[u/mrichter/AliRoot.git] / TRD / AliTRDmcmTracklet.cxx

/**************************************************************************
 * 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.                  *
 **************************************************************************/

///////////////////////////////////////////////////////
//                                                   //
//                                                   //
//  Tracklet object created in the local tracking    //
//                                                   //
//                                                   //
///////////////////////////////////////////////////////

#include <TGraph.h>
#include <TMath.h>
#include <TF1.h>

#include "AliTRDcalibDB.h"
#include "AliTRDCommonParam.h"
#include "AliTRDpadPlane.h"
#include "AliTRDgeometry.h"

#include "AliTRDmcmTracklet.h"

ClassImp(AliTRDmcmTracklet)

//_____________________________________________________________________________
AliTRDmcmTracklet::AliTRDmcmTracklet() 
{

  //
  // AliTRDmcmTracklet default constructor
  //

  fDetector = -1;
  fRow      = -1;

  for (Int_t time = 0; time < kNtimeBins; time++) {
    for (Int_t icl = 0; icl < kNclsPads; icl++) {
      fADC[time][icl] = 0;
    }
    for (Int_t it = 0; it < kNdict; it++) {
      fTrack[time][it] = -1;
    }
    fTime[time]   = 0;
    fCol[time]    = 0;
  }

  fNclusters  =  0;
  fN          =  0;
  fTrackLabel = -1;

  fGPos = 0;
  fGAmp = 0;

  fSlope  = 0.0;
  fOffset = 0.0;
  fTime0  = 0.0;
  fRowz   = 0.0;
  fPt     = 0.0;
  fdQdl   = 0.0;

}

//_____________________________________________________________________________
AliTRDmcmTracklet::AliTRDmcmTracklet(Int_t det, Int_t row, Int_t n) 
{

  //
  // AliTRDmcmTracklet default constructor
  //

  fDetector = det;
  fRow      = row;

  for (Int_t time = 0; time < kNtimeBins; time++) {
    for (Int_t icl = 0; icl < kNclsPads; icl++) {
      fADC[time][icl] = 0;
    }
    for (Int_t it = 0; it < kNdict; it++) {
      fTrack[time][it] = -1;
    }
    fTime[time]   = 0;
    fCol[time]    = 0;
  }

  fNclusters = 0;

  fN = n;

  fTrackLabel = -1;

  fGPos = new TGraph(0);
  fGAmp = new TGraph(0);

  fSlope  = 0.0;
  fOffset = 0.0;
  fTime0  = 0.0;
  fRowz   = 0.0;
  fPt     = 0.0;
  fdQdl   = 0.0;

}

//_____________________________________________________________________________
AliTRDmcmTracklet::~AliTRDmcmTracklet() 
{

  //
  // AliTRDmcmTracklet destructor
  //
  delete fGPos;
  delete fGAmp;
}

//_____________________________________________________________________________
AliTRDmcmTracklet &AliTRDmcmTracklet::operator=(const AliTRDmcmTracklet &t)
{
  //
  // assignment operator
  //

  if (this != &t) ((AliTRDmcmTracklet &) t).Copy(*this); 
  return *this;

}

//_____________________________________________________________________________
void AliTRDmcmTracklet::Copy(TObject &t) const
{
  //
  // copy function
  //

  ((AliTRDmcmTracklet &) t).fDetector    = fDetector;
  ((AliTRDmcmTracklet &) t).fRow         = fRow;
  ((AliTRDmcmTracklet &) t).fTrackLabel  = fTrackLabel;
  ((AliTRDmcmTracklet &) t).fNclusters   = fNclusters;
  ((AliTRDmcmTracklet &) t).fN           = fN;
  ((AliTRDmcmTracklet &) t).fGPos        = NULL;
  ((AliTRDmcmTracklet &) t).fGAmp        = NULL;
  ((AliTRDmcmTracklet &) t).fTime0       = fTime0;
  ((AliTRDmcmTracklet &) t).fRowz        = fRowz;
  ((AliTRDmcmTracklet &) t).fSlope       = fSlope;
  ((AliTRDmcmTracklet &) t).fOffset      = fOffset;
  ((AliTRDmcmTracklet &) t).fPt          = fPt;
  ((AliTRDmcmTracklet &) t).fdQdl        = fdQdl;

  for (Int_t time = 0; time < kNtimeBins; time++) {
    for (Int_t icl = 0; icl < kNclsPads; icl++) {
      ((AliTRDmcmTracklet &) t).fADC[time][icl] = 0;
    }
    for (Int_t it = 0; it < kNdict; it++) {
      ((AliTRDmcmTracklet &) t).fTrack[time][it] = -1;
    }
    ((AliTRDmcmTracklet &) t).fTime[time]   = 0;
    ((AliTRDmcmTracklet &) t).fCol[time]    = 0;
  }

