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   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 //
  19 //  Cluster finder
  20 //  for Silicon
  21 //  Drift Detector
  22 //
  23 #include <Riostream.h>
  24
  25 #include <TMath.h>
  26 #include <math.h>
  27
  28 #include "AliITSClusterFinderSDD.h"
  29 #include "AliITSMapA1.h"
  30 #include "AliITS.h"
  31 #include "AliITSdigit.h"
  32 #include "AliITSRawCluster.h"
  33 #include "AliITSRecPoint.h"
  34 #include "AliITSsegmentation.h"
  35 #include "AliITSresponseSDD.h"
  36 #include "AliRun.h"
  37
  38 ClassImp(AliITSClusterFinderSDD)
  39
  40 //______________________________________________________________________
  41 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSsegmentation *seg,
  42                                                AliITSresponse *response,
  43                                                TClonesArray *digits,
  44                                                TClonesArray *recp){
  45     // standard constructor
  46
  47     fSegmentation = seg;
  48     fResponse     = response;
  49     fDigits       = digits;
  50     fClusters     = recp;
  51     fNclusters    = fClusters->GetEntriesFast();
  52     SetCutAmplitude();
  53     SetDAnode();
  54     SetDTime();
  55     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
  56     //    SetMinPeak();
  57     SetMinNCells();
  58     SetMaxNCells();
  59     SetTimeCorr();
  60     SetMinCharge();
  61     fMap = new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
  62 }
  63 //______________________________________________________________________
  64 AliITSClusterFinderSDD::AliITSClusterFinderSDD(){
  65     // default constructor
  66
  67     fSegmentation = 0;
  68     fResponse     = 0;
  69     fDigits       = 0;
  70     fClusters     = 0;
  71     fNclusters    = 0;
  72     fMap          = 0;
  73     fCutAmplitude = 0;
  74     fDAnode = 0;
  75     fDTime = 0;
  76     fMinPeak = 0;
  77     fMinNCells = 0;
  78     fMaxNCells = 0;
  79     fTimeCorr = 0;
  80     fMinCharge = 0;
  81     /*
  82     SetDAnode();
  83     SetDTime();
  84     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
  85     SetMinNCells();
  86     SetMaxNCells();
  87     SetTimeCorr();
  88     SetMinCharge();
  89     */
  90 }
  91 //____________________________________________________________________________
  92 AliITSClusterFinderSDD::~AliITSClusterFinderSDD(){
  93     // destructor
  94
  95     if(fMap) delete fMap;
  96 }
  97 //______________________________________________________________________
  98 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma){
  99     // set the signal threshold for cluster finder
 100     Float_t baseline,noise,noiseAfterEl;
 101
 102     fResponse->GetNoiseParam(noise,baseline);
 103     noiseAfterEl = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
 104     fCutAmplitude = (Int_t)((baseline + nsigma*noiseAfterEl));
 105 }
 106 //______________________________________________________________________
 107 void AliITSClusterFinderSDD::Find1DClusters(){
 108     // find 1D clusters
 109     static AliITS *iTS = (AliITS*)gAlice->GetModule("ITS");
 110
 111     // retrieve the parameters
 112     Int_t fNofMaps       = fSegmentation->Npz();
 113     Int_t fMaxNofSamples = fSegmentation->Npx();
 114     Int_t fNofAnodes     = fNofMaps/2;
 115     Int_t dummy          = 0;
 116     Float_t fTimeStep    = fSegmentation->Dpx(dummy);
 117     Float_t fSddLength   = fSegmentation->Dx();
 118     Float_t fDriftSpeed  = fResponse->DriftSpeed();
 119     Float_t anodePitch   = fSegmentation->Dpz(dummy);
 120
 121     // map the signal
 122     fMap->ClearMap();
 123     fMap->SetThreshold(fCutAmplitude);
 124     fMap->FillMap();
 125
 126     Float_t noise;
 127     Float_t baseline;
 128     fResponse->GetNoiseParam(noise,baseline);
 129
 130     Int_t nofFoundClusters = 0;
 131     Int_t i;
 132     Float_t **dfadc = new Float_t*[fNofAnodes];
 133     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 134     Float_t fadc  = 0.;
 135     Float_t fadc1 = 0.;
 136     Float_t fadc2 = 0.;
 137     Int_t j,k,idx,l,m;
 138     for(j=0;j<2;j++) {
 139         for(k=0;k<fNofAnodes;k++) {
 140             idx = j*fNofAnodes+k;
 141             // signal (fadc) & derivative (dfadc)
 142             dfadc[k][255]=0.;
 143             for(l=0; l<fMaxNofSamples; l++) {
 144                 fadc2=(Float_t)fMap->GetSignal(idx,l);
 145                 if(l>0) fadc1=(Float_t)fMap->GetSignal(idx,l-1);
 146                 if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 147             } // samples
 148         } // anodes
 149
 150         for(k=0;k<fNofAnodes;k++) {
 151         //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 152             idx = j*fNofAnodes+k;
 153             Int_t imax  = 0;
 154             Int_t imaxd = 0;
 155             Int_t it    = 0;
 156             while(it <= fMaxNofSamples-3) {
 157                 imax  = it;
 158                 imaxd = it;
 159                 // maximum of signal
 160                 Float_t fadcmax  = 0.;
 161                 Float_t dfadcmax = 0.;
 162                 Int_t lthrmina   = 1;
 163                 Int_t lthrmint   = 3;
 164                 Int_t lthra      = 1;
 165                 Int_t lthrt      = 0;
 166                 for(m=0;m<20;m++) {
 167                     Int_t id = it+m;
 168                     if(id>=fMaxNofSamples) break;
 169                     fadc=(float)fMap->GetSignal(idx,id);
 170                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 171                     if(fadc > (float)fCutAmplitude) {
 172                         lthrt++;
 173                     } // end if
 174                     if(dfadc[k][id] > dfadcmax) {
 175                         dfadcmax = dfadc[k][id];
 176                         imaxd    = id;
 177                     } // end if
 178                 } // end for m
 179                 it = imaxd;
 180                 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 181                 // cluster charge
 182                 Int_t tstart = it-2;
 183                 if(tstart < 0) tstart = 0;
 184                 Bool_t ilcl = 0;
 185                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 186                 if(ilcl) {
 187                     nofFoundClusters++;
 188                     Int_t tstop      = tstart;
 189                     Float_t dfadcmin = 10000.;
 190                     Int_t ij;
 191                     for(ij=0; ij<20; ij++) {
 192                         if(tstart+ij > 255) { tstop = 255; break; }
 193                         fadc=(float)fMap->GetSignal(idx,tstart+ij);
 194                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 195                            (fadc > fCutAmplitude)) {
 196                             tstop = tstart+ij+5;
 197                             if(tstop > 255) tstop = 255;
 198                             dfadcmin = dfadc[k][it+ij];
 199                         } // end if
 200                     } // end for ij
 201
 202                     Float_t clusterCharge = 0.;
 203                     Float_t clusterAnode  = k+0.5;
 204                     Float_t clusterTime   = 0.;
 205                     Int_t   clusterMult   = 0;
 206                     Float_t clusterPeakAmplitude = 0.;
 207                     Int_t its,peakpos     = -1;
 208                     Float_t n, baseline;
 209                     fResponse->GetNoiseParam(n,baseline);
 210                     for(its=tstart; its<=tstop; its++) {
 211                         fadc=(float)fMap->GetSignal(idx,its);
 212                         if(fadc>baseline) fadc -= baseline;
 213                         else fadc = 0.;
 214                         clusterCharge += fadc;
 215                         // as a matter of fact we should take the peak
 216                         // pos before FFT
 217                         // to get the list of tracks !!!
