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->ClearMap();
 105     fMap->SetThreshold(fCutAmplitude);
 106     fMap->FillMap();
 107
 108     Float_t noise;
 109     Float_t baseline;
 110     fResponse->GetNoiseParam(noise,baseline);
 111
 112     Int_t nofFoundClusters = 0;
 113     Int_t i;
 114     Float_t **dfadc = new Float_t*[fNofAnodes];
 115     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 116     Float_t fadc  = 0.;
 117     Float_t fadc1 = 0.;
 118     Float_t fadc2 = 0.;
 119     Int_t j,k,idx,l,m;
 120     for(j=0;j<2;j++) {
 121         for(k=0;k<fNofAnodes;k++) {
 122             idx = j*fNofAnodes+k;
 123             // signal (fadc) & derivative (dfadc)
 124             dfadc[k][255]=0.;
 125             for(l=0; l<fMaxNofSamples; l++) {
 126                 fadc2=(Float_t)fMap->GetSignal(idx,l);
 127                 if(l>0) fadc1=(Float_t)fMap->GetSignal(idx,l-1);
 128                 if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 129             } // samples
 130         } // anodes
 131
 132         for(k=0;k<fNofAnodes;k++) {
 133         //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 134             idx = j*fNofAnodes+k;
 135             Int_t imax  = 0;
 136             Int_t imaxd = 0;
 137             Int_t it    = 0;
 138             while(it <= fMaxNofSamples-3) {
 139                 imax  = it;
 140                 imaxd = it;
 141                 // maximum of signal
 142                 Float_t fadcmax  = 0.;
 143                 Float_t dfadcmax = 0.;
 144                 Int_t lthrmina   = 1;
 145                 Int_t lthrmint   = 3;
 146                 Int_t lthra      = 1;
 147                 Int_t lthrt      = 0;
 148                 for(m=0;m<20;m++) {
 149                     Int_t id = it+m;
 150                     if(id>=fMaxNofSamples) break;
 151                     fadc=(float)fMap->GetSignal(idx,id);
 152                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 153                     if(fadc > (float)fCutAmplitude) {
 154                         lthrt++;
 155                     } // end if
 156                     if(dfadc[k][id] > dfadcmax) {
 157                         dfadcmax = dfadc[k][id];
 158                         imaxd    = id;
 159                     } // end if
 160                 } // end for m
 161                 it = imaxd;
 162                 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 163                 // cluster charge
 164                 Int_t tstart = it-2;
 165                 if(tstart < 0) tstart = 0;
 166                 Bool_t ilcl = 0;
 167                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 168                 if(ilcl) {
 169                     nofFoundClusters++;
 170                     Int_t tstop      = tstart;
 171                     Float_t dfadcmin = 10000.;
 172                     Int_t ij;
 173                     for(ij=0; ij<20; ij++) {
 174                         if(tstart+ij > 255) { tstop = 255; break; }
 175                         fadc=(float)fMap->GetSignal(idx,tstart+ij);
 176                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 177                            (fadc > fCutAmplitude)) {
 178                             tstop = tstart+ij+5;
 179                             if(tstop > 255) tstop = 255;
 180                             dfadcmin = dfadc[k][it+ij];
 181                         } // end if
 182                     } // end for ij
 183
 184                     Float_t clusterCharge = 0.;
 185                     Float_t clusterAnode  = k+0.5;
 186                     Float_t clusterTime   = 0.;
 187                     Int_t   clusterMult   = 0;
 188                     Float_t clusterPeakAmplitude = 0.;
 189                     Int_t its,peakpos     = -1;
 190                     Float_t n, baseline;
 191                     fResponse->GetNoiseParam(n,baseline);
 192                     for(its=tstart; its<=tstop; its++) {
 193                         fadc=(float)fMap->GetSignal(idx,its);
 194                         if(fadc>baseline) fadc -= baseline;
 195                         else fadc = 0.;
 196                         clusterCharge += fadc;
 197                         // as a matter of fact we should take the peak
 198                         // pos before FFT
 199                         // to get the list of tracks !!!
