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
  24
  25 #include "AliITSClusterFinderSDD.h"
  26 #include "AliITSMapA1.h"
  27 #include "AliITSRawClusterSDD.h"
  28 #include "AliITSRecPoint.h"
  29 #include "AliITSdigitSDD.h"
  30 #include "AliITSDetTypeRec.h"
  31 #include "AliITSCalibrationSDD.h"
  32 #include "AliITSsegmentationSDD.h"
  33 #include "AliLog.h"
  34
  35 ClassImp(AliITSClusterFinderSDD)
  36
  37 //______________________________________________________________________
  38 AliITSClusterFinderSDD::AliITSClusterFinderSDD():
  39 AliITSClusterFinder(),
  40 fNclusters(0),
  41 fDAnode(0.0),
  42 fDTime(0.0),
  43 fTimeCorr(0.0),
  44 fCutAmplitude(0),
  45 fMinPeak(0),
  46 fMinCharge(0),
  47 fMinNCells(0),
  48 fMaxNCells(0){
  49     // default constructor
  50 }
  51 //______________________________________________________________________
  52 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSDetTypeRec* dettyp,
  53                                                TClonesArray *digits,
  54                                                TClonesArray *recp):
  55 AliITSClusterFinder(dettyp),
  56 fNclusters(0),
  57 fDAnode(0.0),
  58 fDTime(0.0),
  59 fTimeCorr(0.0),
  60 fCutAmplitude(0),
  61 fMinPeak(0),
  62 fMinCharge(0),
  63 fMinNCells(0),
  64 fMaxNCells(0){
  65     // standard constructor
  66
  67     SetDigits(digits);
  68     SetClusters(recp);
  69     SetCutAmplitude(fDetTypeRec->GetITSgeom()->GetStartSDD());
  70     SetDAnode();
  71     SetDTime();
  72     SetMinPeak((Int_t)((AliITSCalibrationSDD*)GetResp(fDetTypeRec->GetITSgeom()->GetStartSDD()))->GetNoiseAfterElectronics(0)*5);
  73     SetMinNCells();
  74     SetMaxNCells();
  75     SetTimeCorr();
  76     SetMinCharge();
  77     SetMap(new AliITSMapA1(GetSeg(),Digits(),fCutAmplitude));
  78 }
  79 //______________________________________________________________________
  80 void AliITSClusterFinderSDD::SetCutAmplitude(Int_t mod,Double_t nsigma){
  81     // set the signal threshold for cluster finder
  82     Double_t baseline,noiseAfterEl;
  83
  84
  85     Int_t nanodes = GetResp(mod)->Wings()*GetResp(mod)->Channels()*GetResp(mod)->Chips();
  86     fCutAmplitude.Set(nanodes);
  87     for(Int_t ian=0;ian<nanodes;ian++){
  88       baseline=GetResp(mod)->GetBaseline(ian);
  89       noiseAfterEl = ((AliITSCalibrationSDD*)GetResp(mod))->GetNoiseAfterElectronics(ian);
  90       fCutAmplitude[ian] = (Int_t)((baseline + nsigma*noiseAfterEl));
  91     }
  92 }
  93 //______________________________________________________________________
  94 void AliITSClusterFinderSDD::Find1DClusters(){
  95     // find 1D clusters
  96
  97     // retrieve the parameters
  98     Int_t fNofMaps       = GetSeg()->Npz();
  99     Int_t fMaxNofSamples = GetSeg()->Npx();
 100     Int_t fNofAnodes     = fNofMaps/2;
 101     Int_t dummy          = 0;
 102     Double_t fTimeStep    = GetSeg()->Dpx(dummy);
 103     Double_t fSddLength   = GetSeg()->Dx();
 104     Double_t anodePitch   = GetSeg()->Dpz(dummy);
 105     AliITSCalibrationSDD* cal = (AliITSCalibrationSDD*)GetResp(fModule);
 106     // map the signal
 107     Map()->ClearMap();
 108     Map()->SetThresholdArr(fCutAmplitude);
 109     Map()->FillMap2();
 110
 111     Int_t nofFoundClusters = 0;
 112     Int_t i;
 113     Double_t **dfadc = new Double_t*[fNofAnodes];
 114     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Double_t[fMaxNofSamples];
 115     Double_t fadc  = 0.;
 116     Double_t fadc1 = 0.;
 117     Double_t fadc2 = 0.;
 118     Int_t j,k,idx,l,m;
 119     for(j=0;j<2;j++) {
 120         for(k=0;k<fNofAnodes;k++) {
 121             idx = j*fNofAnodes+k;
 122             // signal (fadc) & derivative (dfadc)
 123             dfadc[k][255]=0.;
 124             for(l=0; l<fMaxNofSamples; l++) {
 125                 fadc2=(Double_t)Map()->GetSignal(idx,l);
 126                 if(l>0) fadc1=(Double_t)Map()->GetSignal(idx,l-1);
 127                 if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 128             } // samples
 129         } // anodes
 130
 131         for(k=0;k<fNofAnodes;k++) {
 132             AliDebug(5,Form("Anode: %d, Wing: %d",k+1,j+1));
 133             idx = j*fNofAnodes+k;
 134             Int_t imax  = 0;
 135             Int_t imaxd = 0;
 136             Int_t it    = 0;
 137             while(it <= fMaxNofSamples-3) {
 138                 imax  = it;
 139                 imaxd = it;
 140                 // maximum of signal
 141                 Double_t fadcmax  = 0.;
 142                 Double_t dfadcmax = 0.;
 143                 Int_t lthrmina   = 1;
 144                 Int_t lthrmint   = 3;
 145                 Int_t lthra      = 1;
 146                 Int_t lthrt      = 0;
 147                 for(m=0;m<20;m++) {
 148                     Int_t id = it+m;
 149                     if(id>=fMaxNofSamples) break;
 150                     fadc=(float)Map()->GetSignal(idx,id);
 151                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 152                     if(fadc > (float)fCutAmplitude[idx])lthrt++;
 153                     if(dfadc[k][id] > dfadcmax) {
 154                         dfadcmax = dfadc[k][id];
 155                         imaxd    = id;
 156                     } // end if
 157                 } // end for m
 158                 it = imaxd;
 159                 if(Map()->TestHit(idx,imax) == kEmpty) {it++; continue;}
 160                 // cluster charge
 161                 Int_t tstart = it-2;
 162                 if(tstart < 0) tstart = 0;
 163                 Bool_t ilcl = 0;
 164                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 165                 if(ilcl) {
 166                     nofFoundClusters++;
 167                     Int_t tstop      = tstart;
