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 #include "AliRawReader.h"
  33
  34 #include "AliTRDclusterizerV1.h"
  35 #include "AliTRDmatrix.h"
  36 #include "AliTRDgeometry.h"
  37 #include "AliTRDdataArrayF.h"
  38 #include "AliTRDdataArrayI.h"
  39 #include "AliTRDdigitsManager.h"
  40 #include "AliTRDparameter.h"
  41 #include "AliTRDpadPlane.h"
  42 #include "AliTRDrawData.h"
  43 #include "AliTRDcalibDB.h"
  44 #include "AliTRDRecParam.h"
  45 #include "AliTRDCommonParam.h"
  46 #include "AliTRDcluster.h"
  47
  48 ClassImp(AliTRDclusterizerV1)
  49
  50 //_____________________________________________________________________________
  51 AliTRDclusterizerV1::AliTRDclusterizerV1():AliTRDclusterizer()
  52 {
  53   //
  54   // AliTRDclusterizerV1 default constructor
  55   //
  56
  57   fDigitsManager = 0;
  58
  59 }
  60
  61 //_____________________________________________________________________________
  62 AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t* name, const Text_t* title)
  63                     :AliTRDclusterizer(name,title)
  64 {
  65   //
  66   // AliTRDclusterizerV1 default constructor
  67   //
  68
  69   fDigitsManager = new AliTRDdigitsManager();
  70   fDigitsManager->CreateArrays();
  71
  72 }
  73
  74 //_____________________________________________________________________________
  75 AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c)
  76 :AliTRDclusterizer(c)
  77 {
  78   //
  79   // AliTRDclusterizerV1 copy constructor
  80   //
  81
  82   ((AliTRDclusterizerV1 &) c).Copy(*this);
  83
  84 }
  85
  86 //_____________________________________________________________________________
  87 AliTRDclusterizerV1::~AliTRDclusterizerV1()
  88 {
  89   //
  90   // AliTRDclusterizerV1 destructor
  91   //
  92
  93   if (fDigitsManager) {
  94     delete fDigitsManager;
  95     fDigitsManager = NULL;
  96   }
  97
  98 }
  99
 100 //_____________________________________________________________________________
 101 AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c)
 102 {
 103   //
 104   // Assignment operator
 105   //
 106
 107   if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this);
 108   return *this;
 109
 110 }
 111
 112 //_____________________________________________________________________________
 113 void AliTRDclusterizerV1::Copy(TObject &c) const
 114 {
 115   //
 116   // Copy function
 117   //
 118
 119   ((AliTRDclusterizerV1 &) c).fDigitsManager = 0;
 120
 121   AliTRDclusterizer::Copy(c);
 122
 123 }
 124
 125 //_____________________________________________________________________________
 126 Bool_t AliTRDclusterizerV1::ReadDigits()
 127 {
 128   //
 129   // Reads the digits arrays from the input aliroot file
 130   //
 131
 132   if (!fRunLoader) {
 133     printf("<AliTRDclusterizerV1::ReadDigits> ");
 134     printf("No input file open\n");
 135     return kFALSE;
 136   }
 137   AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
 138   if (!loader->TreeD()) loader->LoadDigits();
 139
 140   // Read in the digit arrays
 141   return (fDigitsManager->ReadDigits(loader->TreeD()));
 142
 143 }
 144
 145 //_____________________________________________________________________________
 146 Bool_t AliTRDclusterizerV1::ReadDigits(AliRawReader* rawReader)
 147 {
 148   //
 149   // Reads the digits arrays from the ddl file
 150   //
 151
 152   AliTRDrawData *raw = new AliTRDrawData();
 153   raw->SetDebug(1);
 154
 155   fDigitsManager = raw->Raw2Digits(rawReader);
 156
 157   return kTRUE;
 158
 159 }
 160
 161 //_____________________________________________________________________________
 162 Bool_t AliTRDclusterizerV1::MakeClusters()
 163 {
 164   //
 165   // Generates the cluster.