 200                         if(fadc > clusterPeakAmplitude) {
 201                             clusterPeakAmplitude = fadc;
 202                             //peakpos=fMap->GetHitIndex(idx,its);
 203                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 204                             if(its>shift && its<(fMaxNofSamples-shift))
 205                                 peakpos  = fMap->GetHitIndex(idx,its+shift);
 206                             else peakpos = fMap->GetHitIndex(idx,its);
 207                             if(peakpos<0) peakpos =fMap->GetHitIndex(idx,its);
 208                         } // end if
 209                         clusterTime += fadc*its;
 210                         if(fadc > 0) clusterMult++;
 211                         if(its == tstop) {
 212                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 213                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 214                             //ns
 215                         } // end if
 216                     } // end for its
 217
 218                     Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 219                                                anodePitch;
 220                     Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 221                     clusterDriftPath = fSddLength-clusterDriftPath;
 222                     if(clusterCharge <= 0.) break;
 223                     AliITSRawClusterSDD clust(j+1,//i
 224                                               clusterAnode,clusterTime,//ff
 225                                               clusterCharge, //f
 226                                               clusterPeakAmplitude, //f
 227                                               peakpos, //i
 228                                               0.,0.,clusterDriftPath,//fff
 229                                               clusteranodePath, //f
 230                                               clusterMult, //i
 231                                               0,0,0,0,0,0,0);//7*i
 232                     iTS->AddCluster(1,&clust);
 233                     it = tstop;
 234                 } // ilcl
 235                 it++;
 236             } // while (samples)
 237         } // anodes
 238     } // detectors (2)
 239
 240     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 241     delete [] dfadc;
 242
 243     return;
 244 }
 245
 246
 247
 248 //______________________________________________________________________
 249 void AliITSClusterFinderSDD::Find1DClustersE(){
 250     // find 1D clusters
 251     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 252     // retrieve the parameters
 253     Int_t fNofMaps = fSegmentation->Npz();
 254     Int_t fMaxNofSamples = fSegmentation->Npx();
 255     Int_t fNofAnodes = fNofMaps/2;
 256     Int_t dummy=0;
 257     Float_t fTimeStep = fSegmentation->Dpx( dummy );
 258     Float_t fSddLength = fSegmentation->Dx();
 259     Float_t fDriftSpeed = fResponse->DriftSpeed();
 260     Float_t anodePitch = fSegmentation->Dpz( dummy );
 261     Float_t n, baseline;
 262     fResponse->GetNoiseParam( n, baseline );
 263     // map the signal
 264     fMap->ClearMap();
 265     fMap->SetThreshold( fCutAmplitude );
 266     fMap->FillMap();
 267
 268     Int_t nClu = 0;
 269     //        cout << "Search  cluster... "<< endl;
 270     for( Int_t j=0; j<2; j++ ){
 271         for( Int_t k=0; k<fNofAnodes; k++ ){
 272             Int_t idx = j*fNofAnodes+k;
 273             Bool_t on = kFALSE;
 274             Int_t start = 0;
 275             Int_t nTsteps = 0;
 276             Float_t fmax = 0.;
 277             Int_t lmax = 0;
 278             Float_t charge = 0.;
 279             Float_t time = 0.;
 280             Float_t anode = k+0.5;
 281             Int_t peakpos = -1;
 282             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 283                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 284                 if( fadc > 0.0 ){
 285                     if( on == kFALSE && l<fMaxNofSamples-4){
 286                         // star RawCluster (reset var.)
 287                         Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 288                         if( fadc1 < fadc ) continue;
 289                         start = l;
 290                         fmax = 0.;
 291                         lmax = 0;
 292                         time = 0.;
 293                         charge = 0.;
 294                         on = kTRUE;
 295                         nTsteps = 0;
 296                     } // end if on...
 297                     nTsteps++ ;
 298                     if( fadc > baseline ) fadc -= baseline;
 299                     else fadc=0.;
 300                     charge += fadc;
 301                     time += fadc*l;
 302                     if( fadc > fmax ){
 303                         fmax = fadc;
 304                         lmax = l;
 305                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 306                         if( l > shift && l < (fMaxNofSamples-shift) )
 307                             peakpos = fMap->GetHitIndex( idx, l+shift );
 308                         else
 309                             peakpos = fMap->GetHitIndex( idx, l );
 310                         if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
 311                     } // end if fadc
 312                 }else{ // end fadc>0
 313                     if( on == kTRUE ){
 314                         if( nTsteps > 2 ){
 315                             //  min # of timesteps for a RawCluster
 316                             // Found a RawCluster...
 317                             Int_t stop = l-1;
 318                             time /= (charge/fTimeStep);   // ns
 319                                 // time = lmax*fTimeStep;   // ns
 320                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 321                             Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 322                             Float_t driftPath = time*fDriftSpeed;
 323                             driftPath = fSddLength-driftPath;
 324                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 325                                                       fmax, peakpos,0.,0.,
 326                                                       driftPath,anodePath,
 327                                                       nTsteps,start,stop,
 328                                                       start, stop, 1, k, k );
 329                             iTS->AddCluster( 1, &clust );
 330                             //        clust.PrintInfo();
 331                             nClu++;
 332                         } // end if nTsteps
 333                         on = kFALSE;
 334                     } // end if on==kTRUE
 335                 } // end if fadc>0
 336             } // samples
 337         } // anodes
 338     } // wings
 339     //        cout << "# Rawclusters " << nClu << endl;
 340     return;
 341 }
 342 //_______________________________________________________________________
 343 Int_t AliITSClusterFinderSDD::SearchPeak(Float_t *spect,Int_t xdim,Int_t zdim,
 344                                          Int_t *peakX, Int_t *peakZ,
 345                                          Float_t *peakAmp, Float_t minpeak ){
 346     // search peaks on a 2D cluster
 347     Int_t npeak = 0;    // # peaks
 348     Int_t i,j;
 349     // search peaks
 350     for( Int_t z=1; z<zdim-1; z++ ){
 351         for( Int_t x=2; x<xdim-3; x++ ){
 352             Float_t sxz = spect[x*zdim+z];
 353             Float_t sxz1 = spect[(x+1)*zdim+z];
 354             Float_t sxz2 = spect[(x-1)*zdim+z];
 355             // search a local max. in s[x,z]
 356             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 357             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 358                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 359                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 360                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 361                 // peak found
 362                 peakX[npeak] = x;
 363                 peakZ[npeak] = z;
 364                 peakAmp[npeak] = sxz;
 365                 npeak++;
 366             } // end if ....
 367         } // end for x
 368     } // end for z
 369     // search groups of peaks with same amplitude.
 370     Int_t *flag = new Int_t[npeak];
 371     for( i=0; i<npeak; i++ ) flag[i] = 0;
 372     for( i=0; i<npeak; i++ ){
 373         for( j=0; j<npeak; j++ ){
 374             if( i==j) continue;
 375             if( flag[j] > 0 ) continue;
 376             if( peakAmp[i] == peakAmp[j] &&
 377                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 378                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 379                 if( flag[i] == 0) flag[i] = i+1;
 380                 flag[j] = flag[i];
 381             } // end if ...
