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 #include <iostream.h>
  16 #include <TFile.h>
  17 #include <TMath.h>
  18 #include <math.h>
  19
  20 #include "AliITSClusterFinderSDD.h"
  21 #include "AliITSMapA1.h"
  22 #include "AliITS.h"
  23 #include "AliITSdigit.h"
  24 #include "AliITSRawCluster.h"
  25 #include "AliITSRecPoint.h"
  26 #include "AliITSsegmentation.h"
  27 #include "AliITSresponseSDD.h"
  28 #include "AliRun.h"
  29
  30 ClassImp(AliITSClusterFinderSDD)
  31
  32 //______________________________________________________________________
  33 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSsegmentation *seg,
  34                                                AliITSresponse *response,
  35                                                TClonesArray *digits,
  36                                                TClonesArray *recp){
  37     // standard constructor
  38
  39     fSegmentation = seg;
  40     fResponse     = response;
  41     fDigits       = digits;
  42     fClusters     = recp;
  43     fNclusters    = fClusters->GetEntriesFast();
  44     SetCutAmplitude();
  45     SetDAnode();
  46     SetDTime();
  47     SetMinPeak();
  48     SetMinNCells();
  49     SetMaxNCells();
  50     SetTimeCorr();
  51     SetMinCharge();
  52     fMap = new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
  53 }
  54 //______________________________________________________________________
  55 AliITSClusterFinderSDD::AliITSClusterFinderSDD(){
  56     // default constructor
  57
  58     fSegmentation = 0;
  59     fResponse     = 0;
  60     fDigits       = 0;
  61     fClusters     = 0;
  62     fNclusters    = 0;
  63     fMap          = 0;
  64     fCutAmplitude = 0;
  65     SetDAnode();
  66     SetDTime();
  67     SetMinPeak();
  68     SetMinNCells();
  69     SetMaxNCells();
  70     SetTimeCorr();
  71     SetMinCharge();
  72 }
  73 //____________________________________________________________________________
  74 AliITSClusterFinderSDD::~AliITSClusterFinderSDD(){
  75     // destructor
  76
  77     if(fMap) delete fMap;
  78 }
  79 //______________________________________________________________________
  80 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma){
  81     // set the signal threshold for cluster finder
  82     Float_t baseline,noise,noise_after_el;
  83
  84     fResponse->GetNoiseParam(noise,baseline);
  85     noise_after_el = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
  86     fCutAmplitude = (Int_t)((baseline + nsigma*noise_after_el));
  87 }
  88 //______________________________________________________________________
  89 void AliITSClusterFinderSDD::Find1DClusters(){
  90     // find 1D clusters
  91     static AliITS *iTS = (AliITS*)gAlice->GetModule("ITS");
  92
  93     // retrieve the parameters
  94     Int_t fNofMaps       = fSegmentation->Npz();
  95     Int_t fMaxNofSamples = fSegmentation->Npx();
  96     Int_t fNofAnodes     = fNofMaps/2;
  97     Int_t dummy          = 0;
  98     Float_t fTimeStep    = fSegmentation->Dpx(dummy);
  99     Float_t fSddLength   = fSegmentation->Dx();
 100     Float_t fDriftSpeed  = fResponse->DriftSpeed();
 101     Float_t anodePitch   = fSegmentation->Dpz(dummy);
 102
 103     // map the signal
 104     fMap->SetThreshold(fCutAmplitude);
 105     fMap->FillMap();
 106
 107     Float_t noise;
 108     Float_t baseline;
 109     fResponse->GetNoiseParam(noise,baseline);
 110
 111     Int_t nofFoundClusters = 0;
 112     Int_t i;
 113     Float_t **dfadc = new Float_t*[fNofAnodes];
 114     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 115     Float_t fadc  = 0.;
 116     Float_t fadc1 = 0.;
 117     Float_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=(Float_t)fMap->GetSignal(idx,l);
 126                 if(l>0) fadc1=(Float_t)fMap->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         //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 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                 Float_t fadcmax  = 0.;
 142                 Float_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)fMap->GetSignal(idx,id);
 151                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 152                     if(fadc > (float)fCutAmplitude) {
 153                         lthrt++;
 154                     } // end if
 155                     if(dfadc[k][id] > dfadcmax) {
 156                         dfadcmax = dfadc[k][id];
 157                         imaxd    = id;
 158                     } // end if
 159                 } // end for m
 160                 it = imaxd;
 161                 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 162                 // cluster charge
 163                 Int_t tstart = it-2;
 164                 if(tstart < 0) tstart = 0;
 165                 Bool_t ilcl = 0;
 166                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 167                 if(ilcl) {
 168                     nofFoundClusters++;
 169                     Int_t tstop      = tstart;
 170                     Float_t dfadcmin = 10000.;
 171                     Int_t ij;
 172                     for(ij=0; ij<20; ij++) {
 173                         if(tstart+ij > 255) { tstop = 255; break; }
 174                         fadc=(float)fMap->GetSignal(idx,tstart+ij);
 175                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 176                            (fadc > fCutAmplitude)) {
 177                             tstop = tstart+ij+5;
 178                             if(tstop > 255) tstop = 255;
 179                             dfadcmin = dfadc[k][it+ij];
 180                         } // end if
 181                     } // end for ij
 182
 183                     Float_t clusterCharge = 0.;
 184                     Float_t clusterAnode  = k+0.5;
 185                     Float_t clusterTime   = 0.;
 186                     Int_t   clusterMult   = 0;
 187                     Float_t clusterPeakAmplitude = 0.;
 188                     Int_t its,peakpos     = -1;
 189                     Float_t n, baseline;
 190                     fResponse->GetNoiseParam(n,baseline);
 191                     for(its=tstart; its<=tstop; its++) {
 192                         fadc=(float)fMap->GetSignal(idx,its);
 193                         if(fadc>baseline) fadc -= baseline;
 194                         else fadc = 0.;
 195                         clusterCharge += fadc;
 196                         // as a matter of fact we should take the peak
 197                         // pos before FFT
 198                         // to get the list of tracks !!!
