ITS/AliITSClusterFinderSDD.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15 /*
  16   $Id$
  17   $Log$
  18  */
  19
  20 #include <iostream.h>
  21 #include <TFile.h>
  22 #include <TMath.h>
  23 #include <math.h>
  24
  25 #include "AliITSClusterFinderSDD.h"
  26 #include "AliITSMapA1.h"
  27 #include "AliITS.h"
  28 #include "AliITSdigit.h"
  29 #include "AliITSRawCluster.h"
  30 #include "AliITSRecPoint.h"
  31 #include "AliITSsegmentation.h"
  32 #include "AliITSresponseSDD.h"
  33 #include "AliRun.h"
  34
  35 ClassImp(AliITSClusterFinderSDD)
  36
  37 //______________________________________________________________________
  38 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSsegmentation *seg,
  39                                                AliITSresponse *response,
  40                                                TClonesArray *digits,
  41                                                TClonesArray *recp){
  42     // standard constructor
  43
  44     fSegmentation = seg;
  45     fResponse     = response;
  46     fDigits       = digits;
  47     fClusters     = recp;
  48     fNclusters    = fClusters->GetEntriesFast();
  49     SetCutAmplitude();
  50     SetDAnode();
  51     SetDTime();
  52     SetMinPeak();
  53     SetMinNCells();
  54     SetMaxNCells();
  55     SetTimeCorr();
  56     SetMinCharge();
  57     fMap = new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
  58 }
  59 //______________________________________________________________________
  60 AliITSClusterFinderSDD::AliITSClusterFinderSDD(){
  61     // default constructor
  62
  63     fSegmentation = 0;
  64     fResponse     = 0;
  65     fDigits       = 0;
  66     fClusters     = 0;
  67     fNclusters    = 0;
  68     fMap          = 0;
  69     fCutAmplitude = 0;
  70     SetDAnode();
  71     SetDTime();
  72     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
  73     SetMinNCells();
  74     SetMaxNCells();
  75     SetTimeCorr();
  76     SetMinCharge();
  77 }
  78 //____________________________________________________________________________
  79 AliITSClusterFinderSDD::~AliITSClusterFinderSDD(){
  80     // destructor
  81
  82     if(fMap) delete fMap;
  83 }
  84 //______________________________________________________________________
  85 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma){
  86     // set the signal threshold for cluster finder
  87     Float_t baseline,noise,noise_after_el;
  88
  89     fResponse->GetNoiseParam(noise,baseline);
  90     noise_after_el = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
  91     fCutAmplitude = (Int_t)((baseline + nsigma*noise_after_el));
  92 }
  93 //______________________________________________________________________
  94 void AliITSClusterFinderSDD::Find1DClusters(){
  95     // find 1D clusters
  96     static AliITS *iTS = (AliITS*)gAlice->GetModule("ITS");
  97
  98     // retrieve the parameters
  99     Int_t fNofMaps       = fSegmentation->Npz();
 100     Int_t fMaxNofSamples = fSegmentation->Npx();
 101     Int_t fNofAnodes     = fNofMaps/2;
 102     Int_t dummy          = 0;
 103     Float_t fTimeStep    = fSegmentation->Dpx(dummy);
 104     Float_t fSddLength   = fSegmentation->Dx();
 105     Float_t fDriftSpeed  = fResponse->DriftSpeed();
 106     Float_t anodePitch   = fSegmentation->Dpz(dummy);
 107
 108     // map the signal
 109     fMap->ClearMap();
 110     fMap->SetThreshold(fCutAmplitude);
 111     fMap->FillMap();
 112
 113     Float_t noise;
 114     Float_t baseline;
 115     fResponse->GetNoiseParam(noise,baseline);
 116
 117     Int_t nofFoundClusters = 0;
 118     Int_t i;
 119     Float_t **dfadc = new Float_t*[fNofAnodes];
 120     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 121     Float_t fadc  = 0.;
 122     Float_t fadc1 = 0.;
 123     Float_t fadc2 = 0.;
 124     Int_t j,k,idx,l,m;
 125     for(j=0;j<2;j++) {
 126         for(k=0;k<fNofAnodes;k++) {
 127             idx = j*fNofAnodes+k;
 128             // signal (fadc) & derivative (dfadc)
 129             dfadc[k][255]=0.;
 130             for(l=0; l<fMaxNofSamples; l++) {
 131                 fadc2=(Float_t)fMap->GetSignal(idx,l);
 132                 if(l>0) fadc1=(Float_t)fMap->GetSignal(idx,l-1);
 133                 if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 134             } // samples
 135         } // anodes
 136
 137         for(k=0;k<fNofAnodes;k++) {
 138         //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 139             idx = j*fNofAnodes+k;
 140             Int_t imax  = 0;
 141             Int_t imaxd = 0;
 142             Int_t it    = 0;
 143             while(it <= fMaxNofSamples-3) {
 144                 imax  = it;
 145                 imaxd = it;
 146                 // maximum of signal
 147                 Float_t fadcmax  = 0.;
 148                 Float_t dfadcmax = 0.;
 149                 Int_t lthrmina   = 1;
 150                 Int_t lthrmint   = 3;
 151                 Int_t lthra      = 1;
 152                 Int_t lthrt      = 0;
 153                 for(m=0;m<20;m++) {
 154                     Int_t id = it+m;
 155                     if(id>=fMaxNofSamples) break;
 156                     fadc=(float)fMap->GetSignal(idx,id);
 157                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 158                     if(fadc > (float)fCutAmplitude) {
 159                         lthrt++;
 160                     } // end if
 161                     if(dfadc[k][id] > dfadcmax) {
 162                         dfadcmax = dfadc[k][id];
 163                         imaxd    = id;
 164                     } // end if
 165                 } // end for m
 166                 it = imaxd;
 167                 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 168                 // cluster charge
 169                 Int_t tstart = it-2;
 170                 if(tstart < 0) tstart = 0;
 171                 Bool_t ilcl = 0;
 172                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 173                 if(ilcl) {
 174                     nofFoundClusters++;
 175                     Int_t tstop      = tstart;
 176                     Float_t dfadcmin = 10000.;
 177                     Int_t ij;
 178                     for(ij=0; ij<20; ij++) {
 179                         if(tstart+ij > 255) { tstop = 255; break; }
 180                         fadc=(float)fMap->GetSignal(idx,tstart+ij);
 181                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 182                            (fadc > fCutAmplitude)) {
 183                             tstop = tstart+ij+5;
 184                             if(tstop > 255) tstop = 255;
 185                             dfadcmin = dfadc[k][it+ij];
 186                         } // end if
 187                     } // end for ij
 188
 189                     Float_t clusterCharge = 0.;
 190                     Float_t clusterAnode  = k+0.5;
 191                     Float_t clusterTime   = 0.;
 192                     Int_t   clusterMult   = 0;
 193                     Float_t clusterPeakAmplitude = 0.;
 194                     Int_t its,peakpos     = -1;
 195                     Float_t n, baseline;
 196                     fResponse->GetNoiseParam(n,baseline);
 197                     for(its=tstart; its<=tstop; its++) {
 198                         fadc=(float)fMap->GetSignal(idx,its);
 199                         if(fadc>baseline) fadc -= baseline;
 200                         else fadc = 0.;
 201                         clusterCharge += fadc;
 202                         // as a matter of fact we should take the peak
 203                         // pos before FFT
 204                         // to get the list of tracks !!!