 168                     Double_t dfadcmin = 10000.;
 169                     Int_t ij;
 170                     for(ij=0; ij<20; ij++) {
 171                         if(tstart+ij > 255) { tstop = 255; break; }
 172                         fadc=(float)Map()->GetSignal(idx,tstart+ij);
 173                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 174                            (fadc > fCutAmplitude[idx])) {
 175                             tstop = tstart+ij+5;
 176                             if(tstop > 255) tstop = 255;
 177                             dfadcmin = dfadc[k][it+ij];
 178                         } // end if
 179                     } // end for ij
 180
 181                     Double_t clusterCharge = 0.;
 182                     Double_t clusterAnode  = k+0.5;
 183                     Double_t clusterTime   = 0.;
 184                     Int_t   clusterMult   = 0;
 185                     Double_t clusterPeakAmplitude = 0.;
 186                     Int_t its,peakpos     = -1;
 187                     //Double_t n, baseline;
 188                     //GetResp(fModule)->GetNoiseParam(n,baseline);
 189                     Double_t baseline=GetResp(fModule)->GetBaseline(idx);
 190                     for(its=tstart; its<=tstop; its++) {
 191                         fadc=(float)Map()->GetSignal(idx,its);
 192                         if(fadc>baseline) fadc -= baseline;
 193                         else fadc = 0.;
 194                         clusterCharge += fadc;
 195                         // as a matter of fact we should take the peak
 196                         // pos before FFT
 197                         // to get the list of tracks !!!
 198                         if(fadc > clusterPeakAmplitude) {
 199                             clusterPeakAmplitude = fadc;
 200                             //peakpos=Map()->GetHitIndex(idx,its);
 201                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 202                             if(its>shift && its<(fMaxNofSamples-shift))
 203                                 peakpos  = Map()->GetHitIndex(idx,its+shift);
 204                             else peakpos = Map()->GetHitIndex(idx,its);
 205                             if(peakpos<0) peakpos =Map()->GetHitIndex(idx,its);
 206                         } // end if
 207                         clusterTime += fadc*its;
 208                         if(fadc > 0) clusterMult++;
 209                         if(its == tstop) {
 210                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 211                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 212                             //ns
 213                         } // end if
 214                     } // end for its
 215
 216                     Double_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 217                                                  anodePitch;
 218                     Double_t clusterDriftPath = (Double_t)cal->GetDriftPath(clusterTime,clusteranodePath);
 219                     clusterDriftPath = fSddLength-clusterDriftPath;
 220                     if(clusterCharge <= 0.) break;
 221                     AliITSRawClusterSDD clust(j+1,//i
 222                                               clusterAnode,clusterTime,//ff
 223                                               clusterCharge, //f
 224                                               clusterPeakAmplitude, //f
 225                                               peakpos, //i
 226                                               0.,0.,clusterDriftPath,//fff
 227                                               clusteranodePath, //f
 228                                               clusterMult, //i
 229                                               0,0,0,0,0,0,0);//7*i
 230                     fDetTypeRec->AddCluster(1,&clust);
 231                     it = tstop;
 232                 } // ilcl
 233                 it++;
 234             } // while (samples)
 235         } // anodes
 236     } // detectors (2)
 237
 238     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 239     delete [] dfadc;
 240
 241     return;
 242 }
 243 //______________________________________________________________________
 244 void AliITSClusterFinderSDD::Find1DClustersE(){
 245     // find 1D clusters
 246     // retrieve the parameters
 247     Int_t fNofMaps = GetSeg()->Npz();
 248     Int_t fMaxNofSamples = GetSeg()->Npx();
 249     Int_t fNofAnodes = fNofMaps/2;
 250     Int_t dummy=0;
 251     Double_t fTimeStep = GetSeg()->Dpx( dummy );
 252     Double_t fSddLength = GetSeg()->Dx();
 253     Double_t anodePitch = GetSeg()->Dpz( dummy );
 254     AliITSCalibrationSDD* cal = (AliITSCalibrationSDD*)GetResp(fModule);
 255     Map()->ClearMap();
 256     Map()->SetThresholdArr( fCutAmplitude );
 257     Map()->FillMap2();
 258
 259     Int_t nClu = 0;
 260     //        cout << "Search  cluster... "<< endl;
 261     for( Int_t j=0; j<2; j++ ){
 262         for( Int_t k=0; k<fNofAnodes; k++ ){
 263             Int_t idx = j*fNofAnodes+k;
 264             Double_t baseline=GetResp(fModule)->GetBaseline(idx);
 265             Bool_t on = kFALSE;
 266             Int_t start = 0;
 267             Int_t nTsteps = 0;
 268             Double_t fmax = 0.;
 269             Int_t lmax = 0;
 270             Double_t charge = 0.;
 271             Double_t time = 0.;
 272             Double_t anode = k+0.5;
 273             Int_t peakpos = -1;
 274             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 275                 Double_t fadc = (Double_t)Map()->GetSignal( idx, l );
 276                 if( fadc > 0.0 ){
 277                     if( on == kFALSE && l<fMaxNofSamples-4){
 278                         // star RawCluster (reset var.)