}

//_____________________________________________________________________________
void AliTRDmcmTracklet::AddCluster(Int_t icol, Int_t itb, Float_t *adc, Int_t *track) 
{
  //
  //
  //
 
  if (fNclusters >= kNtimeBins) return;

  for (Int_t icl = 0; icl < kNclsPads; icl++) {
    //fADC[fNclusters][icl] = (Int_t)adc[icl]; 
    fADC[fNclusters][icl] = adc[icl]; 
  }

  fTrack[fNclusters][0] = track[0];
  fTrack[fNclusters][1] = track[1];
  fTrack[fNclusters][2] = track[2];
  fTime[fNclusters] = itb;
  fCol[fNclusters] = icol;

  fNclusters++;

}

//_____________________________________________________________________________
void AliTRDmcmTracklet::MakeTrackletGraph(AliTRDgeometry *geo, Float_t field) 
{

  //
  // Tracklet graph of positions (global coordinates, rotated [cm])
  //
  
  if (!geo) {
    Error("MakeTrackletGraph","No geometry.");
    return;
  }
  
  AliTRDCommonParam* commonParam = AliTRDCommonParam::Instance();
  if (!commonParam)
  {
    Error("MakeTrackletGraph","No common params.");
    return;
  }

  AliTRDcalibDB* calibration = AliTRDcalibDB::Instance();
  if (!calibration)
  {
    Error("MakeTrackletGraph","No instance of AliTRDcalibDB.");
    return;
  }

  Int_t iplan, icham;

  iplan = geo->GetPlane(fDetector);
  icham = geo->GetChamber(fDetector);

  AliTRDpadPlane *padPlane = commonParam->GetPadPlane(iplan,icham);

  Float_t samplFreq = calibration->GetSamplingFrequency();

  Int_t time, col;
  Float_t amp[3];
  Float_t xpos, ypos, xzero, colSize, timeBinSize;
  Float_t vDrift, omegaTau, lorentzAngle, thetaSlope;
  Float_t tiltingAngle;
  Int_t npg = 0;

  for (Int_t icl = 0; icl < fNclusters; icl++) {

    time   = GetClusterTime(icl);

    amp[0] = GetClusterADC(icl)[0];
    amp[1] = GetClusterADC(icl)[1];
    amp[2] = GetClusterADC(icl)[2];

    col    = GetClusterCol(icl);

    if (amp[0] < 0.0 || amp[1] < 0.0 || amp[2] < 0.0) continue;

    ypos = GetClusY(amp,iplan);

    colSize = padPlane->GetColSize(col);
    vDrift = calibration->GetVdrift(fDetector,col,fRow);
    timeBinSize = vDrift/samplFreq;
    
    // From v4-03-Release to HEAD28Mar06 the sign has changed from "-" to "+" 
    // due to a change in the digitizer
    omegaTau = +TMath::Sign(1.0,(Double_t)field)*GetOmegaTau(vDrift,TMath::Abs(field));
    lorentzAngle = TMath::ATan(omegaTau)*180.0/TMath::Pi();
    
    xpos = (time+0.5) * timeBinSize;
    xpos = geo->GetTime0(iplan) - xpos;

    ypos = padPlane->GetColPos(col) - (ypos + 0.5) * colSize;

    // ExB correction
    xzero = geo->GetTime0(iplan);
    ypos = ypos + (xpos-xzero) * omegaTau;

    // tilted pads correction
    thetaSlope = - padPlane->GetRowPos(fRow)/geo->GetTime0(iplan);
    tiltingAngle = padPlane->GetTiltingAngle()/180.0*TMath::Pi();
    ypos = ypos - (xpos-xzero) * thetaSlope * TMath::Sin(tiltingAngle);

    fGPos->SetPoint(npg,(Double_t)xpos,(Double_t)ypos);
    npg++;