 382         } // end for j
 383     } // end for i
 384     // make average of peak groups
 385     for( i=0; i<npeak; i++ ){
 386         Int_t nFlag = 1;
 387         if( flag[i] <= 0 ) continue;
 388         for( j=0; j<npeak; j++ ){
 389             if( i==j ) continue;
 390             if( flag[j] != flag[i] ) continue;
 391             peakX[i] += peakX[j];
 392             peakZ[i] += peakZ[j];
 393             nFlag++;
 394             npeak--;
 395             for( Int_t k=j; k<npeak; k++ ){
 396                 peakX[k] = peakX[k+1];
 397                 peakZ[k] = peakZ[k+1];
 398                 peakAmp[k] = peakAmp[k+1];
 399                 flag[k] = flag[k+1];
 400             } // end for k
 401             j--;
 402         } // end for j
 403         if( nFlag > 1 ){
 404             peakX[i] /= nFlag;
 405             peakZ[i] /= nFlag;
 406         } // end fi nFlag
 407     } // end for i
 408     delete [] flag;
 409     return( npeak );
 410 }
 411 //______________________________________________________________________
 412 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par,
 413                                        Float_t *spe, Float_t *integral){
 414     // function used to fit the clusters
 415     // par -> parameters..
 416     // par[0]  number of peaks.
 417     // for each peak i=1, ..., par[0]
 418     //                 par[i] = Ampl.
 419     //                 par[i+1] = xpos
 420     //                 par[i+2] = zpos
 421     //                 par[i+3] = tau
 422     //                 par[i+4] = sigma.
 423     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 424     const Int_t knParam = 5;
 425     Int_t npeak = (Int_t)par[0];
 426
 427     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 428
 429     Int_t k = 1;
 430     for( Int_t i=0; i<npeak; i++ ){
 431         if( integral != 0 ) integral[i] = 0.;
 432         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 433         Float_t T2 = par[k+3];   // PASCAL
 434         if( electronics == 2 ) { T2 *= T2; T2 *= 2; } // OLA
 435         for( Int_t z=0; z<zdim; z++ ){
 436             for( Int_t x=0; x<xdim; x++ ){
 437                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 438                 Float_t x2 = 0.;
 439                 Float_t signal = 0.;
 440                 if( electronics == 1 ){ // PASCAL
 441                     x2 = (x-par[k+1]+T2)/T2;
 442                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 443                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 444                 }else if( electronics == 2 ) { // OLA
 445                     x2 = (x-par[k+1])*(x-par[k+1])/T2;
 446                     signal = par[k]  * exp( -x2 - z2 );
 447                 } else {
 448                     cout << "Wrong SDD Electronics =" << electronics << endl;
 449                     // exit( 1 );
 450                 } // end if electronicx
 451                 spe[x*zdim+z] += signal;
 452                 if( integral != 0 ) integral[i] += signal;
 453             } // end for x
 454         } // end for z
 455         k += knParam;
 456     } // end for i
 457     return;
 458 }
 459 //__________________________________________________________________________
 460 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
 461                                         Float_t *speFit ){
 462     // EVALUATES UNNORMALIZED CHI-SQUARED
 463     Float_t chi2 = 0.;
 464     for( Int_t z=0; z<zdim; z++ ){
 465         for( Int_t x=1; x<xdim-1; x++ ){
 466             Int_t index = x*zdim+z;
 467             Float_t tmp = spe[index] - speFit[index];
 468             chi2 += tmp*tmp;
 469         } // end for x
 470     } // end for z
 471     return( chi2 );
 472 }
 473 //_______________________________________________________________________
 474 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param,
 475                                     Float_t *prm0,Float_t *steprm,
 476                                     Float_t *chisqr,Float_t *spe,
 477                                     Float_t *speFit ){
 478     //
 479     Int_t   k, nnn, mmm, i;
 480     Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 481     const Int_t knParam = 5;
 482     Int_t npeak = (Int_t)param[0];
 483     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 484     for( k=1; k<(npeak*knParam+1); k++ ){
 485         p1 = param[k];
 486         delta = steprm[k];
 487         d1 = delta;
 488         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 489         if( fabs( p1 ) > 1.0E-6 )
 490             if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 491             else  delta = (Float_t)1.0E-4;
 492         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 493         PeakFunc( xdim, zdim, param, speFit );
 494         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 495         p2 = p1+delta;
 496         param[k] = p2;
 497         PeakFunc( xdim, zdim, param, speFit );
 498         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 499         if( chisq1 < chisq2 ){
 500             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 501             delta = -delta;
 502             t = p1;
 503             p1 = p2;
 504             p2 = t;
 505             t = chisq1;
 506             chisq1 = chisq2;
 507             chisq2 = t;
 508         } // end if
 509         i = 1; nnn = 0;
 510         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 511             nnn++;
 512             p3 = p2 + delta;
 513             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 514             if( mmm == 0 ){
 515                 d1 = delta;
 516                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 517                 delta *= 5;
 518             } // end if
 519             param[k] = p3;
 520             // Constrain paramiters
 521             Int_t kpos = (k-1) % knParam;
 522             switch( kpos ){
 523             case 0 :
 524                 if( param[k] <= 20 ) param[k] = fMinPeak;
 525                 break;
 526             case 1 :
 527                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 528                 break;
 529             case 2 :
 530                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 531                 break;
 532             case 3 :
 533                 if( param[k] < .5 ) param[k] = .5;
 534                 break;
 535             case 4 :
 536                 if( param[k] < .288 ) param[k] = .288;        // 1/sqrt(12) = 0.288
 537                 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 538                 break;
 539             }; // end switch
 540             PeakFunc( xdim, zdim, param, speFit );
 541             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 542             if( chisq3 < chisq2 && nnn < 50 ){
 543                 p1 = p2;
 544                 p2 = p3;
 545                 chisq1 = chisq2;