 279                         Double_t fadc1 = (Double_t)Map()->GetSignal( idx, l+1 );
 280                         if( fadc1 < fadc ) continue;
 281                         start = l;
 282                         fmax = 0.;
 283                         lmax = 0;
 284                         time = 0.;
 285                         charge = 0.;
 286                         on = kTRUE;
 287                         nTsteps = 0;
 288                     } // end if on...
 289                     nTsteps++ ;
 290                     if( fadc > baseline ) fadc -= baseline;
 291                     else fadc=0.;
 292                     charge += fadc;
 293                     time += fadc*l;
 294                     if( fadc > fmax ){
 295                         fmax = fadc;
 296                         lmax = l;
 297                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 298                         if( l > shift && l < (fMaxNofSamples-shift) )
 299                             peakpos = Map()->GetHitIndex( idx, l+shift );
 300                         else
 301                             peakpos = Map()->GetHitIndex( idx, l );
 302                         if( peakpos < 0) peakpos = Map()->GetHitIndex(idx,l);
 303                     } // end if fadc
 304                 }else{ // end fadc>0
 305                     if( on == kTRUE ){
 306                         if( nTsteps > 2 ){
 307                             //  min # of timesteps for a RawCluster
 308                             // Found a RawCluster...
 309                             Int_t stop = l-1;
 310                             time /= (charge/fTimeStep);   // ns
 311                                 // time = lmax*fTimeStep;   // ns
 312                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 313                             Double_t anodePath =(anode-fNofAnodes/2)*anodePitch;
 314
 315                             Double_t driftPath = (Double_t)cal->GetDriftPath(time,anodePath);
 316                             driftPath = fSddLength-driftPath;
 317                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 318                                                       fmax, peakpos,0.,0.,
 319                                                       driftPath,anodePath,
 320                                                       nTsteps,start,stop,
 321                                                       start, stop, 1, k, k );
 322                             fDetTypeRec->AddCluster( 1, &clust );
 323                             if(AliDebugLevel()>=5) clust.PrintInfo();
 324                             nClu++;
 325                         } // end if nTsteps
 326                         on = kFALSE;
 327                     } // end if on==kTRUE
 328                 } // end if fadc>0
 329             } // samples
 330         } // anodes
 331     } // wings
 332     AliDebug(3,Form("# Rawclusters %d",nClu));
 333     return;
 334 }
 335 //_______________________________________________________________________
 336 Int_t AliITSClusterFinderSDD::SearchPeak(Double_t *spect,Int_t xdim,Int_t zdim,
 337                                          Int_t *peakX, Int_t *peakZ,
 338                                          Double_t *peakAmp, Double_t minpeak ){
 339     // search peaks on a 2D cluster
 340     Int_t npeak = 0;    // # peaks
 341     Int_t i,j;
 342     // search peaks
 343     for( Int_t z=1; z<zdim-1; z++ ){
 344         for( Int_t x=1; x<xdim-2; x++ ){
 345             Double_t sxz = spect[x*zdim+z];
 346             Double_t sxz1 = spect[(x+1)*zdim+z];
 347             Double_t sxz2 = spect[(x-1)*zdim+z];
 348             // search a local max. in s[x,z]
 349             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 350             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 351                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 352                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 353                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 354                 // peak found
 355                 peakX[npeak] = x;
 356                 peakZ[npeak] = z;
 357                 peakAmp[npeak] = sxz;
 358                 npeak++;
 359             } // end if ....
 360         } // end for x
 361     } // end for z
 362     // search groups of peaks with same amplitude.
 363     Int_t *flag = new Int_t[npeak];
 364     for( i=0; i<npeak; i++ ) flag[i] = 0;
 365     for( i=0; i<npeak; i++ ){
 366         for( j=0; j<npeak; j++ ){
 367             if( i==j) continue;
 368             if( flag[j] > 0 ) continue;
 369             if( peakAmp[i] == peakAmp[j] &&
 370                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 371                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 372                 if( flag[i] == 0) flag[i] = i+1;
 373                 flag[j] = flag[i];
 374             } // end if ...