 218                         if(fadc > clusterPeakAmplitude) {
 219                             clusterPeakAmplitude = fadc;
 220                             //peakpos=fMap->GetHitIndex(idx,its);
 221                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 222                             if(its>shift && its<(fMaxNofSamples-shift))
 223                                 peakpos  = fMap->GetHitIndex(idx,its+shift);
 224                             else peakpos = fMap->GetHitIndex(idx,its);
 225                             if(peakpos<0) peakpos =fMap->GetHitIndex(idx,its);
 226                         } // end if
 227                         clusterTime += fadc*its;
 228                         if(fadc > 0) clusterMult++;
 229                         if(its == tstop) {
 230                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 231                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 232                             //ns
 233                         } // end if
 234                     } // end for its
 235
 236                     Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 237                                                anodePitch;
 238                     Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 239                     clusterDriftPath = fSddLength-clusterDriftPath;
 240                     if(clusterCharge <= 0.) break;
 241                     AliITSRawClusterSDD clust(j+1,//i
 242                                               clusterAnode,clusterTime,//ff
 243                                               clusterCharge, //f
 244                                               clusterPeakAmplitude, //f
 245                                               peakpos, //i
 246                                               0.,0.,clusterDriftPath,//fff
 247                                               clusteranodePath, //f
 248                                               clusterMult, //i
 249                                               0,0,0,0,0,0,0);//7*i
 250                     iTS->AddCluster(1,&clust);
 251                     it = tstop;
 252                 } // ilcl
 253                 it++;
 254             } // while (samples)
 255         } // anodes
 256     } // detectors (2)
 257
 258     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 259     delete [] dfadc;
 260
 261     return;
 262 }
 263
 264
 265
 266 //______________________________________________________________________
 267 void AliITSClusterFinderSDD::Find1DClustersE(){
 268     // find 1D clusters
 269     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 270     // retrieve the parameters
 271     Int_t fNofMaps = fSegmentation->Npz();
 272     Int_t fMaxNofSamples = fSegmentation->Npx();
 273     Int_t fNofAnodes = fNofMaps/2;
 274     Int_t dummy=0;
 275     Float_t fTimeStep = fSegmentation->Dpx( dummy );
 276     Float_t fSddLength = fSegmentation->Dx();
 277     Float_t fDriftSpeed = fResponse->DriftSpeed();
 278     Float_t anodePitch = fSegmentation->Dpz( dummy );
 279     Float_t n, baseline;
 280     fResponse->GetNoiseParam( n, baseline );
 281     // map the signal
 282     fMap->ClearMap();
 283     fMap->SetThreshold( fCutAmplitude );
 284     fMap->FillMap();
 285
 286     Int_t nClu = 0;
 287     //        cout << "Search  cluster... "<< endl;
 288     for( Int_t j=0; j<2; j++ ){
 289         for( Int_t k=0; k<fNofAnodes; k++ ){
 290             Int_t idx = j*fNofAnodes+k;
 291             Bool_t on = kFALSE;
 292             Int_t start = 0;
 293             Int_t nTsteps = 0;
 294             Float_t fmax = 0.;
 295             Int_t lmax = 0;
 296             Float_t charge = 0.;
 297             Float_t time = 0.;
 298             Float_t anode = k+0.5;
 299             Int_t peakpos = -1;
 300             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 301                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 302                 if( fadc > 0.0 ){
 303                     if( on == kFALSE && l<fMaxNofSamples-4){
 304                         // star RawCluster (reset var.)
 305                         Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 306                         if( fadc1 < fadc ) continue;
 307                         start = l;
 308                         fmax = 0.;
 309                         lmax = 0;
 310                         time = 0.;
 311                         charge = 0.;
 312                         on = kTRUE;
 313                         nTsteps = 0;
 314                     } // end if on...
 315                     nTsteps++ ;
 316                     if( fadc > baseline ) fadc -= baseline;
 317                     else fadc=0.;
 318                     charge += fadc;
 319                     time += fadc*l;
 320                     if( fadc > fmax ){
 321                         fmax = fadc;
 322                         lmax = l;
 323                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 324                         if( l > shift && l < (fMaxNofSamples-shift) )
 325                             peakpos = fMap->GetHitIndex( idx, l+shift );
 326                         else
 327                             peakpos = fMap->GetHitIndex( idx, l );
 328                         if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
 329                     } // end if fadc
 330                 }else{ // end fadc>0
 331                     if( on == kTRUE ){
 332                         if( nTsteps > 2 ){
 333                             //  min # of timesteps for a RawCluster
 334                             // Found a RawCluster...
 335                             Int_t stop = l-1;
 336                             time /= (charge/fTimeStep);   // ns
 337                                 // time = lmax*fTimeStep;   // ns
 338                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 339                             Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 340                             Float_t driftPath = time*fDriftSpeed;
 341                             driftPath = fSddLength-driftPath;
 342                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 343                                                       fmax, peakpos,0.,0.,
 344                                                       driftPath,anodePath,
 345                                                       nTsteps,start,stop,
 346                                                       start, stop, 1, k, k );
 347                             iTS->AddCluster( 1, &clust );
 348                             //        clust.PrintInfo();
 349                             nClu++;
 350                         } // end if nTsteps
 351                         on = kFALSE;
 352                     } // end if on==kTRUE
 353                 } // end if fadc>0
 354             } // samples
 355         } // anodes
 356     } // wings
 357     //        cout << "# Rawclusters " << nClu << endl;
 358     return;
 359 }
 360 //_______________________________________________________________________
 361 Int_t AliITSClusterFinderSDD::SearchPeak(Float_t *spect,Int_t xdim,Int_t zdim,
 362                                          Int_t *peakX, Int_t *peakZ,
 363                                          Float_t *peakAmp, Float_t minpeak ){
 364     // search peaks on a 2D cluster
 365     Int_t npeak = 0;    // # peaks
 366     Int_t i,j;
 367     // search peaks
 368     for( Int_t z=1; z<zdim-1; z++ ){
 369         for( Int_t x=1; x<xdim-2; x++ ){
 370             Float_t sxz = spect[x*zdim+z];
 371             Float_t sxz1 = spect[(x+1)*zdim+z];
 372             Float_t sxz2 = spect[(x-1)*zdim+z];
 373             // search a local max. in s[x,z]
 374             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 375             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 376                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 377                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 378                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 379                 // peak found
 380                 peakX[npeak] = x;
 381                 peakZ[npeak] = z;
 382                 peakAmp[npeak] = sxz;
 383                 npeak++;
 384             } // end if ....