 546                 chisq2 = chisq3;
 547             }else i=0;
 548         } while( i );
 549         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 550         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 551         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 552         if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 553         else p0 = 10000;
 554         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 555         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 556         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 557         //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 558         //if( fabs( p2-p0 ) > dp ) p0 = p2;
 559         param[k] = p0;
 560         // Constrain paramiters
 561         Int_t kpos = (k-1) % knParam;
 562         switch( kpos ){
 563         case 0 :
 564             if( param[k] <= 20 ) param[k] = fMinPeak;
 565             break;
 566         case 1 :
 567             if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 568             break;
 569         case 2 :
 570             if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 571             break;
 572         case 3 :
 573             if( param[k] < .5 ) param[k] = .5;
 574             break;
 575         case 4 :
 576             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 577             if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 578             break;
 579         }; // end switch
 580         PeakFunc( xdim, zdim, param, speFit );
 581         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 582         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 583         if( chisqt <= *chisqr ) *chisqr = chisqt;
 584         else param[k] = prm0[k];
 585         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 586         steprm[k] = (param[k]-prm0[k])/5;
 587         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 588     } // end for k
 589     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 590     PeakFunc( xdim, zdim, param, speFit );
 591     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 592     return;
 593 }
 594 //_________________________________________________________________________
 595 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 596                                            Float_t *param, Float_t *spe,
 597                                            Int_t *niter, Float_t *chir ){
 598     // fit method from Comput. Phys. Commun 46(1987) 149
 599     const Float_t kchilmt = 0.01;  //        relative accuracy
 600     const Int_t   knel = 3;        //        for parabolic minimization
 601     const Int_t   knstop = 50;     //        Max. iteration number
 602     const Int_t   knParam = 5;
 603     Int_t npeak = (Int_t)param[0];
 604     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 605     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 606     Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 607     Int_t   n, k, iterNum = 0;
 608     Float_t *prm0 = new Float_t[npeak*knParam+1];
 609     Float_t *step = new Float_t[npeak*knParam+1];
 610     Float_t *schi = new Float_t[npeak*knParam+1];
 611     Float_t *sprm[3];
 612     sprm[0] = new Float_t[npeak*knParam+1];
 613     sprm[1] = new Float_t[npeak*knParam+1];
 614     sprm[2] = new Float_t[npeak*knParam+1];
 615     Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 616     Float_t *speFit = new Float_t[ xdim*zdim ];
 617     PeakFunc( xdim, zdim, param, speFit );
 618     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 619     chi1 = chi0;
 620     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 621         for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 622             step[k] = param[k] / 20.0 ;
 623             step[k+1] = param[k+1] / 50.0;
 624             step[k+2] = param[k+2] / 50.0;
 625             step[k+3] = param[k+3] / 20.0;
 626             step[k+4] = param[k+4] / 20.0;
 627         } // end for k
 628     Int_t out = 0;
 629     do{
 630         iterNum++;
 631             chi0 = chi1;
 632             Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 633             reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 634         // EXIT conditions
 635         if( reldif < (float) kchilmt ){
 636             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 637             *niter = iterNum;
 638             out = 0;
 639             break;
 640         } // end if
 641         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 642             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 643             *niter = iterNum;
 644             out = 0;
 645             break;
 646         } // end if
 647         if( iterNum > 5*knstop ){
 648             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 649             *niter = iterNum;
 650             out = 1;
 651             break;
 652         } // end if
 653         if( iterNum <= knel ) continue;
 654         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 655         if( n > 3 || n == 0 ) continue;
 656         schi[n-1] = chi1;
 657         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 658         if( n != 3 ) continue;
 659         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 660         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 661         for( k=1; k<(npeak*knParam+1); k++ ){
 662             Float_t tmp0 = sprm[0][k];
 663             Float_t tmp1 = sprm[1][k];
 664             Float_t tmp2 = sprm[2][k];
 665             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 666             a += (schi[2]*(tmp0-tmp1));
 667             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 668             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 669                                              (tmp0*tmp0-tmp1*tmp1)));
 670             if ((double)a < 1.0E-6) prmin = 0;
 671             else prmin = (float) (0.5*b/a);
 672             dp = 5*(tmp2-tmp0);
 673             if( fabs(prmin-tmp2) > fabs(dp) ) prmin = tmp2+dp;
 674             param[k] = prmin;
 675             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 676         } // end for k
 677     } while( kTRUE );
 678     delete [] prm0;
 679     delete [] step;
 680     delete [] schi;
 681     delete [] sprm[0];
 682     delete [] sprm[1];
 683     delete [] sprm[2];
 684     delete [] speFit;
 685     return( out );
 686 }
 687
 688 //______________________________________________________________________
 689 void AliITSClusterFinderSDD::ResolveClustersE(){
 690     // The function to resolve clusters if the clusters overlapping exists
 691     Int_t i;
 692     static AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 693     // get number of clusters for this module
 694     Int_t nofClusters = fClusters->GetEntriesFast();
 695     nofClusters -= fNclusters;