  }

  fGPos->Set(npg);
  
  fTime0 = geo->GetTime0(iplan) - AliTRDgeometry::CdrHght() - 0.5*AliTRDgeometry::CamHght();
  fRowz = 0.5*(padPlane->GetRowPos(fRow) + padPlane->GetRowPos(fRow+1));

  Double_t xMin = 0, xMax = 0, x, y;
  fGPos->GetPoint(0    ,x,y); xMax = x + 0.1;
  fGPos->GetPoint(npg-1,x,y); xMin = x - 0.1;
  
  TF1 *line = new TF1("line","[0]+x*[1]",xMin,xMax);
  fGPos->Fit(line,"WRQ0");

  fOffset = line->Eval(fTime0);
  fSlope  = TMath::ATan(line->GetParameter(1))*180.0/TMath::Pi();

  line->Delete();
  
  Float_t fx = fTime0;
  Float_t fy = fOffset;
  
  Float_t infSlope = TMath::ATan(fy/fx)/TMath::Pi()*180.0;    
  Float_t alpha = fSlope - infSlope;
  Float_t r = TMath::Sqrt(fx*fx + fy*fy)/(2.0*TMath::Sin(alpha/180.0*TMath::Pi()));

  fPt = 0.3 * field * 0.01 * r;
  
  return;

}

//_____________________________________________________________________________
void AliTRDmcmTracklet::MakeClusAmpGraph() 
{
  //
  // Tracklet graph of cluster charges
  //

  AliTRDcalibDB* calibration = AliTRDcalibDB::Instance();
  if (!calibration)
  {
    Error("MakeClusAmpGraph","No instance of AliTRDcalibDB.");
    return;
  }

  Int_t time;
  Float_t amp[3];
  Int_t npg = 0;
  fdQdl = 0.0;
  for (Int_t icl = 0; icl < fNclusters; icl++) {

    time   = GetClusterTime(icl);

    amp[0] = GetClusterADC(icl)[0];
    amp[1] = GetClusterADC(icl)[1];
    amp[2] = GetClusterADC(icl)[2];

    fGAmp->SetPoint(npg,(Double_t)(time+0.5),(Double_t)(amp[0]+amp[1]+amp[2]));
    npg++;

    fdQdl += amp[0]+amp[1]+amp[2];

  }

  fGAmp->Set(npg);

  fdQdl /= (Float_t)npg;

  return;

}

//_____________________________________________________________________________
Float_t AliTRDmcmTracklet::GetClusY(Float_t *adc, Int_t pla) const
{
  //
  // Cluster position in the phi direction in pad units (relative to the pad border)
  //

  Float_t ypos = 0.0;

  Float_t a0 = adc[0];
  Float_t a1 = adc[1];
  Float_t a2 = adc[2];

  Float_t t1, t2, w1 ,w2;

  Float_t w = 1.0;  // pad units

  Float_t sigma = 0.0;

  switch(pla) {
  case 0:
    sigma = 0.515; break;
  case 1:
    sigma = 0.501; break;
  case 2:
    sigma = 0.491; break;
  case 3:
    sigma = 0.481; break;
  case 4:
    sigma = 0.471; break;
  case 5:
    sigma = 0.463; break;
  default:
    Error("GetClusY","Wrong plane number.");
    return 0.0;
  }

  sigma *= w;

  t1 = 0.0;
  w1 = 0.0;
  if( a0 > 0 ) {
    w1 = a0*a0;
    //w1 = a0;
    t1 = w1*((sigma*sigma)/w*TMath::Log(a1/a0)-0.5*w);
  }
  t2 = 0.0;
  w2 = 0.0;
  if( a2 > 0 ) {
    w2 = a2*a2;
    //w2 = a2;
    t2 = w2*((sigma*sigma)/w*TMath::Log(a2/a1)+0.5*w);
  }

  ypos = w*(t1+t2)/(w1+w2);  // range: -0.5*w ... +0.5*w

  return ypos;

}

//_____________________________________________________________________________
void AliTRDmcmTracklet::CookLabel(Float_t frac) 
{
  //
  // Cook the track label from cluster labels
  //

  const Int_t kMaxTracks = 10;
  Int_t trackLabel[kMaxTracks];
  Int_t trackCount[kMaxTracks];
  for (Int_t it = 0; it < kMaxTracks; it++) {
    trackLabel[it] = -1;
    trackCount[it] = 0;
  }

