ITS/AliITSClusterFinderSDD.cxx

   1
   2 /**************************************************************************
   3  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   4  *                                                                        *
   5  * Author: The ALICE Off-line Project.                                    *
   6  * Contributors are mentioned in the code where appropriate.              *
   7  *                                                                        *
   8  * Permission to use, copy, modify and distribute this software and its   *
   9  * documentation strictly for non-commercial purposes is hereby granted   *
  10  * without fee, provided that the above copyright notice appears in all   *
  11  * copies and that both the copyright notice and this permission notice   *
  12  * appear in the supporting documentation. The authors make no claims     *
  13  * about the suitability of this software for any purpose. It is          *
  14  * provided "as is" without express or implied warranty.                  *
  15  **************************************************************************/
  16
  17 #include <iostream.h>
  18
  19 #include <TFile.h>
  20 #include <TMath.h>
  21 #include <math.h>
  22
  23 #include "AliITSClusterFinderSDD.h"
  24 #include "AliITSMapA1.h"
  25 #include "AliITS.h"
  26 #include "AliITSdigit.h"
  27 #include "AliITSRawCluster.h"
  28 #include "AliITSRecPoint.h"
  29 #include "AliITSsegmentation.h"
  30 #include "AliITSresponseSDD.h"
  31 #include "AliRun.h"
  32
  33
  34
  35 ClassImp(AliITSClusterFinderSDD)
  36
  37 //----------------------------------------------------------
  38 AliITSClusterFinderSDD::AliITSClusterFinderSDD
  39 (AliITSsegmentation *seg, AliITSresponse *response, TClonesArray *digits, TClonesArray *recp)
  40 {
  41   // standard constructor
  42
  43     fSegmentation=seg;
  44     fResponse=response;
  45     fDigits=digits;
  46     fClusters=recp;
  47     fNclusters= fClusters->GetEntriesFast();
  48     SetCutAmplitude();
  49     SetDAnode();
  50     SetDTime();
  51     SetMinPeak();
  52     SetMinNCells();
  53     SetMaxNCells();
  54     SetTimeCorr();
  55     SetMinCharge();
  56     fMap=new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
  57
  58 }
  59
  60 //_____________________________________________________________________________
  61 AliITSClusterFinderSDD::AliITSClusterFinderSDD()
  62 {
  63   // default constructor
  64     fSegmentation=0;
  65     fResponse=0;
  66     fDigits=0;
  67     fClusters=0;
  68     fNclusters=0;
  69     fMap=0;
  70     fCutAmplitude=0;
  71     SetDAnode();
  72     SetDTime();
  73     SetMinPeak();
  74     SetMinNCells();
  75     SetMaxNCells();
  76     SetTimeCorr();
  77     SetMinCharge();
  78
  79 }
  80
  81 //_____________________________________________________________________________
  82 AliITSClusterFinderSDD::~AliITSClusterFinderSDD()
  83 {
  84     // destructor
  85
  86     if(fMap) delete fMap;
  87
  88 }
  89
  90 //_____________________________________________________________________________
  91
  92 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma)
  93 {
  94   // set the signal threshold for cluster finder
  95
  96    Float_t baseline,noise;
  97    fResponse->GetNoiseParam(noise,baseline);
  98    Float_t noise_after_el = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
  99    fCutAmplitude=(Int_t)(baseline + nsigma*noise_after_el);
 100 }
 101 //_____________________________________________________________________________
 102
 103 void AliITSClusterFinderSDD::Find1DClusters()
 104 {
 105   // find 1D clusters
 106
 107   AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 108
 109   // retrieve the parameters
 110   Int_t fNofMaps = fSegmentation->Npz();
 111   Int_t fMaxNofSamples = fSegmentation->Npx();
 112   Int_t fNofAnodes = fNofMaps/2;
 113   Int_t dummy=0;
 114   Float_t fTimeStep = fSegmentation->Dpx(dummy);
 115   Float_t fSddLength = fSegmentation->Dx();
 116   Float_t fDriftSpeed = fResponse->DriftSpeed();
 117
 118   Float_t anodePitch = fSegmentation->Dpz(dummy);
 119   // map the signal
 120   fMap->SetThreshold(fCutAmplitude);
 121
 122   fMap->FillMap();
 123
 124   Float_t noise;
 125   Float_t baseline;
 126   fResponse->GetNoiseParam(noise,baseline);
 127
 128   Int_t nofFoundClusters = 0;
 129   Int_t i;
 130   Float_t **dfadc = new Float_t*[fNofAnodes];
 131   for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 132   Float_t fadc = 0.;
 133   Float_t fadc1 = 0.;
 134   Float_t fadc2 = 0.;
 135   Int_t j,k,idx,l,m;
 136   for(j=0;j<2;j++) {
 137     for(k=0;k<fNofAnodes;k++) {
 138       idx = j*fNofAnodes+k;
 139       // signal (fadc) & derivative (dfadc)
 140       dfadc[k][255]=0.;
 141       for(l=0; l<fMaxNofSamples; l++) {
 142         fadc2=(Float_t)fMap->GetSignal(idx,l);
 143         if(l>0) fadc1=(Float_t)fMap->GetSignal(idx,l-1);
 144         if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 145       } // samples
 146     } // anodes
 147
 148     for(k=0;k<fNofAnodes;k++) {
 149       //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 150       idx = j*fNofAnodes+k;
 151
 152       Int_t imax = 0;
 153       Int_t imaxd = 0;
 154       Int_t it=0;
 155       while(it <= fMaxNofSamples-3) {
 156
 157         imax = it;
 158         imaxd = it;
 159         // maximum of signal
 160
 161         Float_t fadcmax = 0.;
 162         Float_t dfadcmax = 0.;
 163         Int_t lthrmina = 1;
 164         Int_t lthrmint = 3;
 165
 166         Int_t lthra = 1;
 167         Int_t lthrt = 0;
 168
 169         for(m=0;m<20;m++) {
 170           Int_t id = it+m;
 171           if(id>=fMaxNofSamples) break;
 172           fadc=(float)fMap->GetSignal(idx,id);
 173           if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 174           if(fadc > (float)fCutAmplitude) {
 175             lthrt++;
 176           }
 177
 178           if(dfadc[k][id] > dfadcmax) {
 179             dfadcmax = dfadc[k][id];
 180             imaxd = id;
 181           }
 182         }
 183         it = imaxd;
 184
 185         if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 186
 187         // cluster charge
 188         Int_t tstart = it-2;
 189         if(tstart < 0) tstart = 0;
 190
 191         Bool_t ilcl = 0;
 192         if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 193
 194         if(ilcl) {
 195           nofFoundClusters++;
 196
 197           Int_t tstop = tstart;
 198           Float_t dfadcmin = 10000.;
 199           Int_t ij;
 200           for(ij=0; ij<20; ij++) {
 201             if(tstart+ij > 255) { tstop = 255; break; }
 202             fadc=(float)fMap->GetSignal(idx,tstart+ij);
 203             if((dfadc[k][tstart+ij] < dfadcmin) && (fadc > fCutAmplitude)) {
 204               tstop = tstart+ij+5;
 205               if(tstop > 255) tstop = 255;
 206               dfadcmin = dfadc[k][it+ij];
 207             }
 208           }
 209
 210           Float_t clusterCharge = 0.;
 211           Float_t clusterAnode = k+0.5;
 212           Float_t clusterTime = 0.;
 213           Float_t clusterMult = 0.;
 214           Float_t clusterPeakAmplitude = 0.;
 215           Int_t its,peakpos=-1;
 216           Float_t n, baseline;
 217           fResponse->GetNoiseParam(n,baseline);
 218           for(its=tstart; its<=tstop; its++) {
 219             fadc=(float)fMap->GetSignal(idx,its);
 220             if(fadc>baseline)
 221               fadc-=baseline;
 222             else
 223               fadc=0.;
 224             clusterCharge += fadc;
 225             // as a matter of fact we should take the peak pos before FFT
 226             // to get the list of tracks !!!