 385         } // end for x
 386     } // end for z
 387     // search groups of peaks with same amplitude.
 388     Int_t *flag = new Int_t[npeak];
 389     for( i=0; i<npeak; i++ ) flag[i] = 0;
 390     for( i=0; i<npeak; i++ ){
 391         for( j=0; j<npeak; j++ ){
 392             if( i==j) continue;
 393             if( flag[j] > 0 ) continue;
 394             if( peakAmp[i] == peakAmp[j] &&
 395                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 396                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 397                 if( flag[i] == 0) flag[i] = i+1;
 398                 flag[j] = flag[i];
 399             } // end if ...
 400         } // end for j
 401     } // end for i
 402     // make average of peak groups
 403     for( i=0; i<npeak; i++ ){
 404         Int_t nFlag = 1;
 405         if( flag[i] <= 0 ) continue;
 406         for( j=0; j<npeak; j++ ){
 407             if( i==j ) continue;
 408             if( flag[j] != flag[i] ) continue;
 409             peakX[i] += peakX[j];
 410             peakZ[i] += peakZ[j];
 411             nFlag++;
 412             npeak--;
 413             for( Int_t k=j; k<npeak; k++ ){
 414                 peakX[k] = peakX[k+1];
 415                 peakZ[k] = peakZ[k+1];
 416                 peakAmp[k] = peakAmp[k+1];
 417                 flag[k] = flag[k+1];
 418             } // end for k
 419             j--;
 420         } // end for j
 421         if( nFlag > 1 ){
 422             peakX[i] /= nFlag;
 423             peakZ[i] /= nFlag;
 424         } // end fi nFlag
 425     } // end for i
 426     delete [] flag;
 427     return( npeak );
 428 }
 429 //______________________________________________________________________
 430 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par,
 431                                        Float_t *spe, Float_t *integral){
 432     // function used to fit the clusters
 433     // par -> parameters..
 434     // par[0]  number of peaks.
 435     // for each peak i=1, ..., par[0]
 436     //                 par[i] = Ampl.
 437     //                 par[i+1] = xpos
 438     //                 par[i+2] = zpos
 439     //                 par[i+3] = tau
 440     //                 par[i+4] = sigma.
 441     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 442     const Int_t knParam = 5;
 443     Int_t npeak = (Int_t)par[0];
 444
 445     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 446
 447     Int_t k = 1;
 448     for( Int_t i=0; i<npeak; i++ ){
 449         if( integral != 0 ) integral[i] = 0.;
 450         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 451         Float_t t2 = par[k+3];   // PASCAL
 452         if( electronics == 2 ) { t2 *= t2; t2 *= 2; } // OLA
 453         for( Int_t z=0; z<zdim; z++ ){
 454             for( Int_t x=0; x<xdim; x++ ){
 455                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 456                 Float_t x2 = 0.;
 457                 Float_t signal = 0.;
 458                 if( electronics == 1 ){ // PASCAL
 459                     x2 = (x-par[k+1]+t2)/t2;
 460                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 461                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 462                 }else if( electronics == 2 ) { // OLA
 463                     x2 = (x-par[k+1])*(x-par[k+1])/t2;
 464                     signal = par[k]  * exp( -x2 - z2 );
 465                 } else {
 466                   Warning("PeakFunc","Wrong SDD Electronics = %d",electronics);
 467                     // exit( 1 );
 468                 } // end if electronicx
 469                 spe[x*zdim+z] += signal;
 470                 if( integral != 0 ) integral[i] += signal;
 471             } // end for x
 472         } // end for z
 473         k += knParam;
 474     } // end for i
 475     return;
 476 }
 477 //__________________________________________________________________________
 478 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
 479                                         Float_t *speFit ) const{
 480     // EVALUATES UNNORMALIZED CHI-SQUARED
 481     Float_t chi2 = 0.;
 482     for( Int_t z=0; z<zdim; z++ ){
 483         for( Int_t x=1; x<xdim-1; x++ ){
 484             Int_t index = x*zdim+z;
 485             Float_t tmp = spe[index] - speFit[index];
 486             chi2 += tmp*tmp;
 487         } // end for x
 488     } // end for z
 489     return( chi2 );
 490 }
 491 //_______________________________________________________________________
 492 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param,
 493                                     Float_t *prm0,Float_t *steprm,
 494                                     Float_t *chisqr,Float_t *spe,
 495                                     Float_t *speFit ){
 496     //
 497     Int_t   k, nnn, mmm, i;
 498     Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 499     const Int_t knParam = 5;
 500     Int_t npeak = (Int_t)param[0];
 501     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 502     for( k=1; k<(npeak*knParam+1); k++ ){
 503         p1 = param[k];
 504         delta = steprm[k];
 505         d1 = delta;
 506         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 507         if( fabs( p1 ) > 1.0E-6 )
 508             if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 509             else  delta = (Float_t)1.0E-4;
 510         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 511         PeakFunc( xdim, zdim, param, speFit );
 512         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 513         p2 = p1+delta;
 514         param[k] = p2;
 515         PeakFunc( xdim, zdim, param, speFit );
 516         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 517         if( chisq1 < chisq2 ){
 518             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 519             delta = -delta;
 520             t = p1;
 521             p1 = p2;
 522             p2 = t;
 523             t = chisq1;
 524             chisq1 = chisq2;
 525             chisq2 = t;
 526         } // end if
 527         i = 1; nnn = 0;
 528         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 529             nnn++;
 530             p3 = p2 + delta;
 531             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 532             if( mmm == 0 ){
 533                 d1 = delta;
 534                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 535                 delta *= 5;
 536             } // end if
 537             param[k] = p3;
 538             // Constrain paramiters
 539             Int_t kpos = (k-1) % knParam;
 540             switch( kpos ){
 541             case 0 :
 542                 if( param[k] <= 20 ) param[k] = fMinPeak;
 543                 break;
 544             case 1 :
 545                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 546                 break;
 547             case 2 :
 548                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 549                 break;
 550             case 3 :
 551                 if( param[k] < .5 ) param[k] = .5;
 552                 break;
 553             case 4 :
 554                 if( param[k] < .288 ) param[k] = .288;        // 1/sqrt(12) = 0.288
 555                 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 556                 break;
