ITS/AliITSClusterFinderSDD.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   *
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  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.                  *
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  15 /*
  16   $Id$
  17   $Log$
  18   Revision 1.29  2002/10/25 18:54:22  barbera
  19   Various improvements and updates from B.S.Nilsen and T. Virgili
  20
  21   Revision 1.28  2002/10/22 14:45:29  alibrary
  22   Introducing Riostream.h
  23
  24   Revision 1.27  2002/10/14 14:57:00  hristov
  25   Merging the VirtualMC branch to the main development branch (HEAD)
  26
  27   Revision 1.23.4.2  2002/10/14 13:14:07  hristov
  28   Updating VirtualMC to v3-09-02
  29
  30   Revision 1.26  2002/09/09 17:23:28  nilsen
  31   Minor changes in support of changes to AliITSdigitS?D class'.
  32
  33   Revision 1.25  2002/05/10 22:29:40  nilsen
  34   Change my Massimo Masera in the default constructor to bring things into
  35   compliance.
  36
  37   Revision 1.24  2002/04/24 22:02:31  nilsen
  38   New SDigits and Digits routines, and related changes,  (including new
  39   noise values).
  40
  41  */
  42 //
  43 //  Cluster finder
  44 //  for Silicon
  45 //  Drift Detector
  46 //
  47 #include <Riostream.h>
  48
  49 #include <TMath.h>
  50 #include <math.h>
  51
  52 #include "AliITSClusterFinderSDD.h"
  53 #include "AliITSMapA1.h"
  54 #include "AliITS.h"
  55 #include "AliITSdigit.h"
  56 #include "AliITSRawCluster.h"
  57 #include "AliITSRecPoint.h"
  58 #include "AliITSsegmentation.h"
  59 #include "AliITSresponseSDD.h"
  60 #include "AliRun.h"
  61
  62 ClassImp(AliITSClusterFinderSDD)
  63
  64 //______________________________________________________________________
  65 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSsegmentation *seg,
  66                                                AliITSresponse *response,
  67                                                TClonesArray *digits,
  68                                                TClonesArray *recp){
  69     // standard constructor
  70
  71     fSegmentation = seg;
  72     fResponse     = response;
  73     fDigits       = digits;
  74     fClusters     = recp;
  75     fNclusters    = fClusters->GetEntriesFast();
  76     SetCutAmplitude();
  77     SetDAnode();
  78     SetDTime();
  79     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
  80     //    SetMinPeak();
  81     SetMinNCells();
  82     SetMaxNCells();
  83     SetTimeCorr();
  84     SetMinCharge();
  85     fMap = new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
  86 }
  87 //______________________________________________________________________
  88 AliITSClusterFinderSDD::AliITSClusterFinderSDD(){
  89     // default constructor
  90
  91     fSegmentation = 0;
  92     fResponse     = 0;
  93     fDigits       = 0;
  94     fClusters     = 0;
  95     fNclusters    = 0;
  96     fMap          = 0;
  97     fCutAmplitude = 0;
  98     fDAnode = 0;
  99     fDTime = 0;
 100     fMinPeak = 0;
 101     fMinNCells = 0;
 102     fMaxNCells = 0;
 103     fTimeCorr = 0;
 104     fMinCharge = 0;
 105     /*
 106     SetDAnode();
 107     SetDTime();
 108     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
 109     SetMinNCells();
 110     SetMaxNCells();
 111     SetTimeCorr();
 112     SetMinCharge();
 113     */
 114 }
 115 //____________________________________________________________________________
 116 AliITSClusterFinderSDD::~AliITSClusterFinderSDD(){
 117     // destructor
 118
 119     if(fMap) delete fMap;
 120 }
 121 //______________________________________________________________________
 122 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma){
 123     // set the signal threshold for cluster finder
 124     Float_t baseline,noise,noiseAfterEl;
 125
 126     fResponse->GetNoiseParam(noise,baseline);
 127     noiseAfterEl = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
 128     fCutAmplitude = (Int_t)((baseline + nsigma*noiseAfterEl));
 129 }
 130 //______________________________________________________________________
 131 void AliITSClusterFinderSDD::Find1DClusters(){
 132     // find 1D clusters
 133     static AliITS *iTS = (AliITS*)gAlice->GetModule("ITS");
 134
 135     // retrieve the parameters
 136     Int_t fNofMaps       = fSegmentation->Npz();
 137     Int_t fMaxNofSamples = fSegmentation->Npx();
 138     Int_t fNofAnodes     = fNofMaps/2;
 139     Int_t dummy          = 0;
 140     Float_t fTimeStep    = fSegmentation->Dpx(dummy);
 141     Float_t fSddLength   = fSegmentation->Dx();
 142     Float_t fDriftSpeed  = fResponse->DriftSpeed();
 143     Float_t anodePitch   = fSegmentation->Dpz(dummy);
 144
 145     // map the signal
 146     fMap->ClearMap();
 147     fMap->SetThreshold(fCutAmplitude);
 148     fMap->FillMap();
 149
 150     Float_t noise;
 151     Float_t baseline;
 152     fResponse->GetNoiseParam(noise,baseline);
 153
 154     Int_t nofFoundClusters = 0;
 155     Int_t i;
 156     Float_t **dfadc = new Float_t*[fNofAnodes];
 157     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 158     Float_t fadc  = 0.;
 159     Float_t fadc1 = 0.;
 160     Float_t fadc2 = 0.;
 161     Int_t j,k,idx,l,m;
 162     for(j=0;j<2;j++) {
 163         for(k=0;k<fNofAnodes;k++) {
 164             idx = j*fNofAnodes+k;
 165             // signal (fadc) & derivative (dfadc)
 166             dfadc[k][255]=0.;
 167             for(l=0; l<fMaxNofSamples; l++) {
 168                 fadc2=(Float_t)fMap->GetSignal(idx,l);
 169                 if(l>0) fadc1=(Float_t)fMap->GetSignal(idx,l-1);
 170                 if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 171             } // samples
 172         } // anodes
 173
 174         for(k=0;k<fNofAnodes;k++) {
 175         //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 176             idx = j*fNofAnodes+k;
 177             Int_t imax  = 0;
 178             Int_t imaxd = 0;
 179             Int_t it    = 0;
 180             while(it <= fMaxNofSamples-3) {
 181                 imax  = it;
 182                 imaxd = it;
 183                 // maximum of signal
 184                 Float_t fadcmax  = 0.;
 185                 Float_t dfadcmax = 0.;
 186                 Int_t lthrmina   = 1;
 187                 Int_t lthrmint   = 3;
 188                 Int_t lthra      = 1;
 189                 Int_t lthrt      = 0;
 190                 for(m=0;m<20;m++) {
 191                     Int_t id = it+m;
 192                     if(id>=fMaxNofSamples) break;
 193                     fadc=(float)fMap->GetSignal(idx,id);
 194                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 195                     if(fadc > (float)fCutAmplitude) {
 196                         lthrt++;
 197                     } // end if