 199                         if(fadc > clusterPeakAmplitude) {
 200                             clusterPeakAmplitude = fadc;
 201                             //peakpos=fMap->GetHitIndex(idx,its);
 202                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 203                             if(its>shift && its<(fMaxNofSamples-shift))
 204                                 peakpos  = fMap->GetHitIndex(idx,its+shift);
 205                             else peakpos = fMap->GetHitIndex(idx,its);
 206                             if(peakpos<0) peakpos =fMap->GetHitIndex(idx,its);
 207                         } // end if
 208                         clusterTime += fadc*its;
 209                         if(fadc > 0) clusterMult++;
 210                         if(its == tstop) {
 211                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 212                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 213                             //ns
 214                         } // end if
 215                     } // end for its
 216
 217                     Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 218                                                anodePitch;
 219                     Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 220                     clusterDriftPath = fSddLength-clusterDriftPath;
 221                     if(clusterCharge <= 0.) break;
 222                     AliITSRawClusterSDD clust(j+1,//i
 223                                               clusterAnode,clusterTime,//ff
 224                                               clusterCharge, //f
 225                                               clusterPeakAmplitude, //f
 226                                               peakpos, //i
 227                                               0.,0.,clusterDriftPath,//fff
 228                                               clusteranodePath, //f
 229                                               clusterMult, //i
 230                                               0,0,0,0,0,0,0);//7*i
 231                     iTS->AddCluster(1,&clust);
 232                     it = tstop;
 233                 } // ilcl
 234                 it++;
 235             } // while (samples)
 236         } // anodes
 237     } // detectors (2)
 238     //fMap->ClearMap();
 239
 240     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 241     delete [] dfadc;
 242
 243     return;
 244 }
 245 //______________________________________________________________________
 246 void AliITSClusterFinderSDD::Find1DClustersE(){
 247     // find 1D clusters
 248     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 249     // retrieve the parameters
 250     Int_t fNofMaps = fSegmentation->Npz();
 251     Int_t fMaxNofSamples = fSegmentation->Npx();
 252     Int_t fNofAnodes = fNofMaps/2;
 253     Int_t dummy=0;
 254     Float_t fTimeStep = fSegmentation->Dpx( dummy );
 255     Float_t fSddLength = fSegmentation->Dx();
 256     Float_t fDriftSpeed = fResponse->DriftSpeed();
 257     Float_t anodePitch = fSegmentation->Dpz( dummy );
 258     Float_t n, baseline;
 259     fResponse->GetNoiseParam( n, baseline );
 260     // map the signal
 261     fMap->SetThreshold( fCutAmplitude );
 262     fMap->FillMap();
 263     Int_t nClu = 0;
 264     //  cout << "Search  cluster... "<< endl;
 265     for( Int_t j=0; j<2; j++ ){
 266         for( Int_t k=0; k<fNofAnodes; k++ ){
 267             Int_t idx = j*fNofAnodes+k;
 268             Bool_t on = kFALSE;
 269             Int_t start = 0;
 270             Int_t nTsteps = 0;
 271             Float_t fmax = 0.;
 272             Int_t lmax = 0;
 273             Float_t charge = 0.;
 274             Float_t time = 0.;
 275             Float_t anode = k+0.5;
 276             Int_t peakpos = -1;
 277             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 278                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 279                 if( fadc > 0.0 ){
 280                     if( on == kFALSE && l<fMaxNofSamples-4){
 281                         // star RawCluster (reset var.)
 282                         Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 283                         if( fadc1 < fadc ) continue;
 284                         start = l;
 285                         fmax = 0.;
 286                         lmax = 0;
 287                         time = 0.;
 288                         charge = 0.;
 289                         on = kTRUE;
 290                         nTsteps = 0;
 291                     } // end if on...
 292                     nTsteps++ ;
 293                     if( fadc > baseline ) fadc -= baseline;
 294                     else fadc=0.;
 295                     charge += fadc;
 296                     time += fadc*l;
 297                     if( fadc > fmax ){
 298                         fmax = fadc;
 299                         lmax = l;
 300                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 301                         if( l > shift && l < (fMaxNofSamples-shift) )
 302                             peakpos = fMap->GetHitIndex( idx, l+shift );
 303                         else
 304                             peakpos = fMap->GetHitIndex( idx, l );
 305                         if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
 306                     } // end if fadc
 307                 }else{ // end fadc>0
 308                     if( on == kTRUE ){
 309                         if( nTsteps > 2 ){
 310                             //  min # of timesteps for a RawCluster
 311                             // Found a RawCluster...
 312                             Int_t stop = l-1;
 313                             time /= (charge/fTimeStep);   // ns
 314                                 // time = lmax*fTimeStep;   // ns
 315                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 316                             Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 317                             Float_t driftPath = time*fDriftSpeed;
 318                             driftPath = fSddLength-driftPath;
 319                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 320                                                       fmax, peakpos,0.,0.,
 321                                                       driftPath,anodePath,
 322                                                       nTsteps,start,stop,
 323                                                       start, stop, 1, k, k );
 324                             iTS->AddCluster( 1, &clust );
 325                             //  clust.PrintInfo();
 326                             nClu++;
 327                         } // end if nTsteps
 328                         on = kFALSE;
 329                     } // end if on==kTRUE
 330                 } // end if fadc>0
 331             } // samples
 332         } // anodes
 333     } // wings
 334     //  cout << "# Rawclusters " << nClu << endl;
 335     return;
 336 }
 337 //_______________________________________________________________________
 338 Int_t AliITSClusterFinderSDD::SearchPeak(Float_t *spect,Int_t xdim,Int_t zdim,
 339                                          Int_t *peakX, Int_t *peakZ,
 340                                          Float_t *peakAmp, Float_t minpeak ){
 341     // search peaks on a 2D cluster
 342     Int_t npeak = 0;    // # peaks
 343     Int_t i,j;
 344     // search peaks
 345     for( Int_t z=1; z<zdim-1; z++ ){
 346         for( Int_t x=2; x<xdim-3; x++ ){
 347             Float_t sxz = spect[x*zdim+z];
 348             Float_t sxz1 = spect[(x+1)*zdim+z];
 349             Float_t sxz2 = spect[(x-1)*zdim+z];
 350             // search a local max. in s[x,z]
 351             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 352             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 353                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 354                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 355                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 356                 // peak found
 357                 peakX[npeak] = x;
 358                 peakZ[npeak] = z;
 359                 peakAmp[npeak] = sxz;
 360                 npeak++;
 361             } // end if ....