 227             if(fadc > clusterPeakAmplitude) {
 228               clusterPeakAmplitude = fadc;
 229               //peakpos=fMap->GetHitIndex(idx,its);
 230               Int_t shift=(int)(fTimeCorr/fTimeStep);
 231               if(its>shift && its<(fMaxNofSamples-shift)) peakpos=fMap->GetHitIndex(idx,its+shift);
 232               else peakpos=fMap->GetHitIndex(idx,its);
 233               if(peakpos<0) peakpos=fMap->GetHitIndex(idx,its);
 234             }
 235             clusterTime += fadc*its;
 236             if(fadc > 0) clusterMult++;
 237             if(its == tstop) {
 238               clusterTime /= (clusterCharge/fTimeStep);   // ns
 239               if(clusterTime > fTimeCorr) clusterTime -= fTimeCorr;   // ns
 240             }
 241           }
 242
 243           Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*anodePitch;
 244           Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 245           clusterDriftPath = fSddLength-clusterDriftPath;
 246
 247           if(clusterCharge <= 0.) break;
 248           AliITSRawClusterSDD clust(j+1,clusterAnode,clusterTime,clusterCharge,clusterPeakAmplitude,peakpos,0.,0.,clusterDriftPath,clusteranodePath,clusterMult,0,0,0,0,0,0,0);
 249           iTS->AddCluster(1,&clust);
 250           it = tstop;
 251         } // ilcl
 252
 253         it++;
 254
 255       } // while (samples)
 256     } // anodes
 257   } // detectors (2)
 258
 259   //fMap->ClearMap();
 260
 261   for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 262   delete [] dfadc;
 263
 264   return;
 265
 266 }
 267
 268 //_____________________________________________________________________________
 269
 270 void AliITSClusterFinderSDD::Find1DClustersE()
 271 {
 272     // find 1D clusters
 273
 274         AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 275
 276         // retrieve the parameters
 277         Int_t fNofMaps = fSegmentation->Npz();
 278         Int_t fMaxNofSamples = fSegmentation->Npx();
 279         Int_t fNofAnodes = fNofMaps/2;
 280         Int_t dummy=0;
 281         Float_t fTimeStep = fSegmentation->Dpx( dummy );
 282         Float_t fSddLength = fSegmentation->Dx();
 283         Float_t fDriftSpeed = fResponse->DriftSpeed();
 284         Float_t anodePitch = fSegmentation->Dpz( dummy );
 285         Float_t n, baseline;
 286         fResponse->GetNoiseParam( n, baseline );
 287
 288         // map the signal
 289         fMap->SetThreshold( fCutAmplitude );
 290         fMap->FillMap();
 291         Int_t nClu = 0;
 292
 293 //      cout << "Search  cluster... "<< endl;
 294         for( Int_t j=0; j<2; j++ )
 295         {
 296         for( Int_t k=0; k<fNofAnodes; k++ )
 297                 {
 298                 Int_t idx = j*fNofAnodes+k;
 299
 300                         Bool_t on = kFALSE;
 301                         Int_t start = 0;
 302                         Int_t nTsteps = 0;
 303                         Float_t fmax = 0.;
 304                         Int_t lmax = 0;
 305                         Float_t charge = 0.;
 306                         Float_t time = 0.;
 307                         Float_t anode = k+0.5;
 308                         Int_t peakpos = -1;
 309
 310                 for( Int_t l=0; l<fMaxNofSamples; l++ )
 311                         {
 312                                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 313                                 if( fadc > 0.0 )
 314                                 {
 315                                         if( on == kFALSE && l<fMaxNofSamples-4)  // star RawCluster (reset var.)
 316                                         {
 317                                                 Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 318                                                 if( fadc1 < fadc ) continue;
 319                                                 start = l;
 320                                                 fmax = 0.;
 321                                                 lmax = 0;
 322                                                 time = 0.;
 323                                                 charge = 0.;
 324                                                 on = kTRUE;
 325                                                 nTsteps = 0;
 326                                         }
 327
 328                                         nTsteps++ ;
 329                                         if( fadc > baseline )
 330                                         fadc -= baseline;
 331                                 else
 332                                         fadc=0.;
 333
 334                                 charge += fadc;
 335                                         time += fadc*l;
 336
 337                                         if( fadc > fmax )
 338                                         {
 339                                                 fmax = fadc;
 340                                                 lmax = l;
 341                                                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 342                             if( l > shift && l < (fMaxNofSamples-shift) )
 343                                                         peakpos = fMap->GetHitIndex( idx, l+shift );
 344                                         else
 345                                                         peakpos = fMap->GetHitIndex( idx, l );
 346                                             if( peakpos < 0 ) peakpos = fMap->GetHitIndex( idx, l );
 347                                         }
 348                                 }
 349                                 else
 350                                 {
 351                                         if( on == kTRUE )
 352                                         {
 353                                                 if( nTsteps > 2 ) //  min # of timesteps for a RawCluster
 354                                                 {
 355                                                         // Found a RawCluster...
