TRD/AliTRDclusterizerV1.cxx

   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
  16 /* $Id$ */
  17
  18 ///////////////////////////////////////////////////////////////////////////////
  19 //                                                                           //
  20 // TRD cluster finder for the slow simulator.
  21 //                                                                           //
  22 ///////////////////////////////////////////////////////////////////////////////
  23
  24 #include <TF1.h>
  25 #include <TTree.h>
  26 #include <TH1.h>
  27 #include <TFile.h>
  28
  29 #include "AliRun.h"
  30 #include "AliRunLoader.h"
  31 #include "AliLoader.h"
  32
  33 #include "AliTRDclusterizerV1.h"
  34 #include "AliTRDmatrix.h"
  35 #include "AliTRDgeometry.h"
  36 #include "AliTRDdataArrayF.h"
  37 #include "AliTRDdataArrayI.h"
  38 #include "AliTRDdigitsManager.h"
  39 #include "AliTRDparameter.h"
  40 #include "AliTRDpadPlane.h"
  41
  42 ClassImp(AliTRDclusterizerV1)
  43
  44 //_____________________________________________________________________________
  45 AliTRDclusterizerV1::AliTRDclusterizerV1():AliTRDclusterizer()
  46 {
  47   //
  48   // AliTRDclusterizerV1 default constructor
  49   //
  50
  51   fDigitsManager = 0;
  52
  53 }
  54
  55 //_____________________________________________________________________________
  56 AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t* name, const Text_t* title)
  57                     :AliTRDclusterizer(name,title)
  58 {
  59   //
  60   // AliTRDclusterizerV1 default constructor
  61   //
  62
  63   fDigitsManager = new AliTRDdigitsManager();
  64   fDigitsManager->CreateArrays();
  65
  66 }
  67
  68 //_____________________________________________________________________________
  69 AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c)
  70 :AliTRDclusterizer(c)
  71 {
  72   //
  73   // AliTRDclusterizerV1 copy constructor
  74   //
  75
  76   ((AliTRDclusterizerV1 &) c).Copy(*this);
  77
  78 }
  79
  80 //_____________________________________________________________________________
  81 AliTRDclusterizerV1::~AliTRDclusterizerV1()
  82 {
  83   //
  84   // AliTRDclusterizerV1 destructor
  85   //
  86
  87   if (fDigitsManager) {
  88     delete fDigitsManager;
  89     fDigitsManager = NULL;
  90   }
  91
  92 }
  93
  94 //_____________________________________________________________________________
  95 AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c)
  96 {
  97   //
  98   // Assignment operator
  99   //
 100
 101   if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this);
 102   return *this;
 103
 104 }
 105
 106 //_____________________________________________________________________________
 107 void AliTRDclusterizerV1::Copy(TObject &c) const
 108 {
 109   //
 110   // Copy function
 111   //
 112
 113   ((AliTRDclusterizerV1 &) c).fDigitsManager = 0;
 114
 115   AliTRDclusterizer::Copy(c);
 116
 117 }
 118
 119 //_____________________________________________________________________________
 120 Bool_t AliTRDclusterizerV1::ReadDigits()
 121 {
 122   //
 123   // Reads the digits arrays from the input aliroot file
 124   //
 125
 126   if (!fRunLoader) {
 127     printf("<AliTRDclusterizerV1::ReadDigits> ");
 128     printf("No input file open\n");
 129     return kFALSE;
 130   }
 131   AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
 132   if (!loader->TreeD()) loader->LoadDigits();
 133
 134   // Read in the digit arrays
 135   return (fDigitsManager->ReadDigits(loader->TreeD()));
 136
 137 }
 138
 139 //_____________________________________________________________________________
 140 Bool_t AliTRDclusterizerV1::MakeClusters()
 141 {
 142   //
 143   // Generates the cluster.