 557             }; // end switch
 558             PeakFunc( xdim, zdim, param, speFit );
 559             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 560             if( chisq3 < chisq2 && nnn < 50 ){
 561                 p1 = p2;
 562                 p2 = p3;
 563                 chisq1 = chisq2;
 564                 chisq2 = chisq3;
 565             }else i=0;
 566         } while( i );
 567         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 568         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 569         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 570         if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 571         else p0 = 10000;
 572         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 573         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 574         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 575         //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 576         //if( fabs( p2-p0 ) > dp ) p0 = p2;
 577         param[k] = p0;
 578         // Constrain paramiters
 579         Int_t kpos = (k-1) % knParam;
 580         switch( kpos ){
 581         case 0 :
 582             if( param[k] <= 20 ) param[k] = fMinPeak;
 583             break;
 584         case 1 :
 585             if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 586             break;
 587         case 2 :
 588             if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 589             break;
 590         case 3 :
 591             if( param[k] < .5 ) param[k] = .5;
 592             break;
 593         case 4 :
 594             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 595             if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 596             break;
 597         }; // end switch
 598         PeakFunc( xdim, zdim, param, speFit );
 599         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 600         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 601         if( chisqt <= *chisqr ) *chisqr = chisqt;
 602         else param[k] = prm0[k];
 603         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 604         steprm[k] = (param[k]-prm0[k])/5;
 605         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 606     } // end for k
 607     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 608     PeakFunc( xdim, zdim, param, speFit );
 609     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 610     return;
 611 }
 612 //_________________________________________________________________________
 613 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 614                                            Float_t *param, Float_t *spe,
 615                                            Int_t *niter, Float_t *chir ){
 616     // fit method from Comput. Phys. Commun 46(1987) 149
 617     const Float_t kchilmt = 0.01;  //        relative accuracy
 618     const Int_t   knel = 3;        //        for parabolic minimization
 619     const Int_t   knstop = 50;     //        Max. iteration number
 620     const Int_t   knParam = 5;
 621     Int_t npeak = (Int_t)param[0];
 622     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 623     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 624     Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 625     Int_t   n, k, iterNum = 0;
 626     Float_t *prm0 = new Float_t[npeak*knParam+1];
 627     Float_t *step = new Float_t[npeak*knParam+1];
 628     Float_t *schi = new Float_t[npeak*knParam+1];
 629     Float_t *sprm[3];
 630     sprm[0] = new Float_t[npeak*knParam+1];
 631     sprm[1] = new Float_t[npeak*knParam+1];
 632     sprm[2] = new Float_t[npeak*knParam+1];
 633     Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 634     Float_t *speFit = new Float_t[ xdim*zdim ];
 635     PeakFunc( xdim, zdim, param, speFit );
 636     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 637     chi1 = chi0;
 638     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 639         for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 640             step[k] = param[k] / 20.0 ;
 641             step[k+1] = param[k+1] / 50.0;
 642             step[k+2] = param[k+2] / 50.0;
 643             step[k+3] = param[k+3] / 20.0;
 644             step[k+4] = param[k+4] / 20.0;
 645         } // end for k
 646     Int_t out = 0;
 647     do{
 648         iterNum++;
 649             chi0 = chi1;
 650             Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 651             reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 652         // EXIT conditions
 653         if( reldif < (float) kchilmt ){
 654             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 655             *niter = iterNum;
 656             out = 0;
 657             break;
 658         } // end if
 659         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 660             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 661             *niter = iterNum;
 662             out = 0;
 663             break;
 664         } // end if
 665         if( iterNum > 5*knstop ){
 666             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 667             *niter = iterNum;
 668             out = 1;
 669             break;
 670         } // end if
 671         if( iterNum <= knel ) continue;
 672         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 673         if( n > 3 || n == 0 ) continue;
 674         schi[n-1] = chi1;
 675         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 676         if( n != 3 ) continue;
 677         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 678         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 679         for( k=1; k<(npeak*knParam+1); k++ ){
 680             Float_t tmp0 = sprm[0][k];
 681             Float_t tmp1 = sprm[1][k];
 682             Float_t tmp2 = sprm[2][k];
 683             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 684             a += (schi[2]*(tmp0-tmp1));
 685             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 686             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 687                                              (tmp0*tmp0-tmp1*tmp1)));
 688             if ((double)a < 1.0E-6) prmin = 0;
 689             else prmin = (float) (0.5*b/a);
 690             dp = 5*(tmp2-tmp0);
 691             if( fabs(prmin-tmp2) > fabs(dp) ) prmin = tmp2+dp;
 692             param[k] = prmin;
 693             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 694         } // end for k
 695     } while( kTRUE );
 696     delete [] prm0;
 697     delete [] step;
 698     delete [] schi;
 699     delete [] sprm[0];
 700     delete [] sprm[1];
 701     delete [] sprm[2];
 702     delete [] speFit;
 703     return( out );
 704 }
 705
 706 //______________________________________________________________________
 707 void AliITSClusterFinderSDD::ResolveClustersE(){
 708     // The function to resolve clusters if the clusters overlapping exists
 709     Int_t i;
 710     static AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 711     // get number of clusters for this module
 712     Int_t nofClusters = fClusters->GetEntriesFast();
 713     nofClusters -= fNclusters;
 714     Int_t fNofMaps = fSegmentation->Npz();
 715     Int_t fNofAnodes = fNofMaps/2;
