 Bool_t AliFMDBackgroundCorrection::AliFMDInputBG::ProcessTrack(Int_t i , TParticle* p, AliFMDHit* h) {
 233
 234   AliGenEventHeader* genHeader = fLoader->GetHeader()->GenEventHeader();
 235   TArrayF vertex;
 236   genHeader->PrimaryVertex(vertex);
 237
 238   if(TMath::Abs(vertex.At(2)) > fZvtxCut)
 239     return kTRUE;
 240
 241   Double_t delta = 2*fZvtxCut/fNvtxBins;
 242   Double_t vertexBinDouble = (vertex.At(2) + fZvtxCut) / delta;
 243   Int_t vertexBin = (Int_t)vertexBinDouble;
 244
 245   if(h)
 246     if(h->Q() !=  0 && (i != fPrevTrack || h->Detector() != fPrevDetector || h->Ring() != fPrevRing)) {
 247
 248       Int_t det = h->Detector();
 249       Char_t ring = h->Ring();
 250       //  if(h->Detector() == 3)
 251       //        std::cout<<"Detected a hit in " <<"FMD"<<det<<ring<<"    ! "<<std::endl;
 252
 253       Int_t iring = (ring == 'I' ? 0 : 1);
 254
 255       TObjArray* detArray  = (TObjArray*)fHitArray.At(det);
 256       TObjArray* vtxArray  = (TObjArray*)detArray->At(iring);
 257       TH2F* hHits          = (TH2F*)vtxArray->At(vertexBin);
 258
 259       Float_t phi   = TMath::ATan2(h->Py(),h->Px());
 260       if(phi<0)
 261         phi = phi+2*TMath::Pi();
 262       Float_t theta = TMath::ATan2(TMath::Sqrt(TMath::Power(h->X(),2)+TMath::Power(h->Y(),2)),h->Z()+vertex.At(2));
 263       Float_t eta   = -1*TMath::Log(TMath::Tan(0.5*theta));
 264       hHits->Fill(eta,phi);
 265       fHits++;
 266       //fPrevTrack = i;
 267       fPrevDetector = det;
 268       fPrevRing     = ring;
 269     }
 270   if(p && i != fPrevTrack) {
 271
 272     TDatabasePDG* pdgDB = TDatabasePDG::Instance();
 273     TParticlePDG* pdgPart = pdgDB->GetParticle(p->GetPdgCode());
 274     Float_t charge = (pdgPart ? pdgPart->Charge() : 0);
 275     Float_t phi = TMath::ATan2(p->Py(),p->Px());
 276
 277     if(phi<0)
 278       phi = phi+2*TMath::Pi();
 279
 280
 281     Bool_t primary = (charge!=0)&&(TMath::Abs(p->Vx() - vertex.At(0))<0.1)&&(TMath::Abs(p->Vy() - vertex.At(1))<0.1)&&(TMath::Abs(p->Vz() - vertex.At(2))<0.1);
 282     if(primary) {
 283       fPrim++;
 284       TObjArray* innerArray = (TObjArray*)fPrimaryArray.At(0);
 285       TObjArray* outerArray = (TObjArray*)fPrimaryArray.At(1);
 286
 287       TH2F* hPrimaryInner  = (TH2F*)innerArray->At(vertexBin);
 288       TH2F* hPrimaryOuter  = (TH2F*)outerArray->At(vertexBin);
 289       hPrimaryInner->Fill(p->Eta(),phi);
 290       hPrimaryOuter->Fill(p->Eta(),phi);
 291     }
 292   }
 293
 294
 295   fPrevTrack = i;
 296   return kTRUE;
 297 }
 298
 299 //_____________________________________________________________________
 300 Bool_t AliFMDBackgroundCorrection::AliFMDInputBG::Init() {
 301
 302   fPrimaryArray.SetOwner();
 303   fPrimaryArray.SetName("FMD_primary");
 304
 305   for(Int_t iring = 0; iring<2;iring++) {
 306     Char_t ringChar = (iring == 0 ? 'I' : 'O');
 307     TObjArray* ringArray = new TObjArray();
 308     ringArray->SetName(Form("FMD_%c",ringChar));
 309     fPrimaryArray.AddAtAndExpand(ringArray,iring);
 310     Int_t nSec = (iring == 1 ? 40 : 20);
 311     for(Int_t v=0; v<fNvtxBins;v++) {
 312
 313       TH2F* hPrimary       = new TH2F(Form("hPrimary_FMD_%c_vtx%d",ringChar,v),
 314                                       Form("hPrimary_FMD_%c_vtx%d",ringChar,v),
 315                                       fNbinsEta, -6,6, nSec, 0,2*TMath::Pi());
 316       hPrimary->Sumw2();
 317       ringArray->AddAtAndExpand(hPrimary,v);
 318     }
 319   }
 320
 321
 322   fHitArray.SetOwner();
 323   fHitArray.SetName("FMD_hits");
 324
 325   for(Int_t det =1; det<=3;det++)
 326     {
 327       TObjArray* detArrayHits = new TObjArray();
 328       detArrayHits->SetName(Form("FMD%d",det));
 329       fHitArray.AddAtAndExpand(detArrayHits,det);
 330       Int_t nRings = (det==1 ? 1 : 2);
 331       for(Int_t ring = 0;ring<nRings;ring++)
 332         {
 333           Int_t nSec = (ring == 1 ? 40 : 20);
 334           Char_t ringChar = (ring == 0 ? 'I' : 'O');
 335           TObjArray* vtxArrayHits = new TObjArray();
 336           vtxArrayHits->SetName(Form("FMD%d%c",det,ringChar));
 337           detArrayHits->AddAtAndExpand(vtxArrayHits,ring);
 338           for(Int_t v=0; v<fNvtxBins;v++)
 339             {
 340
 341               TH2F* hHits          = new TH2F(Form("hHits_FMD%d%c_vtx%d",det,ringChar,v),
 342                                               Form("hHits_FMD%d%c_vtx%d",det,ringChar,v),
 343                                               fNbinsEta, -6,6, nSec, 0, 2*TMath::Pi());
 344               hHits->Sumw2();
 345               vtxArrayHits->AddAtAndExpand(hHits,v);
 346
 347             }
 348         }
 349
 350     }
 351
 352
 353
 354   AliFMDInput::Init();
 355
 356
 357   return kTRUE;
 358 }
 359 // EOF
 360
 361
 362