 696     Int_t fNofMaps = fSegmentation->Npz();
 697     Int_t fNofAnodes = fNofMaps/2;
 698     Int_t fMaxNofSamples = fSegmentation->Npx();
 699     Int_t dummy=0;
 700     Double_t fTimeStep = fSegmentation->Dpx( dummy );
 701     Double_t fSddLength = fSegmentation->Dx();
 702     Double_t fDriftSpeed = fResponse->DriftSpeed();
 703     Double_t anodePitch = fSegmentation->Dpz( dummy );
 704     Float_t n, baseline;
 705     fResponse->GetNoiseParam( n, baseline );
 706     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 707
 708     for( Int_t j=0; j<nofClusters; j++ ){
 709         // get cluster information
 710         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 711         Int_t astart = clusterJ->Astart();
 712         Int_t astop = clusterJ->Astop();
 713         Int_t tstart = clusterJ->Tstartf();
 714         Int_t tstop = clusterJ->Tstopf();
 715         Int_t wing = (Int_t)clusterJ->W();
 716         if( wing == 2 ){
 717             astart += fNofAnodes;
 718             astop  += fNofAnodes;
 719         } // end if
 720         Int_t xdim = tstop-tstart+3;
 721         Int_t zdim = astop-astart+3;
 722         if(xdim > 50 || zdim > 30) { cout << "Warning: xdim: " << xdim << ", zdim: " << zdim << endl; continue; }
 723         Float_t *sp = new Float_t[ xdim*zdim+1 ];
 724         memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 725
 726         // make a local map from cluster region
 727         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 728             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 729                 Float_t fadc = fMap->GetSignal( ianode, itime );
 730                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 731                 else fadc = 0.;
 732                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 733                 sp[index] = fadc;
 734             } // time loop
 735         } // anode loop
 736
 737         // search peaks on cluster
 738         const Int_t kNp = 150;
 739         Int_t peakX1[kNp];
 740         Int_t peakZ1[kNp];
 741         Float_t peakAmp1[kNp];
 742         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 743
 744         // if multiple peaks, split cluster
 745         if( npeak >= 1 )
 746         {
 747             //        cout << "npeak " << npeak << endl;
 748             //        clusterJ->PrintInfo();
 749             Float_t *par = new Float_t[npeak*5+1];
 750             par[0] = (Float_t)npeak;
 751             // Initial paramiters in cell dimentions
 752             Int_t k1 = 1;
 753             for( i=0; i<npeak; i++ ){
 754                 par[k1] = peakAmp1[i];
 755                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 756                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 757                 if( electronics == 1 )
 758                     par[k1+3] = 2.; // PASCAL
 759                 else if( electronics == 2 )
 760                     par[k1+3] = 0.7; // tau [timebin]  OLA
 761                 par[k1+4] = .4;    // sigma        [anodepich]
 762                 k1+=5;
 763             } // end for i
 764             Int_t niter;
 765             Float_t chir;
 766             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 767             Float_t peakX[kNp];
 768             Float_t peakZ[kNp];
 769             Float_t sigma[kNp];
 770             Float_t tau[kNp];
 771             Float_t peakAmp[kNp];
 772             Float_t integral[kNp];
 773             //get integrals => charge for each peak
 774             PeakFunc( xdim, zdim, par, sp, integral );
 775             k1 = 1;
 776             for( i=0; i<npeak; i++ ){
 777                 peakAmp[i] = par[k1];
 778                 peakX[i] = par[k1+1];
 779                 peakZ[i] = par[k1+2];
 780                 tau[i] = par[k1+3];
 781                 sigma[i] = par[k1+4];
 782                 k1+=5;
 783             } // end for i
 784             // calculate parameter for new clusters
 785             for( i=0; i<npeak; i++ ){
 786                 AliITSRawClusterSDD clusterI( *clusterJ );
 787                 Int_t newAnode = peakZ1[i]-1 + astart;
 788                 Int_t newiTime = peakX1[i]-1 + tstart;
 789                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 790                 if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )
 791                     shift = 0;
 792                 Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 793                 clusterI.SetPeakPos( peakpos );
 794                 clusterI.SetPeakAmpl( peakAmp1[i] );
 795                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 796                 Float_t newiTimef = peakX[i] - 1 + tstart;
 797                 if( wing == 2 ) newAnodef -= fNofAnodes;
 798                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 799                 newiTimef *= fTimeStep;
 800                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 801                 if( electronics == 1 ){
 802                     newiTimef *= 0.999438;    // PASCAL
 803                     newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 804                 }else if( electronics == 2 )
 805                     newiTimef *= 0.99714;    // OLA
 806                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 807                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 808                 clusterI.SetX( driftPath*sign * 0.0001 );
 809                 clusterI.SetZ( anodePath * 0.0001 );
 810                 clusterI.SetAnode( newAnodef );
 811                 clusterI.SetTime( newiTimef );
 812                 clusterI.SetAsigma( sigma[i]*anodePitch );
 813                 clusterI.SetTsigma( tau[i]*fTimeStep );
 814                 clusterI.SetQ( integral[i] );
 815                 //        clusterI.PrintInfo();
 816                 iTS->AddCluster( 1, &clusterI );
 817             } // end for i
 818             fClusters->RemoveAt( j );
 819             delete [] par;
 820         } else {
 821             clusterJ->PrintInfo();
 822             cout <<" --- Peak not found!!!!  minpeak=" << fMinPeak<<
 823                    " cluster peak=" << clusterJ->PeakAmpl() <<
 824                    " npeak=" << npeak << endl << "xdim=" << xdim-2 << " zdim="
 825                    << zdim-2 << endl << endl;
 826         }
 827         delete [] sp;
 828     } // cluster loop
 829     fClusters->Compress();
 830 //    fMap->ClearMap();
 831 }
 832
 833
 834 //________________________________________________________________________
 835 void  AliITSClusterFinderSDD::GroupClusters(){
 836     // group clusters
 837     Int_t dummy=0;
 838     Float_t fTimeStep = fSegmentation->Dpx(dummy);
 839     // get number of clusters for this module
 840     Int_t nofClusters = fClusters->GetEntriesFast();
 841     nofClusters -= fNclusters;
 842     AliITSRawClusterSDD *clusterI;
 843     AliITSRawClusterSDD *clusterJ;
