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[u/mrichter/AliRoot.git] / FMD / AliFMDReconstructor.cxx

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/* $Id$ */
/** @file    AliFMDReconstructor.cxx
    @author  Christian Holm Christensen <cholm@nbi.dk>
    @date    Mon Mar 27 12:47:09 2006
    @brief   FMD reconstruction 
*/
//____________________________________________________________________
//
// This is a class that constructs AliFMDRecPoint objects from of Digits
// This class reads either digits from a TClonesArray or raw data from 
// a DDL file (or similar), and stores the read ADC counts in an
// internal cache (fAdcs).   The rec-points are made via the naiive
// method. 
//
//-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia
//  Latest changes by Christian Holm Christensen <cholm@nbi.dk>
//
//
//____________________________________________________________________

// #include <AliLog.h>                        // ALILOG_H
// #include <AliRun.h>                        // ALIRUN_H
#include "AliFMDDebug.h"
#include "AliFMDGeometry.h"                // ALIFMDGEOMETRY_H
#include "AliFMDParameters.h"              // ALIFMDPARAMETERS_H
#include "AliFMDDigit.h"                   // ALIFMDDIGIT_H
#include "AliFMDReconstructor.h"           // ALIFMDRECONSTRUCTOR_H
#include "AliFMDRawReader.h"               // ALIFMDRAWREADER_H
#include "AliFMDRecPoint.h"	   	   // ALIFMDMULTNAIIVE_H
#include "AliESDEvent.h"		   // ALIESDEVENT_H
#include "AliESDVertex.h"		   // ALIESDVERTEX_H
#include <AliESDFMD.h>			   // ALIESDFMD_H
#include <TMath.h>
#include <TH1.h>
#include <TH2.h>
#include <TFile.h>
class AliRawReader;

//____________________________________________________________________
ClassImp(AliFMDReconstructor)
#if 0
  ; // This is here to keep Emacs for indenting the next line
#endif

//____________________________________________________________________
AliFMDReconstructor::AliFMDReconstructor() 
  : AliReconstructor(),
    fMult(0x0), 
    fNMult(0),
    fTreeR(0x0),
    fCurrentVertex(0),
    fESDObj(0x0),
    fNoiseFactor(0),
    fAngleCorrect(kTRUE),
    fVertexType(kNoVertex),
    fESD(0x0),
    fDiagnostics(kFALSE),
    fDiagStep1(0), 
    fDiagStep2(0),
    fDiagStep3(0),
    fDiagStep4(0),
    fDiagAll(0)
{
  // Make a new FMD reconstructor object - default CTOR.  
  SetNoiseFactor();
  SetAngleCorrect();
  if (AliDebugLevel() > 0) fDiagnostics = kTRUE;
}
  

//____________________________________________________________________
AliFMDReconstructor::AliFMDReconstructor(const AliFMDReconstructor& other) 
  : AliReconstructor(), 
    fMult(other.fMult),
    fNMult(other.fNMult),
    fTreeR(other.fTreeR),
    fCurrentVertex(other.fCurrentVertex),
    fESDObj(other.fESDObj),
    fNoiseFactor(other.fNoiseFactor),
    fAngleCorrect(other.fAngleCorrect),
    fVertexType(other.fVertexType),
    fESD(other.fESD),
    fDiagnostics(other.fDiagnostics),
    fDiagStep1(other.fDiagStep1), 
    fDiagStep2(other.fDiagStep2),
    fDiagStep3(other.fDiagStep3),
    fDiagStep4(other.fDiagStep4),
    fDiagAll(other.fDiagAll) 
{
  // Copy constructor 
}
  

//____________________________________________________________________
AliFMDReconstructor&
AliFMDReconstructor::operator=(const AliFMDReconstructor& other) 
{
  // Assignment operator
  fMult          = other.fMult;
  fNMult         = other.fNMult;
  fTreeR         = other.fTreeR;
  fCurrentVertex = other.fCurrentVertex;
  fESDObj        = other.fESDObj;
  fNoiseFactor   = other.fNoiseFactor;
  fAngleCorrect  = other.fAngleCorrect;
  fVertexType    = other.fVertexType;
  fESD           = other.fESD;
  fDiagnostics   = other.fDiagnostics;
  fDiagStep1     = other.fDiagStep1;
  fDiagStep2     = other.fDiagStep2;
  fDiagStep3     = other.fDiagStep3;
  fDiagStep4     = other.fDiagStep4;
  fDiagAll       = other.fDiagAll;
  return *this;
}