  Bool_t counted;
  Int_t label, nTracks = 0;
  for (Int_t icl = 0; icl < fNclusters; icl++) {

    for (Int_t id = 0; id < kNdict; id++) {

      if (fTrack[icl][id] == -1) continue;

      label = fTrack[icl][id];

      counted = kFALSE;
      for (Int_t it = 0; it < nTracks; it++) {
	if (label == trackLabel[it]) {
	  trackCount[it]++;
	  counted = kTRUE;
	  break;
	}
      }
      if (!counted) {
	trackLabel[nTracks] = label;
	trackCount[nTracks]++;
	nTracks++;
	if (nTracks == kMaxTracks) {
	  Warning("CookLabel","Too many tracks for this tracklet.");
	  nTracks--;
	  break;
	}
      }

    }

  }

  for (Int_t it = 0; it < kMaxTracks; it++) {
    if (trackCount[it] >= (Int_t)(frac*fNclusters)) {
      fTrackLabel = trackLabel[it];
      break;
    }
  }

}

//_____________________________________________________________________________
Float_t AliTRDmcmTracklet::GetOmegaTau(Float_t vdrift, Float_t field) const
{
  //
  // Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd> 
  // and a B-field <b> for Xe/CO2 (15%).
  // The values are according to a GARFIELD simulation.
  //

  //
  // Copy of the "AliTRDcalibDB" function, taking as argument the magnetic field too
  //
  
  const Int_t kNb = 5;
  Float_t p0[kNb] = {  0.004810,  0.007412,  0.010252,  0.013409,  0.016888 };
  Float_t p1[kNb] = {  0.054875,  0.081534,  0.107333,  0.131983,  0.155455 };
  Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 };
  Float_t p3[kNb] = {  0.000155,  0.000238,  0.000330,  0.000428,  0.000541 };

  Int_t ib = ((Int_t) (10 * (field - 0.15)));
  ib       = TMath::Max(  0,ib);
  ib       = TMath::Min(kNb,ib);

  Float_t alphaL = p0[ib] 
      + p1[ib] * vdrift
      + p2[ib] * vdrift*vdrift
      + p3[ib] * vdrift*vdrift*vdrift;

  return TMath::Tan(alphaL);