 844     Int_t *label = new Int_t [nofClusters];
 845     Int_t i,j;
 846     for(i=0; i<nofClusters; i++) label[i] = 0;
 847     for(i=0; i<nofClusters; i++) {
 848         if(label[i] != 0) continue;
 849         for(j=i+1; j<nofClusters; j++) {
 850             if(label[j] != 0) continue;
 851             clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 852             clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 853             // 1.3 good
 854             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 855             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 856             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 857             if(!pair) continue;
 858             //      clusterI->PrintInfo();
 859             //      clusterJ->PrintInfo();
 860             clusterI->Add(clusterJ);
 861             label[j] = 1;
 862             fClusters->RemoveAt(j);
 863             j=i; // <- Ernesto
 864         } // J clusters
 865         label[i] = 1;
 866     } // I clusters
 867     fClusters->Compress();
 868
 869     delete [] label;
 870     return;
 871 }
 872 //________________________________________________________________________
 873 void AliITSClusterFinderSDD::SelectClusters(){
 874     // get number of clusters for this module
 875     Int_t nofClusters = fClusters->GetEntriesFast();
 876
 877     nofClusters -= fNclusters;
 878     Int_t i;
 879     for(i=0; i<nofClusters; i++) {
 880         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
 881         Int_t rmflg = 0;
 882         Float_t wy = 0.;
 883         if(clusterI->Anodes() != 0.) {
 884             wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
 885         } // end if
 886         Int_t amp = (Int_t) clusterI->PeakAmpl();
 887         Int_t cha = (Int_t) clusterI->Q();
 888         if(amp < fMinPeak) rmflg = 1;
 889         if(cha < fMinCharge) rmflg = 1;
 890         if(wy < fMinNCells) rmflg = 1;
 891         //if(wy > fMaxNCells) rmflg = 1;
 892         if(rmflg) fClusters->RemoveAt(i);
 893     } // I clusters
 894     fClusters->Compress();
 895     return;
 896 }
 897 //__________________________________________________________________________
 898 void AliITSClusterFinderSDD::ResolveClusters(){
 899     // The function to resolve clusters if the clusters overlapping exists
 900 /*    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 901     // get number of clusters for this module
 902     Int_t nofClusters = fClusters->GetEntriesFast();
 903     nofClusters -= fNclusters;
 904     //cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","
 905     // <<fNclusters<<endl;
 906     Int_t fNofMaps = fSegmentation->Npz();
 907     Int_t fNofAnodes = fNofMaps/2;
 908     Int_t dummy=0;
 909     Double_t fTimeStep = fSegmentation->Dpx(dummy);
 910     Double_t fSddLength = fSegmentation->Dx();
 911     Double_t fDriftSpeed = fResponse->DriftSpeed();
 912     Double_t anodePitch = fSegmentation->Dpz(dummy);
 913     Float_t n, baseline;
 914     fResponse->GetNoiseParam(n,baseline);
 915     Float_t dzz_1A = anodePitch * anodePitch / 12;
 916     // fill Map of signals
 917     fMap->FillMap();
 918     Int_t j,i,ii,ianode,anode,itime;
 919     Int_t wing,astart,astop,tstart,tstop,nanode;
 920     Double_t fadc,ClusterTime;
 921     Double_t q[400],x[400],z[400]; // digit charges and coordinates
 922     for(j=0; j<nofClusters; j++) {
 923         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 924         Int_t ndigits = 0;
 925         astart=clusterJ->Astart();
 926         astop=clusterJ->Astop();
 927         tstart=clusterJ->Tstartf();
 928         tstop=clusterJ->Tstopf();
 929         nanode=clusterJ->Anodes();  // <- Ernesto
 930         wing=(Int_t)clusterJ->W();
 931         if(wing == 2) {
 932             astart += fNofAnodes;
 933             astop  += fNofAnodes;
 934         }  // end if
 935         // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
 936         //      <<tstart<<","<<tstop<<endl;
 937         // clear the digit arrays
 938         for(ii=0; ii<400; ii++) {
 939             q[ii] = 0.;
 940             x[ii] = 0.;
 941             z[ii] = 0.;
 942         } // end for ii
 943
 944         for(ianode=astart; ianode<=astop; ianode++) {
 945             for(itime=tstart; itime<=tstop; itime++) {
 946                 fadc=fMap->GetSignal(ianode,itime);
 947                 if(fadc>baseline) {
 948                     fadc-=(Double_t)baseline;
 949                     q[ndigits] = fadc*(fTimeStep/160);  // KeV
 950                     anode = ianode;
 951                     if(wing == 2) anode -= fNofAnodes;
 952                     z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
 953                     ClusterTime = itime*fTimeStep;
 954                     if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;// ns
 955                     x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
 956                     if(wing == 1) x[ndigits] *= (-1);
 957                     // cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","
 958                     //     <<fadc<<endl;
 959                     // cout<<"wing,anode,ndigits,charge ="<<wing<<","
 960                     //      <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
 961                     ndigits++;
 962                     continue;
 963                 } //  end if
 964                 fadc=0;
 965                 //              cout<<"fadc=0, ndigits ="<<ndigits<<endl;
 966             } // time loop
 967         } // anode loop
 968         //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
 969         // Fit cluster to resolve for two separate ones --------------------
 970         Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
 971         Double_t dxx=0., dzz=0., dxz=0.;
 972         Double_t scl = 0., tmp, tga, elps = -1.;
 973         Double_t xfit[2], zfit[2], qfit[2];
 974         Double_t pitchz = anodePitch*1.e-4;             // cm
 975         Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
 976         Double_t sigma2;
 977         Int_t nfhits;
 978         Int_t nbins = ndigits;
 979         Int_t separate = 0;
 980         // now, all lengths are in microns
 981         for (ii=0; ii<nbins; ii++) {
 982             qq += q[ii];
 983             xm += x[ii]*q[ii];
 984             zm += z[ii]*q[ii];
 985             xx += x[ii]*x[ii]*q[ii];
 986             zz += z[ii]*z[ii]*q[ii];
 987             xz += x[ii]*z[ii]*q[ii];
 988         } // end for ii
 989         xm /= qq;
 990         zm /= qq;
 991         xx /= qq;
 992         zz /= qq;
 993         xz /= qq;
 994         dxx = xx - xm*xm;
 995         dzz = zz - zm*zm;
 996         dxz = xz - xm*zm;
 997
 998         // shrink the cluster in the time direction proportionaly to the
 999         // dxx/dzz, which lineary depends from the drift path
1000         // new  Ernesto........