 356                                                         Int_t stop = l-1;
 357                                                         time /= (charge/fTimeStep);   // ns
 358                                 //                      time = lmax*fTimeStep;   // ns
 359                                                         if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 360                                                         Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 361                                                         Float_t driftPath = time*fDriftSpeed;
 362                                                         driftPath = fSddLength-driftPath;
 363                                                         AliITSRawClusterSDD clust( j+1, anode, time, charge,
 364                                     fmax, peakpos, 0., 0., driftPath, anodePath, nTsteps
 365                                                         , start, stop, start, stop, 1, k, k );
 366                                                         iTS->AddCluster( 1, &clust );
 367                                                 //      clust.PrintInfo();
 368                                                         nClu++;
 369                                                 }
 370                                                 on = kFALSE;
 371                                         }
 372                                 }
 373                 } // samples
 374         } // anodes
 375         } // wings
 376
 377 //      cout << "# Rawclusters " << nClu << endl;
 378         return;
 379
 380 }
 381
 382 //_____________________________________________________________________________
 383
 384 Int_t AliITSClusterFinderSDD::SearchPeak( Float_t *spect, Int_t xdim, Int_t zdim,
 385                                                                                   Int_t *peakX, Int_t *peakZ, Float_t *peakAmp, Float_t minpeak )
 386 {
 387         // search peaks on a 2D cluster
 388         Int_t npeak = 0;    // # peaks
 389     Int_t i,j;
 390
 391         // search peaks
 392         for( Int_t z=1; z<zdim-1; z++ )
 393         {
 394                 for( Int_t x=2; x<xdim-3; x++ )
 395                 {
 396                         Float_t sxz = spect[x*zdim+z];
 397                         Float_t sxz1 = spect[(x+1)*zdim+z];
 398                         Float_t sxz2 = spect[(x-1)*zdim+z];
 399
 400                         // search a local max. in s[x,z]
 401                         if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 402                         if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 403                                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 404                                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 405                                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] )
 406                         {
 407                                 // peak found
 408                                 peakX[npeak] = x;
 409                                 peakZ[npeak] = z;
 410                                 peakAmp[npeak] = sxz;
 411                                 npeak++;
 412                         }
 413                 }
 414         }
 415
 416         // search groups of peaks with same amplitude.
 417         Int_t *flag = new Int_t[npeak];
 418         for( i=0; i<npeak; i++ ) flag[i] = 0;
 419         for( i=0; i<npeak; i++ )
 420         {
 421                 for( j=0; j<npeak; j++ )
 422                 {
 423                         if( i==j) continue;
 424                         if( flag[j] > 0 ) continue;
 425                         if( peakAmp[i] == peakAmp[j] && TMath::Abs(peakX[i]-peakX[j])<=1 && TMath::Abs(peakZ[i]-peakZ[j])<=1 )
 426                         {
 427                                 if( flag[i] == 0) flag[i] = i+1;
 428                                 flag[j] = flag[i];
 429                         }
 430                 }
 431         }
 432
 433         // make average of peak groups
 434         for( i=0; i<npeak; i++ )
 435         {
 436                 Int_t nFlag = 1;
 437                 if( flag[i] <= 0 ) continue;
 438                 for( j=0; j<npeak; j++ )
 439                 {
 440                         if( i==j ) continue;
 441                         if( flag[j] != flag[i] ) continue;
 442                         peakX[i] += peakX[j];
 443                         peakZ[i] += peakZ[j];
 444                         nFlag++;
 445                         npeak--;
 446                         for( Int_t k=j; k<npeak; k++ )
 447                         {
 448                                 peakX[k] = peakX[k+1];
 449                                 peakZ[k] = peakZ[k+1];
 450                                 peakAmp[k] = peakAmp[k+1];
 451                                 flag[k] = flag[k+1];
 452                         }
 453                         j--;
 454                 }
 455
 456                 if( nFlag > 1 )
 457                 {
 458                         peakX[i] /= nFlag;
 459                         peakZ[i] /= nFlag;
 460                 }
 461         }
 462
 463         delete [] flag;
 464         return( npeak );
 465 }
 466
 467
 468 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par, Float_t *spe, Float_t
 469 *integral)
 470 {
 471     // function used to fit the clusters
 472     // par -> paramiters..
 473     // par[0]  number of peaks.
 474     // for each peak i=1, ..., par[0]
 475     //          par[i] = Ampl.
 476     //          par[i+1] = xpos
 477     //          par[i+2] = zpos
 478     //          par[i+3] = tau
 479     //          par[i+4] = sigma.