//____________________________________________________________________
AliFMDReconstructor::~AliFMDReconstructor() 
{
  // Destructor 
  if (fMult)   fMult->Delete();
  if (fMult)   delete fMult;
  if (fESDObj) delete fESDObj;
}

//____________________________________________________________________
void 
AliFMDReconstructor::Init() 
{
  // Initialize the reconstructor 

  // Initialize the geometry 
  AliFMDGeometry* geom = AliFMDGeometry::Instance();
  geom->Init();
  geom->InitTransformations();

  // Initialize the parameters
  AliFMDParameters* param = AliFMDParameters::Instance();
  param->Init();
  
  // Current vertex position
  fCurrentVertex = 0;
  // Create array of reconstructed strip multiplicities 
  fMult = new TClonesArray("AliFMDRecPoint", 51200);
  // Create ESD output object 
  fESDObj = new AliESDFMD;
  
  // Check if we need diagnostics histograms 
  if (!fDiagnostics) return;
  AliInfo("Making diagnostics histograms");
  fDiagStep1   = new TH2I("diagStep1", "Read ADC vs. Noise surpressed ADC",
			1024, -.5, 1023.5, 1024, -.5, 1023.5);
  fDiagStep1->SetDirectory(0);
  fDiagStep1->GetXaxis()->SetTitle("ADC (read)");
  fDiagStep1->GetYaxis()->SetTitle(Form("ADC (noise surpressed %4.f)", 
					fNoiseFactor));
  fDiagStep2  = new TH2F("diagStep2",  "ADC vs Edep deduced",
			1024, -.5, 1023.5, 100, 0, 2);
  fDiagStep2->SetDirectory(0);
  fDiagStep2->GetXaxis()->SetTitle("ADC (noise surpressed)");
  fDiagStep2->GetYaxis()->SetTitle("#Delta E [GeV]");
  fDiagStep3  = new TH2F("diagStep3",  "Edep vs Edep path corrected",
			100, 0., 2., 100, 0., 2.);
  fDiagStep3->SetDirectory(0);
  fDiagStep3->GetXaxis()->SetTitle("#Delta E [GeV]");
  fDiagStep3->GetYaxis()->SetTitle("#Delta E/#Delta x #times #delta x [GeV]");
  fDiagStep4  = new TH2F("diagStep4",  "Edep vs Multiplicity deduced", 
			100, 0., 2., 100, -.1, 19.9);
  fDiagStep4->SetDirectory(0);
  fDiagStep4->GetXaxis()->SetTitle("#Delta E/#Delta x #times #delta x [GeV]");
  fDiagStep4->GetYaxis()->SetTitle("Multiplicity");
  fDiagAll    = new TH2F("diagAll",    "Read ADC vs Multiplicity deduced", 
			 1024, -.5, 1023.5, 100, -.1, 19.9);
  fDiagAll->SetDirectory(0);
  fDiagAll->GetXaxis()->SetTitle("ADC (read)");
  fDiagAll->GetYaxis()->SetTitle("Multiplicity");
}

//____________________________________________________________________
void 
AliFMDReconstructor::ConvertDigits(AliRawReader* reader, 
				   TTree* digitsTree) const
{
  // Convert Raw digits to AliFMDDigit's in a tree 
  AliFMDDebug(2, ("Reading raw data into digits tree"));
  AliFMDRawReader rawRead(reader, digitsTree);
  // rawRead.SetSampleRate(fFMD->GetSampleRate());
  rawRead.Exec();
}