 205                         if(fadc > clusterPeakAmplitude) {
 206                             clusterPeakAmplitude = fadc;
 207                             //peakpos=fMap->GetHitIndex(idx,its);
 208                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 209                             if(its>shift && its<(fMaxNofSamples-shift))
 210                                 peakpos  = fMap->GetHitIndex(idx,its+shift);
 211                             else peakpos = fMap->GetHitIndex(idx,its);
 212                             if(peakpos<0) peakpos =fMap->GetHitIndex(idx,its);
 213                         } // end if
 214                         clusterTime += fadc*its;
 215                         if(fadc > 0) clusterMult++;
 216                         if(its == tstop) {
 217                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 218                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 219                             //ns
 220                         } // end if
 221                     } // end for its
 222
 223                     Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 224                                                anodePitch;
 225                     Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 226                     clusterDriftPath = fSddLength-clusterDriftPath;
 227                     if(clusterCharge <= 0.) break;
 228                     AliITSRawClusterSDD clust(j+1,//i
 229                                               clusterAnode,clusterTime,//ff
 230                                               clusterCharge, //f
 231                                               clusterPeakAmplitude, //f
 232                                               peakpos, //i
 233                                               0.,0.,clusterDriftPath,//fff
 234                                               clusteranodePath, //f
 235                                               clusterMult, //i
 236                                               0,0,0,0,0,0,0);//7*i
 237                     iTS->AddCluster(1,&clust);
 238                     it = tstop;
 239                 } // ilcl
 240                 it++;
 241             } // while (samples)
 242         } // anodes
 243     } // detectors (2)
 244
 245     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 246     delete [] dfadc;
 247
 248     return;
 249 }
 250
 251
 252
 253 //______________________________________________________________________
 254 void AliITSClusterFinderSDD::Find1DClustersE(){
 255     // find 1D clusters
 256     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 257     // retrieve the parameters
 258     Int_t fNofMaps = fSegmentation->Npz();
 259     Int_t fMaxNofSamples = fSegmentation->Npx();
 260     Int_t fNofAnodes = fNofMaps/2;
 261     Int_t dummy=0;
 262     Float_t fTimeStep = fSegmentation->Dpx( dummy );
 263     Float_t fSddLength = fSegmentation->Dx();
 264     Float_t fDriftSpeed = fResponse->DriftSpeed();
 265     Float_t anodePitch = fSegmentation->Dpz( dummy );
 266     Float_t n, baseline;
 267     fResponse->GetNoiseParam( n, baseline );
 268     // map the signal
 269     fMap->ClearMap();
 270     fMap->SetThreshold( fCutAmplitude );
 271     fMap->FillMap();
 272
 273     Int_t nClu = 0;
 274     //        cout << "Search  cluster... "<< endl;
 275     for( Int_t j=0; j<2; j++ ){
 276         for( Int_t k=0; k<fNofAnodes; k++ ){
 277             Int_t idx = j*fNofAnodes+k;
 278             Bool_t on = kFALSE;
 279             Int_t start = 0;
 280             Int_t nTsteps = 0;
 281             Float_t fmax = 0.;
 282             Int_t lmax = 0;
 283             Float_t charge = 0.;
 284             Float_t time = 0.;
 285             Float_t anode = k+0.5;
 286             Int_t peakpos = -1;
 287             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 288                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 289                 if( fadc > 0.0 ){
 290                     if( on == kFALSE && l<fMaxNofSamples-4){
 291                         // star RawCluster (reset var.)
 292                         Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 293                         if( fadc1 < fadc ) continue;
 294                         start = l;
 295                         fmax = 0.;
 296                         lmax = 0;
 297                         time = 0.;
 298                         charge = 0.;
 299                         on = kTRUE;
 300                         nTsteps = 0;
 301                     } // end if on...