}
Commit	Line	Data
0ee00e25	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, 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
e3b2b5e5	16	///////////////////////////////////////////////////////
	17	// //
	18	// //
	19	// Tracklet object created in the local tracking //
	20	// //
	21	// //
	22	///////////////////////////////////////////////////////
	23
0ee00e25	24	#include <TGraph.h>
	25	#include <TMath.h>
	26	#include <TF1.h>
	27
	28	#include "AliTRDcalibDB.h"
	29	#include "AliTRDCommonParam.h"
	30	#include "AliTRDpadPlane.h"
	31	#include "AliTRDgeometry.h"
	32
	33	#include "AliTRDmcmTracklet.h"
	34
	35	ClassImp(AliTRDmcmTracklet)
	36
	37	//_____________________________________________________________________________
	38	AliTRDmcmTracklet::AliTRDmcmTracklet()
	39	{
	40
	41	//
	42	// AliTRDmcmTracklet default constructor
	43	//
	44
	45	fDetector = -1;
	46	fRow = -1;
	47
	48	for (Int_t time = 0; time < kNtimeBins; time++) {
	49	for (Int_t icl = 0; icl < kNclsPads; icl++) {
	50	fADC[time][icl] = 0;
	51	}
	52	for (Int_t it = 0; it < kNdict; it++) {
	53	fTrack[time][it] = -1;
	54	}
	55	fTime[time] = 0;
	56	fCol[time] = 0;
	57	}
	58
	59	fNclusters = 0;
	60	fN = 0;
	61	fTrackLabel = -1;
	62
	63	fGPos = 0;
	64	fGAmp = 0;
	65
	66	fSlope = 0.0;
	67	fOffset = 0.0;
	68	fTime0 = 0.0;
	69	fRowz = 0.0;
	70	fPt = 0.0;
	71	fdQdl = 0.0;
	72
	73	}
	74
	75	//_____________________________________________________________________________
	76	AliTRDmcmTracklet::AliTRDmcmTracklet(Int_t det, Int_t row, Int_t n)
	77	{
	78
	79	//
	80	// AliTRDmcmTracklet default constructor
	81	//
	82
	83	fDetector = det;
	84	fRow = row;
	85
	86	for (Int_t time = 0; time < kNtimeBins; time++) {
	87	for (Int_t icl = 0; icl < kNclsPads; icl++) {
88	fADC[time][icl] = 0;
89	}
90	for (Int_t it = 0; it < kNdict; it++) {
91	fTrack[time][it] = -1;
92	}
93	fTime[time] = 0;
94	fCol[time] = 0;
95	}
96
97	fNclusters = 0;
98
99	fN = n;
100
101	fTrackLabel = -1;
102
103	fGPos = new TGraph(0);
104	fGAmp = new TGraph(0);
105
106	fSlope = 0.0;
107	fOffset = 0.0;
108	fTime0 = 0.0;
109	fRowz = 0.0;
110	fPt = 0.0;
111	fdQdl = 0.0;
112
113	}
114
115	//_____________________________________________________________________________
116	AliTRDmcmTracklet::~AliTRDmcmTracklet()
117	{
118
119	//
120	// AliTRDmcmTracklet destructor
121	//
e3b2b5e5	122	delete fGPos;
	123	delete fGAmp;
	124	}
	125
	126	//_____________________________________________________________________________
	127	AliTRDmcmTracklet &AliTRDmcmTracklet::operator=(const AliTRDmcmTracklet &t)
	128	{
	129	//
	130	// assignment operator
	131	//
	132
	133	if (this != &t) ((AliTRDmcmTracklet &) t).Copy(*this);
	134	return *this;
	135
	136	}
	137
	138	//_____________________________________________________________________________
	139	void AliTRDmcmTracklet::Copy(TObject &t) const
	140	{
	141	//
	142	// copy function
	143	//
	144
	145	((AliTRDmcmTracklet &) t).fDetector = fDetector;
	146	((AliTRDmcmTracklet &) t).fRow = fRow;
	147	((AliTRDmcmTracklet &) t).fTrackLabel = fTrackLabel;
	148	((AliTRDmcmTracklet &) t).fNclusters = fNclusters;
	149	((AliTRDmcmTracklet &) t).fN = fN;
	150	((AliTRDmcmTracklet &) t).fGPos = NULL;
	151	((AliTRDmcmTracklet &) t).fGAmp = NULL;
	152	((AliTRDmcmTracklet &) t).fTime0 = fTime0;