//____________________________________________________________________
void 
AliFMDReconstructor::GetVertex() const
{
  // Return the vertex to use. 
  // This is obtained from the ESD object. 
  // If not found, a warning is issued.
  fVertexType    = kNoVertex;
  fCurrentVertex = 0;
  if (fESD) {
    const AliESDVertex* vertex = fESD->GetVertex();
    if (vertex) {
      AliFMDDebug(2, ("Got vertex from ESD: %f", vertex->GetZv()));
      fCurrentVertex = vertex->GetZv();
      fVertexType    = kESDVertex;
      return;
    }
  }
  AliWarning("Didn't get any vertex from ESD or generator");
}
  

//____________________________________________________________________
void 
AliFMDReconstructor::Reconstruct(AliRawReader* /*reader*/, TTree*) const
{
  // Reconstruct directly from raw data (no intermediate output on
  // digit tree or rec point tree).  
  // Parameters: 
  //   reader	Raw event reader 
  //   ctree    Not used. 
  AliError("Method is not used");
#if 0
  TClonesArray*   array = new TClonesArray("AliFMDDigit");
  AliFMDRawReader rawRead(reader, 0);
  rawRead.ReadAdcs(array);
  ProcessDigits(array);
  array->Delete();
  delete array;
#endif
}

//____________________________________________________________________
void 
AliFMDReconstructor::Reconstruct(TTree* digitsTree, 
				 TTree* clusterTree) const 
{
  // Reconstruct event from digits in tree 
  // Get the FMD branch holding the digits. 
  // FIXME: The vertex may not be known yet, so we may have to move
  // some of this to FillESD. 
  AliFMDDebug(2, ("Reconstructing from digits in a tree"));
  GetVertex();

  TBranch *digitBranch = digitsTree->GetBranch("FMD");
  if (!digitBranch) {
    Error("Exec", "No digit branch for the FMD found");
    return;
  }
  TClonesArray* digits = new TClonesArray("AliFMDDigit");
  digitBranch->SetAddress(&digits);

  if (fMult)   fMult->Clear();
  if (fESDObj) fESDObj->Clear();
  
  fNMult = 0;
  fTreeR = clusterTree;
  fTreeR->Branch("FMD", &fMult);
  
  AliFMDDebug(5, ("Getting entry 0 from digit branch"));
  digitBranch->GetEntry(0);
  
  AliFMDDebug(5, ("Processing digits"));
  ProcessDigits(digits);

  Int_t written = clusterTree->Fill();
  AliFMDDebug(10, ("Filled %d bytes into cluster tree", written));
  digits->Delete();
  delete digits;
}
 

//____________________________________________________________________
void
AliFMDReconstructor::ProcessDigits(TClonesArray* digits) const
{
  // For each digit, find the pseudo rapdity, azimuthal angle, and
  // number of corrected ADC counts, and pass it on to the algorithms
  // used. 
  Int_t nDigits = digits->GetEntries();
  AliFMDDebug(1, ("Got %d digits", nDigits));
  fESDObj->SetNoiseFactor(fNoiseFactor);
  fESDObj->SetAngleCorrected(fAngleCorrect);
  for (Int_t i = 0; i < nDigits; i++) {
    AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
    AliFMDParameters* param  = AliFMDParameters::Instance();
    // Check that the strip is not marked as dead 
    if (param->IsDead(digit->Detector(), digit->Ring(), 
		      digit->Sector(), digit->Strip())) {
      AliFMDDebug(10, ("FMD%d%c[%2d,%3d] is dead", digit->Detector(), 
			digit->Ring(), digit->Sector(), digit->Strip()));
      continue;
    }

    // digit->Print();
    // Get eta and phi 
    Float_t eta, phi;
    PhysicalCoordinates(digit, eta, phi);
    
    // Substract pedestal. 
    UShort_t counts   = SubtractPedestal(digit);
    
    // Gain match digits. 
    Double_t edep     = Adc2Energy(digit, eta, counts);
    
    // Make rough multiplicity 
    Double_t mult     = Energy2Multiplicity(digit, edep);
    