 716     Int_t fMaxNofSamples = fSegmentation->Npx();
 717     Int_t dummy=0;
 718     Double_t fTimeStep = fSegmentation->Dpx( dummy );
 719     Double_t fSddLength = fSegmentation->Dx();
 720     Double_t fDriftSpeed = fResponse->DriftSpeed();
 721     Double_t anodePitch = fSegmentation->Dpz( dummy );
 722     Float_t n, baseline;
 723     fResponse->GetNoiseParam( n, baseline );
 724     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 725
 726     for( Int_t j=0; j<nofClusters; j++ ){
 727         // get cluster information
 728         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 729         Int_t astart = clusterJ->Astart();
 730         Int_t astop = clusterJ->Astop();
 731         Int_t tstart = clusterJ->Tstartf();
 732         Int_t tstop = clusterJ->Tstopf();
 733         Int_t wing = (Int_t)clusterJ->W();
 734         if( wing == 2 ){
 735             astart += fNofAnodes;
 736             astop  += fNofAnodes;
 737         } // end if
 738         Int_t xdim = tstop-tstart+3;
 739         Int_t zdim = astop-astart+3;
 740         if(xdim > 50 || zdim > 30) {
 741           Warning("ResolveClustersE","xdim: %d , zdim: %d ",xdim,zdim);
 742           continue;
 743         }
 744         Float_t *sp = new Float_t[ xdim*zdim+1 ];
 745         memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 746
 747         // make a local map from cluster region
 748         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 749             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 750                 Float_t fadc = fMap->GetSignal( ianode, itime );
 751                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 752                 else fadc = 0.;
 753                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 754                 sp[index] = fadc;
 755             } // time loop
 756         } // anode loop
 757
 758         // search peaks on cluster
 759         const Int_t kNp = 150;
 760         Int_t peakX1[kNp];
 761         Int_t peakZ1[kNp];
 762         Float_t peakAmp1[kNp];
 763         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 764
 765         // if multiple peaks, split cluster
 766         if( npeak >= 1 )
 767         {
 768             //        cout << "npeak " << npeak << endl;
 769             //        clusterJ->PrintInfo();
 770             Float_t *par = new Float_t[npeak*5+1];
 771             par[0] = (Float_t)npeak;
 772             // Initial parameters in cell dimentions
 773             Int_t k1 = 1;
 774             for( i=0; i<npeak; i++ ){
 775                 par[k1] = peakAmp1[i];
 776                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 777                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 778                 if( electronics == 1 )
 779                     par[k1+3] = 2.; // PASCAL
 780                 else if( electronics == 2 )
 781                     par[k1+3] = 0.7; // tau [timebin]  OLA
 782                 par[k1+4] = .4;    // sigma        [anodepich]
 783                 k1+=5;
 784             } // end for i
 785             Int_t niter;
 786             Float_t chir;
 787             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 788             Float_t peakX[kNp];
 789             Float_t peakZ[kNp];
 790             Float_t sigma[kNp];
 791             Float_t tau[kNp];
 792             Float_t peakAmp[kNp];
 793             Float_t integral[kNp];
 794             //get integrals => charge for each peak
 795             PeakFunc( xdim, zdim, par, sp, integral );
 796             k1 = 1;
 797             for( i=0; i<npeak; i++ ){
 798                 peakAmp[i] = par[k1];
 799                 peakX[i] = par[k1+1];
 800                 peakZ[i] = par[k1+2];
 801                 tau[i] = par[k1+3];
 802                 sigma[i] = par[k1+4];
 803                 k1+=5;
 804             } // end for i
 805             // calculate parameter for new clusters
 806             for( i=0; i<npeak; i++ ){
 807                 AliITSRawClusterSDD clusterI( *clusterJ );
 808                 Int_t newAnode = peakZ1[i]-1 + astart;
 809                 Int_t newiTime = peakX1[i]-1 + tstart;
 810                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 811                 if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )
 812                     shift = 0;
 813                 Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 814                 clusterI.SetPeakPos( peakpos );
 815                 clusterI.SetPeakAmpl( peakAmp1[i] );
 816                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 817                 Float_t newiTimef = peakX[i] - 1 + tstart;
 818                 if( wing == 2 ) newAnodef -= fNofAnodes;
 819                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 820                 newiTimef *= fTimeStep;
 821                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 822                 if( electronics == 1 ){
 823                 //    newiTimef *= 0.999438;    // PASCAL
 824                 //    newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 825                 }else if( electronics == 2 )
 826                     newiTimef *= 0.99714;    // OLA
 827                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 828                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 829                 clusterI.SetX( driftPath*sign * 0.0001 );
 830                 clusterI.SetZ( anodePath * 0.0001 );
 831                 clusterI.SetAnode( newAnodef );
 832                 clusterI.SetTime( newiTimef );
 833                 clusterI.SetAsigma( sigma[i]*anodePitch );
 834                 clusterI.SetTsigma( tau[i]*fTimeStep );
 835                 clusterI.SetQ( integral[i] );
 836                 //    clusterI.PrintInfo();
 837                 iTS->AddCluster( 1, &clusterI );
 838             } // end for i
 839             fClusters->RemoveAt( j );
 840             delete [] par;
 841         } else {  // something odd
 842           Warning("ResolveClustersE","--- Peak not found!!!!  minpeak=%d ,cluster peak= %f , module= %d",fMinPeak,clusterJ->PeakAmpl(),fModule);
 843           clusterJ->PrintInfo();
 844           Warning("ResolveClustersE"," xdim= %d zdim= %d",xdim-2,zdim-2);
 845         }
 846         delete [] sp;
 847     } // cluster loop
 848     fClusters->Compress();
 849 //    fMap->ClearMap();
 850 }
 851
 852
 853 //________________________________________________________________________
 854 void  AliITSClusterFinderSDD::GroupClusters(){
 855     // group clusters
 856     Int_t dummy=0;
 857     Float_t fTimeStep = fSegmentation->Dpx(dummy);
 858     // get number of clusters for this module
 859     Int_t nofClusters = fClusters->GetEntriesFast();
 860     nofClusters -= fNclusters;
 861     AliITSRawClusterSDD *clusterI;
 862     AliITSRawClusterSDD *clusterJ;
 863     Int_t *label = new Int_t [nofClusters];
 864     Int_t i,j;
 865     for(i=0; i<nofClusters; i++) label[i] = 0;
 866     for(i=0; i<nofClusters; i++) {
 867         if(label[i] != 0) continue;
 868         for(j=i+1; j<nofClusters; j++) {
 869             if(label[j] != 0) continue;
 870             clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 871             clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 872             // 1.3 good