	153	((AliTRDmcmTracklet &) t).fRowz = fRowz;
	154	((AliTRDmcmTracklet &) t).fSlope = fSlope;
	155	((AliTRDmcmTracklet &) t).fOffset = fOffset;
	156	((AliTRDmcmTracklet &) t).fPt = fPt;
	157	((AliTRDmcmTracklet &) t).fdQdl = fdQdl;
	158
	159	for (Int_t time = 0; time < kNtimeBins; time++) {
	160	for (Int_t icl = 0; icl < kNclsPads; icl++) {
	161	((AliTRDmcmTracklet &) t).fADC[time][icl] = 0;
	162	}
	163	for (Int_t it = 0; it < kNdict; it++) {
	164	((AliTRDmcmTracklet &) t).fTrack[time][it] = -1;
	165	}
	166	((AliTRDmcmTracklet &) t).fTime[time] = 0;
	167	((AliTRDmcmTracklet &) t).fCol[time] = 0;
	168	}
	169
	170	}
	171
	172	//_____________________________________________________________________________
	173	void AliTRDmcmTracklet::AddCluster(Int_t icol, Int_t itb, Float_t adc, Int_t track)
	174	{
	175	//
	176	//
	177	//
	178
	179	if (fNclusters >= kNtimeBins) return;
	180
	181	for (Int_t icl = 0; icl < kNclsPads; icl++) {
	182	//fADC[fNclusters][icl] = (Int_t)adc[icl];
	183	fADC[fNclusters][icl] = adc[icl];
	184	}
	185
186	fTrack[fNclusters][0] = track[0];
187	fTrack[fNclusters][1] = track[1];
188	fTrack[fNclusters][2] = track[2];
189	fTime[fNclusters] = itb;
190	fCol[fNclusters] = icol;
191
192	fNclusters++;
0ee00e25	193
	194	}
	195
	196	//_____________________________________________________________________________
	197	void AliTRDmcmTracklet::MakeTrackletGraph(AliTRDgeometry *geo, Float_t field)
	198	{
	199
	200	//
	201	// Tracklet graph of positions (global coordinates, rotated [cm])
	202	//
	203
	204	if (!geo) {
	205	Error("MakeTrackletGraph","No geometry.");
	206	return;
	207	}
	208
	209	AliTRDCommonParam* commonParam = AliTRDCommonParam::Instance();
	210	if (!commonParam)
	211	{
	212	Error("MakeTrackletGraph","No common params.");
	213	return;
	214	}
	215
	216	AliTRDcalibDB* calibration = AliTRDcalibDB::Instance();
	217	if (!calibration)
	218	{
	219	Error("MakeTrackletGraph","No instance of AliTRDcalibDB.");
	220	return;
	221	}
	222
	223	Int_t iplan, icham;
	224
	225	iplan = geo->GetPlane(fDetector);
	226	icham = geo->GetChamber(fDetector);
	227
	228	AliTRDpadPlane *padPlane = commonParam->GetPadPlane(iplan,icham);
	229
e3b2b5e5	230	Float_t samplFreq = calibration->GetSamplingFrequency();
0ee00e25	231
	232	Int_t time, col;
	233	Float_t amp[3];
e3b2b5e5	234	Float_t xpos, ypos, xzero, colSize, timeBinSize;
	235	Float_t vDrift, omegaTau, lorentzAngle, thetaSlope;
	236	Float_t tiltingAngle;
0ee00e25	237	Int_t npg = 0;
	238
	239	for (Int_t icl = 0; icl < fNclusters; icl++) {
	240
	241	time = GetClusterTime(icl);
	242
	243	amp[0] = GetClusterADC(icl)[0];
	244	amp[1] = GetClusterADC(icl)[1];
	245	amp[2] = GetClusterADC(icl)[2];
	246
	247	col = GetClusterCol(icl);
	248
	249	if (amp[0] < 0.0 \|\| amp[1] < 0.0 \|\| amp[2] < 0.0) continue;
	250
e3b2b5e5	251	ypos = GetClusY(amp,iplan);
0ee00e25	252
e3b2b5e5	253	colSize = padPlane->GetColSize(col);
0ee00e25	254	vDrift = calibration->GetVdrift(fDetector,col,fRow);
e3b2b5e5	255	timeBinSize = vDrift/samplFreq;
0ee00e25	256
	257	// From v4-03-Release to HEAD28Mar06 the sign has changed from "-" to "+"
	258	// due to a change in the digitizer
e3b2b5e5	259	omegaTau = +TMath::Sign(1.0,(Double_t)field)*GetOmegaTau(vDrift,TMath::Abs(field));