 302                     nTsteps++ ;
 303                     if( fadc > baseline ) fadc -= baseline;
 304                     else fadc=0.;
 305                     charge += fadc;
 306                     time += fadc*l;
 307                     if( fadc > fmax ){
 308                         fmax = fadc;
 309                         lmax = l;
 310                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 311                         if( l > shift && l < (fMaxNofSamples-shift) )
 312                             peakpos = fMap->GetHitIndex( idx, l+shift );
 313                         else
 314                             peakpos = fMap->GetHitIndex( idx, l );
 315                         if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
 316                     } // end if fadc
 317                 }else{ // end fadc>0
 318                     if( on == kTRUE ){
 319                         if( nTsteps > 2 ){
 320                             //  min # of timesteps for a RawCluster
 321                             // Found a RawCluster...
 322                             Int_t stop = l-1;
 323                             time /= (charge/fTimeStep);   // ns
 324                                 // time = lmax*fTimeStep;   // ns
 325                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 326                             Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 327                             Float_t driftPath = time*fDriftSpeed;
 328                             driftPath = fSddLength-driftPath;
 329                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 330                                                       fmax, peakpos,0.,0.,
 331                                                       driftPath,anodePath,
 332                                                       nTsteps,start,stop,
 333                                                       start, stop, 1, k, k );
 334                             iTS->AddCluster( 1, &clust );
 335                             //        clust.PrintInfo();
 336                             nClu++;
 337                         } // end if nTsteps
 338                         on = kFALSE;
 339                     } // end if on==kTRUE
 340                 } // end if fadc>0
 341             } // samples
 342         } // anodes
 343     } // wings
 344     //        cout << "# Rawclusters " << nClu << endl;
 345     return;
 346 }
 347 //_______________________________________________________________________
 348 Int_t AliITSClusterFinderSDD::SearchPeak(Float_t *spect,Int_t xdim,Int_t zdim,
 349                                          Int_t *peakX, Int_t *peakZ,
 350                                          Float_t *peakAmp, Float_t minpeak ){
 351     // search peaks on a 2D cluster
 352     Int_t npeak = 0;    // # peaks
 353     Int_t i,j;
 354     // search peaks
 355     for( Int_t z=1; z<zdim-1; z++ ){
 356         for( Int_t x=1; x<xdim-2; x++ ){
 357             Float_t sxz = spect[x*zdim+z];
 358             Float_t sxz1 = spect[(x+1)*zdim+z];
 359             Float_t sxz2 = spect[(x-1)*zdim+z];
 360             // search a local max. in s[x,z]
 361             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 362             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 363                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 364                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 365                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 366                 // peak found
 367                 peakX[npeak] = x;
 368                 peakZ[npeak] = z;
 369                 peakAmp[npeak] = sxz;
 370                 npeak++;
 371             } // end if ....
 372         } // end for x
 373     } // end for z
 374     // search groups of peaks with same amplitude.
 375     Int_t *flag = new Int_t[npeak];
 376     for( i=0; i<npeak; i++ ) flag[i] = 0;
 377     for( i=0; i<npeak; i++ ){
 378         for( j=0; j<npeak; j++ ){
 379             if( i==j) continue;
 380             if( flag[j] > 0 ) continue;
 381             if( peakAmp[i] == peakAmp[j] &&
 382                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 383                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 384                 if( flag[i] == 0) flag[i] = i+1;
 385                 flag[j] = flag[i];
 386             } // end if ...
 387         } // end for j
 388     } // end for i
 389     // make average of peak groups
 390     for( i=0; i<npeak; i++ ){
 391         Int_t nFlag = 1;
 392         if( flag[i] <= 0 ) continue;
 393         for( j=0; j<npeak; j++ ){
 394             if( i==j ) continue;
 395             if( flag[j] != flag[i] ) continue;
 396             peakX[i] += peakX[j];
 397             peakZ[i] += peakZ[j];
 398             nFlag++;
 399             npeak--;
 400             for( Int_t k=j; k<npeak; k++ ){
 401                 peakX[k] = peakX[k+1];
 402                 peakZ[k] = peakZ[k+1];
 403                 peakAmp[k] = peakAmp[k+1];
 404                 flag[k] = flag[k+1];
 405             } // end for k
 406             j--;
 407         } // end for j
 408         if( nFlag > 1 ){
 409             peakX[i] /= nFlag;
 410             peakZ[i] /= nFlag;
 411         } // end fi nFlag
 412     } // end for i
 413     delete [] flag;
 414     return( npeak );
 415 }
 416 //______________________________________________________________________
 417 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par,
 418                                        Float_t *spe, Float_t *integral){
 419     // function used to fit the clusters
 420     // par -> parameters..
 421     // par[0]  number of peaks.
 422     // for each peak i=1, ..., par[0]
 423     //                 par[i] = Ampl.
 424     //                 par[i+1] = xpos
 425     //                 par[i+2] = zpos
 426     //                 par[i+3] = tau
 427     //                 par[i+4] = sigma.