 198                     if(dfadc[k][id] > dfadcmax) {
 199                         dfadcmax = dfadc[k][id];
 200                         imaxd    = id;
 201                     } // end if
 202                 } // end for m
 203                 it = imaxd;
 204                 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 205                 // cluster charge
 206                 Int_t tstart = it-2;
 207                 if(tstart < 0) tstart = 0;
 208                 Bool_t ilcl = 0;
 209                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 210                 if(ilcl) {
 211                     nofFoundClusters++;
 212                     Int_t tstop      = tstart;
 213                     Float_t dfadcmin = 10000.;
 214                     Int_t ij;
 215                     for(ij=0; ij<20; ij++) {
 216                         if(tstart+ij > 255) { tstop = 255; break; }
 217                         fadc=(float)fMap->GetSignal(idx,tstart+ij);
 218                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 219                            (fadc > fCutAmplitude)) {
 220                             tstop = tstart+ij+5;
 221                             if(tstop > 255) tstop = 255;
 222                             dfadcmin = dfadc[k][it+ij];
 223                         } // end if
 224                     } // end for ij
 225
 226                     Float_t clusterCharge = 0.;
 227                     Float_t clusterAnode  = k+0.5;
 228                     Float_t clusterTime   = 0.;
 229                     Int_t   clusterMult   = 0;
 230                     Float_t clusterPeakAmplitude = 0.;
 231                     Int_t its,peakpos     = -1;
 232                     Float_t n, baseline;
 233                     fResponse->GetNoiseParam(n,baseline);
 234                     for(its=tstart; its<=tstop; its++) {
 235                         fadc=(float)fMap->GetSignal(idx,its);
 236                         if(fadc>baseline) fadc -= baseline;
 237                         else fadc = 0.;
 238                         clusterCharge += fadc;
 239                         // as a matter of fact we should take the peak
 240                         // pos before FFT
 241                         // to get the list of tracks !!!
 242                         if(fadc > clusterPeakAmplitude) {
 243                             clusterPeakAmplitude = fadc;
 244                             //peakpos=fMap->GetHitIndex(idx,its);
 245                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 246                             if(its>shift && its<(fMaxNofSamples-shift))
 247                                 peakpos  = fMap->GetHitIndex(idx,its+shift);
 248                             else peakpos = fMap->GetHitIndex(idx,its);
 249                             if(peakpos<0) peakpos =fMap->GetHitIndex(idx,its);
 250                         } // end if
 251                         clusterTime += fadc*its;
 252                         if(fadc > 0) clusterMult++;
 253                         if(its == tstop) {
 254                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 255                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 256                             //ns
 257                         } // end if
 258                     } // end for its
 259
 260                     Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 261                                                anodePitch;
 262                     Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 263                     clusterDriftPath = fSddLength-clusterDriftPath;
 264                     if(clusterCharge <= 0.) break;
 265                     AliITSRawClusterSDD clust(j+1,//i
 266                                               clusterAnode,clusterTime,//ff
 267                                               clusterCharge, //f
 268                                               clusterPeakAmplitude, //f
 269                                               peakpos, //i
 270                                               0.,0.,clusterDriftPath,//fff
 271                                               clusteranodePath, //f
 272                                               clusterMult, //i
 273                                               0,0,0,0,0,0,0);//7*i
 274                     iTS->AddCluster(1,&clust);
 275                     it = tstop;
 276                 } // ilcl
 277                 it++;
 278             } // while (samples)
 279         } // anodes
 280     } // detectors (2)
 281
 282     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 283     delete [] dfadc;
 284
 285     return;
 286 }
 287
 288
 289
 290 //______________________________________________________________________
 291 void AliITSClusterFinderSDD::Find1DClustersE(){
 292     // find 1D clusters
 293     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 294     // retrieve the parameters
 295     Int_t fNofMaps = fSegmentation->Npz();
 296     Int_t fMaxNofSamples = fSegmentation->Npx();
 297     Int_t fNofAnodes = fNofMaps/2;
 298     Int_t dummy=0;
 299     Float_t fTimeStep = fSegmentation->Dpx( dummy );
 300     Float_t fSddLength = fSegmentation->Dx();
 301     Float_t fDriftSpeed = fResponse->DriftSpeed();
 302     Float_t anodePitch = fSegmentation->Dpz( dummy );
 303     Float_t n, baseline;
 304     fResponse->GetNoiseParam( n, baseline );
 305     // map the signal
 306     fMap->ClearMap();
 307     fMap->SetThreshold( fCutAmplitude );
 308     fMap->FillMap();
 309
 310     Int_t nClu = 0;
 311     //        cout << "Search  cluster... "<< endl;
 312     for( Int_t j=0; j<2; j++ ){
 313         for( Int_t k=0; k<fNofAnodes; k++ ){
 314             Int_t idx = j*fNofAnodes+k;
 315             Bool_t on = kFALSE;
 316             Int_t start = 0;
 317             Int_t nTsteps = 0;
 318             Float_t fmax = 0.;
 319             Int_t lmax = 0;
 320             Float_t charge = 0.;
 321             Float_t time = 0.;
 322             Float_t anode = k+0.5;
 323             Int_t peakpos = -1;
 324             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 325                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 326                 if( fadc > 0.0 ){
 327                     if( on == kFALSE && l<fMaxNofSamples-4){
 328                         // star RawCluster (reset var.)
 329                         Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 330                         if( fadc1 < fadc ) continue;
 331                         start = l;
 332                         fmax = 0.;
 333                         lmax = 0;
 334                         time = 0.;
 335                         charge = 0.;
 336                         on = kTRUE;
 337                         nTsteps = 0;
 338                     } // end if on...