 166   //
 167
 168   Int_t row, col, time;
 169
 170   /*
 171   if (fTRD->IsVersion() != 1) {
 172     printf("<AliTRDclusterizerV1::MakeCluster> ");
 173     printf("TRD must be version 1 (slow simulator).\n");
 174     return kFALSE;
 175   }
 176   */
 177
 178   // Get the geometry
 179   AliTRDgeometry *geo = AliTRDgeometry::GetGeometry(fRunLoader);
 180
 181   // Create a default parameter class if none is defined
 182   if (!fPar) {
 183     fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter");
 184     printf("<AliTRDclusterizerV1::MakeCluster> ");
 185     printf("Create the default parameter object.\n");
 186   }
 187   fPar->Init();
 188
 189   AliTRDcalibDB* calibration = AliTRDcalibDB::Instance();
 190   if (!calibration)
 191   {
 192     printf("<AliTRDclusterizerMI::MakeCluster> ");
 193     printf("ERROR getting instance of AliTRDcalibDB");
 194     return kFALSE;
 195   }
 196
 197   AliTRDRecParam* recParam = AliTRDRecParam::Instance();
 198   if (!recParam)
 199   {
 200     printf("<AliTRDclusterizerMI::MakeCluster> ");
 201     printf("ERROR getting instance of AliTRDRecParam");
 202     return kFALSE;
 203   }
 204
 205   AliTRDCommonParam* commonParam = AliTRDCommonParam::Instance();
 206   if (!commonParam)
 207   {
 208     printf("<AliTRDdigitizer::MakeDigits> ");
 209     printf("Could not get common params\n");
 210     return kFALSE;
 211   }
 212
 213   //Float_t timeBinSize = fPar->GetDriftVelocity()
 214   //                    / fPar->GetSamplingFrequency();
 215   // Half of ampl.region
 216   //  const Float_t kAmWidth = AliTRDgeometry::AmThick()/2.;
 217
 218   //Float_t omegaTau = fPar->GetOmegaTau();
 219   if (fVerbose > 0) {
 220     //printf("<AliTRDclusterizerV1::MakeCluster> ");
 221     //printf("OmegaTau = %f \n",omegaTau);
 222     printf("<AliTRDclusterizerV1::MakeCluster> ");
 223     printf("Start creating clusters.\n");
 224   }
 225
 226   AliTRDdataArrayI *digits;
 227   AliTRDdataArrayI *track0;
 228   AliTRDdataArrayI *track1;
 229   AliTRDdataArrayI *track2;
 230
 231   // Threshold value for the maximum
 232   Int_t maxThresh = recParam->GetClusMaxThresh();
 233   // Threshold value for the digit signal
 234   Int_t sigThresh = recParam->GetClusSigThresh();
 235   // Iteration limit for unfolding procedure
 236   const Float_t kEpsilon = 0.01;
 237
 238   const Int_t   kNclus   = 3;
 239   const Int_t   kNsig    = 5;
 240   const Int_t   kNtrack  = 3 * kNclus;
 241
 242   Int_t    iType         = 0;
 243   Int_t    iUnfold       = 0;
 244   Double_t ratioLeft     = 1.0;
 245   Double_t ratioRight    = 1.0;
 246
 247   //
 248   Double_t padSignal[kNsig];
 249   Double_t clusterSignal[kNclus];
 250   Double_t clusterPads[kNclus];
 251   Int_t    clusterDigit[kNclus];
 252   Int_t    clusterTracks[kNtrack];
 253
 254   Int_t    chamBeg = 0;
 255   Int_t    chamEnd = AliTRDgeometry::Ncham();
 256   Int_t    planBeg = 0;
 257   Int_t    planEnd = AliTRDgeometry::Nplan();
 258   Int_t    sectBeg = 0;
 259   Int_t    sectEnd = AliTRDgeometry::Nsect();
 260
 261   // Start clustering in every chamber
 262   for (Int_t icham = chamBeg; icham < chamEnd; icham++) {
 263     for (Int_t iplan = planBeg; iplan < planEnd; iplan++) {
 264       for (Int_t isect = sectBeg; isect < sectEnd; isect++) {
 265
 266         Int_t idet = geo->GetDetector(iplan,icham,isect);
 267
 268         Int_t nClusters      = 0;
 269         Int_t nClusters2pad  = 0;
 270         Int_t nClusters3pad  = 0;
 271         Int_t nClusters4pad  = 0;
 272         Int_t nClusters5pad  = 0;
 273         Int_t nClustersLarge = 0;
 274
 275         if (fVerbose > 0) {
 276           printf("<AliTRDclusterizerV1::MakeCluster> ");
 277           printf("Analyzing chamber %d, plane %d, sector %d.\n"
 278                 ,icham,iplan,isect);
 279         }
 280
 281         Int_t    nRowMax     = commonParam->GetRowMax(iplan,icham,isect);
 282         Int_t    nColMax     = commonParam->GetColMax(iplan);
 283         Int_t    nTimeTotal  = calibration->GetNumberOfTimeBins();
 284
 285         AliTRDpadPlane *padPlane = commonParam->GetPadPlane(iplan,icham);
 286
 287         // Get the digits
 288         digits = fDigitsManager->GetDigits(idet);
 289         digits->Expand();
 290         track0 = fDigitsManager->GetDictionary(idet,0);
 291         track0->Expand();
 292         track1 = fDigitsManager->GetDictionary(idet,1);
 293         track1->Expand();
 294         track2 = fDigitsManager->GetDictionary(idet,2);
 295         track2->Expand();
 296
 297         // Loop through the chamber and find the maxima
 298         for ( row = 0;  row <  nRowMax;    row++) {
 299           for ( col = 2;  col <  nColMax;    col++) {