 428     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 429     const Int_t knParam = 5;
 430     Int_t npeak = (Int_t)par[0];
 431
 432     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 433
 434     Int_t k = 1;
 435     for( Int_t i=0; i<npeak; i++ ){
 436         if( integral != 0 ) integral[i] = 0.;
 437         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 438         Float_t T2 = par[k+3];   // PASCAL
 439         if( electronics == 2 ) { T2 *= T2; T2 *= 2; } // OLA
 440         for( Int_t z=0; z<zdim; z++ ){
 441             for( Int_t x=0; x<xdim; x++ ){
 442                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 443                 Float_t x2 = 0.;
 444                 Float_t signal = 0.;
 445                 if( electronics == 1 ){ // PASCAL
 446                     x2 = (x-par[k+1]+T2)/T2;
 447                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 448                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 449                 }else if( electronics == 2 ) { // OLA
 450                     x2 = (x-par[k+1])*(x-par[k+1])/T2;
 451                     signal = par[k]  * exp( -x2 - z2 );
 452                 } else {
 453                     cout << "Wrong SDD Electronics =" << electronics << endl;
 454                     // exit( 1 );
 455                 } // end if electronicx
 456                 spe[x*zdim+z] += signal;
 457                 if( integral != 0 ) integral[i] += signal;
 458             } // end for x
 459         } // end for z
 460         k += knParam;
 461     } // end for i
 462     return;
 463 }
 464 //__________________________________________________________________________
 465 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
 466                                         Float_t *speFit ){
 467     // EVALUATES UNNORMALIZED CHI-SQUARED
 468     Float_t chi2 = 0.;
 469     for( Int_t z=0; z<zdim; z++ ){
 470         for( Int_t x=1; x<xdim-1; x++ ){
 471             Int_t index = x*zdim+z;
 472             Float_t tmp = spe[index] - speFit[index];
 473             chi2 += tmp*tmp;
 474         } // end for x
 475     } // end for z
 476     return( chi2 );
 477 }
 478 //_______________________________________________________________________
 479 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param,
 480                                     Float_t *prm0,Float_t *steprm,
 481                                     Float_t *chisqr,Float_t *spe,
 482                                     Float_t *speFit ){
 483     //
 484     Int_t   k, nnn, mmm, i;
 485     Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 486     const Int_t knParam = 5;
 487     Int_t npeak = (Int_t)param[0];
 488     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 489     for( k=1; k<(npeak*knParam+1); k++ ){
 490         p1 = param[k];
 491         delta = steprm[k];
 492         d1 = delta;
 493         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 494         if( fabs( p1 ) > 1.0E-6 )
 495             if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 496             else  delta = (Float_t)1.0E-4;
 497         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 498         PeakFunc( xdim, zdim, param, speFit );
 499         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 500         p2 = p1+delta;
 501         param[k] = p2;
 502         PeakFunc( xdim, zdim, param, speFit );
 503         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 504         if( chisq1 < chisq2 ){
 505             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 506             delta = -delta;
 507             t = p1;
 508             p1 = p2;
 509             p2 = t;
 510             t = chisq1;
 511             chisq1 = chisq2;
 512             chisq2 = t;
 513         } // end if
 514         i = 1; nnn = 0;
 515         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 516             nnn++;
 517             p3 = p2 + delta;
 518             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 519             if( mmm == 0 ){
 520                 d1 = delta;
 521                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 522                 delta *= 5;
 523             } // end if
 524             param[k] = p3;
 525             // Constrain paramiters
 526             Int_t kpos = (k-1) % knParam;
 527             switch( kpos ){
 528             case 0 :
 529                 if( param[k] <= 20 ) param[k] = fMinPeak;
 530                 break;
 531             case 1 :
 532                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 533                 break;
 534             case 2 :
 535                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 536                 break;
 537             case 3 :
 538                 if( param[k] < .5 ) param[k] = .5;
 539                 break;
 540             case 4 :
 541                 if( param[k] < .288 ) param[k] = .288;        // 1/sqrt(12) = 0.288
 542                 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 543                 break;
 544             }; // end switch
 545             PeakFunc( xdim, zdim, param, speFit );
 546             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 547             if( chisq3 < chisq2 && nnn < 50 ){
 548                 p1 = p2;
 549                 p2 = p3;
 550                 chisq1 = chisq2;
 551                 chisq2 = chisq3;
 552             }else i=0;
 553         } while( i );
 554         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 555         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 556         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 557         if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 558         else p0 = 10000;
 559         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 560         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 561         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 562         //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 563         //if( fabs( p2-p0 ) > dp ) p0 = p2;
 564         param[k] = p0;
 565         // Constrain paramiters
 566         Int_t kpos = (k-1) % knParam;
 567         switch( kpos ){
 568         case 0 :
 569             if( param[k] <= 20 ) param[k] = fMinPeak;
 570             break;
 571         case 1 :
 572             if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 573             break;
 574         case 2 :
 575             if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 576             break;
 577         case 3 :
 578             if( param[k] < .5 ) param[k] = .5;
 579             break;
 580         case 4 :