 339                     nTsteps++ ;
 340                     if( fadc > baseline ) fadc -= baseline;
 341                     else fadc=0.;
 342                     charge += fadc;
 343                     time += fadc*l;
 344                     if( fadc > fmax ){
 345                         fmax = fadc;
 346                         lmax = l;
 347                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 348                         if( l > shift && l < (fMaxNofSamples-shift) )
 349                             peakpos = fMap->GetHitIndex( idx, l+shift );
 350                         else
 351                             peakpos = fMap->GetHitIndex( idx, l );
 352                         if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
 353                     } // end if fadc
 354                 }else{ // end fadc>0
 355                     if( on == kTRUE ){
 356                         if( nTsteps > 2 ){
 357                             //  min # of timesteps for a RawCluster
 358                             // Found a RawCluster...
 359                             Int_t stop = l-1;
 360                             time /= (charge/fTimeStep);   // ns
 361                                 // time = lmax*fTimeStep;   // ns
 362                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 363                             Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 364                             Float_t driftPath = time*fDriftSpeed;
 365                             driftPath = fSddLength-driftPath;
 366                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 367                                                       fmax, peakpos,0.,0.,
 368                                                       driftPath,anodePath,
 369                                                       nTsteps,start,stop,
 370                                                       start, stop, 1, k, k );
 371                             iTS->AddCluster( 1, &clust );
 372                             //        clust.PrintInfo();
 373                             nClu++;
 374                         } // end if nTsteps
 375                         on = kFALSE;
 376                     } // end if on==kTRUE
 377                 } // end if fadc>0
 378             } // samples
 379         } // anodes
 380     } // wings
 381     //        cout << "# Rawclusters " << nClu << endl;
 382     return;
 383 }
 384 //_______________________________________________________________________
 385 Int_t AliITSClusterFinderSDD::SearchPeak(Float_t *spect,Int_t xdim,Int_t zdim,
 386                                          Int_t *peakX, Int_t *peakZ,
 387                                          Float_t *peakAmp, Float_t minpeak ){
 388     // search peaks on a 2D cluster
 389     Int_t npeak = 0;    // # peaks
 390     Int_t i,j;
 391     // search peaks
 392     for( Int_t z=1; z<zdim-1; z++ ){
 393         for( Int_t x=1; x<xdim-2; x++ ){
 394             Float_t sxz = spect[x*zdim+z];
 395             Float_t sxz1 = spect[(x+1)*zdim+z];
 396             Float_t sxz2 = spect[(x-1)*zdim+z];
 397             // search a local max. in s[x,z]
 398             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 399             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 400                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 401                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 402                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 403                 // peak found
 404                 peakX[npeak] = x;
 405                 peakZ[npeak] = z;
 406                 peakAmp[npeak] = sxz;
 407                 npeak++;
 408             } // end if ....
 409         } // end for x
 410     } // end for z
 411     // search groups of peaks with same amplitude.
 412     Int_t *flag = new Int_t[npeak];
 413     for( i=0; i<npeak; i++ ) flag[i] = 0;
 414     for( i=0; i<npeak; i++ ){
 415         for( j=0; j<npeak; j++ ){
 416             if( i==j) continue;
 417             if( flag[j] > 0 ) continue;
 418             if( peakAmp[i] == peakAmp[j] &&
 419                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 420                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 421                 if( flag[i] == 0) flag[i] = i+1;
 422                 flag[j] = flag[i];
 423             } // end if ...
 424         } // end for j
 425     } // end for i
 426     // make average of peak groups
 427     for( i=0; i<npeak; i++ ){
 428         Int_t nFlag = 1;
 429         if( flag[i] <= 0 ) continue;
 430         for( j=0; j<npeak; j++ ){
 431             if( i==j ) continue;
 432             if( flag[j] != flag[i] ) continue;
 433             peakX[i] += peakX[j];
 434             peakZ[i] += peakZ[j];
 435             nFlag++;
 436             npeak--;
 437             for( Int_t k=j; k<npeak; k++ ){
 438                 peakX[k] = peakX[k+1];
 439                 peakZ[k] = peakZ[k+1];
 440                 peakAmp[k] = peakAmp[k+1];
 441                 flag[k] = flag[k+1];
 442             } // end for k
 443             j--;
 444         } // end for j
 445         if( nFlag > 1 ){
 446             peakX[i] /= nFlag;
 447             peakZ[i] /= nFlag;
 448         } // end fi nFlag
 449     } // end for i
 450     delete [] flag;
 451     return( npeak );
 452 }
 453 //______________________________________________________________________
 454 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par,
 455                                        Float_t *spe, Float_t *integral){
 456     // function used to fit the clusters
 457     // par -> parameters..
 458     // par[0]  number of peaks.
 459     // for each peak i=1, ..., par[0]
 460     //                 par[i] = Ampl.
 461     //                 par[i+1] = xpos
 462     //                 par[i+2] = zpos
 463     //                 par[i+3] = tau
 464     //                 par[i+4] = sigma.