 375         } // end for j
 376     } // end for i
 377     // make average of peak groups
 378     for( i=0; i<npeak; i++ ){
 379         Int_t nFlag = 1;
 380         if( flag[i] <= 0 ) continue;
 381         for( j=0; j<npeak; j++ ){
 382             if( i==j ) continue;
 383             if( flag[j] != flag[i] ) continue;
 384             peakX[i] += peakX[j];
 385             peakZ[i] += peakZ[j];
 386             nFlag++;
 387             npeak--;
 388             for( Int_t k=j; k<npeak; k++ ){
 389                 peakX[k] = peakX[k+1];
 390                 peakZ[k] = peakZ[k+1];
 391                 peakAmp[k] = peakAmp[k+1];
 392                 flag[k] = flag[k+1];
 393             } // end for k
 394             j--;
 395         } // end for j
 396         if( nFlag > 1 ){
 397             peakX[i] /= nFlag;
 398             peakZ[i] /= nFlag;
 399         } // end fi nFlag
 400     } // end for i
 401     delete [] flag;
 402     return( npeak );
 403 }
 404 //______________________________________________________________________
 405 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Double_t *par,
 406                                        Double_t *spe, Double_t *integral){
 407     // function used to fit the clusters
 408     // par -> parameters..
 409     // par[0]  number of peaks.
 410     // for each peak i=1, ..., par[0]
 411     //                 par[i] = Ampl.
 412     //                 par[i+1] = xpos
 413     //                 par[i+2] = zpos
 414     //                 par[i+3] = tau
 415     //                 par[i+4] = sigma.
 416     Int_t electronics = GetResp(fModule)->GetElectronics(); // 1 = PASCAL, 2 = OLA
 417     const Int_t knParam = 5;
 418     Int_t npeak = (Int_t)par[0];
 419
 420     memset( spe, 0, sizeof( Double_t )*zdim*xdim );
 421
 422     Int_t k = 1;
 423     for( Int_t i=0; i<npeak; i++ ){
 424         if( integral != 0 ) integral[i] = 0.;
 425         Double_t sigmaA2 = par[k+4]*par[k+4]*2.;
 426         Double_t t2 = par[k+3];   // PASCAL
 427         if( electronics == 2 ) { t2 *= t2; t2 *= 2; } // OLA
 428         for( Int_t z=0; z<zdim; z++ ){
 429             for( Int_t x=0; x<xdim; x++ ){
 430                 Double_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 431                 Double_t x2 = 0.;
 432                 Double_t signal = 0.;
 433                 if( electronics == 1 ){ // PASCAL
 434                     x2 = (x-par[k+1]+t2)/t2;
 435                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 436                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 437                 }else if( electronics == 2 ) { // OLA
 438                     x2 = (x-par[k+1])*(x-par[k+1])/t2;
 439                     signal = par[k]  * exp( -x2 - z2 );
 440                 } else {
 441                     Warning("PeakFunc","Wrong SDD Electronics = %d",
 442                             electronics);
 443                     // exit( 1 );
 444                 } // end if electronicx
 445                 spe[x*zdim+z] += signal;
 446                 if( integral != 0 ) integral[i] += signal;
 447             } // end for x
 448         } // end for z
 449         k += knParam;
 450     } // end for i
 451     return;
 452 }
 453 //__________________________________________________________________________
 454 Double_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Double_t *spe,
 455                                         Double_t *speFit ) const{
 456     // EVALUATES UNNORMALIZED CHI-SQUARED
 457     Double_t chi2 = 0.;
 458     for( Int_t z=0; z<zdim; z++ ){
 459         for( Int_t x=1; x<xdim-1; x++ ){
 460             Int_t index = x*zdim+z;
 461             Double_t tmp = spe[index] - speFit[index];
 462             chi2 += tmp*tmp;
 463         } // end for x
 464     } // end for z
 465     return( chi2 );
 466 }
 467 //_______________________________________________________________________
 468 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Double_t *param,
 469                                     Double_t *prm0,Double_t *steprm,
 470                                     Double_t *chisqr,Double_t *spe,
 471                                     Double_t *speFit ){
 472     //
 473     Int_t   k, nnn, mmm, i;
 474     Double_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 475     const Int_t knParam = 5;
 476     Int_t npeak = (Int_t)param[0];
 477     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 478     for( k=1; k<(npeak*knParam+1); k++ ){
 479         p1 = param[k];
 480         delta = steprm[k];
 481         d1 = delta;
 482         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 483         if( TMath::Abs( p1 ) > 1.0E-6 )
 484             if ( TMath::Abs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 485             else  delta = (Double_t)1.0E-4;
 486         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 487         PeakFunc( xdim, zdim, param, speFit );
 488         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 489         p2 = p1+delta;
 490         param[k] = p2;
 491         PeakFunc( xdim, zdim, param, speFit );
 492         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 493         if( chisq1 < chisq2 ){
 494             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 495             delta = -delta;
 496             t = p1;
 497             p1 = p2;
 498             p2 = t;
 499             t = chisq1;
 500             chisq1 = chisq2;
 501             chisq2 = t;
 502         } // end if
 503         i = 1; nnn = 0;
 504         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 505             nnn++;
 506             p3 = p2 + delta;
 507             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 508             if( mmm == 0 ){
 509                 d1 = delta;
 510                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 511                 delta *= 5;