 581             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 582             if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 583             break;
 584         }; // end switch
 585         PeakFunc( xdim, zdim, param, speFit );
 586         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 587         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 588         if( chisqt <= *chisqr ) *chisqr = chisqt;
 589         else param[k] = prm0[k];
 590         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 591         steprm[k] = (param[k]-prm0[k])/5;
 592         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 593     } // end for k
 594     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 595     PeakFunc( xdim, zdim, param, speFit );
 596     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 597     return;
 598 }
 599 //_________________________________________________________________________
 600 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 601                                            Float_t *param, Float_t *spe,
 602                                            Int_t *niter, Float_t *chir ){
 603     // fit method from Comput. Phys. Commun 46(1987) 149
 604     const Float_t kchilmt = 0.01;  //        relative accuracy
 605     const Int_t   knel = 3;        //        for parabolic minimization
 606     const Int_t   knstop = 50;     //        Max. iteration number
 607     const Int_t   knParam = 5;
 608     Int_t npeak = (Int_t)param[0];
 609     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 610     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 611     Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 612     Int_t   n, k, iterNum = 0;
 613     Float_t *prm0 = new Float_t[npeak*knParam+1];
 614     Float_t *step = new Float_t[npeak*knParam+1];
 615     Float_t *schi = new Float_t[npeak*knParam+1];
 616     Float_t *sprm[3];
 617     sprm[0] = new Float_t[npeak*knParam+1];
 618     sprm[1] = new Float_t[npeak*knParam+1];
 619     sprm[2] = new Float_t[npeak*knParam+1];
 620     Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 621     Float_t *speFit = new Float_t[ xdim*zdim ];
 622     PeakFunc( xdim, zdim, param, speFit );
 623     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 624     chi1 = chi0;
 625     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 626         for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 627             step[k] = param[k] / 20.0 ;
 628             step[k+1] = param[k+1] / 50.0;
 629             step[k+2] = param[k+2] / 50.0;
 630             step[k+3] = param[k+3] / 20.0;
 631             step[k+4] = param[k+4] / 20.0;
 632         } // end for k
 633     Int_t out = 0;
 634     do{
 635         iterNum++;
 636             chi0 = chi1;
 637             Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 638             reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 639         // EXIT conditions
 640         if( reldif < (float) kchilmt ){
 641             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 642             *niter = iterNum;
 643             out = 0;
 644             break;
 645         } // end if
 646         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 647             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 648             *niter = iterNum;
 649             out = 0;
 650             break;
 651         } // end if
 652         if( iterNum > 5*knstop ){
 653             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 654             *niter = iterNum;
 655             out = 1;
 656             break;
 657         } // end if
 658         if( iterNum <= knel ) continue;
 659         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 660         if( n > 3 || n == 0 ) continue;
 661         schi[n-1] = chi1;
 662         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 663         if( n != 3 ) continue;
 664         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 665         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 666         for( k=1; k<(npeak*knParam+1); k++ ){
 667             Float_t tmp0 = sprm[0][k];
 668             Float_t tmp1 = sprm[1][k];
 669             Float_t tmp2 = sprm[2][k];
 670             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 671             a += (schi[2]*(tmp0-tmp1));
 672             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 673             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 674                                              (tmp0*tmp0-tmp1*tmp1)));
 675             if ((double)a < 1.0E-6) prmin = 0;
 676             else prmin = (float) (0.5*b/a);
 677             dp = 5*(tmp2-tmp0);
 678             if( fabs(prmin-tmp2) > fabs(dp) ) prmin = tmp2+dp;
 679             param[k] = prmin;
 680             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 681         } // end for k
 682     } while( kTRUE );
 683     delete [] prm0;
 684     delete [] step;
 685     delete [] schi;
 686     delete [] sprm[0];
 687     delete [] sprm[1];
 688     delete [] sprm[2];
 689     delete [] speFit;
 690     return( out );
 691 }
 692
 693 //______________________________________________________________________
 694 void AliITSClusterFinderSDD::ResolveClustersE(){
 695     // The function to resolve clusters if the clusters overlapping exists
 696     Int_t i;
 697     static AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 698     // get number of clusters for this module
 699     Int_t nofClusters = fClusters->GetEntriesFast();
 700     nofClusters -= fNclusters;
 701     Int_t fNofMaps = fSegmentation->Npz();
 702     Int_t fNofAnodes = fNofMaps/2;
 703     Int_t fMaxNofSamples = fSegmentation->Npx();
 704     Int_t dummy=0;
 705     Double_t fTimeStep = fSegmentation->Dpx( dummy );
 706     Double_t fSddLength = fSegmentation->Dx();
 707     Double_t fDriftSpeed = fResponse->DriftSpeed();
 708     Double_t anodePitch = fSegmentation->Dpz( dummy );
 709     Float_t n, baseline;
 710     fResponse->GetNoiseParam( n, baseline );
 711     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 712
 713     for( Int_t j=0; j<nofClusters; j++ ){
 714         // get cluster information
 715         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 716         Int_t astart = clusterJ->Astart();
 717         Int_t astop = clusterJ->Astop();
 718         Int_t tstart = clusterJ->Tstartf();
 719         Int_t tstop = clusterJ->Tstopf();
 720         Int_t wing = (Int_t)clusterJ->W();
 721         if( wing == 2 ){
 722             astart += fNofAnodes;
 723             astop  += fNofAnodes;
 724         } // end if
 725         Int_t xdim = tstop-tstart+3;
 726         Int_t zdim = astop-astart+3;