 300             //for ( col = 4;  col <  nColMax-2;    col++) {
 301             for (time = 0; time < nTimeTotal; time++) {
 302
 303               Int_t signalL = TMath::Abs(digits->GetDataUnchecked(row,col  ,time));
 304               Int_t signalM = TMath::Abs(digits->GetDataUnchecked(row,col-1,time));
 305               Int_t signalR = TMath::Abs(digits->GetDataUnchecked(row,col-2,time));
 306
 307 //            // Look for the maximum
 308 //               if (signalM >= maxThresh) {
 309 //                 if (((signalL >= sigThresh) &&
 310 //                      (signalL <  signalM))  ||
 311 //                     ((signalR >= sigThresh) &&
 312 //                      (signalR <  signalM))) {
 313 //                   // Maximum found, mark the position by a negative signal
 314 //                   digits->SetDataUnchecked(row,col-1,time,-signalM);
 315 //              }
 316 //            }
 317               // Look for the maximum
 318               if (signalM >= maxThresh) {
 319                 if ( (TMath::Abs(signalL)<=signalM) && (TMath::Abs(signalR)<=signalM) &&
 320                      (TMath::Abs(signalL)+TMath::Abs(signalR))>sigThresh ) {
 321                   // Maximum found, mark the position by a negative signal
 322                   digits->SetDataUnchecked(row,col-1,time,-signalM);
 323                 }
 324               }
 325
 326             }
 327           }
 328         }
 329
 330         // Now check the maxima and calculate the cluster position
 331         for ( row = 0;  row <  nRowMax  ;  row++) {
 332           for (time = 0; time < nTimeTotal; time++) {
 333             for ( col = 1;  col <  nColMax-1;  col++) {
 334
 335               // Maximum found ?
 336               if (digits->GetDataUnchecked(row,col,time) < 0) {
 337
 338                 Int_t iPad;
 339                 for (iPad = 0; iPad < kNclus; iPad++) {
 340                   Int_t iPadCol = col - 1 + iPad;
 341                   clusterSignal[iPad]     = TMath::Abs(digits->GetDataUnchecked(row
 342                                                                                ,iPadCol
 343                                                                                ,time));
 344                   clusterDigit[iPad]      = digits->GetIndexUnchecked(row,iPadCol,time);
 345                   clusterTracks[3*iPad  ] = track0->GetDataUnchecked(row,iPadCol,time) - 1;
 346                   clusterTracks[3*iPad+1] = track1->GetDataUnchecked(row,iPadCol,time) - 1;
 347                   clusterTracks[3*iPad+2] = track2->GetDataUnchecked(row,iPadCol,time) - 1;
 348                 }
 349
 350                 // Count the number of pads in the cluster
 351                 Int_t nPadCount = 0;
 352                 Int_t ii        = 0;
 353                 while (TMath::Abs(digits->GetDataUnchecked(row,col-ii  ,time))
 354                                                                   >= sigThresh) {
 355                   nPadCount++;
 356                   ii++;
 357                   if (col-ii   <        0) break;
 358                 }
 359                 ii = 0;
 360                 while (TMath::Abs(digits->GetDataUnchecked(row,col+ii+1,time))
 361                                                                   >= sigThresh) {
 362                   nPadCount++;
 363                   ii++;
 364                   if (col+ii+1 >= nColMax) break;
 365                 }
 366
 367                 nClusters++;
 368                 switch (nPadCount) {
 369                 case 2:
 370                   iType = 0;
 371                   nClusters2pad++;
 372                   break;
 373                 case 3:
 374                   iType = 1;
 375                   nClusters3pad++;
 376                   break;
 377                 case 4:
 378                   iType = 2;
 379                   nClusters4pad++;
 380                   break;
 381                 case 5:
 382                   iType = 3;
 383                   nClusters5pad++;
 384                   break;
 385                 default:
 386                   iType = 4;
 387                   nClustersLarge++;
 388                   break;
 389                 };
 390
 391                  // Look for 5 pad cluster with minimum in the middle
 392                 Bool_t fivePadCluster = kFALSE;
 393                 if (col < nColMax-3) {
 394                   if (digits->GetDataUnchecked(row,col+2,time) < 0) {
 395                     fivePadCluster = kTRUE;
 396                   }
 397                   if ((fivePadCluster) && (col < nColMax-5)) {
 398                     if (digits->GetDataUnchecked(row,col+4,time) >= sigThresh) {