 873             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 874             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 875             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 876             if(!pair) continue;
 877             //      clusterI->PrintInfo();
 878             //      clusterJ->PrintInfo();
 879             clusterI->Add(clusterJ);
 880             label[j] = 1;
 881             fClusters->RemoveAt(j);
 882             j=i; // <- Ernesto
 883         } // J clusters
 884         label[i] = 1;
 885     } // I clusters
 886     fClusters->Compress();
 887
 888     delete [] label;
 889     return;
 890 }
 891 //________________________________________________________________________
 892 void AliITSClusterFinderSDD::SelectClusters(){
 893     // get number of clusters for this module
 894     Int_t nofClusters = fClusters->GetEntriesFast();
 895
 896     nofClusters -= fNclusters;
 897     Int_t i;
 898     for(i=0; i<nofClusters; i++) {
 899         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
 900         Int_t rmflg = 0;
 901         Float_t wy = 0.;
 902         if(clusterI->Anodes() != 0.) {
 903             wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
 904         } // end if
 905         Int_t amp = (Int_t) clusterI->PeakAmpl();
 906         Int_t cha = (Int_t) clusterI->Q();
 907         if(amp < fMinPeak) rmflg = 1;
 908         if(cha < fMinCharge) rmflg = 1;
 909         if(wy < fMinNCells) rmflg = 1;
 910         //if(wy > fMaxNCells) rmflg = 1;
 911         if(rmflg) fClusters->RemoveAt(i);
 912     } // I clusters
 913     fClusters->Compress();
 914     return;
 915 }
 916 //__________________________________________________________________________
 917 void AliITSClusterFinderSDD::ResolveClusters(){
 918     // The function to resolve clusters if the clusters overlapping exists
 919 /*    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 920     // get number of clusters for this module
 921     Int_t nofClusters = fClusters->GetEntriesFast();
 922     nofClusters -= fNclusters;
 923     //cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","
 924     // <<fNclusters<<endl;
 925     Int_t fNofMaps = fSegmentation->Npz();
 926     Int_t fNofAnodes = fNofMaps/2;
 927     Int_t dummy=0;
 928     Double_t fTimeStep = fSegmentation->Dpx(dummy);
 929     Double_t fSddLength = fSegmentation->Dx();
 930     Double_t fDriftSpeed = fResponse->DriftSpeed();
 931     Double_t anodePitch = fSegmentation->Dpz(dummy);
 932     Float_t n, baseline;
 933     fResponse->GetNoiseParam(n,baseline);
 934     Float_t dzz_1A = anodePitch * anodePitch / 12;
 935     // fill Map of signals
 936     fMap->FillMap();
 937     Int_t j,i,ii,ianode,anode,itime;
 938     Int_t wing,astart,astop,tstart,tstop,nanode;
 939     Double_t fadc,ClusterTime;
 940     Double_t q[400],x[400],z[400]; // digit charges and coordinates
 941     for(j=0; j<nofClusters; j++) {
 942         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 943         Int_t ndigits = 0;
 944         astart=clusterJ->Astart();
 945         astop=clusterJ->Astop();
 946         tstart=clusterJ->Tstartf();
 947         tstop=clusterJ->Tstopf();
 948         nanode=clusterJ->Anodes();  // <- Ernesto
 949         wing=(Int_t)clusterJ->W();
 950         if(wing == 2) {
 951             astart += fNofAnodes;
 952             astop  += fNofAnodes;
 953         }  // end if
 954         // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
 955         //      <<tstart<<","<<tstop<<endl;
 956         // clear the digit arrays
 957         for(ii=0; ii<400; ii++) {
 958             q[ii] = 0.;
 959             x[ii] = 0.;
 960             z[ii] = 0.;
 961         } // end for ii
 962
 963         for(ianode=astart; ianode<=astop; ianode++) {
 964             for(itime=tstart; itime<=tstop; itime++) {
 965                 fadc=fMap->GetSignal(ianode,itime);
 966                 if(fadc>baseline) {
 967                     fadc-=(Double_t)baseline;
 968                     q[ndigits] = fadc*(fTimeStep/160);  // KeV
 969                     anode = ianode;
 970                     if(wing == 2) anode -= fNofAnodes;
 971                     z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
 972                     ClusterTime = itime*fTimeStep;
 973                     if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;// ns
 974                     x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
 975                     if(wing == 1) x[ndigits] *= (-1);
 976                     // cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","
 977                     //     <<fadc<<endl;
 978                     // cout<<"wing,anode,ndigits,charge ="<<wing<<","
 979                     //      <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
 980                     ndigits++;
 981                     continue;
 982                 } //  end if
 983                 fadc=0;
 984                 //              cout<<"fadc=0, ndigits ="<<ndigits<<endl;
 985             } // time loop
 986         } // anode loop
 987         //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
 988         // Fit cluster to resolve for two separate ones --------------------
 989         Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
 990         Double_t dxx=0., dzz=0., dxz=0.;
 991         Double_t scl = 0., tmp, tga, elps = -1.;
 992         Double_t xfit[2], zfit[2], qfit[2];
 993         Double_t pitchz = anodePitch*1.e-4;             // cm
 994         Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
 995         Double_t sigma2;
 996         Int_t nfhits;
 997         Int_t nbins = ndigits;
 998         Int_t separate = 0;
 999         // now, all lengths are in microns
1000         for (ii=0; ii<nbins; ii++) {
1001             qq += q[ii];
1002             xm += x[ii]*q[ii];
1003             zm += z[ii]*q[ii];
1004             xx += x[ii]*x[ii]*q[ii];
1005             zz += z[ii]*z[ii]*q[ii];
1006             xz += x[ii]*z[ii]*q[ii];
1007         } // end for ii
1008         xm /= qq;
1009         zm /= qq;
1010         xx /= qq;
1011         zz /= qq;
1012         xz /= qq;
1013         dxx = xx - xm*xm;
1014         dzz = zz - zm*zm;
1015         dxz = xz - xm*zm;
1016
1017         // shrink the cluster in the time direction proportionaly to the
1018         // dxx/dzz, which lineary depends from the drift path
1019         // new  Ernesto........
1020         if( nanode == 1 ){
1021             dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
1022             scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
1023         } // end if
1024         if( nanode == 2 ){
1025             scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1026         } // end if
1027         if( nanode == 3 ){
1028             scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1029         } // end if
1030         if( nanode > 3 ){
1031             scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
1032         } // end if
1033         //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","
1034         //  <<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
1035         //  old Boris.........