 480
 481     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 482     const Int_t knParam = 5;
 483     Int_t npeak = (Int_t)par[0];
 484
 485     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 486
 487     Int_t k = 1;
 488     for( Int_t i=0; i<npeak; i++ )
 489     {
 490         if( integral != 0 ) integral[i] = 0.;
 491         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 492         Float_t T2 = par[k+3];   // PASCAL
 493         if( electronics == 2 ) { T2 *= T2; T2 *= 2; } // OLA
 494         for( Int_t z=0; z<zdim; z++ )
 495         {
 496             for( Int_t x=0; x<xdim; x++ )
 497             {
 498                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 499                 Float_t x2 = 0.;
 500                 Float_t signal = 0.;
 501                 if( electronics == 1 ) // PASCAL
 502                 {
 503                     x2 = (x-par[k+1]+T2)/T2;
 504                     signal = (x2 > 0.) ? par[k] * x2 * exp( -x2+1. - z2 ) : 0.0;
 505                 //  signal = (x2 > 0.) ? par[k] * x2*x2 * exp( -2*x2+2. - z2 ) : 0.0; // RCCR
 506                 }
 507                 else
 508                     if( electronics == 2 ) // OLA
 509                     {
 510                         x2 = (x-par[k+1])*(x-par[k+1])/T2;
 511                         signal = par[k]  * exp( -x2 - z2 );
 512                     }
 513                     else
 514                     {
 515                         cout << "Wrong SDD Electronics =" << electronics << endl;
 516                         // exit( 1 );
 517                     }
 518                 spe[x*zdim+z] += signal;
 519                 if( integral != 0 ) integral[i] += signal;
 520             }
 521         }
 522         k += knParam;
 523     }
 524     return;
 525 }
 526
 527
 528 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe, Float_t *speFit )
 529 {
 530         // EVALUATES UNNORMALIZED CHI-SQUARED
 531
 532         Float_t chi2 = 0.;
 533         for( Int_t z=0; z<zdim; z++ )
 534         {
 535                 for( Int_t x=1; x<xdim-1; x++ )
 536                 {
 537                         Int_t index = x*zdim+z;
 538                         Float_t tmp = spe[index] - speFit[index];
 539                         chi2 += tmp*tmp;
 540                 }
 541         }
 542         return( chi2 );
 543 }
 544
 545
 546 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param, Float_t *prm0, Float_t *steprm, Float_t *chisqr,
 547                 Float_t *spe, Float_t *speFit )
 548 {
 549         //
 550         Int_t   k, nnn, mmm, i;
 551         Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 552
 553         const Int_t knParam = 5;
 554         Int_t npeak = (Int_t)param[0];
 555         for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 556
 557         for( k=1; k<(npeak*knParam+1); k++ )
 558         {
 559                 p1 = param[k];
 560                 delta = steprm[k];
 561                 d1 = delta;
 562
 563                 // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 564                 if( fabs( p1 ) > 1.0E-6 )
 565                         if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 566                 else  delta = (Float_t)1.0E-4;
 567
 568                 //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 569                 PeakFunc( xdim, zdim, param, speFit );
 570                 chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 571
 572                 p2 = p1+delta;
 573                 param[k] = p2;
 574
 575                 PeakFunc( xdim, zdim, param, speFit );
 576                 chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 577
 578                 if( chisq1 < chisq2 )
 579                 {
 580         // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 581                 delta = -delta;
 582                 t = p1;
 583                 p1 = p2;
 584                 p2 = t;
 585                 t = chisq1;
 586                 chisq1 = chisq2;
 587                 chisq2 = t;
 588         }
 589
 590                 i = 1; nnn = 0;
 591                 do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 592                 nnn++;
 593                         p3 = p2 + delta;
 594                 mmm = nnn - (nnn/5)*5;  // multiplo de 5
 595                 if( mmm == 0 )
 596                         {
 597                         d1 = delta;
 598                         // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 599                         delta *= 5;
 600                 }
 601                 param[k] = p3;
 602
 603                         // Constrain paramiters
 604                         Int_t kpos = (k-1) % knParam;
 605                         switch( kpos )
 606                         {
 607                                 case 0 :
 608                                         if( param[k] <= 20 ) param[k] = fMinPeak;
 609                                 case 1 :
 610                                         if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 611                                 case 2 :
 612                                         if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 613                                 case 3 :
 614                                         if( param[k] < .5 ) param[k] = .5;
 615                                 case 4 :
 616                                         if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 617                         };
 618
 619                         PeakFunc( xdim, zdim, param, speFit );
 620                         chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 621
 622                 if( chisq3 < chisq2 && nnn < 50 )
 623                         {
 624                                 p1 = p2;
 625                         p2 = p3;
 626                         chisq1 = chisq2;
 627                         chisq2 = chisq3;
 628                 }
 629                 else i=0;
 630
 631         } while( i );
 632
 633                 // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 634                 a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 635                 b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 636                 if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 637                   else p0 = 10000;
 638
 639                 //---IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 640                 //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 641                 //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 642
 643                 //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 644                 //if( fabs( p2-p0 ) > dp ) p0 = p2;
 645                 param[k] = p0;
 646
 647                 // Constrain paramiters
 648                 Int_t kpos = (k-1) % knParam;
 649                 switch( kpos )
 650                 {
 651                         case 0 :
 652                                 if( param[k] <= 20 ) param[k] = fMinPeak;
 653                         case 1 :
 654                                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 655                         case 2 :
 656                                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 657                         case 3 :
 658                                 if( param[k] < .5 ) param[k] = .5;
 659                         case 4 :
 660                                 if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 661                 };
 662
 663                 PeakFunc( xdim, zdim, param, speFit );
 664                 chisqt = ChiSqr( xdim, zdim, spe, speFit );
 665
 666                 // DO NOT ALLOW ERRONEOUS INTERPOLATION
 667                 if( chisqt <= *chisqr )
 668                         *chisqr = chisqt;
 669                 else
 670                         param[k] = prm0[k];
 671
 672                 // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 673                 steprm[k] = (param[k]-prm0[k])/5;
 674                 if( steprm[k] >= d1 ) steprm[k] = d1/5;
 675         }
 676
 677         // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 678         PeakFunc( xdim, zdim, param, speFit );
 679         *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 680         return;
 681 }
 682
 683