 362         } // end for x
 363     } // end for z
 364     // search groups of peaks with same amplitude.
 365     Int_t *flag = new Int_t[npeak];
 366     for( i=0; i<npeak; i++ ) flag[i] = 0;
 367     for( i=0; i<npeak; i++ ){
 368         for( j=0; j<npeak; j++ ){
 369             if( i==j) continue;
 370             if( flag[j] > 0 ) continue;
 371             if( peakAmp[i] == peakAmp[j] &&
 372                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 373                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 374                 if( flag[i] == 0) flag[i] = i+1;
 375                 flag[j] = flag[i];
 376             } // end if ...
 377         } // end for j
 378     } // end for i
 379     // make average of peak groups
 380     for( i=0; i<npeak; i++ ){
 381         Int_t nFlag = 1;
 382         if( flag[i] <= 0 ) continue;
 383         for( j=0; j<npeak; j++ ){
 384             if( i==j ) continue;
 385             if( flag[j] != flag[i] ) continue;
 386             peakX[i] += peakX[j];
 387             peakZ[i] += peakZ[j];
 388             nFlag++;
 389             npeak--;
 390             for( Int_t k=j; k<npeak; k++ ){
 391                 peakX[k] = peakX[k+1];
 392                 peakZ[k] = peakZ[k+1];
 393                 peakAmp[k] = peakAmp[k+1];
 394                 flag[k] = flag[k+1];
 395             } // end for k
 396             j--;
 397         } // end for j
 398         if( nFlag > 1 ){
 399             peakX[i] /= nFlag;
 400             peakZ[i] /= nFlag;
 401         } // end fi nFlag
 402     } // end for i
 403     delete [] flag;
 404     return( npeak );
 405 }
 406 //______________________________________________________________________
 407 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par,
 408                                        Float_t *spe, Float_t *integral){
 409     // function used to fit the clusters
 410     // par -> paramiters..
 411     // par[0]  number of peaks.
 412     // for each peak i=1, ..., par[0]
 413     //          par[i] = Ampl.
 414     //          par[i+1] = xpos
 415     //          par[i+2] = zpos
 416     //          par[i+3] = tau
 417     //          par[i+4] = sigma.
 418     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 419     const Int_t knParam = 5;
 420     Int_t npeak = (Int_t)par[0];
 421
 422     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 423
 424     Int_t k = 1;
 425     for( Int_t i=0; i<npeak; i++ ){
 426         if( integral != 0 ) integral[i] = 0.;
 427         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 428         Float_t T2 = par[k+3];   // PASCAL
 429         if( electronics == 2 ) { T2 *= T2; T2 *= 2; } // OLA
 430         for( Int_t z=0; z<zdim; z++ ){
 431             for( Int_t x=0; x<xdim; x++ ){
 432                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 433                 Float_t x2 = 0.;
 434                 Float_t signal = 0.;
 435                 if( electronics == 1 ){ // PASCAL
 436                     x2 = (x-par[k+1]+T2)/T2;
 437                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 438                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 439                 }else if( electronics == 2 ) { // OLA
 440                     x2 = (x-par[k+1])*(x-par[k+1])/T2;
 441                     signal = par[k]  * exp( -x2 - z2 );
 442                 } else {
 443                     cout << "Wrong SDD Electronics =" << electronics << endl;
 444                     // exit( 1 );
 445                 } // end if electronicx
 446                 spe[x*zdim+z] += signal;
 447                 if( integral != 0 ) integral[i] += signal;
 448             } // end for x
 449         } // end for z
 450         k += knParam;
 451     } // end for i
 452     return;
 453 }
 454 //__________________________________________________________________________
 455 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
 456                                         Float_t *speFit ){
 457     // EVALUATES UNNORMALIZED CHI-SQUARED
 458     Float_t chi2 = 0.;
 459     for( Int_t z=0; z<zdim; z++ ){
 460         for( Int_t x=1; x<xdim-1; x++ ){
 461             Int_t index = x*zdim+z;
 462             Float_t tmp = spe[index] - speFit[index];
 463             chi2 += tmp*tmp;
 464         } // end for x
 465     } // end for z
 466     return( chi2 );
 467 }
 468 //_______________________________________________________________________
 469 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param,
 470                                     Float_t *prm0,Float_t *steprm,
 471                                     Float_t *chisqr,Float_t *spe,
 472                                     Float_t *speFit ){
 473     //
 474     Int_t   k, nnn, mmm, i;
 475     Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 476     const Int_t knParam = 5;
 477     Int_t npeak = (Int_t)param[0];
 478     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 479     for( k=1; k<(npeak*knParam+1); k++ ){
 480         p1 = param[k];
 481         delta = steprm[k];
 482         d1 = delta;
 483         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 484         if( fabs( p1 ) > 1.0E-6 )
 485             if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 486             else  delta = (Float_t)1.0E-4;
 487         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 488         PeakFunc( xdim, zdim, param, speFit );
 489         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 490         p2 = p1+delta;
 491         param[k] = p2;
 492         PeakFunc( xdim, zdim, param, speFit );
 493         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 494         if( chisq1 < chisq2 ){
 495             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 496             delta = -delta;
 497             t = p1;
 498             p1 = p2;
 499             p2 = t;
 500             t = chisq1;
 501             chisq1 = chisq2;
 502             chisq2 = t;
 503         } // end if
 504         i = 1; nnn = 0;
 505         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 506             nnn++;
 507             p3 = p2 + delta;
 508             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 509             if( mmm == 0 ){
 510                 d1 = delta;
 511                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 512                 delta *= 5;
 513             } // end if
 514             param[k] = p3;
 515             // Constrain paramiters
 516             Int_t kpos = (k-1) % knParam;
 517             switch( kpos ){
 518             case 0 :
 519                 if( param[k] <= 20 ) param[k] = fMinPeak;
 520             case 1 :
 521                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 522             case 2 :
 523                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 524             case 3 :
 525                 if( param[k] < .5 ) param[k] = .5;