 144   //
 145
 146   Int_t row, col, time;
 147
 148   /*
 149   if (fTRD->IsVersion() != 1) {
 150     printf("<AliTRDclusterizerV1::MakeCluster> ");
 151     printf("TRD must be version 1 (slow simulator).\n");
 152     return kFALSE;
 153   }
 154   */
 155
 156   // Get the geometry
 157   AliTRDgeometry *geo = AliTRDgeometry::GetGeometry(fRunLoader);
 158
 159   // Create a default parameter class if none is defined
 160   if (!fPar) {
 161     fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter");
 162     printf("<AliTRDclusterizerV1::MakeCluster> ");
 163     printf("Create the default parameter object.\n");
 164   }
 165   fPar->Init();
 166
 167   //Float_t timeBinSize = fPar->GetDriftVelocity()
 168   //                    / fPar->GetSamplingFrequency();
 169   // Half of ampl.region
 170   //  const Float_t kAmWidth = AliTRDgeometry::AmThick()/2.;
 171
 172   Float_t omegaTau = fPar->GetOmegaTau();
 173   if (fVerbose > 0) {
 174     printf("<AliTRDclusterizerV1::MakeCluster> ");
 175     printf("OmegaTau = %f \n",omegaTau);
 176     printf("<AliTRDclusterizerV1::MakeCluster> ");
 177     printf("Start creating clusters.\n");
 178   }
 179
 180   AliTRDdataArrayI *digits;
 181   AliTRDdataArrayI *track0;
 182   AliTRDdataArrayI *track1;
 183   AliTRDdataArrayI *track2;
 184
 185   // Threshold value for the maximum
 186   Int_t maxThresh = fPar->GetClusMaxThresh();
 187   // Threshold value for the digit signal
 188   Int_t sigThresh = fPar->GetClusSigThresh();
 189   // Iteration limit for unfolding procedure
 190   const Float_t kEpsilon = 0.01;
 191
 192   const Int_t   kNclus   = 3;
 193   const Int_t   kNsig    = 5;
 194   const Int_t   kNtrack  = 3 * kNclus;
 195
 196   Int_t    iType         = 0;
 197   Int_t    iUnfold       = 0;
 198   Double_t ratioLeft     = 1.0;
 199   Double_t ratioRight    = 1.0;
 200
 201   //
 202   Double_t padSignal[kNsig];
 203   Double_t clusterSignal[kNclus];
 204   Double_t clusterPads[kNclus];
 205   Int_t    clusterDigit[kNclus];
 206   Int_t    clusterTracks[kNtrack];
 207
 208   Int_t    chamBeg = 0;
 209   Int_t    chamEnd = AliTRDgeometry::Ncham();
 210   Int_t    planBeg = 0;
 211   Int_t    planEnd = AliTRDgeometry::Nplan();
 212   Int_t    sectBeg = 0;
 213   Int_t    sectEnd = AliTRDgeometry::Nsect();
 214
 215   // Start clustering in every chamber
 216   for (Int_t icham = chamBeg; icham < chamEnd; icham++) {
 217     for (Int_t iplan = planBeg; iplan < planEnd; iplan++) {
 218       for (Int_t isect = sectBeg; isect < sectEnd; isect++) {
 219
 220         Int_t idet = geo->GetDetector(iplan,icham,isect);
 221
 222         Int_t nClusters      = 0;
 223         Int_t nClusters2pad  = 0;
 224         Int_t nClusters3pad  = 0;
 225         Int_t nClusters4pad  = 0;
 226         Int_t nClusters5pad  = 0;
 227         Int_t nClustersLarge = 0;
 228
 229         if (fVerbose > 0) {
 230           printf("<AliTRDclusterizerV1::MakeCluster> ");
 231           printf("Analyzing chamber %d, plane %d, sector %d.\n"
 232                 ,icham,iplan,isect);
 233         }
 234
 235         Int_t    nRowMax     = fPar->GetRowMax(iplan,icham,isect);
 236         Int_t    nColMax     = fPar->GetColMax(iplan);
 237         Int_t    nTimeBefore = fPar->GetTimeBefore();
 238         Int_t    nTimeTotal  = fPar->GetTimeTotal();
 239
 240         AliTRDpadPlane *padPlane = fPar->GetPadPlane(iplan,icham);
 241
 242         // Get the digits
 243         digits = fDigitsManager->GetDigits(idet);
 244         digits->Expand();
 245         track0 = fDigitsManager->GetDictionary(idet,0);
 246         track0->Expand();
 247         track1 = fDigitsManager->GetDictionary(idet,1);
 248         track1->Expand();
 249         track2 = fDigitsManager->GetDictionary(idet,2);
 250         track2->Expand();
 251
 252         // Loop through the chamber and find the maxima
 253         for ( row = 0;  row <  nRowMax;    row++) {
 254           for ( col = 2;  col <  nColMax;    col++) {
 255             //for ( col = 4;  col <  nColMax-2;    col++) {
 256             for (time = 0; time < nTimeTotal; time++) {
 257
 258               Int_t signalL = TMath::Abs(digits->GetDataUnchecked(row,col  ,time));
 259               Int_t signalM = TMath::Abs(digits->GetDataUnchecked(row,col-1,time));