e3b2b5e5	260	lorentzAngle = TMath::ATan(omegaTau)*180.0/TMath::Pi();
0ee00e25	261
e3b2b5e5	262	xpos = (time+0.5) * timeBinSize;
e3b2b5e5	263	xpos = geo->GetTime0(iplan) - xpos;
0ee00e25	264
e3b2b5e5	265	ypos = padPlane->GetColPos(col) - (ypos + 0.5) * colSize;
0ee00e25	266
0ee00e25	267	// ExB correction
e3b2b5e5	268	xzero = geo->GetTime0(iplan);
e3b2b5e5	269	ypos = ypos + (xpos-xzero) * omegaTau;
0ee00e25	270
0ee00e25	271	// tilted pads correction
e3b2b5e5	272	thetaSlope = - padPlane->GetRowPos(fRow)/geo->GetTime0(iplan);
	273	tiltingAngle = padPlane->GetTiltingAngle()/180.0*TMath::Pi();
	274	ypos = ypos - (xpos-xzero) * thetaSlope * TMath::Sin(tiltingAngle);
0ee00e25	275
e3b2b5e5	276	fGPos->SetPoint(npg,(Double_t)xpos,(Double_t)ypos);
0ee00e25	277	npg++;
	278
	279	}
	280
	281	fGPos->Set(npg);
	282
	283	fTime0 = geo->GetTime0(iplan) - AliTRDgeometry::CdrHght() - 0.5*AliTRDgeometry::CamHght();
	284	fRowz = 0.5*(padPlane->GetRowPos(fRow) + padPlane->GetRowPos(fRow+1));
	285
	286	Double_t xMin = 0, xMax = 0, x, y;
	287	fGPos->GetPoint(0 ,x,y); xMax = x + 0.1;
	288	fGPos->GetPoint(npg-1,x,y); xMin = x - 0.1;
	289
	290	TF1 line = new TF1("line","[0]+x[1]",xMin,xMax);
	291	fGPos->Fit(line,"WRQ0");
	292
	293	fOffset = line->Eval(fTime0);
	294	fSlope = TMath::ATan(line->GetParameter(1))*180.0/TMath::Pi();
	295
	296	line->Delete();
	297
e3b2b5e5	298	Float_t fx = fTime0;
e3b2b5e5	299	Float_t fy = fOffset;
0ee00e25	300
e3b2b5e5	301	Float_t infSlope = TMath::ATan(fy/fx)/TMath::Pi()*180.0;
0ee00e25	302	Float_t alpha = fSlope - infSlope;
e3b2b5e5	303	Float_t r = TMath::Sqrt(fxfx + fyfy)/(2.0TMath::Sin(alpha/180.0TMath::Pi()));
0ee00e25	304
e3b2b5e5	305	fPt = 0.3 * field * 0.01 * r;
0ee00e25	306
	307	return;
	308
	309	}
	310
	311	//_____________________________________________________________________________
	312	void AliTRDmcmTracklet::MakeClusAmpGraph()
	313	{
	314	//
	315	// Tracklet graph of cluster charges
	316	//
	317
	318	AliTRDcalibDB* calibration = AliTRDcalibDB::Instance();
	319	if (!calibration)
	320	{
	321	Error("MakeClusAmpGraph","No instance of AliTRDcalibDB.");
	322	return;
	323	}
	324
	325	Int_t time;
	326	Float_t amp[3];
	327	Int_t npg = 0;
	328	fdQdl = 0.0;
	329	for (Int_t icl = 0; icl < fNclusters; icl++) {
	330
	331	time = GetClusterTime(icl);
	332
	333	amp[0] = GetClusterADC(icl)[0];
	334	amp[1] = GetClusterADC(icl)[1];
	335	amp[2] = GetClusterADC(icl)[2];
	336
	337	fGAmp->SetPoint(npg,(Double_t)(time+0.5),(Double_t)(amp[0]+amp[1]+amp[2]));
	338	npg++;
	339
	340	fdQdl += amp[0]+amp[1]+amp[2];
	341
	342	}
	343
	344	fGAmp->Set(npg);
	345
	346	fdQdl /= (Float_t)npg;
	347
	348	return;
	349
	350	}
	351
	352	//_____________________________________________________________________________
e3b2b5e5	353	Float_t AliTRDmcmTracklet::GetClusY(Float_t *adc, Int_t pla) const
0ee00e25	354	{
	355	//
	356	// Cluster position in the phi direction in pad units (relative to the pad border)
	357	//
	358
e3b2b5e5	359	Float_t ypos = 0.0;
0ee00e25	360
e3b2b5e5	361	Float_t a0 = adc[0];
	362	Float_t a1 = adc[1];
	363	Float_t a2 = adc[2];
0ee00e25	364
e3b2b5e5	365	Float_t t1, t2, w1 ,w2;
0ee00e25	366
e3b2b5e5	367	Float_t w = 1.0; // pad units
0ee00e25	368
e3b2b5e5	369	Float_t sigma = 0.0;
0ee00e25	370
	371	switch(pla) {
	372	case 0:
e3b2b5e5	373	sigma = 0.515; break;