 526             case 4 :
 527                 if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 528             }; // end switch
 529             PeakFunc( xdim, zdim, param, speFit );
 530             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 531             if( chisq3 < chisq2 && nnn < 50 ){
 532                 p1 = p2;
 533                 p2 = p3;
 534                 chisq1 = chisq2;
 535                 chisq2 = chisq3;
 536             }else i=0;
 537         } while( i );
 538         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 539         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 540         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 541         if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 542         else p0 = 10000;
 543         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 544         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 545         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 546         //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 547         //if( fabs( p2-p0 ) > dp ) p0 = p2;
 548         param[k] = p0;
 549         // Constrain paramiters
 550         Int_t kpos = (k-1) % knParam;
 551         switch( kpos ){
 552         case 0 :
 553             if( param[k] <= 20 ) param[k] = fMinPeak;
 554         case 1 :
 555             if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 556         case 2 :
 557             if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 558         case 3 :
 559             if( param[k] < .5 ) param[k] = .5;
 560         case 4 :
 561             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 562         }; // end switch
 563         PeakFunc( xdim, zdim, param, speFit );
 564         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 565         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 566         if( chisqt <= *chisqr ) *chisqr = chisqt;
 567         else param[k] = prm0[k];
 568         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 569         steprm[k] = (param[k]-prm0[k])/5;
 570         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 571     } // end for k
 572     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 573     PeakFunc( xdim, zdim, param, speFit );
 574     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 575     return;
 576 }
 577 //_________________________________________________________________________
 578 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 579                                            Float_t *param, Float_t *spe,
 580                                            Int_t *niter, Float_t *chir ){
 581     // fit method from Comput. Phys. Commun 46(1987) 149
 582     const Float_t kchilmt = 0.01;  //   relative accuracy
 583     const Int_t   knel = 3;        //   for parabolic minimization
 584     const Int_t   knstop = 50;     //   Max. iteration number
 585     const Int_t   knParam = 5;
 586     Int_t npeak = (Int_t)param[0];
 587     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 588     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 589     Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 590     Int_t   n, k, iterNum = 0;
 591     Float_t *prm0 = new Float_t[npeak*knParam+1];
 592     Float_t *step = new Float_t[npeak*knParam+1];
 593     Float_t *schi = new Float_t[npeak*knParam+1];
 594     Float_t *sprm[3];
 595     sprm[0] = new Float_t[npeak*knParam+1];
 596     sprm[1] = new Float_t[npeak*knParam+1];
 597     sprm[2] = new Float_t[npeak*knParam+1];
 598     Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 599     Float_t *speFit = new Float_t[ xdim*zdim ];
 600     PeakFunc( xdim, zdim, param, speFit );
 601     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 602     chi1 = chi0;
 603     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 604     for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 605         step[k] = param[k] / 20.0 ;
 606         step[k+1] = param[k+1] / 50.0;
 607         step[k+2] = param[k+2] / 50.0;
 608         step[k+3] = param[k+3] / 20.0;
 609         step[k+4] = param[k+4] / 20.0;
 610     } // end for k
 611     Int_t out = 0;
 612     do{
 613         iterNum++;
 614         chi0 = chi1;
 615         Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 616         reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 617         // EXIT conditions
 618         if( reldif < (float) kchilmt ){
 619             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 620             *niter = iterNum;
 621             out = 0;
 622             break;
 623         } // end if
 624         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 625             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 626             *niter = iterNum;
 627             out = 0;
 628             break;
 629         } // end if
 630         if( iterNum > 5*knstop ){
 631             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 632             *niter = iterNum;
 633             out = 1;
 634             break;
 635         } // end if
 636         if( iterNum <= knel ) continue;
 637         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 638         if( n > 3 || n == 0 ) continue;
 639         schi[n-1] = chi1;
 640         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 641         if( n != 3 ) continue;
 642         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 643         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 644         for( k=1; k<(npeak*knParam+1); k++ ){
 645             Float_t tmp0 = sprm[0][k];
 646             Float_t tmp1 = sprm[1][k];
 647             Float_t tmp2 = sprm[2][k];
 648             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 649             a += (schi[2]*(tmp0-tmp1));
 650             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 651             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 652                                                  (tmp0*tmp0-tmp1*tmp1)));
 653             if ((double)a < 1.0E-6) prmin = 0;
 654             else prmin = (float) (0.5*b/a);
 655             dp = 5*(tmp2-tmp0);
 656             if (fabs(prmin-tmp2) > fabs(dp)) prmin = tmp2+dp;
 657             param[k] = prmin;
 658             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 659         } // end for k
 660     } while( kTRUE );
 661     delete [] prm0;
 662     delete [] step;
 663     delete [] schi;
 664     delete [] sprm[0];
 665     delete [] sprm[1];
 666     delete [] sprm[2];
 667     delete [] speFit;
 668     return( out );
 669 }
 670 //______________________________________________________________________
 671 void AliITSClusterFinderSDD::ResolveClustersE(){
 672     // The function to resolve clusters if the clusters overlapping exists
 673     Int_t i;
 674     static AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 675     // get number of clusters for this module