 260               Int_t signalR = TMath::Abs(digits->GetDataUnchecked(row,col-2,time));
 261
 262 //            // Look for the maximum
 263 //               if (signalM >= maxThresh) {
 264 //                 if (((signalL >= sigThresh) &&
 265 //                      (signalL <  signalM))  ||
 266 //                     ((signalR >= sigThresh) &&
 267 //                      (signalR <  signalM))) {
 268 //                   // Maximum found, mark the position by a negative signal
 269 //                   digits->SetDataUnchecked(row,col-1,time,-signalM);
 270 //              }
 271 //            }
 272               // Look for the maximum
 273               if (signalM >= maxThresh) {
 274                 if ( (TMath::Abs(signalL)<=signalM) && (TMath::Abs(signalR)<=signalM) &&
 275                      (TMath::Abs(signalL)+TMath::Abs(signalR))>sigThresh ) {
 276                   // Maximum found, mark the position by a negative signal
 277                   digits->SetDataUnchecked(row,col-1,time,-signalM);
 278                 }
 279               }
 280
 281             }
 282           }
 283         }
 284
 285         // Now check the maxima and calculate the cluster position
 286         for ( row = 0;  row <  nRowMax  ;  row++) {
 287           for (time = 0; time < nTimeTotal; time++) {
 288             for ( col = 1;  col <  nColMax-1;  col++) {
 289
 290               // Maximum found ?
 291               if (digits->GetDataUnchecked(row,col,time) < 0) {
 292
 293                 Int_t iPad;
 294                 for (iPad = 0; iPad < kNclus; iPad++) {
 295                   Int_t iPadCol = col - 1 + iPad;
 296                   clusterSignal[iPad]     = TMath::Abs(digits->GetDataUnchecked(row
 297                                                                                ,iPadCol
 298                                                                                ,time));
 299                   clusterDigit[iPad]      = digits->GetIndexUnchecked(row,iPadCol,time);
 300                   clusterTracks[3*iPad  ] = track0->GetDataUnchecked(row,iPadCol,time) - 1;
 301                   clusterTracks[3*iPad+1] = track1->GetDataUnchecked(row,iPadCol,time) - 1;
 302                   clusterTracks[3*iPad+2] = track2->GetDataUnchecked(row,iPadCol,time) - 1;
 303                 }
 304
 305                 // Count the number of pads in the cluster
 306                 Int_t nPadCount = 0;
 307                 Int_t ii        = 0;
 308                 while (TMath::Abs(digits->GetDataUnchecked(row,col-ii  ,time))
 309                                                                   >= sigThresh) {
 310                   nPadCount++;
 311                   ii++;
 312                   if (col-ii   <        0) break;
 313                 }
 314                 ii = 0;
 315                 while (TMath::Abs(digits->GetDataUnchecked(row,col+ii+1,time))
 316                                                                   >= sigThresh) {
 317                   nPadCount++;
 318                   ii++;
 319                   if (col+ii+1 >= nColMax) break;
 320                 }
 321
 322                 nClusters++;
 323                 switch (nPadCount) {
 324                 case 2:
 325                   iType = 0;
 326                   nClusters2pad++;
 327                   break;
 328                 case 3:
 329                   iType = 1;
 330                   nClusters3pad++;
 331                   break;
 332                 case 4:
 333                   iType = 2;
 334                   nClusters4pad++;
 335                   break;
 336                 case 5:
 337                   iType = 3;
 338                   nClusters5pad++;
 339                   break;
 340                 default:
 341                   iType = 4;
 342                   nClustersLarge++;
 343                   break;
 344                 };
 345
 346                  // Look for 5 pad cluster with minimum in the middle
 347                 Bool_t fivePadCluster = kFALSE;
 348                 if (col < nColMax-3) {
 349                   if (digits->GetDataUnchecked(row,col+2,time) < 0) {
 350                     fivePadCluster = kTRUE;
 351                   }