 727         if(xdim > 50 || zdim > 30) { cout << "Warning: xdim: " << xdim << ", zdim: " << zdim << endl; continue; }
 728         Float_t *sp = new Float_t[ xdim*zdim+1 ];
 729         memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 730
 731         // make a local map from cluster region
 732         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 733             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 734                 Float_t fadc = fMap->GetSignal( ianode, itime );
 735                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 736                 else fadc = 0.;
 737                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 738                 sp[index] = fadc;
 739             } // time loop
 740         } // anode loop
 741
 742         // search peaks on cluster
 743         const Int_t kNp = 150;
 744         Int_t peakX1[kNp];
 745         Int_t peakZ1[kNp];
 746         Float_t peakAmp1[kNp];
 747         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 748
 749         // if multiple peaks, split cluster
 750         if( npeak >= 1 )
 751         {
 752             //        cout << "npeak " << npeak << endl;
 753             //        clusterJ->PrintInfo();
 754             Float_t *par = new Float_t[npeak*5+1];
 755             par[0] = (Float_t)npeak;
 756             // Initial parameters in cell dimentions
 757             Int_t k1 = 1;
 758             for( i=0; i<npeak; i++ ){
 759                 par[k1] = peakAmp1[i];
 760                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 761                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 762                 if( electronics == 1 )
 763                     par[k1+3] = 2.; // PASCAL
 764                 else if( electronics == 2 )
 765                     par[k1+3] = 0.7; // tau [timebin]  OLA
 766                 par[k1+4] = .4;    // sigma        [anodepich]
 767                 k1+=5;
 768             } // end for i
 769             Int_t niter;
 770             Float_t chir;
 771             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 772             Float_t peakX[kNp];
 773             Float_t peakZ[kNp];
 774             Float_t sigma[kNp];
 775             Float_t tau[kNp];
 776             Float_t peakAmp[kNp];
 777             Float_t integral[kNp];
 778             //get integrals => charge for each peak
 779             PeakFunc( xdim, zdim, par, sp, integral );
 780             k1 = 1;
 781             for( i=0; i<npeak; i++ ){
 782                 peakAmp[i] = par[k1];
 783                 peakX[i] = par[k1+1];
 784                 peakZ[i] = par[k1+2];
 785                 tau[i] = par[k1+3];
 786                 sigma[i] = par[k1+4];
 787                 k1+=5;
 788             } // end for i
 789             // calculate parameter for new clusters
 790             for( i=0; i<npeak; i++ ){
 791                 AliITSRawClusterSDD clusterI( *clusterJ );
 792                 Int_t newAnode = peakZ1[i]-1 + astart;
 793                 Int_t newiTime = peakX1[i]-1 + tstart;
 794                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 795                 if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )
 796                     shift = 0;
 797                 Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 798                 clusterI.SetPeakPos( peakpos );
 799                 clusterI.SetPeakAmpl( peakAmp1[i] );
 800                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 801                 Float_t newiTimef = peakX[i] - 1 + tstart;
 802                 if( wing == 2 ) newAnodef -= fNofAnodes;
 803                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 804                 newiTimef *= fTimeStep;
 805                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 806                 if( electronics == 1 ){
 807                 //    newiTimef *= 0.999438;    // PASCAL
 808                 //    newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 809                 }else if( electronics == 2 )
 810                     newiTimef *= 0.99714;    // OLA
 811                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 812                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 813                 clusterI.SetX( driftPath*sign * 0.0001 );
 814                 clusterI.SetZ( anodePath * 0.0001 );
 815                 clusterI.SetAnode( newAnodef );
 816                 clusterI.SetTime( newiTimef );
 817                 clusterI.SetAsigma( sigma[i]*anodePitch );
 818                 clusterI.SetTsigma( tau[i]*fTimeStep );
 819                 clusterI.SetQ( integral[i] );
 820                 //    clusterI.PrintInfo();
 821                 iTS->AddCluster( 1, &clusterI );
 822             } // end for i
 823             fClusters->RemoveAt( j );
 824             delete [] par;
 825         } else {  // something odd
 826             cout << " --- Peak not found!!!!  minpeak=" << fMinPeak<<
 827                     " cluster peak=" << clusterJ->PeakAmpl() <<
 828                     " module=" << fModule << endl;
 829             clusterJ->PrintInfo();
 830             cout << " xdim=" << xdim-2 << " zdim=" << zdim-2 << endl << endl;
 831         }
 832         delete [] sp;
 833     } // cluster loop
 834     fClusters->Compress();
 835 //    fMap->ClearMap();
 836 }
 837
 838
 839 //________________________________________________________________________
 840 void  AliITSClusterFinderSDD::GroupClusters(){
 841     // group clusters
 842     Int_t dummy=0;
 843     Float_t fTimeStep = fSegmentation->Dpx(dummy);
 844     // get number of clusters for this module
 845     Int_t nofClusters = fClusters->GetEntriesFast();
 846     nofClusters -= fNclusters;
 847     AliITSRawClusterSDD *clusterI;
 848     AliITSRawClusterSDD *clusterJ;
 849     Int_t *label = new Int_t [nofClusters];
 850     Int_t i,j;
 851     for(i=0; i<nofClusters; i++) label[i] = 0;
 852     for(i=0; i<nofClusters; i++) {
 853         if(label[i] != 0) continue;
 854         for(j=i+1; j<nofClusters; j++) {
 855             if(label[j] != 0) continue;
 856             clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 857             clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 858             // 1.3 good
 859             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 860             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 861             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 862             if(!pair) continue;
 863             //      clusterI->PrintInfo();
 864             //      clusterJ->PrintInfo();
 865             clusterI->Add(clusterJ);
 866             label[j] = 1;
 867             fClusters->RemoveAt(j);
 868             j=i; // <- Ernesto