 465     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 466     const Int_t knParam = 5;
 467     Int_t npeak = (Int_t)par[0];
 468
 469     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 470
 471     Int_t k = 1;
 472     for( Int_t i=0; i<npeak; i++ ){
 473         if( integral != 0 ) integral[i] = 0.;
 474         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 475         Float_t t2 = par[k+3];   // PASCAL
 476         if( electronics == 2 ) { t2 *= t2; t2 *= 2; } // OLA
 477         for( Int_t z=0; z<zdim; z++ ){
 478             for( Int_t x=0; x<xdim; x++ ){
 479                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 480                 Float_t x2 = 0.;
 481                 Float_t signal = 0.;
 482                 if( electronics == 1 ){ // PASCAL
 483                     x2 = (x-par[k+1]+t2)/t2;
 484                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 485                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 486                 }else if( electronics == 2 ) { // OLA
 487                     x2 = (x-par[k+1])*(x-par[k+1])/t2;
 488                     signal = par[k]  * exp( -x2 - z2 );
 489                 } else {
 490                   Warning("PeakFunc","Wrong SDD Electronics = %d",electronics);
 491                     // exit( 1 );
 492                 } // end if electronicx
 493                 spe[x*zdim+z] += signal;
 494                 if( integral != 0 ) integral[i] += signal;
 495             } // end for x
 496         } // end for z
 497         k += knParam;
 498     } // end for i
 499     return;
 500 }
 501 //__________________________________________________________________________
 502 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
 503                                         Float_t *speFit ) const{
 504     // EVALUATES UNNORMALIZED CHI-SQUARED
 505     Float_t chi2 = 0.;
 506     for( Int_t z=0; z<zdim; z++ ){
 507         for( Int_t x=1; x<xdim-1; x++ ){
 508             Int_t index = x*zdim+z;
 509             Float_t tmp = spe[index] - speFit[index];
 510             chi2 += tmp*tmp;
 511         } // end for x
 512     } // end for z
 513     return( chi2 );
 514 }
 515 //_______________________________________________________________________
 516 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param,
 517                                     Float_t *prm0,Float_t *steprm,
 518                                     Float_t *chisqr,Float_t *spe,
 519                                     Float_t *speFit ){
 520     //
 521     Int_t   k, nnn, mmm, i;
 522     Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 523     const Int_t knParam = 5;
 524     Int_t npeak = (Int_t)param[0];
 525     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 526     for( k=1; k<(npeak*knParam+1); k++ ){
 527         p1 = param[k];
 528         delta = steprm[k];
 529         d1 = delta;
 530         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 531         if( fabs( p1 ) > 1.0E-6 )
 532             if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 533             else  delta = (Float_t)1.0E-4;
 534         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 535         PeakFunc( xdim, zdim, param, speFit );
 536         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 537         p2 = p1+delta;
 538         param[k] = p2;
 539         PeakFunc( xdim, zdim, param, speFit );
 540         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 541         if( chisq1 < chisq2 ){
 542             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 543             delta = -delta;
 544             t = p1;
 545             p1 = p2;
 546             p2 = t;
 547             t = chisq1;
 548             chisq1 = chisq2;
 549             chisq2 = t;
 550         } // end if
 551         i = 1; nnn = 0;
 552         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 553             nnn++;
 554             p3 = p2 + delta;
 555             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 556             if( mmm == 0 ){
 557                 d1 = delta;
 558                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 559                 delta *= 5;
 560             } // end if
 561             param[k] = p3;
 562             // Constrain paramiters
 563             Int_t kpos = (k-1) % knParam;
 564             switch( kpos ){
 565             case 0 :
 566                 if( param[k] <= 20 ) param[k] = fMinPeak;
 567                 break;
 568             case 1 :
 569                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 570                 break;
 571             case 2 :
 572                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 573                 break;
 574             case 3 :
 575                 if( param[k] < .5 ) param[k] = .5;
 576                 break;
 577             case 4 :
 578                 if( param[k] < .288 ) param[k] = .288;        // 1/sqrt(12) = 0.288
 579                 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 580                 break;
 581             }; // end switch
 582             PeakFunc( xdim, zdim, param, speFit );
 583             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 584             if( chisq3 < chisq2 && nnn < 50 ){
 585                 p1 = p2;
 586                 p2 = p3;
 587                 chisq1 = chisq2;
 588                 chisq2 = chisq3;
 589             }else i=0;
 590         } while( i );
 591         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 592         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 593         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 594         if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 595         else p0 = 10000;
 596         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 597         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 598         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 599         //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 600         //if( fabs( p2-p0 ) > dp ) p0 = p2;
 601         param[k] = p0;
 602         // Constrain paramiters
 603         Int_t kpos = (k-1) % knParam;
 604         switch( kpos ){
 605         case 0 :
 606             if( param[k] <= 20 ) param[k] = fMinPeak;
 607             break;
 608         case 1 :
 609             if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 610             break;
 611         case 2 :
 612             if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 613             break;
 614         case 3 :
 615             if( param[k] < .5 ) param[k] = .5;
 616             break;
 617         case 4 :
 618             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 619             if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 620             break;
 621         }; // end switch
 622         PeakFunc( xdim, zdim, param, speFit );
 623         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 624         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 625         if( chisqt <= *chisqr ) *chisqr = chisqt;
 626         else param[k] = prm0[k];
 627         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 628         steprm[k] = (param[k]-prm0[k])/5;
 629         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 630     } // end for k
 631     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 632     PeakFunc( xdim, zdim, param, speFit );
 633     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 634     return;
 635 }
 636 //_________________________________________________________________________
 637 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 638                                            Float_t *param, Float_t *spe,
 639                                            Int_t *niter, Float_t *chir ){
 640     // fit method from Comput. Phys. Commun 46(1987) 149
 641     const Float_t kchilmt = 0.01;  //        relative accuracy
 642     const Int_t   knel = 3;        //        for parabolic minimization
 643     const Int_t   knstop = 50;     //        Max. iteration number
 644     const Int_t   knParam = 5;
 645     Int_t npeak = (Int_t)param[0];
 646     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 647     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 648     Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 649     Int_t   n, k, iterNum = 0;
 650     Float_t *prm0 = new Float_t[npeak*knParam+1];
 651     Float_t *step = new Float_t[npeak*knParam+1];
 652     Float_t *schi = new Float_t[npeak*knParam+1];
 653     Float_t *sprm[3];
 654     sprm[0] = new Float_t[npeak*knParam+1];
 655     sprm[1] = new Float_t[npeak*knParam+1];
 656     sprm[2] = new Float_t[npeak*knParam+1];