    AliFMDDebug(10, ("FMD%d%c[%2d,%3d]: "
		      "ADC: %d, Counts: %d, Energy: %f, Mult: %f", 
		      digit->Detector(), digit->Ring(), digit->Sector(),
		      digit->Strip(), digit->Counts(), counts, edep, mult));
    
    // Create a `RecPoint' on the output branch. 
    if (fMult) {
      AliFMDRecPoint* m = 
	new ((*fMult)[fNMult]) AliFMDRecPoint(digit->Detector(), 
					      digit->Ring(), 
					      digit->Sector(),
					      digit->Strip(),
					      eta, phi, 
					      edep, mult);
      (void)m; // Suppress warnings about unused variables. 
      fNMult++;
    }
    
    fESDObj->SetMultiplicity(digit->Detector(), digit->Ring(), 
			     digit->Sector(),  digit->Strip(), mult);
    fESDObj->SetEta(digit->Detector(), digit->Ring(), 
		    digit->Sector(),  digit->Strip(), eta);

    if (fDiagAll) fDiagAll->Fill(digit->Counts(), mult);  
  }
}

//____________________________________________________________________
UShort_t
AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const
{
  // Member function to subtract the pedestal from a digit
  // This implementation does nothing, but a derived class could over
  // load this to subtract a pedestal that was given in a database or
  // something like that. 

  AliFMDParameters* param  = AliFMDParameters::Instance();
  Float_t           ped    = param->GetPedestal(digit->Detector(), 
						digit->Ring(), 
						digit->Sector(), 
						digit->Strip());
  Float_t           noise  = param->GetPedestalWidth(digit->Detector(), 
						     digit->Ring(), 
						     digit->Sector(), 
						     digit->Strip());
  AliFMDDebug(15, ("Subtracting pedestal %f from signal %d", 
		   ped, digit->Counts()));
  // if (digit->Count3() > 0)      adc = digit->Count3();
  // else if (digit->Count2() > 0) adc = digit->Count2();
  // else                          adc = digit->Count1();
  Int_t adc    = digit->Counts();
  Int_t counts = TMath::Max(Int_t(adc - ped), 0);
  if (counts < noise * fNoiseFactor) counts = 0;
  if (counts > 0) AliFMDDebug(15, ("Got a hit strip"));
  if (fDiagStep1) fDiagStep1->Fill(adc, counts);
  
  return  UShort_t(counts);
}

//____________________________________________________________________
Float_t
AliFMDReconstructor::Adc2Energy(AliFMDDigit* digit, 
				Float_t      eta, 
				UShort_t     count) const
{
  // Converts number of ADC counts to energy deposited. 
  // Note, that this member function can be overloaded by derived
  // classes to do strip-specific look-ups in databases or the like,
  // to find the proper gain for a strip. 
  // 
  // In this simple version, we calculate the energy deposited as 
  // 
  //    EnergyDeposited = cos(theta) * gain * count
  // 
  // where 
  // 
  //           Pre_amp_MIP_Range
  //    gain = ----------------- * Energy_deposited_per_MIP
  //           ADC_channel_size    
  // 
  // is constant and the same for all strips.
  if (count <= 0) return 0;
  AliFMDParameters* param = AliFMDParameters::Instance();
  Float_t           gain  = param->GetPulseGain(digit->Detector(), 
						digit->Ring(), 
						digit->Sector(), 
						digit->Strip());
  AliFMDDebug(15, ("Converting counts %d to energy via factor %f", 
		    count, gain));

  Double_t edep  = count * gain;
  if (fDiagStep2) fDiagStep2->Fill(count, edep);  
  if (fAngleCorrect) {
    Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta));
    Double_t corr  = TMath::Abs(TMath::Cos(theta));
    Double_t cedep = corr * edep;
    AliFMDDebug(10, ("correcting for path %f * %f = %f (eta=%f, theta=%f)",
		      edep, corr, cedep, eta, theta));
    if (fDiagStep3) fDiagStep3->Fill(edep, cedep);  
    edep = cedep;
  }
  return edep;
}