1001         if( nanode == 1 ){
1002             dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
1003             scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
1004         } // end if
1005         if( nanode == 2 ){
1006             scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1007         } // end if
1008         if( nanode == 3 ){
1009             scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1010         } // end if
1011         if( nanode > 3 ){
1012             scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
1013         } // end if
1014         //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","
1015         //  <<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
1016         //  old Boris.........
1017         //  tmp=29730. - 585.*fabs(xm/1000.);
1018         //  scl=TMath::Sqrt(tmp/130000.);
1019
1020         xm *= scl;
1021         xx *= scl*scl;
1022         xz *= scl;
1023
1024         dxx = xx - xm*xm;
1025         //   dzz = zz - zm*zm;
1026         dxz = xz - xm*zm;
1027         //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1028         // <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1029         // if(dzz < 7200.) dzz=7200.;//for one anode cluster dzz = anode**2/12
1030
1031         if (dxx < 0.) dxx=0.;
1032         // the data if no cluster overlapping (the coordunates are in cm)
1033         nfhits = 1;
1034         xfit[0] = xm*1.e-4;
1035         zfit[0] = zm*1.e-4;
1036         qfit[0] = qq;
1037         //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1038
1039         if (nbins >= 7) {
1040             if (dxz==0.) tga=0.;
1041             else {
1042                 tmp=0.5*(dzz-dxx)/dxz;
1043                 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1044                                                    tmp+TMath::Sqrt(tmp*tmp+1);
1045             } // end if dxz
1046             elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1047             // change from microns to cm
1048             xm *= 1.e-4;
1049             zm *= 1.e-4;
1050             zz *= 1.e-8;
1051             xx *= 1.e-8;
1052             xz *= 1.e-8;
1053             dxz *= 1.e-8;
1054             dxx *= 1.e-8;
1055             dzz *= 1.e-8;
1056             //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1057             //  <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1058             for (i=0; i<nbins; i++) {
1059                 x[i] = x[i] *= scl;
1060                 x[i] = x[i] *= 1.e-4;
1061                 z[i] = z[i] *= 1.e-4;
1062             } // end for i
1063             //     cout<<"!!! elps ="<<elps<<endl;
1064             if (elps < 0.3) { // try to separate hits
1065                 separate = 1;
1066                 tmp=atan(tga);
1067                 Double_t cosa=cos(tmp),sina=sin(tmp);
1068                 Double_t a1=0., x1=0., xxx=0.;
1069                 for (i=0; i<nbins; i++) {
1070                     tmp=x[i]*cosa + z[i]*sina;
1071                     if (q[i] > a1) {
1072                         a1=q[i];
1073                         x1=tmp;
1074                     } // end if
1075                     xxx += tmp*tmp*tmp*q[i];
1076                 } // end for i
1077                 xxx /= qq;
1078                 Double_t z12=-sina*xm + cosa*zm;
1079                 sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1080                 xm=cosa*xm + sina*zm;
1081                 xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1082                 Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1083                 Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1084                 for (i=0; i<33; i++) { // solve a system of equations
1085                     Double_t x1_old=x1, x2_old=x2, r_old=r;
1086                     Double_t c11=x1-x2;
1087                     Double_t c12=r;
1088                     Double_t c13=1-r;
1089                     Double_t c21=x1*x1 - x2*x2;
1090                     Double_t c22=2*r*x1;
1091                     Double_t c23=2*(1-r)*x2;
1092                     Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1093                     Double_t c32=3*r*(sigma2 + x1*x1);
1094                     Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1095                     Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1096                     Double_t f2=-(r*(sigma2+x1*x1)+(1-r)*(sigma2+x2*x2)- xx);
1097                     Double_t f3=-(r*x1*(3*sigma2+x1*x1)+(1-r)*x2*
1098                                                          (3*sigma2+x2*x2)-xxx);
1099                     Double_t d=c11*c22*c33+c21*c32*c13+c12*c23*c31-
1100                                        c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1101                     if (d==0.) {
1102                         cout<<"*********** d=0 ***********\n";
1103                         break;
1104                     } // end if
1105                     Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1106                         f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1107                     Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1108                         c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1109                     Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1110                         c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1111                     r  += dr/d;
1112                     x1 += d1/d;
1113                     x2 += d2/d;
1114                     if (fabs(x1-x1_old) > 0.0001) continue;
1115                     if (fabs(x2-x2_old) > 0.0001) continue;
1116                     if (fabs(r-r_old)/5 > 0.001) continue;
1117                     a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1118                     Double_t a2=a1*(1-r)/r;
1119                     qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina +
1120                                                                 z12*cosa;
1121                     qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
1122                                                                 z12*cosa;
1123                     nfhits=2;
1124                     break; // Ok !