 512             } // end if
 513             param[k] = p3;
 514             // Constrain paramiters
 515             Int_t kpos = (k-1) % knParam;
 516             switch( kpos ){
 517             case 0 :
 518                 if( param[k] <= 20 ) param[k] = fMinPeak;
 519                 break;
 520             case 1 :
 521                 if( TMath::Abs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 522                 break;
 523             case 2 :
 524                 if( TMath::Abs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 525                 break;
 526             case 3 :
 527                 if( param[k] < .5 ) param[k] = .5;
 528                 break;
 529             case 4 :
 530                 if( param[k] < .288 ) param[k] = .288;// 1/sqrt(12) = 0.288
 531                 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 532                 break;
 533             }; // end switch
 534             PeakFunc( xdim, zdim, param, speFit );
 535             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 536             if( chisq3 < chisq2 && nnn < 50 ){
 537                 p1 = p2;
 538                 p2 = p3;
 539                 chisq1 = chisq2;
 540                 chisq2 = chisq3;
 541             }else i=0;
 542         } while( i );
 543         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 544         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 545         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 546         if( a!=0 ) p0 = (Double_t)(0.5*b/a);
 547         else p0 = 10000;
 548         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 549         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 550         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 551         //dp = (Double_t) max (TMath::Abs(p3-p2), TMath::Abs(p2-p1));
 552         //if( TMath::Abs( p2-p0 ) > dp ) p0 = p2;
 553         param[k] = p0;
 554         // Constrain paramiters
 555         Int_t kpos = (k-1) % knParam;
 556         switch( kpos ){
 557         case 0 :
 558             if( param[k] <= 20 ) param[k] = fMinPeak;
 559             break;
 560         case 1 :
 561             if( TMath::Abs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 562             break;
 563         case 2 :
 564             if( TMath::Abs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 565             break;
 566         case 3 :
 567             if( param[k] < .5 ) param[k] = .5;
 568             break;
 569         case 4 :
 570             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 571             if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 572             break;
 573         }; // end switch
 574         PeakFunc( xdim, zdim, param, speFit );
 575         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 576         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 577         if( chisqt <= *chisqr ) *chisqr = chisqt;
 578         else param[k] = prm0[k];
 579         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 580         steprm[k] = (param[k]-prm0[k])/5;
 581         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 582     } // end for k
 583     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 584     PeakFunc( xdim, zdim, param, speFit );
 585     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 586     return;
 587 }
 588 //_________________________________________________________________________
 589 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 590                                            Double_t *param, Double_t *spe,
 591                                            Int_t *niter, Double_t *chir ){
 592     // fit method from Comput. Phys. Commun 46(1987) 149
 593     const Double_t kchilmt = 0.01;  //        relative accuracy
 594     const Int_t   knel = 3;        //        for parabolic minimization
 595     const Int_t   knstop = 50;     //        Max. iteration number
 596     const Int_t   knParam = 5;
 597     Int_t npeak = (Int_t)param[0];
 598     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 599     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 600     Double_t degFree = (xdim*zdim - npeak*knParam)-1;
 601     Int_t   n, k, iterNum = 0;
 602     Double_t *prm0 = new Double_t[npeak*knParam+1];
 603     Double_t *step = new Double_t[npeak*knParam+1];
 604     Double_t *schi = new Double_t[npeak*knParam+1];
 605     Double_t *sprm[3];
 606     sprm[0] = new Double_t[npeak*knParam+1];
 607     sprm[1] = new Double_t[npeak*knParam+1];
 608     sprm[2] = new Double_t[npeak*knParam+1];
 609     Double_t  chi0, chi1, reldif, a, b, prmin, dp;
 610     Double_t *speFit = new Double_t[ xdim*zdim ];
 611     PeakFunc( xdim, zdim, param, speFit );
 612     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 613     chi1 = chi0;
 614     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 615         for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 616             step[k] = param[k] / 20.0 ;
 617             step[k+1] = param[k+1] / 50.0;
 618             step[k+2] = param[k+2] / 50.0;
 619             step[k+3] = param[k+3] / 20.0;
 620             step[k+4] = param[k+4] / 20.0;
 621         } // end for k
 622     Int_t out = 0;
 623     do{
 624         iterNum++;
 625             chi0 = chi1;
 626             Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 627             reldif = ( chi1 > 0 ) ? ((Double_t) TMath::Abs( chi1-chi0)/chi1 ) : 0;
 628         // EXIT conditions
 629         if( reldif < (float) kchilmt ){
 630             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 631             *niter = iterNum;
 632             out = 0;
 633             break;
 634         } // end if