 657     Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 658     Float_t *speFit = new Float_t[ xdim*zdim ];
 659     PeakFunc( xdim, zdim, param, speFit );
 660     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 661     chi1 = chi0;
 662     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 663         for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 664             step[k] = param[k] / 20.0 ;
 665             step[k+1] = param[k+1] / 50.0;
 666             step[k+2] = param[k+2] / 50.0;
 667             step[k+3] = param[k+3] / 20.0;
 668             step[k+4] = param[k+4] / 20.0;
 669         } // end for k
 670     Int_t out = 0;
 671     do{
 672         iterNum++;
 673             chi0 = chi1;
 674             Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 675             reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 676         // EXIT conditions
 677         if( reldif < (float) kchilmt ){
 678             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 679             *niter = iterNum;
 680             out = 0;
 681             break;
 682         } // end if
 683         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 684             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 685             *niter = iterNum;
 686             out = 0;
 687             break;
 688         } // end if
 689         if( iterNum > 5*knstop ){
 690             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 691             *niter = iterNum;
 692             out = 1;
 693             break;
 694         } // end if
 695         if( iterNum <= knel ) continue;
 696         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 697         if( n > 3 || n == 0 ) continue;
 698         schi[n-1] = chi1;
 699         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 700         if( n != 3 ) continue;
 701         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 702         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 703         for( k=1; k<(npeak*knParam+1); k++ ){
 704             Float_t tmp0 = sprm[0][k];
 705             Float_t tmp1 = sprm[1][k];
 706             Float_t tmp2 = sprm[2][k];
 707             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 708             a += (schi[2]*(tmp0-tmp1));
 709             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 710             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 711                                              (tmp0*tmp0-tmp1*tmp1)));
 712             if ((double)a < 1.0E-6) prmin = 0;
 713             else prmin = (float) (0.5*b/a);
 714             dp = 5*(tmp2-tmp0);
 715             if( fabs(prmin-tmp2) > fabs(dp) ) prmin = tmp2+dp;
 716             param[k] = prmin;
 717             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 718         } // end for k
 719     } while( kTRUE );
 720     delete [] prm0;
 721     delete [] step;
 722     delete [] schi;
 723     delete [] sprm[0];
 724     delete [] sprm[1];
 725     delete [] sprm[2];
 726     delete [] speFit;
 727     return( out );
 728 }
 729
 730 //______________________________________________________________________
 731 void AliITSClusterFinderSDD::ResolveClustersE(){
 732     // The function to resolve clusters if the clusters overlapping exists
 733     Int_t i;
 734     static AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 735     // get number of clusters for this module
 736     Int_t nofClusters = fClusters->GetEntriesFast();
 737     nofClusters -= fNclusters;
 738     Int_t fNofMaps = fSegmentation->Npz();
 739     Int_t fNofAnodes = fNofMaps/2;
 740     Int_t fMaxNofSamples = fSegmentation->Npx();
 741     Int_t dummy=0;
 742     Double_t fTimeStep = fSegmentation->Dpx( dummy );
 743     Double_t fSddLength = fSegmentation->Dx();
 744     Double_t fDriftSpeed = fResponse->DriftSpeed();
 745     Double_t anodePitch = fSegmentation->Dpz( dummy );
 746     Float_t n, baseline;
 747     fResponse->GetNoiseParam( n, baseline );
 748     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 749
 750     for( Int_t j=0; j<nofClusters; j++ ){
 751         // get cluster information
 752         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 753         Int_t astart = clusterJ->Astart();
 754         Int_t astop = clusterJ->Astop();
 755         Int_t tstart = clusterJ->Tstartf();
 756         Int_t tstop = clusterJ->Tstopf();
 757         Int_t wing = (Int_t)clusterJ->W();
 758         if( wing == 2 ){
 759             astart += fNofAnodes;
 760             astop  += fNofAnodes;
 761         } // end if
 762         Int_t xdim = tstop-tstart+3;
 763         Int_t zdim = astop-astart+3;
 764         if(xdim > 50 || zdim > 30) {
 765           Warning("ResolveClustersE","xdim: %d , zdim: %d ",xdim,zdim);
 766           continue;
 767         }
 768         Float_t *sp = new Float_t[ xdim*zdim+1 ];
 769         memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 770
 771         // make a local map from cluster region
 772         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 773             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 774                 Float_t fadc = fMap->GetSignal( ianode, itime );
 775                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 776                 else fadc = 0.;
 777                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 778                 sp[index] = fadc;
 779             } // time loop
 780         } // anode loop
 781
 782         // search peaks on cluster
 783         const Int_t kNp = 150;
 784         Int_t peakX1[kNp];
 785         Int_t peakZ1[kNp];
 786         Float_t peakAmp1[kNp];
 787         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 788
 789         // if multiple peaks, split cluster
 790         if( npeak >= 1 )
 791         {
 792             //        cout << "npeak " << npeak << endl;
 793             //        clusterJ->PrintInfo();
 794             Float_t *par = new Float_t[npeak*5+1];
 795             par[0] = (Float_t)npeak;
 796             // Initial parameters in cell dimentions
 797             Int_t k1 = 1;
 798             for( i=0; i<npeak; i++ ){
 799                 par[k1] = peakAmp1[i];
 800                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 801                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 802                 if( electronics == 1 )
 803                     par[k1+3] = 2.; // PASCAL
 804                 else if( electronics == 2 )
 805                     par[k1+3] = 0.7; // tau [timebin]  OLA
 806                 par[k1+4] = .4;    // sigma        [anodepich]
 807                 k1+=5;
 808             } // end for i
 809             Int_t niter;
 810             Float_t chir;
 811             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 812             Float_t peakX[kNp];
 813             Float_t peakZ[kNp];
 814             Float_t sigma[kNp];
 815             Float_t tau[kNp];
 816             Float_t peakAmp[kNp];
 817             Float_t integral[kNp];
 818             //get integrals => charge for each peak
 819             PeakFunc( xdim, zdim, par, sp, integral );
 820             k1 = 1;
 821             for( i=0; i<npeak; i++ ){
 822                 peakAmp[i] = par[k1];
 823                 peakX[i] = par[k1+1];
 824                 peakZ[i] = par[k1+2];
 825                 tau[i] = par[k1+3];
 826                 sigma[i] = par[k1+4];
 827                 k1+=5;
 828             } // end for i
 829             // calculate parameter for new clusters
 830             for( i=0; i<npeak; i++ ){
 831                 AliITSRawClusterSDD clusterI( *clusterJ );
 832                 Int_t newAnode = peakZ1[i]-1 + astart;
 833                 Int_t newiTime = peakX1[i]-1 + tstart;
 834                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 835                 if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )
 836                     shift = 0;
 837                 Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 838                 clusterI.SetPeakPos( peakpos );
 839                 clusterI.SetPeakAmpl( peakAmp1[i] );
 840                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 841                 Float_t newiTimef = peakX[i] - 1 + tstart;
 842                 if( wing == 2 ) newAnodef -= fNofAnodes;
 843                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 844                 newiTimef *= fTimeStep;
 845                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 846                 if( electronics == 1 ){
 847                 //    newiTimef *= 0.999438;    // PASCAL