 676     Int_t nofClusters = fClusters->GetEntriesFast();
 677     nofClusters -= fNclusters;
 678     Int_t fNofMaps = fSegmentation->Npz();
 679     Int_t fNofAnodes = fNofMaps/2;
 680     Int_t fMaxNofSamples = fSegmentation->Npx();
 681     Int_t dummy=0;
 682     Double_t fTimeStep = fSegmentation->Dpx( dummy );
 683     Double_t fSddLength = fSegmentation->Dx();
 684     Double_t fDriftSpeed = fResponse->DriftSpeed();
 685     Double_t anodePitch = fSegmentation->Dpz( dummy );
 686     Float_t n, baseline;
 687     fResponse->GetNoiseParam( n, baseline );
 688     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 689     // fill Map of signals
 690     fMap->FillMap();
 691     for( Int_t j=0; j<nofClusters; j++ ){
 692         // get cluster information
 693         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 694         Int_t astart = clusterJ->Astart();
 695         Int_t astop = clusterJ->Astop();
 696         Int_t tstart = clusterJ->Tstartf();
 697         Int_t tstop = clusterJ->Tstopf();
 698         Int_t wing = (Int_t)clusterJ->W();
 699         if( wing == 2 ){
 700             astart += fNofAnodes;
 701             astop  += fNofAnodes;
 702         } // end if
 703         Int_t xdim = tstop-tstart+3;
 704         Int_t zdim = astop-astart+3;
 705         if(xdim > 50 || zdim > 30) { cout << "Warning: xdim: " << xdim << ", zdim: " << zdim << endl; continue; }
 706         Float_t *sp = new Float_t[ xdim*zdim+1 ];
 707         memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 708         // make a local map from cluster region
 709         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 710             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 711                 Float_t fadc = fMap->GetSignal( ianode, itime );
 712                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 713                 else fadc = 0.;
 714                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 715                 sp[index] = fadc;
 716             } // time loop
 717         } // anode loop
 718         // search peaks on cluster
 719         const Int_t kNp = 150;
 720         Int_t peakX1[kNp];
 721         Int_t peakZ1[kNp];
 722         Float_t peakAmp1[kNp];
 723         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 724         // if multiple peaks, split cluster
 725         if( npeak >= 1 ){
 726             //  cout << "npeak " << npeak << endl;
 727             //  clusterJ->PrintInfo();
 728             Float_t *par = new Float_t[npeak*5+1];
 729             par[0] = (Float_t)npeak;
 730             // Initial paramiters in cell dimentions
 731             Int_t k1 = 1;
 732             for( i=0; i<npeak; i++ ){
 733                 par[k1] = peakAmp1[i];
 734                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 735                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 736                 if( electronics == 1 )
 737                     par[k1+3] = 2.; // PASCAL
 738                 else if( electronics == 2 )
 739                     par[k1+3] = 0.7; // tau [timebin]  OLA
 740                 par[k1+4] = .4;    // sigma     [anodepich]
 741                 k1+=5;
 742             } // end for i
 743             Int_t niter;
 744             Float_t chir;
 745             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 746             Float_t peakX[kNp];
 747             Float_t peakZ[kNp];
 748             Float_t sigma[kNp];
 749             Float_t tau[kNp];
 750             Float_t peakAmp[kNp];
 751             Float_t integral[kNp];
 752             //get integrals => charge for each peak
 753             PeakFunc( xdim, zdim, par, sp, integral );
 754             k1 = 1;
 755             for( i=0; i<npeak; i++ ){
 756                 peakAmp[i] = par[k1];
 757                 peakX[i] = par[k1+1];
 758                 peakZ[i] = par[k1+2];
 759                 tau[i] = par[k1+3];
 760                 sigma[i] = par[k1+4];
 761                 k1+=5;
 762             } // end for i
 763             // calculate paramiter for new clusters
 764             for( i=0; i<npeak; i++ ){
 765                 AliITSRawClusterSDD clusterI( *clusterJ );
 766                 Int_t newAnode = peakZ1[i]-1 + astart;
 767                 Int_t newiTime = peakX1[i]-1 + tstart;
 768                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 769                 if(newiTime>shift&&newiTime<(fMaxNofSamples-shift)) shift = 0;
 770                 Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 771                 clusterI.SetPeakPos( peakpos );
 772                 clusterI.SetPeakAmpl( peakAmp1[i] );
 773                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 774                 Float_t newiTimef = peakX[i] - 1 + tstart;
 775                 if( wing == 2 ) newAnodef -= fNofAnodes;
 776                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 777                 newiTimef *= fTimeStep;
 778                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 779                 if( electronics == 1 ){
 780                     newiTimef *= 0.999438;    // PASCAL
 781                     newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 782                 }else if( electronics == 2 )
 783                     newiTimef *= 0.99714;    // OLA
 784                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 785                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 786                 clusterI.SetX( driftPath*sign * 0.0001 );
 787                 clusterI.SetZ( anodePath * 0.0001 );
 788                 clusterI.SetAnode( newAnodef );
 789                 clusterI.SetTime( newiTimef );
 790                 clusterI.SetAsigma( sigma[i]*anodePitch );
 791                 clusterI.SetTsigma( tau[i]*fTimeStep );
 792                 clusterI.SetQ( integral[i] );
 793                 //      clusterI.PrintInfo();
 794                 iTS->AddCluster( 1, &clusterI );
 795             } // end for i
 796             fClusters->RemoveAt( j );
 797             delete [] par;
 798         } else cout <<" --- Peak not found!!!!  minpeak=" << fMinPeak<<
 799                    " cluster peak=" << clusterJ->PeakAmpl() <<
 800                    " npeak=" << npeak << endl << endl;
 801         delete [] sp;
 802     } // cluster loop
 803     fClusters->Compress();
 804     fMap->ClearMap();
 805 }
 806 //________________________________________________________________________
 807 void  AliITSClusterFinderSDD::GroupClusters(){
 808     // group clusters
 809     Int_t dummy=0;
 810     Float_t fTimeStep = fSegmentation->Dpx(dummy);
 811     // get number of clusters for this module
 812     Int_t nofClusters = fClusters->GetEntriesFast();
 813     nofClusters -= fNclusters;
 814     AliITSRawClusterSDD *clusterI;
 815     AliITSRawClusterSDD *clusterJ;