 635         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 636             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 637             *niter = iterNum;
 638             out = 0;
 639             break;
 640         } // end if
 641         if( iterNum > 5*knstop ){
 642             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 643             *niter = iterNum;
 644             out = 1;
 645             break;
 646         } // end if
 647         if( iterNum <= knel ) continue;
 648         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 649         if( n > 3 || n == 0 ) continue;
 650         schi[n-1] = chi1;
 651         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 652         if( n != 3 ) continue;
 653         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 654         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 655         for( k=1; k<(npeak*knParam+1); k++ ){
 656             Double_t tmp0 = sprm[0][k];
 657             Double_t tmp1 = sprm[1][k];
 658             Double_t tmp2 = sprm[2][k];
 659             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 660             a += (schi[2]*(tmp0-tmp1));
 661             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 662             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 663                                              (tmp0*tmp0-tmp1*tmp1)));
 664             if ((double)a < 1.0E-6) prmin = 0;
 665             else prmin = (float) (0.5*b/a);
 666             dp = 5*(tmp2-tmp0);
 667             if( TMath::Abs(prmin-tmp2) > TMath::Abs(dp) ) prmin = tmp2+dp;
 668             param[k] = prmin;
 669             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 670         } // end for k
 671     } while( kTRUE );
 672     delete [] prm0;
 673     delete [] step;
 674     delete [] schi;
 675     delete [] sprm[0];
 676     delete [] sprm[1];
 677     delete [] sprm[2];
 678     delete [] speFit;
 679     return( out );
 680 }
 681
 682 //______________________________________________________________________
 683 void AliITSClusterFinderSDD::ResolveClusters(){
 684     // The function to resolve clusters if the clusters overlapping exists
 685     Int_t i;
 686     // get number of clusters for this module
 687     Int_t nofClusters = NClusters();
 688     nofClusters -= fNclusters;
 689     Int_t fNofMaps = GetSeg()->Npz();
 690     Int_t fNofAnodes = fNofMaps/2;
 691     //Int_t fMaxNofSamples = GetSeg()->Npx();
 692     Int_t dummy=0;
 693     Double_t fTimeStep = GetSeg()->Dpx( dummy );
 694     Double_t fSddLength = GetSeg()->Dx();
 695     Double_t anodePitch = GetSeg()->Dpz( dummy );
 696     //Double_t n, baseline;
 697     //GetResp(fModule)->GetNoiseParam( n, baseline );
 698     Int_t electronics =GetResp(fModule)->GetElectronics(); // 1 = PASCAL, 2 = OLA
 699     AliITSCalibrationSDD* cal = (AliITSCalibrationSDD*)GetResp(fModule);
 700
 701
 702     for( Int_t j=0; j<nofClusters; j++ ){
 703         // get cluster information
 704         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) Cluster(j);
 705         Int_t astart = clusterJ->Astart();
 706         Int_t astop = clusterJ->Astop();
 707         Int_t tstart = clusterJ->Tstartf();
 708         Int_t tstop = clusterJ->Tstopf();
 709         Int_t wing = (Int_t)clusterJ->W();
 710         if( wing == 2 ){
 711             astart += fNofAnodes;
 712             astop  += fNofAnodes;
 713         } // end if
 714         Int_t xdim = tstop-tstart+3;
 715         Int_t zdim = astop-astart+3;
 716         if( xdim > 50 || zdim > 30 ) {
 717             Warning("ResolveClusters","xdim: %d , zdim: %d ",xdim,zdim);
 718             continue;
 719         }
 720         Double_t *sp = new Double_t[ xdim*zdim+1 ];
 721         memset( sp, 0, sizeof(Double_t)*(xdim*zdim+1) );
 722
 723         // make a local map from cluster region
 724         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 725             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 726                 Double_t fadc = Map()->GetSignal( ianode, itime );
 727                 Double_t baseline=GetResp(fModule)->GetBaseline(ianode);
 728                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 729                 else fadc = 0.;
 730                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 731                 sp[index] = fadc;
 732             } // time loop
 733         } // anode loop
 734
 735         // search peaks on cluster
 736         const Int_t kNp = 150;
 737         Int_t peakX1[kNp];
 738         Int_t peakZ1[kNp];
 739         Double_t peakAmp1[kNp];
 740         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 741
 742         // if multiple peaks, split cluster
 743         if( npeak >= 1 ){
 744             //        cout << "npeak " << npeak << endl;
 745             //        clusterJ->PrintInfo();
 746             Double_t *par = new Double_t[npeak*5+1];
 747             par[0] = (Double_t)npeak;
 748             // Initial parameters in cell dimentions
 749             Int_t k1 = 1;
 750             for( i=0; i<npeak; i++ ){
 751                 par[k1] = peakAmp1[i];
 752                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 753                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 754                 if( electronics == 1 ) par[k1+3] = 2.; // PASCAL
 755                 else if(electronics==2) par[k1+3] = 0.7;//tau [timebin] OLA
 756                 par[k1+4] = .4;    // sigma        [anodepich]
 757                 k1 += 5;
 758             } // end for i
 759             Int_t niter;
 760             Double_t chir;
 761             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 762             Double_t peakX[kNp];
 763             Double_t peakZ[kNp];
 764             Double_t sigma[kNp];
 765             Double_t tau[kNp];
 766             Double_t peakAmp[kNp];
 767             Double_t integral[kNp];