 399                       fivePadCluster = kFALSE;
 400                     }
 401                   }
 402                   if ((fivePadCluster) && (col >         1)) {
 403                     if (digits->GetDataUnchecked(row,col-2,time) >= sigThresh) {
 404                       fivePadCluster = kFALSE;
 405                     }
 406                   }
 407                 }
 408
 409                 // 5 pad cluster
 410                 // Modify the signal of the overlapping pad for the left part
 411                 // of the cluster which remains from a previous unfolding
 412                 if (iUnfold) {
 413                   clusterSignal[0] *= ratioLeft;
 414                   iType   = 5;
 415                   iUnfold = 0;
 416                 }
 417
 418                 // Unfold the 5 pad cluster
 419                 if (fivePadCluster) {
 420                   for (iPad = 0; iPad < kNsig; iPad++) {
 421                     padSignal[iPad] = TMath::Abs(digits->GetDataUnchecked(row
 422                                                                          ,col-1+iPad
 423                                                                          ,time));
 424                   }
 425                   // Unfold the two maxima and set the signal on
 426                   // the overlapping pad to the ratio
 427                   ratioRight        = Unfold(kEpsilon,iplan,padSignal);
 428                   ratioLeft         = 1.0 - ratioRight;
 429                   clusterSignal[2] *= ratioRight;
 430                   iType   = 5;
 431                   iUnfold = 1;
 432                 }
 433
 434
 435                 Double_t clusterCharge = clusterSignal[0]
 436                                        + clusterSignal[1]
 437                                        + clusterSignal[2];
 438
 439                 // The position of the cluster
 440                 clusterPads[0] = row + 0.5;
 441                 // Take the shift of the additional time bins into account
 442                 clusterPads[2] = time + 0.5;
 443
 444                 // correct for t0
 445                 clusterPads[2] -= calibration->GetT0(idet, col, row);
 446
 447                 if (recParam->LUTOn()) {
 448                   // Calculate the position of the cluster by using the
 449                   // lookup table method
 450                   clusterPads[1] =
 451                       recParam->LUTposition(iplan,clusterSignal[0]
 452                                                           ,clusterSignal[1]
 453                                                           ,clusterSignal[2]);
 454                 }
 455                 else {
 456                   // Calculate the position of the cluster by using the
 457                   // center of gravity method
 458                   for (Int_t i=0;i<5;i++) padSignal[i]=0;
 459                   padSignal[2] = TMath::Abs(digits->GetDataUnchecked(row,col,time));   // central  pad
 460                   padSignal[1] = TMath::Abs(digits->GetDataUnchecked(row,col-1,time)); // left     pad
 461                   padSignal[3] = TMath::Abs(digits->GetDataUnchecked(row,col+1,time)); // right    pad
 462                   if (col>2 &&TMath::Abs(digits->GetDataUnchecked(row,col-2,time)<padSignal[1])){
 463                     padSignal[0] = TMath::Abs(digits->GetDataUnchecked(row,col-2,time));
 464                   }
 465                   if (col<nColMax-3 &&TMath::Abs(digits->GetDataUnchecked(row,col+2,time)<padSignal[3])){
 466                     padSignal[4] = TMath::Abs(digits->GetDataUnchecked(row,col+2,time));
 467                   }
 468                   clusterPads[1] =  GetCOG(padSignal);
 469                   //Double_t check = fPar->LUTposition(iplan,clusterSignal[0]
 470                   //                                        ,clusterSignal[1]
 471                   //                                        ,clusterSignal[2]);
 472                   //              Float_t diff = clusterPads[1] -  check;
 473
 474                 }
 475
 476                 Double_t q0 = clusterSignal[0];
 477                 Double_t q1 = clusterSignal[1];
 478                 Double_t q2 = clusterSignal[2];
 479                 Double_t clusterSigmaY2 = (q1*(q0+q2)+4*q0*q2) /
 480                                           (clusterCharge*clusterCharge);
 481
 482                 Float_t vdrift = calibration->GetVdrift(idet, col, row);
 483
 484                 // Calculate the position and the error
 485                 Double_t colSize = padPlane->GetColSize(col);
 486                 Double_t rowSize = padPlane->GetRowSize(row);
 487                 Double_t clusterPos[3];