 816     Int_t *label = new Int_t [nofClusters];
 817     Int_t i,j;
 818     for(i=0; i<nofClusters; i++) label[i] = 0;
 819     for(i=0; i<nofClusters; i++) {
 820         if(label[i] != 0) continue;
 821         for(j=i+1; j<nofClusters; j++) {
 822             if(label[j] != 0) continue;
 823             clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 824             clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 825             // 1.3 good
 826             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 827             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 828             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 829             if(!pair) continue;
 830             //      clusterI->PrintInfo();
 831             //      clusterJ->PrintInfo();
 832             clusterI->Add(clusterJ);
 833             label[j] = 1;
 834             fClusters->RemoveAt(j);
 835             j=i; // <- Ernesto
 836         } // J clusters
 837         label[i] = 1;
 838     } // I clusters
 839     fClusters->Compress();
 840
 841     delete [] label;
 842     return;
 843 }
 844 //________________________________________________________________________
 845 void AliITSClusterFinderSDD::SelectClusters(){
 846     // get number of clusters for this module
 847     Int_t nofClusters = fClusters->GetEntriesFast();
 848
 849     nofClusters -= fNclusters;
 850     Int_t i;
 851     for(i=0; i<nofClusters; i++) {
 852         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
 853         Int_t rmflg = 0;
 854         Float_t wy = 0.;
 855         if(clusterI->Anodes() != 0.) {
 856             wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
 857         } // end if
 858         Int_t amp = (Int_t) clusterI->PeakAmpl();
 859         Int_t cha = (Int_t) clusterI->Q();
 860         if(amp < fMinPeak) rmflg = 1;
 861         if(cha < fMinCharge) rmflg = 1;
 862         if(wy < fMinNCells) rmflg = 1;
 863         //if(wy > fMaxNCells) rmflg = 1;
 864         if(rmflg) fClusters->RemoveAt(i);
 865     } // I clusters
 866     fClusters->Compress();
 867     return;
 868 }
 869 //__________________________________________________________________________
 870 void AliITSClusterFinderSDD::ResolveClusters(){
 871     // The function to resolve clusters if the clusters overlapping exists
 872 /*    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 873     // get number of clusters for this module
 874     Int_t nofClusters = fClusters->GetEntriesFast();
 875     nofClusters -= fNclusters;
 876     //cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","
 877     // <<fNclusters<<endl;
 878     Int_t fNofMaps = fSegmentation->Npz();
 879     Int_t fNofAnodes = fNofMaps/2;
 880     Int_t dummy=0;
 881     Double_t fTimeStep = fSegmentation->Dpx(dummy);
 882     Double_t fSddLength = fSegmentation->Dx();
 883     Double_t fDriftSpeed = fResponse->DriftSpeed();
 884     Double_t anodePitch = fSegmentation->Dpz(dummy);
 885     Float_t n, baseline;
 886     fResponse->GetNoiseParam(n,baseline);
 887     Float_t dzz_1A = anodePitch * anodePitch / 12;
 888     // fill Map of signals
 889     fMap->FillMap();
 890     Int_t j,i,ii,ianode,anode,itime;
 891     Int_t wing,astart,astop,tstart,tstop,nanode;
 892     Double_t fadc,ClusterTime;
 893     Double_t q[400],x[400],z[400]; // digit charges and coordinates
 894     for(j=0; j<nofClusters; j++) {
 895         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 896         Int_t ndigits = 0;
 897         astart=clusterJ->Astart();
 898         astop=clusterJ->Astop();
 899         tstart=clusterJ->Tstartf();
 900         tstop=clusterJ->Tstopf();
 901         nanode=clusterJ->Anodes();  // <- Ernesto
 902         wing=(Int_t)clusterJ->W();
 903         if(wing == 2) {
 904             astart += fNofAnodes;
 905             astop  += fNofAnodes;
 906         }  // end if
 907         // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
 908         //      <<tstart<<","<<tstop<<endl;
 909         // clear the digit arrays
 910         for(ii=0; ii<400; ii++) {
 911             q[ii] = 0.;
 912             x[ii] = 0.;
 913             z[ii] = 0.;
 914         } // end for ii
 915
 916         for(ianode=astart; ianode<=astop; ianode++) {
 917             for(itime=tstart; itime<=tstop; itime++) {
 918                 fadc=fMap->GetSignal(ianode,itime);
 919                 if(fadc>baseline) {
 920                     fadc-=(Double_t)baseline;
 921                     q[ndigits] = fadc*(fTimeStep/160);  // KeV
 922                     anode = ianode;
 923                     if(wing == 2) anode -= fNofAnodes;
 924                     z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
 925                     ClusterTime = itime*fTimeStep;
 926                     if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;// ns
 927                     x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
 928                     if(wing == 1) x[ndigits] *= (-1);
 929                     // cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","
 930                     //     <<fadc<<endl;
 931                     // cout<<"wing,anode,ndigits,charge ="<<wing<<","
 932                     //      <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
 933                     ndigits++;
 934                     continue;
 935                 } //  end if
 936                 fadc=0;
 937                 //            cout<<"fadc=0, ndigits ="<<ndigits<<endl;
 938             } // time loop
 939         } // anode loop
 940         //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
 941         // Fit cluster to resolve for two separate ones --------------------
 942         Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
 943         Double_t dxx=0., dzz=0., dxz=0.;
 944         Double_t scl = 0., tmp, tga, elps = -1.;
 945         Double_t xfit[2], zfit[2], qfit[2];
 946         Double_t pitchz = anodePitch*1.e-4;             // cm
 947         Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
 948         Double_t sigma2;
 949         Int_t nfhits;
 950         Int_t nbins = ndigits;
 951         Int_t separate = 0;
 952         // now, all lengths are in microns
 953         for (ii=0; ii<nbins; ii++) {
 954             qq += q[ii];
 955             xm += x[ii]*q[ii];
 956             zm += z[ii]*q[ii];
 957             xx += x[ii]*x[ii]*q[ii];
 958             zz += z[ii]*z[ii]*q[ii];
 959             xz += x[ii]*z[ii]*q[ii];
 960         } // end for ii
 961         xm /= qq;
 962         zm /= qq;
 963         xx /= qq;
 964         zz /= qq;
 965         xz /= qq;
 966         dxx = xx - xm*xm;
 967         dzz = zz - zm*zm;
 968         dxz = xz - xm*zm;
 969
 970         // shrink the cluster in the time direction proportionaly to the
 971         // dxx/dzz, which lineary depends from the drift path
 972         // new  Ernesto........