 848                 //    newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 849                 }else if( electronics == 2 )
 850                     newiTimef *= 0.99714;    // OLA
 851                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 852                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 853                 clusterI.SetX( driftPath*sign * 0.0001 );
 854                 clusterI.SetZ( anodePath * 0.0001 );
 855                 clusterI.SetAnode( newAnodef );
 856                 clusterI.SetTime( newiTimef );
 857                 clusterI.SetAsigma( sigma[i]*anodePitch );
 858                 clusterI.SetTsigma( tau[i]*fTimeStep );
 859                 clusterI.SetQ( integral[i] );
 860                 //    clusterI.PrintInfo();
 861                 iTS->AddCluster( 1, &clusterI );
 862             } // end for i
 863             fClusters->RemoveAt( j );
 864             delete [] par;
 865         } else {  // something odd
 866           Warning("ResolveClustersE","--- Peak not found!!!!  minpeak=%d ,cluster peak= %f , module= %d",fMinPeak,clusterJ->PeakAmpl(),fModule);
 867           clusterJ->PrintInfo();
 868           Warning("ResolveClustersE"," xdim= %d zdim= %d",xdim-2,zdim-2);
 869         }
 870         delete [] sp;
 871     } // cluster loop
 872     fClusters->Compress();
 873 //    fMap->ClearMap();
 874 }
 875
 876
 877 //________________________________________________________________________
 878 void  AliITSClusterFinderSDD::GroupClusters(){
 879     // group clusters
 880     Int_t dummy=0;
 881     Float_t fTimeStep = fSegmentation->Dpx(dummy);
 882     // get number of clusters for this module
 883     Int_t nofClusters = fClusters->GetEntriesFast();
 884     nofClusters -= fNclusters;
 885     AliITSRawClusterSDD *clusterI;
 886     AliITSRawClusterSDD *clusterJ;
 887     Int_t *label = new Int_t [nofClusters];
 888     Int_t i,j;
 889     for(i=0; i<nofClusters; i++) label[i] = 0;
 890     for(i=0; i<nofClusters; i++) {
 891         if(label[i] != 0) continue;
 892         for(j=i+1; j<nofClusters; j++) {
 893             if(label[j] != 0) continue;
 894             clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 895             clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 896             // 1.3 good
 897             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 898             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 899             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 900             if(!pair) continue;
 901             //      clusterI->PrintInfo();
 902             //      clusterJ->PrintInfo();
 903             clusterI->Add(clusterJ);
 904             label[j] = 1;
 905             fClusters->RemoveAt(j);
 906             j=i; // <- Ernesto
 907         } // J clusters
 908         label[i] = 1;
 909     } // I clusters
 910     fClusters->Compress();
 911
 912     delete [] label;
 913     return;
 914 }
 915 //________________________________________________________________________
 916 void AliITSClusterFinderSDD::SelectClusters(){
 917     // get number of clusters for this module
 918     Int_t nofClusters = fClusters->GetEntriesFast();
 919
 920     nofClusters -= fNclusters;
 921     Int_t i;
 922     for(i=0; i<nofClusters; i++) {
 923         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
 924         Int_t rmflg = 0;
 925         Float_t wy = 0.;
 926         if(clusterI->Anodes() != 0.) {
 927             wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
 928         } // end if
 929         Int_t amp = (Int_t) clusterI->PeakAmpl();
 930         Int_t cha = (Int_t) clusterI->Q();
 931         if(amp < fMinPeak) rmflg = 1;
 932         if(cha < fMinCharge) rmflg = 1;
 933         if(wy < fMinNCells) rmflg = 1;
 934         //if(wy > fMaxNCells) rmflg = 1;
 935         if(rmflg) fClusters->RemoveAt(i);
 936     } // I clusters
 937     fClusters->Compress();
 938     return;
 939 }
 940 //__________________________________________________________________________
 941 void AliITSClusterFinderSDD::ResolveClusters(){
 942     // The function to resolve clusters if the clusters overlapping exists
 943 /*    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 944     // get number of clusters for this module
 945     Int_t nofClusters = fClusters->GetEntriesFast();
 946     nofClusters -= fNclusters;
 947     //cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","
 948     // <<fNclusters<<endl;
 949     Int_t fNofMaps = fSegmentation->Npz();
 950     Int_t fNofAnodes = fNofMaps/2;
 951     Int_t dummy=0;
 952     Double_t fTimeStep = fSegmentation->Dpx(dummy);
 953     Double_t fSddLength = fSegmentation->Dx();
 954     Double_t fDriftSpeed = fResponse->DriftSpeed();
 955     Double_t anodePitch = fSegmentation->Dpz(dummy);
 956     Float_t n, baseline;
 957     fResponse->GetNoiseParam(n,baseline);
 958     Float_t dzz_1A = anodePitch * anodePitch / 12;
 959     // fill Map of signals
 960     fMap->FillMap();
 961     Int_t j,i,ii,ianode,anode,itime;
 962     Int_t wing,astart,astop,tstart,tstop,nanode;
 963     Double_t fadc,ClusterTime;
 964     Double_t q[400],x[400],z[400]; // digit charges and coordinates
 965     for(j=0; j<nofClusters; j++) {
 966         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 967         Int_t ndigits = 0;
 968         astart=clusterJ->Astart();
 969         astop=clusterJ->Astop();
 970         tstart=clusterJ->Tstartf();
 971         tstop=clusterJ->Tstopf();
 972         nanode=clusterJ->Anodes();  // <- Ernesto
 973         wing=(Int_t)clusterJ->W();
 974         if(wing == 2) {
 975             astart += fNofAnodes;
 976             astop  += fNofAnodes;
 977         }  // end if
 978         // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
 979         //      <<tstart<<","<<tstop<<endl;
 980         // clear the digit arrays
 981         for(ii=0; ii<400; ii++) {
 982             q[ii] = 0.;
 983             x[ii] = 0.;
 984             z[ii] = 0.;
 985         } // end for ii
 986
 987         for(ianode=astart; ianode<=astop; ianode++) {
 988             for(itime=tstart; itime<=tstop; itime++) {
 989                 fadc=fMap->GetSignal(ianode,itime);
 990                 if(fadc>baseline) {
 991                     fadc-=(Double_t)baseline;
 992                     q[ndigits] = fadc*(fTimeStep/160);  // KeV
 993                     anode = ianode;
 994                     if(wing == 2) anode -= fNofAnodes;
 995                     z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
 996                     ClusterTime = itime*fTimeStep;
 997                     if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;// ns
 998                     x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
 999                     if(wing == 1) x[ndigits] *= (-1);
1000                     // cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","
1001                     //     <<fadc<<endl;
1002                     // cout<<"wing,anode,ndigits,charge ="<<wing<<","
1003                     //      <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
1004                     ndigits++;
1005                     continue;
1006                 } //  end if
1007                 fadc=0;
1008                 //              cout<<"fadc=0, ndigits ="<<ndigits<<endl;
1009             } // time loop
1010         } // anode loop
1011         //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
1012         // Fit cluster to resolve for two separate ones --------------------
1013         Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
1014         Double_t dxx=0., dzz=0., dxz=0.;
1015         Double_t scl = 0., tmp, tga, elps = -1.;
1016         Double_t xfit[2], zfit[2], qfit[2];
1017         Double_t pitchz = anodePitch*1.e-4;             // cm
1018         Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
1019         Double_t sigma2;
1020         Int_t nfhits;
1021         Int_t nbins = ndigits;
1022         Int_t separate = 0;
1023         // now, all lengths are in microns
1024         for (ii=0; ii<nbins; ii++) {
1025             qq += q[ii];
1026             xm += x[ii]*q[ii];
1027             zm += z[ii]*q[ii];
1028             xx += x[ii]*x[ii]*q[ii];
1029             zz += z[ii]*z[ii]*q[ii];
1030             xz += x[ii]*z[ii]*q[ii];
1031         } // end for ii
1032         xm /= qq;
1033         zm /= qq;
1034         xx /= qq;
1035         zz /= qq;
1036         xz /= qq;
1037         dxx = xx - xm*xm;
1038         dzz = zz - zm*zm;
1039         dxz = xz - xm*zm;
1040
1041         // shrink the cluster in the time direction proportionaly to the
1042         // dxx/dzz, which lineary depends from the drift path
1043         // new  Ernesto........