 684 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim, Float_t *param, Float_t *spe, Int_t *niter, Float_t *chir )
 685 {
 686         // fit method from Comput. Phys. Commun 46(1987) 149
 687         const Float_t kchilmt = 0.01;              //   relative accuracy
 688         const Int_t   knel = 3;                            //   for parabolic minimization
 689         const Int_t   knstop = 50;                         //   Max. iteration number
 690         const Int_t   knParam = 5;
 691
 692         Int_t npeak = (Int_t)param[0];
 693
 694         // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 695         if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 696         Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 697
 698         Int_t   n, k, iterNum = 0;
 699         Float_t *prm0 = new Float_t[npeak*knParam+1];
 700         Float_t *step = new Float_t[npeak*knParam+1];
 701         Float_t *schi = new Float_t[npeak*knParam+1];
 702         Float_t *sprm[3];
 703         sprm[0] = new Float_t[npeak*knParam+1];
 704         sprm[1] = new Float_t[npeak*knParam+1];
 705         sprm[2] = new Float_t[npeak*knParam+1];
 706
 707         Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 708
 709         Float_t *speFit = new Float_t[ xdim*zdim ];
 710         PeakFunc( xdim, zdim, param, speFit );
 711         chi0 = ChiSqr( xdim, zdim, spe, speFit );
 712         chi1 = chi0;
 713
 714
 715         for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 716
 717         for( k=1 ; k<(npeak*knParam+1); k+=knParam )
 718         {
 719         step[k] = param[k] / 20.0 ;
 720         step[k+1] = param[k+1] / 50.0;
 721                 step[k+2] = param[k+2] / 50.0;
 722         step[k+3] = param[k+3] / 20.0;
 723         step[k+4] = param[k+4] / 20.0;
 724     }
 725
 726         Int_t out = 0;
 727         do
 728         {
 729             iterNum++;
 730         chi0 = chi1;
 731
 732         Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 733         reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 734
 735             // EXIT conditions
 736                 if( reldif < (float) kchilmt )
 737                 {
 738                         *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 739                 *niter = iterNum;
 740                         out = 0;
 741                         break;
 742         }
 743
 744         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) )
 745                 {
 746                 *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 747                 *niter = iterNum;
 748                         out = 0;
 749                         break;
 750         }
 751
 752         if( iterNum > 5*knstop )
 753                 {
 754                 *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 755                 *niter = iterNum;
 756                         out = 1;
 757                         break;
 758         }
 759
 760         if( iterNum <= knel ) continue;
 761
 762         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 763         if( n > 3 || n == 0 ) continue;
 764         schi[n-1] = chi1;
 765         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 766         if( n != 3 ) continue;
 767
 768                 //   -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 769                 //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 770
 771         for( k=1; k<(npeak*knParam+1); k++ )
 772                 {
 773                 Float_t tmp0 = sprm[0][k];
 774                 Float_t tmp1 = sprm[1][k];
 775                 Float_t tmp2 = sprm[2][k];
 776                 a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 777                 a += (schi[2]*(tmp0-tmp1));
 778                 b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 779                 b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*(tmp0*tmp0-tmp1*tmp1)));
 780                 if ((double)a < 1.0E-6) prmin = 0;
 781                            else prmin = (float) (0.5*b/a);
 782                 dp = 5*(tmp2-tmp0);
 783
 784                 if (fabs(prmin-tmp2) > fabs(dp)) prmin = tmp2+dp;
 785                 param[k] = prmin;
 786                 step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 787         }
 788
 789         } while( kTRUE );
 790
 791         delete [] prm0;
 792         delete [] step;
 793         delete [] schi;
 794         delete [] sprm[0];
 795         delete [] sprm[1];
 796         delete [] sprm[2];
 797         delete [] speFit;
 798
 799         return( out );
 800 }
 801 //_____________________________________________________________________________
 802 void AliITSClusterFinderSDD::ResolveClustersE()
 803 {
 804         // The function to resolve clusters if the clusters overlapping exists
 805
 806     Int_t i;
 807
 808         AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 809         // get number of clusters for this module
 810         Int_t nofClusters = fClusters->GetEntriesFast();
 811         nofClusters -= fNclusters;
 812
 813         Int_t fNofMaps = fSegmentation->Npz();
 814         Int_t fNofAnodes = fNofMaps/2;
 815         Int_t fMaxNofSamples = fSegmentation->Npx();
 816         Int_t dummy=0;
 817         Double_t fTimeStep = fSegmentation->Dpx( dummy );
 818         Double_t fSddLength = fSegmentation->Dx();
 819         Double_t fDriftSpeed = fResponse->DriftSpeed();
 820         Double_t anodePitch = fSegmentation->Dpz( dummy );
 821         Float_t n, baseline;
 822         fResponse->GetNoiseParam( n, baseline );
 823         Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 824
 825         // fill Map of signals
 826         fMap->FillMap();
 827
 828         for( Int_t j=0; j<nofClusters; j++ )
 829         {
 830                 // get cluster information
 831                 AliITSRawClusterSDD *clusterJ = (AliITSRawClusterSDD*) fClusters->At( j );
 832                 Int_t astart = clusterJ->Astart();
 833                 Int_t astop = clusterJ->Astop();
 834                 Int_t tstart = clusterJ->Tstartf();
 835                 Int_t tstop = clusterJ->Tstopf();
 836                 Int_t wing = (Int_t)clusterJ->W();
 837                 if( wing == 2 )
 838                 {
 839                         astart += fNofAnodes;
 840                         astop  += fNofAnodes;
 841                 }
 842                 Int_t xdim = tstop-tstart+3;
 843                 Int_t zdim = astop-astart+3;
 844                 Float_t *sp = new Float_t[ xdim*zdim+1 ];
 845                 memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 846
 847                 // make a local map from cluster region
 848                 for( Int_t ianode=astart; ianode<=astop; ianode++ )
 849                 {
 850                         for( Int_t itime=tstart; itime<=tstop; itime++ )
 851                         {
 852                                 Float_t fadc = fMap->GetSignal( ianode, itime );
 853                                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 854                                 else fadc = 0.;
 855                                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 856                                 sp[index] = fadc;
 857                         } // time loop
 858                 } // anode loop
 859
 860                 // search peaks on cluster
 861                 const Int_t kNp = 150;
 862                 Int_t peakX1[kNp];
 863                 Int_t peakZ1[kNp];
 864                 Float_t peakAmp1[kNp];
 865                 Int_t npeak = SearchPeak( sp, xdim, zdim, peakX1, peakZ1, peakAmp1, fMinPeak );
 866
 867                 // if multiple peaks, split cluster
 868                 if( npeak >= 1 )
 869                 {
 870                 //      cout << "npeak " << npeak << endl;
 871                 //      clusterJ->PrintInfo();
 872
 873                         Float_t *par = new Float_t[npeak*5+1];
 874                         par[0] = (Float_t)npeak;
 875
 876                         // Initial paramiters in cell dimentions
 877                         Int_t k1 = 1;
 878                         for( i=0; i<npeak; i++ )
 879                         {
 880                                 par[k1] = peakAmp1[i];