 352                   if ((fivePadCluster) && (col < nColMax-5)) {
 353                     if (digits->GetDataUnchecked(row,col+4,time) >= sigThresh) {
 354                       fivePadCluster = kFALSE;
 355                     }
 356                   }
 357                   if ((fivePadCluster) && (col >         1)) {
 358                     if (digits->GetDataUnchecked(row,col-2,time) >= sigThresh) {
 359                       fivePadCluster = kFALSE;
 360                     }
 361                   }
 362                 }
 363
 364                 // 5 pad cluster
 365                 // Modify the signal of the overlapping pad for the left part
 366                 // of the cluster which remains from a previous unfolding
 367                 if (iUnfold) {
 368                   clusterSignal[0] *= ratioLeft;
 369                   iType   = 5;
 370                   iUnfold = 0;
 371                 }
 372
 373                 // Unfold the 5 pad cluster
 374                 if (fivePadCluster) {
 375                   for (iPad = 0; iPad < kNsig; iPad++) {
 376                     padSignal[iPad] = TMath::Abs(digits->GetDataUnchecked(row
 377                                                                          ,col-1+iPad
 378                                                                          ,time));
 379                   }
 380                   // Unfold the two maxima and set the signal on
 381                   // the overlapping pad to the ratio
 382                   ratioRight        = Unfold(kEpsilon,iplan,padSignal);
 383                   ratioLeft         = 1.0 - ratioRight;
 384                   clusterSignal[2] *= ratioRight;
 385                   iType   = 5;
 386                   iUnfold = 1;
 387                 }
 388
 389
 390                 Double_t clusterCharge = clusterSignal[0]
 391                                        + clusterSignal[1]
 392                                        + clusterSignal[2];
 393
 394                 // The position of the cluster
 395                 clusterPads[0] = row + 0.5;
 396                 // Take the shift of the additional time bins into account
 397                 clusterPads[2] = time - nTimeBefore + 0.5;
 398
 399                 if (fPar->LUTOn()) {
 400                   // Calculate the position of the cluster by using the
 401                   // lookup table method
 402                   clusterPads[1] =
 403                                   fPar->LUTposition(iplan,clusterSignal[0]
 404                                                           ,clusterSignal[1]
 405                                                           ,clusterSignal[2]);
 406                 }
 407                 else {
 408                   // Calculate the position of the cluster by using the
 409                   // center of gravity method
 410                   for (Int_t i=0;i<5;i++) padSignal[i]=0;
 411                   padSignal[2] = TMath::Abs(digits->GetDataUnchecked(row,col,time));   // central  pad
 412                   padSignal[1] = TMath::Abs(digits->GetDataUnchecked(row,col-1,time)); // left     pad
 413                   padSignal[3] = TMath::Abs(digits->GetDataUnchecked(row,col+1,time)); // right    pad
 414                   if (col>2 &&TMath::Abs(digits->GetDataUnchecked(row,col-2,time)<padSignal[1])){
 415                     padSignal[0] = TMath::Abs(digits->GetDataUnchecked(row,col-2,time));
 416                   }
 417                   if (col<nColMax-3 &&TMath::Abs(digits->GetDataUnchecked(row,col+2,time)<padSignal[3])){
 418                     padSignal[4] = TMath::Abs(digits->GetDataUnchecked(row,col+2,time));
 419                   }
 420                   clusterPads[1] =  GetCOG(padSignal);
 421                   Double_t check = fPar->LUTposition(iplan,clusterSignal[0]
 422                                                           ,clusterSignal[1]
 423                                                           ,clusterSignal[2]);
 424                   //              Float_t diff = clusterPads[1] -  check;
 425
 426                 }
 427
 428                 Double_t q0 = clusterSignal[0];
 429                 Double_t q1 = clusterSignal[1];
 430                 Double_t q2 = clusterSignal[2];