 973         if( nanode == 1 ){
 974             dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
 975             scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
 976         } // end if
 977         if( nanode == 2 ){
 978             scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
 979         } // end if
 980         if( nanode == 3 ){
 981             scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
 982         } // end if
 983         if( nanode > 3 ){
 984             scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
 985         } // end if
 986         //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","
 987         //  <<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
 988         //  old Boris.........
 989         //  tmp=29730. - 585.*fabs(xm/1000.);
 990         //  scl=TMath::Sqrt(tmp/130000.);
 991
 992         xm *= scl;
 993         xx *= scl*scl;
 994         xz *= scl;
 995
 996         dxx = xx - xm*xm;
 997         //   dzz = zz - zm*zm;
 998         dxz = xz - xm*zm;
 999         //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1000         // <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1001         // if(dzz < 7200.) dzz=7200.;//for one anode cluster dzz = anode**2/12
1002
1003         if (dxx < 0.) dxx=0.;
1004         // the data if no cluster overlapping (the coordunates are in cm)
1005         nfhits = 1;
1006         xfit[0] = xm*1.e-4;
1007         zfit[0] = zm*1.e-4;
1008         qfit[0] = qq;
1009         //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1010
1011         if (nbins >= 7) {
1012             if (dxz==0.) tga=0.;
1013             else {
1014                 tmp=0.5*(dzz-dxx)/dxz;
1015                 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1016                                                    tmp+TMath::Sqrt(tmp*tmp+1);
1017             } // end if dxz
1018             elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1019             // change from microns to cm
1020             xm *= 1.e-4;
1021             zm *= 1.e-4;
1022             zz *= 1.e-8;
1023             xx *= 1.e-8;
1024             xz *= 1.e-8;
1025             dxz *= 1.e-8;
1026             dxx *= 1.e-8;
1027             dzz *= 1.e-8;
1028             //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1029             //  <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1030             for (i=0; i<nbins; i++) {
1031                 x[i] = x[i] *= scl;
1032                 x[i] = x[i] *= 1.e-4;
1033                 z[i] = z[i] *= 1.e-4;
1034             } // end for i
1035             //     cout<<"!!! elps ="<<elps<<endl;
1036             if (elps < 0.3) { // try to separate hits
1037                 separate = 1;
1038                 tmp=atan(tga);
1039                 Double_t cosa=cos(tmp),sina=sin(tmp);
1040                 Double_t a1=0., x1=0., xxx=0.;
1041                 for (i=0; i<nbins; i++) {
1042                     tmp=x[i]*cosa + z[i]*sina;
1043                     if (q[i] > a1) {
1044                         a1=q[i];
1045                         x1=tmp;
1046                     } // end if
1047                     xxx += tmp*tmp*tmp*q[i];
1048                 } // end for i
1049                 xxx /= qq;
1050                 Double_t z12=-sina*xm + cosa*zm;
1051                 sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1052                 xm=cosa*xm + sina*zm;
1053                 xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1054                 Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1055                 Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1056                 for (i=0; i<33; i++) { // solve a system of equations
1057                     Double_t x1_old=x1, x2_old=x2, r_old=r;
1058                     Double_t c11=x1-x2;
1059                     Double_t c12=r;
1060                     Double_t c13=1-r;
1061                     Double_t c21=x1*x1 - x2*x2;
1062                     Double_t c22=2*r*x1;
1063                     Double_t c23=2*(1-r)*x2;
1064                     Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1065                     Double_t c32=3*r*(sigma2 + x1*x1);
1066                     Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1067                     Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1068                     Double_t f2=-(r*(sigma2+x1*x1)+(1-r)*(sigma2+x2*x2)- xx);
1069                     Double_t f3=-(r*x1*(3*sigma2+x1*x1)+(1-r)*x2*
1070                                                          (3*sigma2+x2*x2)-xxx);
1071                     Double_t d=c11*c22*c33+c21*c32*c13+c12*c23*c31-
1072                                        c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1073                     if (d==0.) {
1074                         cout<<"*********** d=0 ***********\n";
1075                         break;
1076                     } // end if
1077                     Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1078                         f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1079                     Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1080                         c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1081                     Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1082                         c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1083                     r  += dr/d;
1084                     x1 += d1/d;
1085                     x2 += d2/d;
1086                     if (fabs(x1-x1_old) > 0.0001) continue;
1087                     if (fabs(x2-x2_old) > 0.0001) continue;
1088                     if (fabs(r-r_old)/5 > 0.001) continue;
1089                     a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1090                     Double_t a2=a1*(1-r)/r;
1091                     qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina +
1092                                                                 z12*cosa;
1093                     qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
1094                                                                 z12*cosa;
1095                     nfhits=2;
1096                     break; // Ok !