 881                                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 882                                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 883                                 if( electronics == 1 )
 884                                 par[k1+3] = 2.; // PASCAL
 885                                 else if( electronics == 2 )
 886                                 par[k1+3] = 0.7; // tau [timebin]  OLA
 887                                 par[k1+4] = .4;    // sigma     [anodepich]
 888                                 k1+=5;
 889                         }
 890                         Int_t niter;
 891                         Float_t chir;
 892                         NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 893
 894                         Float_t peakX[kNp];
 895                         Float_t peakZ[kNp];
 896                         Float_t sigma[kNp];
 897                         Float_t tau[kNp];
 898                         Float_t peakAmp[kNp];
 899                         Float_t integral[kNp];
 900
 901                         //get integrals => charge for each peak
 902                         PeakFunc( xdim, zdim, par, sp, integral );
 903
 904                         k1 = 1;
 905                         for( i=0; i<npeak; i++ )
 906                         {
 907                                 peakAmp[i] = par[k1];
 908                                 peakX[i] = par[k1+1];
 909                                 peakZ[i] = par[k1+2];
 910                                 tau[i] = par[k1+3];
 911                                 sigma[i] = par[k1+4];
 912                                 k1+=5;
 913                         }
 914
 915                         // calculate paramiter for new clusters
 916                         for( i=0; i<npeak; i++ )
 917                         {
 918                                 AliITSRawClusterSDD clusterI( *clusterJ );
 919                                 Int_t newAnode = peakZ1[i]-1 + astart;
 920                                 Int_t newiTime = peakX1[i]-1 + tstart;
 921
 922                                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 923                                 if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )  shift = 0;
 924                                 Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 925                                 clusterI.SetPeakPos( peakpos );
 926                                 clusterI.SetPeakAmpl( peakAmp1[i] );
 927
 928                                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 929                                 Float_t newiTimef = peakX[i] - 1 + tstart;
 930                                 if( wing == 2 ) newAnodef -= fNofAnodes;
 931                                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 932                                 newiTimef *= fTimeStep;
 933                                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 934                                 if( electronics == 1 )
 935                                 {
 936                                     newiTimef *= 0.999438;    // PASCAL
 937                                     newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 938                                 }
 939                                 else if( electronics == 2 )
 940                                     newiTimef *= 0.99714;    // OLA
 941
 942                                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 943                                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 944                                 clusterI.SetX( driftPath*sign * 0.0001 );
 945                                 clusterI.SetZ( anodePath * 0.0001 );
 946                                 clusterI.SetAnode( newAnodef );
 947                                 clusterI.SetTime( newiTimef );
 948                                 clusterI.SetAsigma( sigma[i]*anodePitch );
 949                                 clusterI.SetTsigma( tau[i]*fTimeStep );
 950                                 clusterI.SetQ( integral[i] );
 951
 952                         //      clusterI.PrintInfo();
 953                                 iTS->AddCluster( 1, &clusterI );
 954                         }
 955                         fClusters->RemoveAt( j );
 956                         delete [] par;
 957                 }
 958                 else cout <<" --- Peak not found!!!!  minpeak=" << fMinPeak<<
 959                             " cluster peak=" << clusterJ->PeakAmpl() << endl << endl;
 960
 961                 delete [] sp;
 962         } // cluster loop
 963
 964         fClusters->Compress();
 965         fMap->ClearMap();
 966 }
 967
 968
 969 //_____________________________________________________________________________
 970 void  AliITSClusterFinderSDD::GroupClusters()
 971 {
 972   // group clusters
 973   Int_t dummy=0;
 974   Float_t fTimeStep = fSegmentation->Dpx(dummy);
 975
 976
 977   // get number of clusters for this module
 978   Int_t nofClusters = fClusters->GetEntriesFast();
 979   nofClusters -= fNclusters;
 980
 981   AliITSRawClusterSDD *clusterI;
 982   AliITSRawClusterSDD *clusterJ;
 983
 984   Int_t *label = new Int_t [nofClusters];
 985   Int_t i,j;
 986   for(i=0; i<nofClusters; i++) label[i] = 0;
 987   for(i=0; i<nofClusters; i++) {
 988     if(label[i] != 0) continue;
 989     for(j=i+1; j<nofClusters; j++) {
 990       if(label[j] != 0) continue;
 991       clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 992       clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 993       // 1.3 good
 994       if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 995       if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 996       Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 997       if(!pair) continue;
 998       //      clusterI->PrintInfo();
 999       //      clusterJ->PrintInfo();
1000       clusterI->Add(clusterJ);
1001       label[j] = 1;
1002       fClusters->RemoveAt(j);
1003       j=i; // <- Ernesto
1004     } // J clusters
1005     label[i] = 1;
1006   } // I clusters
1007   fClusters->Compress();
1008
1009   delete [] label;
1010   return;
1011
1012 }
1013
1014 //_____________________________________________________________________________
1015
1016 void AliITSClusterFinderSDD::SelectClusters()
1017 {
1018   // get number of clusters for this module
1019   Int_t nofClusters = fClusters->GetEntriesFast();
1020   nofClusters -= fNclusters;
1021
1022   Int_t i;
1023   for(i=0; i<nofClusters; i++) {
1024     AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
1025     Int_t rmflg = 0;
1026     Float_t wy = 0.;
1027     if(clusterI->Anodes() != 0.) {
1028       wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
1029     }
1030     Int_t amp = (Int_t) clusterI->PeakAmpl();
1031     Int_t cha = (Int_t) clusterI->Q();
1032     if(amp < fMinPeak) rmflg = 1;
1033     if(cha < fMinCharge) rmflg = 1;
1034     if(wy < fMinNCells) rmflg = 1;
1035     //if(wy > fMaxNCells) rmflg = 1;
1036     if(rmflg) fClusters->RemoveAt(i);
1037   } // I clusters
1038   fClusters->Compress();
1039   return;
1040
1041 }
1042
1043 //_____________________________________________________________________________
1044
1045 void AliITSClusterFinderSDD::ResolveClusters()
1046 {
1047 /*
1048 // The function to resolve clusters if the clusters overlapping exists
1049
1050    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1051
1052   // get number of clusters for this module
1053    Int_t nofClusters = fClusters->GetEntriesFast();
1054    nofClusters -= fNclusters;
1055    //   cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","<<fNclusters<<endl;
1056
1057    Int_t fNofMaps = fSegmentation->Npz();
1058    Int_t fNofAnodes = fNofMaps/2;
1059    Int_t dummy=0;
1060    Double_t fTimeStep = fSegmentation->Dpx(dummy);
1061    Double_t fSddLength = fSegmentation->Dx();
1062    Double_t fDriftSpeed = fResponse->DriftSpeed();
1063    Double_t anodePitch = fSegmentation->Dpz(dummy);
1064    Float_t n, baseline;
1065    fResponse->GetNoiseParam(n,baseline);
1066    Float_t dzz_1A = anodePitch * anodePitch / 12;
1067
1068   // fill Map of signals
1069     fMap->FillMap();
1070
1071   Int_t j,i,ii,ianode,anode,itime;
1072   Int_t wing,astart,astop,tstart,tstop,nanode;
1073   Double_t fadc,ClusterTime;
1074   Double_t q[400],x[400],z[400]; // digit charges and coordinates
1075
1076   for(j=0; j<nofClusters; j++) {