1036         //  tmp=29730. - 585.*fabs(xm/1000.);
1037         //  scl=TMath::Sqrt(tmp/130000.);
1038
1039         xm *= scl;
1040         xx *= scl*scl;
1041         xz *= scl;
1042
1043         dxx = xx - xm*xm;
1044         //   dzz = zz - zm*zm;
1045         dxz = xz - xm*zm;
1046         //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1047         // <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1048         // if(dzz < 7200.) dzz=7200.;//for one anode cluster dzz = anode**2/12
1049
1050         if (dxx < 0.) dxx=0.;
1051         // the data if no cluster overlapping (the coordunates are in cm)
1052         nfhits = 1;
1053         xfit[0] = xm*1.e-4;
1054         zfit[0] = zm*1.e-4;
1055         qfit[0] = qq;
1056         //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1057
1058         if (nbins >= 7) {
1059             if (dxz==0.) tga=0.;
1060             else {
1061                 tmp=0.5*(dzz-dxx)/dxz;
1062                 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1063                                                    tmp+TMath::Sqrt(tmp*tmp+1);
1064             } // end if dxz
1065             elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1066             // change from microns to cm
1067             xm *= 1.e-4;
1068             zm *= 1.e-4;
1069             zz *= 1.e-8;
1070             xx *= 1.e-8;
1071             xz *= 1.e-8;
1072             dxz *= 1.e-8;
1073             dxx *= 1.e-8;
1074             dzz *= 1.e-8;
1075             //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1076             //  <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1077             for (i=0; i<nbins; i++) {
1078                 x[i] = x[i] *= scl;
1079                 x[i] = x[i] *= 1.e-4;
1080                 z[i] = z[i] *= 1.e-4;
1081             } // end for i
1082             //     cout<<"!!! elps ="<<elps<<endl;
1083             if (elps < 0.3) { // try to separate hits
1084                 separate = 1;
1085                 tmp=atan(tga);
1086                 Double_t cosa=cos(tmp),sina=sin(tmp);
1087                 Double_t a1=0., x1=0., xxx=0.;
1088                 for (i=0; i<nbins; i++) {
1089                     tmp=x[i]*cosa + z[i]*sina;
1090                     if (q[i] > a1) {
1091                         a1=q[i];
1092                         x1=tmp;
1093                     } // end if
1094                     xxx += tmp*tmp*tmp*q[i];
1095                 } // end for i
1096                 xxx /= qq;
1097                 Double_t z12=-sina*xm + cosa*zm;
1098                 sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1099                 xm=cosa*xm + sina*zm;
1100                 xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1101                 Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1102                 Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1103                 for (i=0; i<33; i++) { // solve a system of equations
1104                     Double_t x1_old=x1, x2_old=x2, r_old=r;
1105                     Double_t c11=x1-x2;
1106                     Double_t c12=r;
1107                     Double_t c13=1-r;
1108                     Double_t c21=x1*x1 - x2*x2;
1109                     Double_t c22=2*r*x1;
1110                     Double_t c23=2*(1-r)*x2;
1111                     Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1112                     Double_t c32=3*r*(sigma2 + x1*x1);
1113                     Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1114                     Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1115                     Double_t f2=-(r*(sigma2+x1*x1)+(1-r)*(sigma2+x2*x2)- xx);
1116                     Double_t f3=-(r*x1*(3*sigma2+x1*x1)+(1-r)*x2*
1117                                                          (3*sigma2+x2*x2)-xxx);
1118                     Double_t d=c11*c22*c33+c21*c32*c13+c12*c23*c31-
1119                                        c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1120                     if (d==0.) {
1121                         cout<<"*********** d=0 ***********\n";
1122                         break;
1123                     } // end if
1124                     Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1125                         f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1126                     Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1127                         c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1128                     Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1129                         c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1130                     r  += dr/d;
1131                     x1 += d1/d;
1132                     x2 += d2/d;
1133                     if (fabs(x1-x1_old) > 0.0001) continue;
1134                     if (fabs(x2-x2_old) > 0.0001) continue;
1135                     if (fabs(r-r_old)/5 > 0.001) continue;
1136                     a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1137                     Double_t a2=a1*(1-r)/r;
1138                     qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina +
1139                                                                 z12*cosa;
1140                     qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
1141                                                                 z12*cosa;
1142                     nfhits=2;
1143                     break; // Ok !
1144                 } // end for i
1145                 if (i==33) cerr<<"No more iterations ! "<<endl;
1146             } // end of attempt to separate overlapped clusters
1147         } // end of nbins cut
1148         if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1149         if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="
1150                                                      <<elps<<","<<nfhits<<endl;
1151         if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1152         for (i=0; i<nfhits; i++) {
1153             xfit[i] *= (1.e+4/scl);
1154             if(wing == 1) xfit[i] *= (-1);
1155             zfit[i] *= 1.e+4;
1156             //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","
1157             // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1158         } // end for i
1159         Int_t ncl = nfhits;
1160         if(nfhits == 1 && separate == 1) {
1161             cout<<"!!!!! no separate"<<endl;
1162             ncl = -2;
1163         }  // end if
1164         if(nfhits == 2) {
1165             cout << "Split cluster: " << endl;
1166             clusterJ->PrintInfo();
1167             cout << " in: " << endl;
1168             for (i=0; i<nfhits; i++) {
1169                 // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,
1170                                                -1,-1,(Float_t)qfit[i],ncl,0,0,
1171                                                (Float_t)xfit[i],
1172                                                (Float_t)zfit[i],0,0,0,0,
1173                                                 tstart,tstop,astart,astop);
1174             //        AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,
1175             //                                 -1,(Float_t)qfit[i],0,0,0,
1176             //                                  (Float_t)xfit[i],
1177             //                                  (Float_t)zfit[i],0,0,0,0,
1178             //                                  tstart,tstop,astart,astop,ncl);
1179             // ???????????
1180             // if(wing == 1) xfit[i] *= (-1);
1181             Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1182             Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1183             Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1184             Float_t peakpos = clusterJ->PeakPos();
1185             Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1186             Float_t clusterDriftPath = Time*fDriftSpeed;
1187             clusterDriftPath = fSddLength-clusterDriftPath;
1188             AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,
1189                                                                  Time,qfit[i],
1190                                                clusterPeakAmplitude,peakpos,
1191                                                0.,0.,clusterDriftPath,
1192                                          clusteranodePath,clusterJ->Samples()/2
1193                                     ,tstart,tstop,0,0,0,astart,astop);
1194             clust->PrintInfo();
1195             iTS->AddCluster(1,clust);
1196             //        cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="
1197             // <<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]
1198             // <<","<<ncl<<endl;
1199             delete clust;
1200         }// nfhits loop
1201         fClusters->RemoveAt(j);
1202     } // if nfhits = 2
1203 } // cluster loop
1204 fClusters->Compress();
1205 fMap->ClearMap();
1206 */
1207     return;
1208 }
1209 //______________________________________________________________________
1210 void AliITSClusterFinderSDD::GetRecPoints(){
1211     // get rec points
1212     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1213     // get number of clusters for this module
1214     Int_t nofClusters = fClusters->GetEntriesFast();
1215     nofClusters -= fNclusters;
1216     const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1217     const Float_t kconv = 1.0e-4;
1218     const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1219     const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1220     Int_t i,j;
1221     Int_t ix, iz, idx=-1;
1222     AliITSdigitSDD *dig=0;
1223     Int_t ndigits=fDigits->GetEntriesFast();
1224     for(i=0; i<nofClusters; i++) {
1225         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1226         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1227         if(clusterI) idx=clusterI->PeakPos();
1228         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1229         // try peak neighbours - to be done
1230         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1231         //// debug
1232         //      cout<<"R.C. Anode = "<<clusterI->A()<<"; Time= "<<clusterI->T()<<endl;
1233         fSegmentation->LocalToDet(clusterI->X(),clusterI->Z(),ix,iz);
1234         //      cout<<"From R.C. coordinates- Anode: "<<iz<<" and time: "<<ix<<endl;
1235         // end debug
1236         Int_t trks[10];
1237         Int_t notr=-1;
1238         Int_t deger = 0;
1239         if(!dig) {
1240           Warning("GetRecPoints","Cannot assign the track number\n");
1241         }
1242         else {
1243           fSegmentation->LocalToDet(clusterI->X(),clusterI->Z(),ix,iz);
1244           Int_t signal[30];
1245           for(Int_t kk=0;kk<9;kk++)trks[kk]=-2;
1246           AliITSdigitSDD * pdig = 0;
1247           for(Int_t itime=ix-1;itime<=ix+1;itime++){
1248             if(itime<0 || itime>=fSegmentation->Npx())continue;
1249             for(Int_t ianod=iz-1;ianod<=iz+1;ianod++){
1250               if(ianod<0 || ianod>=fSegmentation->Npz())continue;
1251               if(iz==(fSegmentation->Npz())/2 && ianod<iz)continue;
1252               if(iz==(fSegmentation->Npz())/2-1 && ianod>iz)continue;
1253               pdig = (AliITSdigitSDD*)fMap->GetHit(ianod,itime);
1254               if(pdig){
1255                 for(Int_t kk=0;kk<3;kk++){
1256                   if(kk == 0 || (kk>0 && pdig->fTracks[kk]>=0)){
1257                     notr++;
1258                     trks[notr]=pdig->fTracks[kk];
1259                     signal[notr]=pdig->fSignal;
1260                   }
1261                 }
1262               }
1263             }
1264           } // for(itime....