 768             //get integrals => charge for each peak
 769             PeakFunc( xdim, zdim, par, sp, integral );
 770             k1 = 1;
 771             for( i=0; i<npeak; i++ ){
 772                 peakAmp[i] = par[k1];
 773                 peakX[i]   = par[k1+1];
 774                 peakZ[i]   = par[k1+2];
 775                 tau[i]     = par[k1+3];
 776                 sigma[i]   = par[k1+4];
 777                 k1+=5;
 778             } // end for i
 779             // calculate parameter for new clusters
 780             for( i=0; i<npeak; i++ ){
 781                 AliITSRawClusterSDD clusterI( *clusterJ );
 782
 783                 Int_t newAnode = peakZ1[i]-1 + astart;
 784
 785             //    Int_t newiTime = peakX1[i]-1 + tstart;
 786             //    Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 787             //    if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )
 788             //        shift = 0;
 789             //    Int_t peakpos = Map()->GetHitIndex(newAnode,newiTime+shift );
 790             //    clusterI.SetPeakPos( peakpos );
 791
 792                 clusterI.SetPeakAmpl( peakAmp1[i] );
 793                 Double_t newAnodef = peakZ[i] - 0.5 + astart;
 794                 Double_t newiTimef = peakX[i] - 1 + tstart;
 795                 if( wing == 2 ) newAnodef -= fNofAnodes;
 796                 Double_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 797                 newiTimef *= fTimeStep;
 798                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 799                 if( electronics == 1 ){
 800                 //    newiTimef *= 0.999438;    // PASCAL
 801                 //    newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 802                 }else if( electronics == 2 )
 803                     newiTimef *= 0.99714;    // OLA
 804
 805                 Int_t timeBin = (Int_t)(newiTimef/fTimeStep+0.5);
 806                 Int_t peakpos = Map()->GetHitIndex( newAnode, timeBin );
 807                 if( peakpos < 0 ) {
 808                     for( Int_t ii=0; ii<3; ii++ ) {
 809                         peakpos = Map()->GetHitIndex( newAnode, timeBin+ii );
 810                         if( peakpos > 0 ) break;
 811                         peakpos = Map()->GetHitIndex( newAnode, timeBin-ii );
 812                         if( peakpos > 0 ) break;
 813                     }
 814                 }
 815
 816                 if( peakpos < 0 ) {
 817                     //Warning("ResolveClusters",
 818                     //        "Digit not found for cluster");
 819                     //if(AliDebugLevel()>=3) clusterI.PrintInfo();
 820                    continue;
 821                 }
 822                 clusterI.SetPeakPos( peakpos );
 823                 Float_t dp = cal->GetDriftPath(newiTimef,anodePath);
 824                 Double_t driftPath = fSddLength - (Double_t)dp;
 825                 Double_t sign = ( wing == 1 ) ? -1. : 1.;
 826                 Double_t xcoord = driftPath*sign * 0.0001;
 827                 Double_t zcoord = anodePath * 0.0001;
 828                 CorrectPosition(zcoord,xcoord);
 829                 clusterI.SetX( xcoord );
 830                 clusterI.SetZ( zcoord );
 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
 837                 fDetTypeRec->AddCluster( 1, &clusterI );
 838             } // end for i
 839             Clusters()->RemoveAt( j );
 840             delete [] par;
 841         } else {  // something odd
 842             Warning( "ResolveClusters",
 843                      "--- Peak not found!!!!  minpeak=%d ,cluster peak= %f"
 844                      " , module= %d",
 845                      fMinPeak, clusterJ->PeakAmpl(),GetModule());
 846             clusterJ->PrintInfo();
 847             Warning( "ResolveClusters"," xdim= %d zdim= %d", xdim-2, zdim-2 );
 848         }
 849         delete [] sp;
 850     } // cluster loop
 851     Clusters()->Compress();
 852 //    Map()->ClearMap();
 853 }
 854 //________________________________________________________________________
 855 void  AliITSClusterFinderSDD::GroupClusters(){
 856     // group clusters
 857     Int_t dummy=0;
 858     Double_t fTimeStep = GetSeg()->Dpx(dummy);
 859     // get number of clusters for this module
 860     Int_t nofClusters = NClusters();
 861     nofClusters -= fNclusters;
 862     AliITSRawClusterSDD *clusterI;
 863     AliITSRawClusterSDD *clusterJ;
 864     Int_t *label = new Int_t [nofClusters];
 865     Int_t i,j;
 866     for(i=0; i<nofClusters; i++) label[i] = 0;
 867     for(i=0; i<nofClusters; i++) {
 868         if(label[i] != 0) continue;
 869         for(j=i+1; j<nofClusters; j++) {
 870             if(label[j] != 0) continue;
 871             clusterI = (AliITSRawClusterSDD*) Cluster(i);
 872             clusterJ = (AliITSRawClusterSDD*) Cluster(j);
 873             // 1.3 good
 874             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 875             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 876             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 877             if(!pair) continue;
 878             if(AliDebugLevel()>=4){
 879                 clusterI->PrintInfo();
 880                 clusterJ->PrintInfo();
 881             } // end if AliDebugLevel
 882             clusterI->Add(clusterJ);
 883             label[j] = 1;
 884             Clusters()->RemoveAt(j);
 885             j=i; // <- Ernesto
 886         } // J clusters
 887         label[i] = 1;
 888     } // I clusters
 889     Clusters()->Compress();
 890
 891     delete [] label;
 892     return;
 893 }
 894 //________________________________________________________________________
 895 void AliITSClusterFinderSDD::SelectClusters(){
 896     // get number of clusters for this module
 897     Int_t nofClusters = NClusters();
 898
 899     nofClusters -= fNclusters;