1077
1078     AliITSRawClusterSDD *clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
1079
1080     Int_t ndigits = 0;
1081     astart=clusterJ->Astart();
1082     astop=clusterJ->Astop();
1083     tstart=clusterJ->Tstartf();
1084     tstop=clusterJ->Tstopf();
1085     nanode=clusterJ->Anodes();  // <- Ernesto
1086     wing=(Int_t)clusterJ->W();
1087     if(wing == 2) {
1088         astart += fNofAnodes;
1089         astop  += fNofAnodes;
1090     }
1091
1092 //          cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","<<tstart<<","<<tstop<<endl;
1093
1094             // clear the digit arrays
1095    for(ii=0; ii<400; ii++) {
1096        q[ii] = 0.;
1097        x[ii] = 0.;
1098        z[ii] = 0.;
1099    }
1100
1101    for(ianode=astart; ianode<=astop; ianode++) {
1102     for(itime=tstart; itime<=tstop; itime++) {
1103           fadc=fMap->GetSignal(ianode,itime);
1104           if(fadc>baseline) {
1105             fadc-=(Double_t)baseline;
1106               q[ndigits] = fadc*(fTimeStep/160);  // KeV
1107               anode = ianode;
1108               if(wing == 2) anode -= fNofAnodes;
1109               z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
1110               ClusterTime = itime*fTimeStep;
1111               if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;   // ns
1112               x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
1113               if(wing == 1) x[ndigits] *= (-1);
1114 //              cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","<<fadc<<endl;
1115 //            cout<<"wing,anode,ndigits,charge ="<<wing<<","<<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
1116               ndigits++;
1117               continue;
1118           }
1119               fadc=0;
1120               //              cout<<"fadc=0, ndigits ="<<ndigits<<endl;
1121     } // time loop
1122    } // anode loop
1123    //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
1124
1125
1126    // Fit cluster to resolve for two separate ones --------------------
1127
1128    Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
1129    Double_t dxx=0., dzz=0., dxz=0.;
1130    Double_t scl = 0., tmp, tga, elps = -1.;
1131    Double_t xfit[2], zfit[2], qfit[2];
1132    Double_t pitchz = anodePitch*1.e-4;             // cm
1133    Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
1134    Double_t sigma2;
1135    Int_t nfhits;
1136    Int_t nbins = ndigits;
1137    Int_t separate = 0;
1138
1139    // now, all lengths are in microns
1140
1141    for (ii=0; ii<nbins; ii++) {
1142        qq += q[ii];
1143        xm += x[ii]*q[ii];
1144        zm += z[ii]*q[ii];
1145        xx += x[ii]*x[ii]*q[ii];
1146        zz += z[ii]*z[ii]*q[ii];
1147        xz += x[ii]*z[ii]*q[ii];
1148    }
1149
1150    xm /= qq;
1151    zm /= qq;
1152    xx /= qq;
1153    zz /= qq;
1154    xz /= qq;
1155
1156    dxx = xx - xm*xm;
1157    dzz = zz - zm*zm;
1158    dxz = xz - xm*zm;
1159
1160    // shrink the cluster in the time direction proportionaly to the
1161    // dxx/dzz, which lineary depends from the drift path
1162
1163         // new  Ernesto........
1164    if( nanode == 1 )
1165    {
1166            dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
1167            scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
1168    }
1169    if( nanode == 2 )
1170    {
1171            scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1172    }
1173
1174    if( nanode == 3 )
1175    {
1176            scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1177    }
1178
1179    if( nanode > 3 )
1180    {
1181            scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
1182    }
1183
1184    //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","<<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
1185
1186  //  old Boris.........
1187  //  tmp=29730. - 585.*fabs(xm/1000.);
1188  //  scl=TMath::Sqrt(tmp/130000.);
1189
1190    xm *= scl;
1191    xx *= scl*scl;
1192    xz *= scl;
1193
1194
1195    dxx = xx - xm*xm;
1196 //   dzz = zz - zm*zm;
1197    dxz = xz - xm*zm;
1198
1199    //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","<<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1200
1201 //   if(dzz < 7200.) dzz = 7200.; // for one anode cluster dzz = anode**2/12
1202
1203    if (dxx < 0.) dxx=0.;
1204
1205    // the data if no cluster overlapping (the coordunates are in cm)
1206    nfhits = 1;
1207    xfit[0] = xm*1.e-4;
1208    zfit[0] = zm*1.e-4;
1209    qfit[0] = qq;
1210
1211 //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1212
1213    if (nbins >= 7) {
1214       if (dxz==0.) tga=0.;
1215       else {
1216          tmp=0.5*(dzz-dxx)/dxz;
1217          tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) : tmp+TMath::Sqrt(tmp*tmp+1);
1218       }
1219       elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1220
1221       // change from microns to cm
1222       xm *= 1.e-4;
1223       zm *= 1.e-4;
1224       zz *= 1.e-8;
1225       xx *= 1.e-8;
1226       xz *= 1.e-8;
1227       dxz *= 1.e-8;
1228       dxx *= 1.e-8;
1229       dzz *= 1.e-8;
1230
1231    //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","<<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1232
1233      for (i=0; i<nbins; i++) {
1234        x[i] = x[i] *= scl;
1235        x[i] = x[i] *= 1.e-4;
1236        z[i] = z[i] *= 1.e-4;
1237      }
1238
1239      //     cout<<"!!! elps ="<<elps<<endl;
1240
1241      if (elps < 0.3) { // try to separate hits
1242          separate = 1;
1243          tmp=atan(tga);
1244          Double_t cosa=cos(tmp),sina=sin(tmp);
1245          Double_t a1=0., x1=0., xxx=0.;
1246          for (i=0; i<nbins; i++) {
1247              tmp=x[i]*cosa + z[i]*sina;
1248              if (q[i] > a1) {
1249                 a1=q[i];
1250                 x1=tmp;
1251              }
1252              xxx += tmp*tmp*tmp*q[i];
1253          }
1254          xxx /= qq;
1255          Double_t z12=-sina*xm + cosa*zm;
1256          sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1257          xm=cosa*xm + sina*zm;
1258          xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1259          Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1260          Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1261          for (i=0; i<33; i++) { // solve a system of equations
1262              Double_t x1_old=x1, x2_old=x2, r_old=r;
1263              Double_t c11=x1-x2;
1264              Double_t c12=r;
1265              Double_t c13=1-r;
1266              Double_t c21=x1*x1 - x2*x2;
1267              Double_t c22=2*r*x1;
1268              Double_t c23=2*(1-r)*x2;
1269              Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1270              Double_t c32=3*r*(sigma2 + x1*x1);
1271              Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1272              Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1273              Double_t f2=-(r*(sigma2 + x1*x1) + (1-r)*(sigma2 + x2*x2) - xx);
1274              Double_t f3=-(r*x1*(3*sigma2+x1*x1) + (1-r)*x2*(3*sigma2+x2*x2)-xxx);
1275              Double_t d=c11*c22*c33 + c21*c32*c13 + c12*c23*c31 - c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1276              if (d==0.) {
1277                 cout<<"*********** d=0 ***********\n";
1278                 break;
1279              }
1280              Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1281                        f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1282              Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1283                        c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1284              Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1285                        c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1286              r  += dr/d;
1287              x1 += d1/d;
1288              x2 += d2/d;
1289
1290              if (fabs(x1-x1_old) > 0.0001) continue;
1291              if (fabs(x2-x2_old) > 0.0001) continue;
1292              if (fabs(r-r_old)/5 > 0.001) continue;
1293
1294              a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1295              Double_t a2=a1*(1-r)/r;
1296              qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina + z12*cosa;
1297              qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina + z12*cosa;
1298              nfhits=2;
1299              break; // Ok !