1097                 } // end for i
1098                 if (i==33) cerr<<"No more iterations ! "<<endl;
1099             } // end of attempt to separate overlapped clusters
1100         } // end of nbins cut
1101         if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1102         if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="
1103                                                      <<elps<<","<<nfhits<<endl;
1104         if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1105         for (i=0; i<nfhits; i++) {
1106             xfit[i] *= (1.e+4/scl);
1107             if(wing == 1) xfit[i] *= (-1);
1108             zfit[i] *= 1.e+4;
1109             //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","
1110             // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1111         } // end for i
1112         Int_t ncl = nfhits;
1113         if(nfhits == 1 && separate == 1) {
1114             cout<<"!!!!! no separate"<<endl;
1115             ncl = -2;
1116         }  // end if
1117         if(nfhits == 2) {
1118             cout << "Split cluster: " << endl;
1119             clusterJ->PrintInfo();
1120             cout << " in: " << endl;
1121             for (i=0; i<nfhits; i++) {
1122                 // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,
1123                                                -1,-1,(Float_t)qfit[i],ncl,0,0,
1124                                                (Float_t)xfit[i],
1125                                                (Float_t)zfit[i],0,0,0,0,
1126                                                 tstart,tstop,astart,astop);
1127             //  AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,
1128             //                                 -1,(Float_t)qfit[i],0,0,0,
1129             //                                  (Float_t)xfit[i],
1130             //                                  (Float_t)zfit[i],0,0,0,0,
1131             //                                  tstart,tstop,astart,astop,ncl);
1132             // ???????????
1133             // if(wing == 1) xfit[i] *= (-1);
1134             Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1135             Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1136             Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1137             Float_t peakpos = clusterJ->PeakPos();
1138             Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1139             Float_t clusterDriftPath = Time*fDriftSpeed;
1140             clusterDriftPath = fSddLength-clusterDriftPath;
1141             AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,
1142                                                                  Time,qfit[i],
1143                                                clusterPeakAmplitude,peakpos,
1144                                                0.,0.,clusterDriftPath,
1145                                          clusteranodePath,clusterJ->Samples()/2
1146                                     ,tstart,tstop,0,0,0,astart,astop);
1147             clust->PrintInfo();
1148             iTS->AddCluster(1,clust);
1149             //  cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="
1150             // <<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]
1151             // <<","<<ncl<<endl;
1152             delete clust;
1153         }// nfhits loop
1154         fClusters->RemoveAt(j);
1155     } // if nfhits = 2
1156 } // cluster loop
1157 fClusters->Compress();
1158 fMap->ClearMap();
1159 */
1160     return;
1161 }
1162 //______________________________________________________________________
1163 void AliITSClusterFinderSDD::GetRecPoints(){
1164     // get rec points
1165     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1166     // get number of clusters for this module
1167     Int_t nofClusters = fClusters->GetEntriesFast();
1168     nofClusters -= fNclusters;
1169     const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1170     const Float_t kconv = 1.0e-4;
1171     const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1172     const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1173     Int_t i;
1174     Int_t ix, iz, idx=-1;
1175     AliITSdigitSDD *dig=0;
1176     Int_t ndigits=fDigits->GetEntriesFast();
1177     for(i=0; i<nofClusters; i++) {
1178         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1179         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1180         if(clusterI) idx=clusterI->PeakPos();
1181         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1182         // try peak neighbours - to be done
1183         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1184         if(!dig) {
1185             // try cog
1186             fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1187             dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1188             // if null try neighbours
1189             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1190             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1191             if (!dig) printf("SDD: cannot assign the track number!\n");
1192         } //  end if !dig
1193         AliITSRecPoint rnew;
1194         rnew.SetX(clusterI->X());
1195         rnew.SetZ(clusterI->Z());
1196         rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1197         rnew.SetdEdX(kconvGeV*clusterI->Q());
1198         rnew.SetSigmaX2(kRMSx*kRMSx);
1199         rnew.SetSigmaZ2(kRMSz*kRMSz);
1200         if(dig) rnew.fTracks[0]=dig->fTracks[0];
1201         if(dig) rnew.fTracks[1]=dig->fTracks[1];
1202         if(dig) rnew.fTracks[2]=dig->fTracks[2];
1203         //printf("SDD: i %d track1 track2 track3 %d %d %d x y %f %f\n",
1204         //         i,rnew.fTracks[0],rnew.fTracks[1],rnew.fTracks[2],c
1205         //         lusterI->X(),clusterI->Z());
1206         iTS->AddRecPoint(rnew);
1207     } // I clusters
1208     fMap->ClearMap();
1209 }
1210 //______________________________________________________________________
1211 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1212     // find raw clusters
1213
1214     Find1DClustersE();
1215     GroupClusters();
1216     SelectClusters();
1217     ResolveClustersE();
1218     GetRecPoints();
1219 }
1220 //_______________________________________________________________________
1221 void AliITSClusterFinderSDD::Print(){
1222     // Print SDD cluster finder Parameters
1223
1224     cout << "**************************************************" << endl;
1225     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1226     cout << "**************************************************" << endl;
1227     cout << "Number of Clusters: " << fNclusters << endl;
1228     cout << "Anode Tolerance: " << fDAnode << endl;
1229     cout << "Time  Tolerance: " << fDTime << endl;
1230     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1231     cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1232     cout << "Minimum Amplitude: " << fMinPeak << endl;
1233     cout << "Minimum Charge: " << fMinCharge << endl;
1234     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1235     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1236     cout << "**************************************************" << endl;
1237 }