//____________________________________________________________________
Float_t
AliFMDReconstructor::Energy2Multiplicity(AliFMDDigit* /* digit */, 
					 Float_t      edep) const
{
  // Converts an energy signal to number of particles. 
  // Note, that this member function can be overloaded by derived
  // classes to do strip-specific look-ups in databases or the like,
  // to find the proper gain for a strip. 
  // 
  // In this simple version, we calculate the multiplicity as 
  // 
  //   multiplicity = Energy_deposited / Energy_deposited_per_MIP
  // 
  // where 
  //
  //   Energy_deposited_per_MIP = 1.664 * SI_density * SI_thickness 
  // 
  // is constant and the same for all strips 
  AliFMDParameters* param   = AliFMDParameters::Instance();
  Double_t          edepMIP = param->GetEdepMip();
  Float_t           mult    = edep / edepMIP;
  if (edep > 0) 
    AliFMDDebug(15, ("Translating energy %f to multiplicity via "
		     "divider %f->%f", edep, edepMIP, mult));
  if (fDiagStep4) fDiagStep4->Fill(edep, mult);  
  return mult;
}

//____________________________________________________________________
void
AliFMDReconstructor::PhysicalCoordinates(AliFMDDigit* digit, 
					 Float_t& eta, 
					 Float_t& phi) const
{
  // Get the eta and phi of a digit 
  // 
  // Get geometry. 
  AliFMDGeometry* geom = AliFMDGeometry::Instance();
  Double_t x, y, z, r, theta;
  geom->Detector2XYZ(digit->Detector(), digit->Ring(), digit->Sector(), 
		    digit->Strip(), x, y, z);
  // Correct for vertex offset. 
  z     += fCurrentVertex;
  phi   =  TMath::ATan2(y, x);
  r     =  TMath::Sqrt(y * y + x * x);
  theta =  TMath::ATan2(r, z);
  eta   = -TMath::Log(TMath::Tan(theta / 2));
}

      

//____________________________________________________________________
void 
AliFMDReconstructor::FillESD(TTree*  /* digitsTree */, 
			     TTree*  /* clusterTree */,
			     AliESDEvent* esd) const
{
  // nothing to be done
  // FIXME: The vertex may not be known when Reconstruct is executed,
  // so we may have to move some of that member function here. 
  AliFMDDebug(2, ("Calling FillESD with two trees and one ESD"));
  // fESDObj->Print();

  if (esd) { 
    AliFMDDebug(2, ("Writing FMD data to ESD tree"));
    esd->SetFMDData(fESDObj);
  }

  if (!fDiagnostics || !esd) return;
  static bool first = true;
  // This is most likely NOT the event number you'd like to use. It
  // has nothing to do with the 'real' event number. 
  // - That's OK.  We just use it for the name of the directory -
  // nothing else.  Christian
  Int_t evno = esd->GetEventNumberInFile(); 
  AliFMDDebug(1, ("Writing diagnostics histograms to FMD.Diag.root/%03d",evno));
  TFile f("FMD.Diag.root", (first ? "RECREATE" : "UPDATE"));
  first = false;
  f.cd(); 
  TDirectory* d = f.mkdir(Form("%03d", evno), 
			  Form("Diagnostics histograms for event # %d", evno));
  d->cd();
  if (fDiagStep1) fDiagStep1->Write();
  if (fDiagStep2) fDiagStep2->Write();
  if (fDiagStep3) fDiagStep3->Write();
  if (fDiagStep4) fDiagStep4->Write();
  if (fDiagAll)   fDiagAll->Write();
  d->Write();
  f.Write();
  f.Close();

  if (fDiagStep1) fDiagStep1->Reset();
  if (fDiagStep2) fDiagStep2->Reset();
  if (fDiagStep3) fDiagStep3->Reset();
  if (fDiagStep4) fDiagStep4->Reset();
  if (fDiagAll)   fDiagAll->Reset();
}

//____________________________________________________________________
void
AliFMDReconstructor::FillESD(AliRawReader*, TTree* clusterTree, 
			     AliESDEvent* esd) const
{
  TTree* dummy = 0;
  FillESD(dummy, clusterTree, esd);
}

//____________________________________________________________________
//
// EOF
//