1300          }
1301          if (i==33) cerr<<"No more iterations ! "<<endl;
1302     } // end of attempt to separate overlapped clusters
1303    } // end of nbins cut
1304
1305    if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1306    if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="<<elps<<","<<nfhits<<endl;
1307    if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1308
1309    for (i=0; i<nfhits; i++) {
1310        xfit[i] *= (1.e+4/scl);
1311        if(wing == 1) xfit[i] *= (-1);
1312        zfit[i] *= 1.e+4;
1313        //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","<<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1314    }
1315
1316     Int_t ncl = nfhits;
1317     if(nfhits == 1 && separate == 1) {
1318       cout<<"!!!!! no separate"<<endl;
1319       ncl = -2;
1320     }
1321
1322    if(nfhits == 2) {
1323      cout << "Split cluster: " << endl;
1324      clusterJ->PrintInfo();
1325      cout << " in: " << endl;
1326      for (i=0; i<nfhits; i++) {
1327
1328         // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,-1,(Float_t)qfit[i],ncl,0,0,(Float_t)xfit[i],(Float_t)zfit[i],0,0,0,0,tstart,tstop,astart,astop);
1329         //      AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,-1,(Float_t)qfit[i],0,0,0,(Float_t)xfit[i],(Float_t)zfit[i],0,0,0,0,tstart,tstop,astart,astop,ncl);
1330
1331         // ???????????
1332        // if(wing == 1) xfit[i] *= (-1);
1333               Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1334               Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1335         Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1336         Float_t peakpos = clusterJ->PeakPos();
1337
1338         Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1339         Float_t clusterDriftPath = Time*fDriftSpeed;
1340         clusterDriftPath = fSddLength-clusterDriftPath;
1341
1342         AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,Time,qfit[i],
1343                                     clusterPeakAmplitude,peakpos,0.,0.,clusterDriftPath,clusteranodePath,clusterJ->Samples()/2
1344                                     ,tstart,tstop,0,0,0,astart,astop);
1345         clust->PrintInfo();
1346         iTS->AddCluster(1,clust);
1347         //      cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="<<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]<<","<<ncl<<endl;
1348         delete clust;
1349      }// nfhits loop
1350      fClusters->RemoveAt(j);
1351
1352    } // if nfhits = 2
1353   } // cluster loop
1354
1355   fClusters->Compress();
1356   fMap->ClearMap();
1357 */
1358   return;
1359 }
1360
1361
1362 //_____________________________________________________________________________
1363
1364 void AliITSClusterFinderSDD::GetRecPoints()
1365 {
1366   // get rec points
1367
1368   AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1369
1370   // get number of clusters for this module
1371   Int_t nofClusters = fClusters->GetEntriesFast();
1372   nofClusters -= fNclusters;
1373
1374   const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1375   const Float_t kconv = 1.0e-4;
1376   const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1377   const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1378
1379
1380   Int_t i;
1381   Int_t ix, iz, idx=-1;
1382   AliITSdigitSDD *dig=0;
1383   Int_t ndigits=fDigits->GetEntriesFast();
1384   for(i=0; i<nofClusters; i++) {
1385     AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1386     if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1387     if(clusterI) idx=clusterI->PeakPos();
1388     if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1389     // try peak neighbours - to be done
1390     if(idx && idx <= ndigits) dig = (AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1391     if(!dig) {
1392         // try cog
1393         fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1394         dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1395         // if null try neighbours
1396         if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1397         if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1398         if (!dig) printf("SDD: cannot assign the track number!\n");
1399     }
1400
1401     AliITSRecPoint rnew;
1402     rnew.SetX(clusterI->X());
1403     rnew.SetZ(clusterI->Z());
1404     rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1405     rnew.SetdEdX(kconvGeV*clusterI->Q());
1406     rnew.SetSigmaX2(kRMSx*kRMSx);
1407     rnew.SetSigmaZ2(kRMSz*kRMSz);
1408     if(dig) rnew.fTracks[0]=dig->fTracks[0];
1409     if(dig) rnew.fTracks[1]=dig->fTracks[1];
1410     if(dig) rnew.fTracks[2]=dig->fTracks[2];
1411     //printf("SDD: i %d track1 track2 track3 %d %d %d x y %f %f\n",i,rnew.fTracks[0],rnew.fTracks[1],rnew.fTracks[2],clusterI->X(),clusterI->Z());
1412     iTS->AddRecPoint(rnew);
1413   } // I clusters
1414
1415   fMap->ClearMap();
1416 }
1417
1418 //_____________________________________________________________________________
1419
1420 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod)
1421 {
1422   // find raw clusters
1423     Find1DClustersE();
1424     GroupClusters();
1425     SelectClusters();
1426     ResolveClustersE();
1427     GetRecPoints();
1428 }
1429 //_____________________________________________________________________________
1430
1431 void AliITSClusterFinderSDD::Print()
1432 {
1433   // Print SDD cluster finder Parameters
1434
1435    cout << "**************************************************" << endl;
1436    cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1437    cout << "**************************************************" << endl;
1438    cout << "Number of Clusters: " << fNclusters << endl;
1439    cout << "Anode Tolerance: " << fDAnode << endl;
1440    cout << "Time  Tolerance: " << fDTime << endl;
1441    cout << "Time  correction (electronics): " << fTimeCorr << endl;
1442    cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1443    cout << "Minimum Amplitude: " << fMinPeak << endl;
1444    cout << "Minimum Charge: " << fMinCharge << endl;
1445    cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1446    cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1447    cout << "**************************************************" << endl;
1448 }