 869         } // J clusters
 870         label[i] = 1;
 871     } // I clusters
 872     fClusters->Compress();
 873
 874     delete [] label;
 875     return;
 876 }
 877 //________________________________________________________________________
 878 void AliITSClusterFinderSDD::SelectClusters(){
 879     // get number of clusters for this module
 880     Int_t nofClusters = fClusters->GetEntriesFast();
 881
 882     nofClusters -= fNclusters;
 883     Int_t i;
 884     for(i=0; i<nofClusters; i++) {
 885         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
 886         Int_t rmflg = 0;
 887         Float_t wy = 0.;
 888         if(clusterI->Anodes() != 0.) {
 889             wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
 890         } // end if
 891         Int_t amp = (Int_t) clusterI->PeakAmpl();
 892         Int_t cha = (Int_t) clusterI->Q();
 893         if(amp < fMinPeak) rmflg = 1;
 894         if(cha < fMinCharge) rmflg = 1;
 895         if(wy < fMinNCells) rmflg = 1;
 896         //if(wy > fMaxNCells) rmflg = 1;
 897         if(rmflg) fClusters->RemoveAt(i);
 898     } // I clusters
 899     fClusters->Compress();
 900     return;
 901 }
 902 //__________________________________________________________________________
 903 void AliITSClusterFinderSDD::ResolveClusters(){
 904     // The function to resolve clusters if the clusters overlapping exists
 905 /*    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 906     // get number of clusters for this module
 907     Int_t nofClusters = fClusters->GetEntriesFast();
 908     nofClusters -= fNclusters;
 909     //cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","
 910     // <<fNclusters<<endl;
 911     Int_t fNofMaps = fSegmentation->Npz();
 912     Int_t fNofAnodes = fNofMaps/2;
 913     Int_t dummy=0;
 914     Double_t fTimeStep = fSegmentation->Dpx(dummy);
 915     Double_t fSddLength = fSegmentation->Dx();
 916     Double_t fDriftSpeed = fResponse->DriftSpeed();
 917     Double_t anodePitch = fSegmentation->Dpz(dummy);
 918     Float_t n, baseline;
 919     fResponse->GetNoiseParam(n,baseline);
 920     Float_t dzz_1A = anodePitch * anodePitch / 12;
 921     // fill Map of signals
 922     fMap->FillMap();
 923     Int_t j,i,ii,ianode,anode,itime;
 924     Int_t wing,astart,astop,tstart,tstop,nanode;
 925     Double_t fadc,ClusterTime;
 926     Double_t q[400],x[400],z[400]; // digit charges and coordinates
 927     for(j=0; j<nofClusters; j++) {
 928         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 929         Int_t ndigits = 0;
 930         astart=clusterJ->Astart();
 931         astop=clusterJ->Astop();
 932         tstart=clusterJ->Tstartf();
 933         tstop=clusterJ->Tstopf();
 934         nanode=clusterJ->Anodes();  // <- Ernesto
 935         wing=(Int_t)clusterJ->W();
 936         if(wing == 2) {
 937             astart += fNofAnodes;
 938             astop  += fNofAnodes;
 939         }  // end if
 940         // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
 941         //      <<tstart<<","<<tstop<<endl;
 942         // clear the digit arrays
 943         for(ii=0; ii<400; ii++) {
 944             q[ii] = 0.;
 945             x[ii] = 0.;
 946             z[ii] = 0.;
 947         } // end for ii
 948
 949         for(ianode=astart; ianode<=astop; ianode++) {
 950             for(itime=tstart; itime<=tstop; itime++) {
 951                 fadc=fMap->GetSignal(ianode,itime);
 952                 if(fadc>baseline) {
 953                     fadc-=(Double_t)baseline;
 954                     q[ndigits] = fadc*(fTimeStep/160);  // KeV
 955                     anode = ianode;
 956                     if(wing == 2) anode -= fNofAnodes;
 957                     z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
 958                     ClusterTime = itime*fTimeStep;
 959                     if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;// ns
 960                     x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
 961                     if(wing == 1) x[ndigits] *= (-1);
 962                     // cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","
 963                     //     <<fadc<<endl;
 964                     // cout<<"wing,anode,ndigits,charge ="<<wing<<","
 965                     //      <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
 966                     ndigits++;
 967                     continue;
 968                 } //  end if
 969                 fadc=0;
 970                 //              cout<<"fadc=0, ndigits ="<<ndigits<<endl;
 971             } // time loop
 972         } // anode loop
 973         //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
 974         // Fit cluster to resolve for two separate ones --------------------
 975         Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
 976         Double_t dxx=0., dzz=0., dxz=0.;
 977         Double_t scl = 0., tmp, tga, elps = -1.;
 978         Double_t xfit[2], zfit[2], qfit[2];
 979         Double_t pitchz = anodePitch*1.e-4;             // cm
 980         Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
 981         Double_t sigma2;
 982         Int_t nfhits;
 983         Int_t nbins = ndigits;
 984         Int_t separate = 0;
 985         // now, all lengths are in microns
 986         for (ii=0; ii<nbins; ii++) {
 987             qq += q[ii];
 988             xm += x[ii]*q[ii];
 989             zm += z[ii]*q[ii];
 990             xx += x[ii]*x[ii]*q[ii];
 991             zz += z[ii]*z[ii]*q[ii];
 992             xz += x[ii]*z[ii]*q[ii];
 993         } // end for ii
 994         xm /= qq;
 995         zm /= qq;
 996         xx /= qq;
 997         zz /= qq;
 998         xz /= qq;
 999         dxx = xx - xm*xm;
1000         dzz = zz - zm*zm;
1001         dxz = xz - xm*zm;
1002
1003         // shrink the cluster in the time direction proportionaly to the
1004         // dxx/dzz, which lineary depends from the drift path
1005         // new  Ernesto........
1006         if( nanode == 1 ){
1007             dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
1008             scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
1009         } // end if
1010         if( nanode == 2 ){
1011             scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1012         } // end if
1013         if( nanode == 3 ){
1014             scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1015         } // end if
1016         if( nanode > 3 ){
1017             scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
1018         } // end if
1019         //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","
1020         //  <<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
1021         //  old Boris.........