1125                 } // end for i
1126                 if (i==33) cerr<<"No more iterations ! "<<endl;
1127             } // end of attempt to separate overlapped clusters
1128         } // end of nbins cut
1129         if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1130         if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="
1131                                                      <<elps<<","<<nfhits<<endl;
1132         if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1133         for (i=0; i<nfhits; i++) {
1134             xfit[i] *= (1.e+4/scl);
1135             if(wing == 1) xfit[i] *= (-1);
1136             zfit[i] *= 1.e+4;
1137             //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","
1138             // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1139         } // end for i
1140         Int_t ncl = nfhits;
1141         if(nfhits == 1 && separate == 1) {
1142             cout<<"!!!!! no separate"<<endl;
1143             ncl = -2;
1144         }  // end if
1145         if(nfhits == 2) {
1146             cout << "Split cluster: " << endl;
1147             clusterJ->PrintInfo();
1148             cout << " in: " << endl;
1149             for (i=0; i<nfhits; i++) {
1150                 // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,
1151                                                -1,-1,(Float_t)qfit[i],ncl,0,0,
1152                                                (Float_t)xfit[i],
1153                                                (Float_t)zfit[i],0,0,0,0,
1154                                                 tstart,tstop,astart,astop);
1155             //        AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,
1156             //                                 -1,(Float_t)qfit[i],0,0,0,
1157             //                                  (Float_t)xfit[i],
1158             //                                  (Float_t)zfit[i],0,0,0,0,
1159             //                                  tstart,tstop,astart,astop,ncl);
1160             // ???????????
1161             // if(wing == 1) xfit[i] *= (-1);
1162             Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1163             Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1164             Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1165             Float_t peakpos = clusterJ->PeakPos();
1166             Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1167             Float_t clusterDriftPath = Time*fDriftSpeed;
1168             clusterDriftPath = fSddLength-clusterDriftPath;
1169             AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,
1170                                                                  Time,qfit[i],
1171                                                clusterPeakAmplitude,peakpos,
1172                                                0.,0.,clusterDriftPath,
1173                                          clusteranodePath,clusterJ->Samples()/2
1174                                     ,tstart,tstop,0,0,0,astart,astop);
1175             clust->PrintInfo();
1176             iTS->AddCluster(1,clust);
1177             //        cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="
1178             // <<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]
1179             // <<","<<ncl<<endl;
1180             delete clust;
1181         }// nfhits loop
1182         fClusters->RemoveAt(j);
1183     } // if nfhits = 2
1184 } // cluster loop
1185 fClusters->Compress();
1186 fMap->ClearMap();
1187 */
1188     return;
1189 }
1190 //______________________________________________________________________
1191 void AliITSClusterFinderSDD::GetRecPoints(){
1192     // get rec points
1193     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1194     // get number of clusters for this module
1195     Int_t nofClusters = fClusters->GetEntriesFast();
1196     nofClusters -= fNclusters;
1197     const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1198     const Float_t kconv = 1.0e-4;
1199     const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1200     const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1201     Int_t i;
1202     Int_t ix, iz, idx=-1;
1203     AliITSdigitSDD *dig=0;
1204     Int_t ndigits=fDigits->GetEntriesFast();
1205     for(i=0; i<nofClusters; i++) {
1206         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1207         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1208         if(clusterI) idx=clusterI->PeakPos();
1209         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1210         // try peak neighbours - to be done
1211         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1212         if(!dig) {
1213             // try cog
1214             fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1215             dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1216             // if null try neighbours
1217             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1218             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1219             if (!dig) printf("SDD: cannot assign the track number!\n");
1220         } //  end if !dig
1221         AliITSRecPoint rnew;
1222         rnew.SetX(clusterI->X());
1223         rnew.SetZ(clusterI->Z());
1224         rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1225         rnew.SetdEdX(kconvGeV*clusterI->Q());
1226         rnew.SetSigmaX2(kRMSx*kRMSx);
1227         rnew.SetSigmaZ2(kRMSz*kRMSz);
1228         if(dig) rnew.fTracks[0]=dig->fTracks[0];
1229         if(dig) rnew.fTracks[1]=dig->fTracks[1];
1230         if(dig) rnew.fTracks[2]=dig->fTracks[2];
1231         //printf("SDD: i %d track1 track2 track3 %d %d %d x y %f %f\n",
1232         //         i,rnew.fTracks[0],rnew.fTracks[1],rnew.fTracks[2],c
1233         //         lusterI->X(),clusterI->Z());
1234         iTS->AddRecPoint(rnew);
1235     } // I clusters
1236 //    fMap->ClearMap();
1237 }
1238 //______________________________________________________________________
1239 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1240     // find raw clusters
1241
1242     fModule = mod;
1243
1244     Find1DClustersE();
1245     GroupClusters();
1246     SelectClusters();
1247     ResolveClustersE();
1248     GetRecPoints();
1249 }
1250 //_______________________________________________________________________
1251 void AliITSClusterFinderSDD::Print(){
1252     // Print SDD cluster finder Parameters
1253
1254     cout << "**************************************************" << endl;
1255     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1256     cout << "**************************************************" << endl;
1257     cout << "Number of Clusters: " << fNclusters << endl;
1258     cout << "Anode Tolerance: " << fDAnode << endl;
1259     cout << "Time  Tolerance: " << fDTime << endl;
1260     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1261     cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1262     cout << "Minimum Amplitude: " << fMinPeak << endl;
1263     cout << "Minimum Charge: " << fMinCharge << endl;
1264     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1265     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1266     cout << "**************************************************" << endl;
1267 }