1044         if( nanode == 1 ){
1045             dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
1046             scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
1047         } // end if
1048         if( nanode == 2 ){
1049             scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1050         } // end if
1051         if( nanode == 3 ){
1052             scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1053         } // end if
1054         if( nanode > 3 ){
1055             scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
1056         } // end if
1057         //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","
1058         //  <<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
1059         //  old Boris.........
1060         //  tmp=29730. - 585.*fabs(xm/1000.);
1061         //  scl=TMath::Sqrt(tmp/130000.);
1062
1063         xm *= scl;
1064         xx *= scl*scl;
1065         xz *= scl;
1066
1067         dxx = xx - xm*xm;
1068         //   dzz = zz - zm*zm;
1069         dxz = xz - xm*zm;
1070         //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1071         // <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1072         // if(dzz < 7200.) dzz=7200.;//for one anode cluster dzz = anode**2/12
1073
1074         if (dxx < 0.) dxx=0.;
1075         // the data if no cluster overlapping (the coordunates are in cm)
1076         nfhits = 1;
1077         xfit[0] = xm*1.e-4;
1078         zfit[0] = zm*1.e-4;
1079         qfit[0] = qq;
1080         //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1081
1082         if (nbins >= 7) {
1083             if (dxz==0.) tga=0.;
1084             else {
1085                 tmp=0.5*(dzz-dxx)/dxz;
1086                 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1087                                                    tmp+TMath::Sqrt(tmp*tmp+1);
1088             } // end if dxz
1089             elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1090             // change from microns to cm
1091             xm *= 1.e-4;
1092             zm *= 1.e-4;
1093             zz *= 1.e-8;
1094             xx *= 1.e-8;
1095             xz *= 1.e-8;
1096             dxz *= 1.e-8;
1097             dxx *= 1.e-8;
1098             dzz *= 1.e-8;
1099             //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1100             //  <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1101             for (i=0; i<nbins; i++) {
1102                 x[i] = x[i] *= scl;
1103                 x[i] = x[i] *= 1.e-4;
1104                 z[i] = z[i] *= 1.e-4;
1105             } // end for i
1106             //     cout<<"!!! elps ="<<elps<<endl;
1107             if (elps < 0.3) { // try to separate hits
1108                 separate = 1;
1109                 tmp=atan(tga);
1110                 Double_t cosa=cos(tmp),sina=sin(tmp);
1111                 Double_t a1=0., x1=0., xxx=0.;
1112                 for (i=0; i<nbins; i++) {
1113                     tmp=x[i]*cosa + z[i]*sina;
1114                     if (q[i] > a1) {
1115                         a1=q[i];
1116                         x1=tmp;
1117                     } // end if
1118                     xxx += tmp*tmp*tmp*q[i];
1119                 } // end for i
1120                 xxx /= qq;
1121                 Double_t z12=-sina*xm + cosa*zm;
1122                 sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1123                 xm=cosa*xm + sina*zm;
1124                 xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1125                 Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1126                 Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1127                 for (i=0; i<33; i++) { // solve a system of equations
1128                     Double_t x1_old=x1, x2_old=x2, r_old=r;
1129                     Double_t c11=x1-x2;
1130                     Double_t c12=r;
1131                     Double_t c13=1-r;
1132                     Double_t c21=x1*x1 - x2*x2;
1133                     Double_t c22=2*r*x1;
1134                     Double_t c23=2*(1-r)*x2;
1135                     Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1136                     Double_t c32=3*r*(sigma2 + x1*x1);
1137                     Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1138                     Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1139                     Double_t f2=-(r*(sigma2+x1*x1)+(1-r)*(sigma2+x2*x2)- xx);
1140                     Double_t f3=-(r*x1*(3*sigma2+x1*x1)+(1-r)*x2*
1141                                                          (3*sigma2+x2*x2)-xxx);
1142                     Double_t d=c11*c22*c33+c21*c32*c13+c12*c23*c31-
1143                                        c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1144                     if (d==0.) {
1145                         cout<<"*********** d=0 ***********\n";
1146                         break;
1147                     } // end if
1148                     Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1149                         f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1150                     Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1151                         c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1152                     Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1153                         c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1154                     r  += dr/d;
1155                     x1 += d1/d;
1156                     x2 += d2/d;
1157                     if (fabs(x1-x1_old) > 0.0001) continue;
1158                     if (fabs(x2-x2_old) > 0.0001) continue;
1159                     if (fabs(r-r_old)/5 > 0.001) continue;
1160                     a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1161                     Double_t a2=a1*(1-r)/r;
1162                     qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina +
1163                                                                 z12*cosa;
1164                     qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
1165                                                                 z12*cosa;
1166                     nfhits=2;
1167                     break; // Ok !