1265           if((dig->fCoord1<(iz-1) || dig->fCoord1>(iz+1))
1266              && (dig->fCoord2<(ix-1) || dig->fCoord2>(ix+1))
1267              && dig->fTracks[0]>=-2){
1268             notr++;
1269             trks[notr]=dig->fTracks[0];
1270             signal[notr]=dig->fSignal;
1271           }
1272           for(Int_t ii=0; ii<notr;ii++){
1273             for(Int_t jj=ii+1; jj<=notr; jj++){
1274               if(trks[ii] == trks[jj]){
1275                 signal[ii]+=signal[jj];
1276                 signal[jj]=-100;
1277                 trks[jj]=-jj-100;
1278                 deger++;
1279               }
1280             }
1281           }
1282           Int_t ordtmp;
1283           for(Int_t ii=0; ii<notr;ii++){
1284             Int_t maxi = ii;
1285             for(Int_t jj=ii+1; jj<=notr; jj++){
1286               if(signal[jj]>signal[maxi])maxi=jj;
1287             }
1288             ordtmp = trks[ii];
1289             trks[ii]=trks[maxi];
1290             trks[maxi]=ordtmp;
1291             ordtmp = signal[ii];
1292             signal[ii]=signal[maxi];
1293             signal[maxi]=ordtmp;
1294           }
1295         }
1296         notr-=deger;
1297         notr++;
1298         /*
1299           if(!dig) {
1300             // try cog
1301             fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1302             dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1303             // if null try neighbours
1304             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1305             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1306             if (!dig) printf("SDD: cannot assign the track number!\n");
1307         } //  end if !dig
1308         */
1309         AliITSRecPoint rnew;
1310         rnew.SetX(clusterI->X());
1311         rnew.SetZ(clusterI->Z());
1312         rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1313         //      cout<<"Cluster # "<<i<< " - X,Z,Q= "<<clusterI->X()<<" "<<clusterI->Z()<<" "<<clusterI->Q()<<"; Digit n= "<<idx<<endl;
1314         rnew.SetdEdX(kconvGeV*clusterI->Q());
1315         rnew.SetSigmaX2(kRMSx*kRMSx);
1316         rnew.SetSigmaZ2(kRMSz*kRMSz);
1317         if(notr>3)notr=3;
1318         if(notr>=0)for(j=0;j<notr;j++)rnew.fTracks[j]=trks[j];
1319         /*
1320         if(dig){
1321           for(j=0;j<dig->GetNTracks();j++){
1322             if(j>0 && j%4==0)cout<<endl;
1323           }
1324           cout<<endl;
1325             rnew.fTracks[0] = dig->fTracks[0];
1326             cout<<"  "<<dig->fTracks[0]<<" assigned to rp 0 "<<rnew.fTracks[0]<<endl;
1327             rnew.fTracks[1] = -3;
1328             rnew.fTracks[2] = -3;
1329             j=1;
1330             while(rnew.fTracks[0]==dig->fTracks[j] &&
1331                   j<dig->GetNTracks()) j++;
1332             if(j<dig->GetNTracks()){
1333                 rnew.fTracks[1] = dig->fTracks[j];
1334                 cout<<"  Digit "<<j<<" "<<dig->fTracks[j]<<" assigned to rp 1 "<<rnew.fTracks[1]<<endl;
1335                 while((rnew.fTracks[0]==dig->fTracks[j] ||
1336                        rnew.fTracks[1]==dig->fTracks[j] )&&
1337                       j<dig->GetNTracks()) j++;
1338                 if(j<dig->GetNTracks()) {
1339                   rnew.fTracks[2] = dig->fTracks[j];
1340                   cout<<"  Digit "<<j<<" "<<dig->fTracks[j]<<" assigned to rp 2 "<<rnew.fTracks[2]<<endl;
1341                 }
1342             } // end if
1343         } // end if
1344         */
1345
1346         iTS->AddRecPoint(rnew);
1347     } // I clusters
1348 //    fMap->ClearMap();
1349 }
1350 //______________________________________________________________________
1351 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1352     // find raw clusters
1353
1354     fModule = mod;
1355
1356     Find1DClustersE();
1357     GroupClusters();
1358     SelectClusters();
1359     ResolveClustersE();
1360     GetRecPoints();
1361 }
1362 //_______________________________________________________________________
1363 void AliITSClusterFinderSDD::Print() const{
1364     // Print SDD cluster finder Parameters
1365
1366     cout << "**************************************************" << endl;
1367     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1368     cout << "**************************************************" << endl;
1369     cout << "Number of Clusters: " << fNclusters << endl;
1370     cout << "Anode Tolerance: " << fDAnode << endl;
1371     cout << "Time  Tolerance: " << fDTime << endl;
1372     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1373     cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1374     cout << "Minimum Amplitude: " << fMinPeak << endl;
1375     cout << "Minimum Charge: " << fMinCharge << endl;
1376     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1377     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1378     cout << "**************************************************" << endl;
1379 }