 431                 Double_t clusterSigmaY2 = (q1*(q0+q2)+4*q0*q2) /
 432                                           (clusterCharge*clusterCharge);
 433
 434                 // Calculate the position and the error
 435                 Double_t colSize = padPlane->GetColSize(col);
 436                 Double_t rowSize = padPlane->GetRowSize(row);
 437                 Double_t clusterPos[3];
 438                 clusterPos[0] = padPlane->GetColPos(col) + (clusterPads[1]-0.5)*colSize;  // MI change
 439                 clusterPos[1] = padPlane->GetRowPos(row) -0.5*rowSize; //MI change
 440                 clusterPos[2] = clusterPads[2];
 441                 Double_t clusterSig[2];
 442                 clusterSig[0] = (clusterSigmaY2 + 1./12.) * colSize*colSize;
 443                 clusterSig[1] = rowSize * rowSize / 12.;
 444                 // Add the cluster to the output array
 445                 AddCluster(clusterPos
 446                           ,idet
 447                           ,clusterCharge
 448                           ,clusterTracks
 449                           ,clusterSig
 450                            ,iType,clusterPads[1]);
 451
 452               }
 453             }
 454           }
 455         }
 456
 457         // Compress the arrays
 458         digits->Compress(1,0);
 459         track0->Compress(1,0);
 460         track1->Compress(1,0);
 461         track2->Compress(1,0);
 462
 463         // Write the cluster and reset the array
 464         WriteClusters(idet);
 465         ResetRecPoints();
 466       }
 467     }
 468   }
 469
 470   if (fVerbose > 0) {
 471     printf("<AliTRDclusterizerV1::MakeCluster> ");
 472     printf("Done.\n");
 473   }
 474
 475   return kTRUE;
 476
 477 }
 478
 479 Double_t AliTRDclusterizerV1::GetCOG(Double_t signal[5])
 480 {
 481   //
 482   // get COG position
 483   // used for clusters with more than 3 pads - where LUT not applicable
 484   Double_t sum = signal[0]+signal[1]+signal[2]+signal[3]+signal[4];
 485   Double_t res = (0.0*(-signal[0]+signal[4])+(-signal[1]+signal[3]))/sum;
 486   return res;
 487 }
 488
 489
 490
 491 //_____________________________________________________________________________
 492 Double_t AliTRDclusterizerV1::Unfold(Double_t eps, Int_t plane, Double_t* padSignal)
 493 {
 494   //
 495   // Method to unfold neighbouring maxima.
 496   // The charge ratio on the overlapping pad is calculated
 497   // until there is no more change within the range given by eps.
 498   // The resulting ratio is then returned to the calling method.
 499   //
 500
 501   Int_t   irc                = 0;
 502   Int_t   itStep             = 0;      // Count iteration steps
 503
 504   Double_t ratio             = 0.5;    // Start value for ratio
 505   Double_t prevRatio         = 0;      // Store previous ratio
 506
 507   Double_t newLeftSignal[3]  = {0};    // Array to store left cluster signal
 508   Double_t newRightSignal[3] = {0};    // Array to store right cluster signal
 509   Double_t newSignal[3]      = {0};
 510
 511   // Start the iteration
 512   while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
 513
 514     itStep++;
 515     prevRatio = ratio;
 516
 517     // Cluster position according to charge ratio
 518     Double_t maxLeft  = (ratio*padSignal[2] - padSignal[0])
 519                       / (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
 520     Double_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2])
 521                       / ((1-ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
 522
 523     // Set cluster charge ratio
 524     irc = fPar->PadResponse(1.0,maxLeft ,plane,newSignal);
 525     Double_t ampLeft  = padSignal[1] / newSignal[1];
 526     irc = fPar->PadResponse(1.0,maxRight,plane,newSignal);
 527     Double_t ampRight = padSignal[3] / newSignal[1];
 528
 529     // Apply pad response to parameters
 530     irc = fPar->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
 531     irc = fPar->PadResponse(ampRight,maxRight,plane,newRightSignal);
 532
 533     // Calculate new overlapping ratio
 534     ratio = TMath::Min((Double_t)1.0,newLeftSignal[2] /
 535                           (newLeftSignal[2] + newRightSignal[0]));
 536
 537   }
 538
 539   return ratio;
 540
 541 }
 542