 488                 clusterPos[0] = padPlane->GetColPos(col) + (clusterPads[1]-0.5)*colSize;  // MI change
 489                 clusterPos[1] = padPlane->GetRowPos(row) -0.5*rowSize; //MI change
 490                 clusterPos[2] = CalcXposFromTimebin(clusterPads[2], vdrift);
 491                 Double_t clusterSig[2];
 492                 clusterSig[0] = (clusterSigmaY2 + 1./12.) * colSize*colSize;
 493                 clusterSig[1] = rowSize * rowSize / 12.;
 494
 495
 496                 // Add the cluster to the output array
 497                 AliTRDcluster * cluster = AddCluster(clusterPos
 498                           ,(Int_t) clusterPads[2]
 499                           ,idet
 500                           ,clusterCharge
 501                           ,clusterTracks
 502                           ,clusterSig
 503                            ,iType,clusterPads[1]);
 504                 //
 505                 //
 506                 Short_t signals[7]={0,0,0,0,0,0,0};
 507                 for (Int_t jPad = col-3;jPad<=col+3;jPad++){
 508                   if (jPad<0 ||jPad>=nColMax-1) continue;
 509                   signals[jPad-col+3] =  TMath::Abs(digits->GetDataUnchecked(row,jPad,time));
 510                 }
 511                 cluster->SetSignals(signals);
 512               }
 513             }
 514           }
 515         }
 516
 517         // Compress the arrays
 518         digits->Compress(1,0);
 519         track0->Compress(1,0);
 520         track1->Compress(1,0);
 521         track2->Compress(1,0);
 522
 523         // Write the cluster and reset the array
 524         WriteClusters(idet);
 525         ResetRecPoints();
 526       }
 527     }
 528   }
 529
 530   if (fVerbose > 0) {
 531     printf("<AliTRDclusterizerV1::MakeCluster> ");
 532     printf("Done.\n");
 533   }
 534
 535   return kTRUE;
 536
 537 }
 538
 539 Double_t AliTRDclusterizerV1::GetCOG(Double_t signal[5])
 540 {
 541   //
 542   // get COG position
 543   // used for clusters with more than 3 pads - where LUT not applicable
 544   Double_t sum = signal[0]+signal[1]+signal[2]+signal[3]+signal[4];
 545   Double_t res = (0.0*(-signal[0]+signal[4])+(-signal[1]+signal[3]))/sum;
 546   return res;
 547 }
 548
 549
 550
 551 //_____________________________________________________________________________
 552 Double_t AliTRDclusterizerV1::Unfold(Double_t eps, Int_t plane, Double_t* padSignal)
 553 {
 554   //
 555   // Method to unfold neighbouring maxima.
 556   // The charge ratio on the overlapping pad is calculated
 557   // until there is no more change within the range given by eps.
 558   // The resulting ratio is then returned to the calling method.
 559   //
 560
 561   AliTRDCommonParam* commonParam = AliTRDCommonParam::Instance();
 562   if (!commonParam)
 563   {
 564     printf("<AliTRDdigitizer::MakeDigits> ");
 565     printf("Could not get common params\n");
 566     return kFALSE;
 567   }
 568
 569   Int_t   irc                = 0;
 570   Int_t   itStep             = 0;      // Count iteration steps
 571
 572   Double_t ratio             = 0.5;    // Start value for ratio
 573   Double_t prevRatio         = 0;      // Store previous ratio
 574
 575   Double_t newLeftSignal[3]  = {0};    // Array to store left cluster signal
 576   Double_t newRightSignal[3] = {0};    // Array to store right cluster signal
 577   Double_t newSignal[3]      = {0};
 578
 579   // Start the iteration
 580   while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
 581
 582     itStep++;
 583     prevRatio = ratio;
 584
 585     // Cluster position according to charge ratio
 586     Double_t maxLeft  = (ratio*padSignal[2] - padSignal[0])
 587                       / (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
 588     Double_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2])
 589                       / ((1-ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
 590
 591     // Set cluster charge ratio
 592     irc = commonParam->PadResponse(1.0,maxLeft ,plane,newSignal);
 593     Double_t ampLeft  = padSignal[1] / newSignal[1];
 594     irc = commonParam->PadResponse(1.0,maxRight,plane,newSignal);
 595     Double_t ampRight = padSignal[3] / newSignal[1];
 596
 597     // Apply pad response to parameters
 598     irc = commonParam->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
 599     irc = commonParam->PadResponse(ampRight,maxRight,plane,newRightSignal);
 600
 601     // Calculate new overlapping ratio
 602     ratio = TMath::Min((Double_t)1.0,newLeftSignal[2] /
 603                           (newLeftSignal[2] + newRightSignal[0]));
 604
 605   }
 606
 607   return ratio;
 608
 609 }
 610