 900     Int_t i;
 901     for(i=0; i<nofClusters; i++) {
 902         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) Cluster(i);
 903         Int_t rmflg = 0;
 904         Double_t wy = 0.;
 905         if(clusterI->Anodes() != 0.) {
 906             wy = ((Double_t) clusterI->Samples())/clusterI->Anodes();
 907         } // end if
 908         Int_t amp = (Int_t) clusterI->PeakAmpl();
 909         Int_t cha = (Int_t) clusterI->Q();
 910         if(amp < fMinPeak) rmflg = 1;
 911         if(cha < fMinCharge) rmflg = 1;
 912         if(wy < fMinNCells) rmflg = 1;
 913         //if(wy > fMaxNCells) rmflg = 1;
 914         if(rmflg) Clusters()->RemoveAt(i);
 915     } // I clusters
 916     Clusters()->Compress();
 917     return;
 918 }
 919
 920 //______________________________________________________________________
 921 void AliITSClusterFinderSDD::GetRecPoints(){
 922     // get rec points
 923
 924     // get number of clusters for this module
 925     Int_t nofClusters = NClusters();
 926     nofClusters -= fNclusters;
 927     const Double_t kconvGeV = 1.e-6; // GeV -> KeV
 928     const Double_t kconv = 1.0e-4;
 929     const Double_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
 930     const Double_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
 931     Int_t i;
 932     Int_t ix, iz, idx=-1;
 933     AliITSdigitSDD *dig=0;
 934     Int_t ndigits=NDigits();
 935
 936     Int_t lay,lad,det;
 937     fDetTypeRec->GetITSgeom()->GetModuleId(fModule,lay,lad,det);
 938     Int_t ind=(lad-1)*fDetTypeRec->GetITSgeom()->GetNdetectors(lay)+(det-1);
 939     Int_t lyr=(lay-1);
 940
 941
 942     for(i=0; i<nofClusters; i++) {
 943         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)Cluster(i);
 944         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
 945         if(clusterI) idx=clusterI->PeakPos();
 946         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
 947         // try peak neighbours - to be done
 948         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)GetDigit(idx);
 949         if(!dig) {
 950             // try cog
 951             GetSeg()->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
 952             dig = (AliITSdigitSDD*)Map()->GetHit(iz-1,ix-1);
 953             // if null try neighbours
 954             if (!dig) dig = (AliITSdigitSDD*)Map()->GetHit(iz-1,ix);
 955             if (!dig) dig = (AliITSdigitSDD*)Map()->GetHit(iz-1,ix+1);
 956             if (!dig) printf("SDD: cannot assign the track number!\n");
 957         } //  end if !dig
 958
 959         Int_t lab[4] = {-3141593,-3141593,-3141593,ind};
 960         if (dig) {
 961           lab[0] = dig->GetTrack(0);
 962           lab[1] = dig->GetTrack(1);
 963           lab[2] = dig->GetTrack(2);
 964         }
 965         Float_t hit[5] = {clusterI->X(),clusterI->Z(),kRMSx*kRMSx,kRMSz*kRMSz,clusterI->Q()};
 966         Int_t info[3] = {0,0,lyr};
 967
 968         AliITSRecPoint rnew(lab,hit,info,kTRUE);
 969         rnew.SetdEdX(kconvGeV*clusterI->Q());
 970
 971         fDetTypeRec->AddRecPoint(rnew);
 972     } // I clusters
 973 //    Map()->ClearMap();
 974 }
 975 //______________________________________________________________________
 976 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
 977     // find raw clusters
 978
 979     SetModule(mod);
 980     SetCutAmplitude(mod);
 981     Int_t nanodes=GetSeg()->Npz();
 982     Int_t noise=0;
 983     for(Int_t i=0;i<nanodes;i++){
 984       noise+=(Int_t)(((AliITSCalibrationSDD*)GetResp(mod))->GetNoiseAfterElectronics(i));
 985     }
 986     SetMinPeak((noise/nanodes)*5);
 987     Find1DClustersE();
 988     GroupClusters();
 989     SelectClusters();
 990     ResolveClusters();
 991     GetRecPoints();
 992 }
 993 //_______________________________________________________________________
 994 void AliITSClusterFinderSDD::PrintStatus() const{
 995     // Print SDD cluster finder Parameters
 996
 997     cout << "**************************************************" << endl;
 998     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
 999     cout << "**************************************************" << endl;
1000     cout << "Number of Clusters: " << fNclusters << endl;
1001     cout << "Anode Tolerance: " << fDAnode << endl;
1002     cout << "Time  Tolerance: " << fDTime << endl;
1003     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1004     cout << "Cut Amplitude (threshold): " << fCutAmplitude[0] << endl;
1005     cout << "Minimum Amplitude: " << fMinPeak << endl;
1006     cout << "Minimum Charge: " << fMinCharge << endl;
1007     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1008     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1009     cout << "**************************************************" << endl;
1010 }
1011
1012 //_________________________________________________________________________
1013 void AliITSClusterFinderSDD::CorrectPosition(Double_t &z, Double_t&y){
1014   //correction of coordinates using the maps stored in the DB
1015
1016   AliITSCalibrationSDD* cal = (AliITSCalibrationSDD*)GetResp(fModule);
1017   static const Int_t nbint = cal->GetMapTimeNBin();
1018   static const Int_t nbina = cal->Chips()*cal->Channels();
1019   Float_t stepa = (GetSeg()->Dpz(0))/10000.; //anode pitch in cm
1020   Float_t stept = (GetSeg()->Dx()/cal->GetMapTimeNBin()/2.)/10.;
1021
1022   Int_t bint = TMath::Abs((Int_t)(y/stept));
1023   if(y>=0) bint+=(Int_t)(nbint/2.);
1024   if(bint>nbint) AliError("Wrong bin number!");
1025
1026   Int_t bina = TMath::Abs((Int_t)(z/stepa));
1027   if(z>=0) bina+=(Int_t)(nbina/2.);
1028   if(bina>nbina) AliError("Wrong bin number!");
1029
1030   Double_t devz = (Double_t)cal->GetMapACell(bina,bint)/10000.;
1031   Double_t devx = (Double_t)cal->GetMapTCell(bina,bint)/10000.;
1032   z+=devz;
1033   y+=devx;
1034
1035 }