0ee00e25	374	case 1:
e3b2b5e5	375	sigma = 0.501; break;
0ee00e25	376	case 2:
e3b2b5e5	377	sigma = 0.491; break;
0ee00e25	378	case 3:
e3b2b5e5	379	sigma = 0.481; break;
0ee00e25	380	case 4:
e3b2b5e5	381	sigma = 0.471; break;
0ee00e25	382	case 5:
e3b2b5e5	383	sigma = 0.463; break;
0ee00e25	384	default:
	385	Error("GetClusY","Wrong plane number.");
	386	return 0.0;
	387	}
	388
e3b2b5e5	389	sigma *= w;
0ee00e25	390
e3b2b5e5	391	t1 = 0.0;
	392	w1 = 0.0;
	393	if( a0 > 0 ) {
	394	w1 = a0*a0;
	395	//w1 = a0;
	396	t1 = w1((sigmasigma)/wTMath::Log(a1/a0)-0.5w);
0ee00e25	397	}
e3b2b5e5	398	t2 = 0.0;
	399	w2 = 0.0;
	400	if( a2 > 0 ) {
	401	w2 = a2*a2;
	402	//w2 = a2;
	403	t2 = w2((sigmasigma)/wTMath::Log(a2/a1)+0.5w);
0ee00e25	404	}
0ee00e25	405
e3b2b5e5	406	ypos = w(t1+t2)/(w1+w2); // range: -0.5w ... +0.5*w
0ee00e25	407
e3b2b5e5	408	return ypos;
0ee00e25	409
	410	}
	411
	412	//_____________________________________________________________________________
	413	void AliTRDmcmTracklet::CookLabel(Float_t frac)
	414	{
	415	//
	416	// Cook the track label from cluster labels
	417	//
	418
	419	const Int_t kMaxTracks = 10;
	420	Int_t trackLabel[kMaxTracks];
	421	Int_t trackCount[kMaxTracks];
	422	for (Int_t it = 0; it < kMaxTracks; it++) {
	423	trackLabel[it] = -1;
	424	trackCount[it] = 0;
	425	}
	426
	427	Bool_t counted;
	428	Int_t label, nTracks = 0;
	429	for (Int_t icl = 0; icl < fNclusters; icl++) {
	430
	431	for (Int_t id = 0; id < kNdict; id++) {
	432
	433	if (fTrack[icl][id] == -1) continue;
	434
	435	label = fTrack[icl][id];
	436
	437	counted = kFALSE;
	438	for (Int_t it = 0; it < nTracks; it++) {
	439	if (label == trackLabel[it]) {
	440	trackCount[it]++;
	441	counted = kTRUE;
	442	break;
	443	}
	444	}
	445	if (!counted) {
	446	trackLabel[nTracks] = label;
	447	trackCount[nTracks]++;
	448	nTracks++;
	449	if (nTracks == kMaxTracks) {
	450	Warning("CookLabel","Too many tracks for this tracklet.");
	451	nTracks--;
	452	break;
	453	}
	454	}
	455
	456	}
	457
	458	}
	459
	460	for (Int_t it = 0; it < kMaxTracks; it++) {
	461	if (trackCount[it] >= (Int_t)(frac*fNclusters)) {
	462	fTrackLabel = trackLabel[it];
	463	break;
	464	}
	465	}
	466
	467	}
	468
	469	//_____________________________________________________________________________
e3b2b5e5	470	Float_t AliTRDmcmTracklet::GetOmegaTau(Float_t vdrift, Float_t field) const
0ee00e25	471	{
	472	//
	473	// Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd>
	474	// and a B-field <b> for Xe/CO2 (15%).
	475	// The values are according to a GARFIELD simulation.
	476	//
	477
	478	//
	479	// Copy of the "AliTRDcalibDB" function, taking as argument the magnetic field too
	480	//
	481
	482	const Int_t kNb = 5;
	483	Float_t p0[kNb] = { 0.004810, 0.007412, 0.010252, 0.013409, 0.016888 };
	484	Float_t p1[kNb] = { 0.054875, 0.081534, 0.107333, 0.131983, 0.155455 };
	485	Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 };
	486	Float_t p3[kNb] = { 0.000155, 0.000238, 0.000330, 0.000428, 0.000541 };
	487
	488	Int_t ib = ((Int_t) (10 * (field - 0.15)));
	489	ib = TMath::Max( 0,ib);
	490	ib = TMath::Min(kNb,ib);
	491
	492	Float_t alphaL = p0[ib]
	493	+ p1[ib] * vdrift
	494	+ p2[ib] * vdrift*vdrift
	495	+ p3[ib] * vdriftvdriftvdrift;
	496
	497	return TMath::Tan(alphaL);
	498
	499	}