1168                 } // end for i
1169                 if (i==33) cerr<<"No more iterations ! "<<endl;
1170             } // end of attempt to separate overlapped clusters
1171         } // end of nbins cut
1172         if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1173         if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="
1174                                                      <<elps<<","<<nfhits<<endl;
1175         if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1176         for (i=0; i<nfhits; i++) {
1177             xfit[i] *= (1.e+4/scl);
1178             if(wing == 1) xfit[i] *= (-1);
1179             zfit[i] *= 1.e+4;
1180             //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","
1181             // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1182         } // end for i
1183         Int_t ncl = nfhits;
1184         if(nfhits == 1 && separate == 1) {
1185             cout<<"!!!!! no separate"<<endl;
1186             ncl = -2;
1187         }  // end if
1188         if(nfhits == 2) {
1189             cout << "Split cluster: " << endl;
1190             clusterJ->PrintInfo();
1191             cout << " in: " << endl;
1192             for (i=0; i<nfhits; i++) {
1193                 // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,
1194                                                -1,-1,(Float_t)qfit[i],ncl,0,0,
1195                                                (Float_t)xfit[i],
1196                                                (Float_t)zfit[i],0,0,0,0,
1197                                                 tstart,tstop,astart,astop);
1198             //        AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,
1199             //                                 -1,(Float_t)qfit[i],0,0,0,
1200             //                                  (Float_t)xfit[i],
1201             //                                  (Float_t)zfit[i],0,0,0,0,
1202             //                                  tstart,tstop,astart,astop,ncl);
1203             // ???????????
1204             // if(wing == 1) xfit[i] *= (-1);
1205             Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1206             Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1207             Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1208             Float_t peakpos = clusterJ->PeakPos();
1209             Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1210             Float_t clusterDriftPath = Time*fDriftSpeed;
1211             clusterDriftPath = fSddLength-clusterDriftPath;
1212             AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,
1213                                                                  Time,qfit[i],
1214                                                clusterPeakAmplitude,peakpos,
1215                                                0.,0.,clusterDriftPath,
1216                                          clusteranodePath,clusterJ->Samples()/2
1217                                     ,tstart,tstop,0,0,0,astart,astop);
1218             clust->PrintInfo();
1219             iTS->AddCluster(1,clust);
1220             //        cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="
1221             // <<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]
1222             // <<","<<ncl<<endl;
1223             delete clust;
1224         }// nfhits loop
1225         fClusters->RemoveAt(j);
1226     } // if nfhits = 2
1227 } // cluster loop
1228 fClusters->Compress();
1229 fMap->ClearMap();
1230 */
1231     return;
1232 }
1233 //______________________________________________________________________
1234 void AliITSClusterFinderSDD::GetRecPoints(){
1235     // get rec points
1236     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1237     // get number of clusters for this module
1238     Int_t nofClusters = fClusters->GetEntriesFast();
1239     nofClusters -= fNclusters;
1240     const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1241     const Float_t kconv = 1.0e-4;
1242     const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1243     const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1244     Int_t i,j;
1245     Int_t ix, iz, idx=-1;
1246     AliITSdigitSDD *dig=0;
1247     Int_t ndigits=fDigits->GetEntriesFast();
1248     for(i=0; i<nofClusters; i++) {
1249         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1250         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1251         if(clusterI) idx=clusterI->PeakPos();
1252         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1253         // try peak neighbours - to be done
1254         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1255         if(!dig) {
1256             // try cog
1257             fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1258             dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1259             // if null try neighbours
1260             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1261             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1262             if (!dig) printf("SDD: cannot assign the track number!\n");
1263         } //  end if !dig
1264         AliITSRecPoint rnew;
1265         rnew.SetX(clusterI->X());
1266         rnew.SetZ(clusterI->Z());
1267         rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1268         rnew.SetdEdX(kconvGeV*clusterI->Q());
1269         rnew.SetSigmaX2(kRMSx*kRMSx);
1270         rnew.SetSigmaZ2(kRMSz*kRMSz);
1271         if(dig){
1272             rnew.fTracks[0] = dig->fTracks[0];
1273             rnew.fTracks[1] = -3;
1274             rnew.fTracks[2] = -3;
1275             j=1;
1276             while(rnew.fTracks[0]==dig->fTracks[j] &&
1277                   j<dig->GetNTracks()) j++;
1278             if(j<dig->GetNTracks()){
1279                 rnew.fTracks[1] = dig->fTracks[j];
1280                 while((rnew.fTracks[0]==dig->fTracks[j] ||
1281                        rnew.fTracks[1]==dig->fTracks[j] )&&
1282                       j<dig->GetNTracks()) j++;
1283                 if(j<dig->GetNTracks()) rnew.fTracks[2] = dig->fTracks[j];
1284             } // end if
1285         } // end if
1286         //printf("SDD: i %d track1 track2 track3 %d %d %d x y %f %f\n",
1287         //         i,rnew.fTracks[0],rnew.fTracks[1],rnew.fTracks[2],c
1288         //         lusterI->X(),clusterI->Z());
1289         iTS->AddRecPoint(rnew);
1290     } // I clusters
1291 //    fMap->ClearMap();
1292 }
1293 //______________________________________________________________________
1294 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1295     // find raw clusters
1296
1297     fModule = mod;
1298
1299     Find1DClustersE();
1300     GroupClusters();
1301     SelectClusters();
1302     ResolveClustersE();
1303     GetRecPoints();
1304 }
1305 //_______________________________________________________________________
1306 void AliITSClusterFinderSDD::Print() const{
1307     // Print SDD cluster finder Parameters
1308
1309     cout << "**************************************************" << endl;
1310     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1311     cout << "**************************************************" << endl;
1312     cout << "Number of Clusters: " << fNclusters << endl;
1313     cout << "Anode Tolerance: " << fDAnode << endl;
1314     cout << "Time  Tolerance: " << fDTime << endl;
1315     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1316     cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1317     cout << "Minimum Amplitude: " << fMinPeak << endl;
1318     cout << "Minimum Charge: " << fMinCharge << endl;
1319     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1320     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1321     cout << "**************************************************" << endl;
1322 }