1022         //  tmp=29730. - 585.*fabs(xm/1000.);
1023         //  scl=TMath::Sqrt(tmp/130000.);
1024
1025         xm *= scl;
1026         xx *= scl*scl;
1027         xz *= scl;
1028
1029         dxx = xx - xm*xm;
1030         //   dzz = zz - zm*zm;
1031         dxz = xz - xm*zm;
1032         //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1033         // <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1034         // if(dzz < 7200.) dzz=7200.;//for one anode cluster dzz = anode**2/12
1035
1036         if (dxx < 0.) dxx=0.;
1037         // the data if no cluster overlapping (the coordunates are in cm)
1038         nfhits = 1;
1039         xfit[0] = xm*1.e-4;
1040         zfit[0] = zm*1.e-4;
1041         qfit[0] = qq;
1042         //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1043
1044         if (nbins >= 7) {
1045             if (dxz==0.) tga=0.;
1046             else {
1047                 tmp=0.5*(dzz-dxx)/dxz;
1048                 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1049                                                    tmp+TMath::Sqrt(tmp*tmp+1);
1050             } // end if dxz
1051             elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1052             // change from microns to cm
1053             xm *= 1.e-4;
1054             zm *= 1.e-4;
1055             zz *= 1.e-8;
1056             xx *= 1.e-8;
1057             xz *= 1.e-8;
1058             dxz *= 1.e-8;
1059             dxx *= 1.e-8;
1060             dzz *= 1.e-8;
1061             //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1062             //  <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1063             for (i=0; i<nbins; i++) {
1064                 x[i] = x[i] *= scl;
1065                 x[i] = x[i] *= 1.e-4;
1066                 z[i] = z[i] *= 1.e-4;
1067             } // end for i
1068             //     cout<<"!!! elps ="<<elps<<endl;
1069             if (elps < 0.3) { // try to separate hits
1070                 separate = 1;
1071                 tmp=atan(tga);
1072                 Double_t cosa=cos(tmp),sina=sin(tmp);
1073                 Double_t a1=0., x1=0., xxx=0.;
1074                 for (i=0; i<nbins; i++) {
1075                     tmp=x[i]*cosa + z[i]*sina;
1076                     if (q[i] > a1) {
1077                         a1=q[i];
1078                         x1=tmp;
1079                     } // end if
1080                     xxx += tmp*tmp*tmp*q[i];
1081                 } // end for i
1082                 xxx /= qq;
1083                 Double_t z12=-sina*xm + cosa*zm;
1084                 sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1085                 xm=cosa*xm + sina*zm;
1086                 xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1087                 Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1088                 Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1089                 for (i=0; i<33; i++) { // solve a system of equations
1090                     Double_t x1_old=x1, x2_old=x2, r_old=r;
1091                     Double_t c11=x1-x2;
1092                     Double_t c12=r;
1093                     Double_t c13=1-r;
1094                     Double_t c21=x1*x1 - x2*x2;
1095                     Double_t c22=2*r*x1;
1096                     Double_t c23=2*(1-r)*x2;
1097                     Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1098                     Double_t c32=3*r*(sigma2 + x1*x1);
1099                     Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1100                     Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1101                     Double_t f2=-(r*(sigma2+x1*x1)+(1-r)*(sigma2+x2*x2)- xx);
1102                     Double_t f3=-(r*x1*(3*sigma2+x1*x1)+(1-r)*x2*
1103                                                          (3*sigma2+x2*x2)-xxx);
1104                     Double_t d=c11*c22*c33+c21*c32*c13+c12*c23*c31-
1105                                        c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1106                     if (d==0.) {
1107                         cout<<"*********** d=0 ***********\n";
1108                         break;
1109                     } // end if
1110                     Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1111                         f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1112                     Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1113                         c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1114                     Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1115                         c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1116                     r  += dr/d;
1117                     x1 += d1/d;
1118                     x2 += d2/d;
1119                     if (fabs(x1-x1_old) > 0.0001) continue;
1120                     if (fabs(x2-x2_old) > 0.0001) continue;
1121                     if (fabs(r-r_old)/5 > 0.001) continue;
1122                     a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1123                     Double_t a2=a1*(1-r)/r;
1124                     qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina +
1125                                                                 z12*cosa;
1126                     qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
1127                                                                 z12*cosa;
1128                     nfhits=2;
1129                     break; // Ok !
1130                 } // end for i
1131                 if (i==33) cerr<<"No more iterations ! "<<endl;
1132             } // end of attempt to separate overlapped clusters
1133         } // end of nbins cut
1134         if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1135         if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="
1136                                                      <<elps<<","<<nfhits<<endl;
1137         if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1138         for (i=0; i<nfhits; i++) {
1139             xfit[i] *= (1.e+4/scl);
1140             if(wing == 1) xfit[i] *= (-1);
1141             zfit[i] *= 1.e+4;
1142             //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","
1143             // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1144         } // end for i
1145         Int_t ncl = nfhits;
1146         if(nfhits == 1 && separate == 1) {
1147             cout<<"!!!!! no separate"<<endl;
1148             ncl = -2;
1149         }  // end if
1150         if(nfhits == 2) {
1151             cout << "Split cluster: " << endl;
1152             clusterJ->PrintInfo();
1153             cout << " in: " << endl;
1154             for (i=0; i<nfhits; i++) {
1155                 // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,
1156                                                -1,-1,(Float_t)qfit[i],ncl,0,0,
1157                                                (Float_t)xfit[i],
1158                                                (Float_t)zfit[i],0,0,0,0,
1159                                                 tstart,tstop,astart,astop);
1160             //        AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,
1161             //                                 -1,(Float_t)qfit[i],0,0,0,
1162             //                                  (Float_t)xfit[i],
1163             //                                  (Float_t)zfit[i],0,0,0,0,
1164             //                                  tstart,tstop,astart,astop,ncl);
1165             // ???????????
1166             // if(wing == 1) xfit[i] *= (-1);
1167             Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1168             Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1169             Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1170             Float_t peakpos = clusterJ->PeakPos();
1171             Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1172             Float_t clusterDriftPath = Time*fDriftSpeed;
1173             clusterDriftPath = fSddLength-clusterDriftPath;
1174             AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,
1175                                                                  Time,qfit[i],
1176                                                clusterPeakAmplitude,peakpos,
1177                                                0.,0.,clusterDriftPath,
1178                                          clusteranodePath,clusterJ->Samples()/2
1179                                     ,tstart,tstop,0,0,0,astart,astop);
1180             clust->PrintInfo();
1181             iTS->AddCluster(1,clust);
1182             //        cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="
1183             // <<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]
1184             // <<","<<ncl<<endl;
1185             delete clust;
1186         }// nfhits loop
1187         fClusters->RemoveAt(j);
1188     } // if nfhits = 2
1189 } // cluster loop
1190 fClusters->Compress();
1191 fMap->ClearMap();
1192 */
1193     return;
1194 }
1195 //______________________________________________________________________
1196 void AliITSClusterFinderSDD::GetRecPoints(){
1197     // get rec points
1198     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1199     // get number of clusters for this module
1200     Int_t nofClusters = fClusters->GetEntriesFast();
1201     nofClusters -= fNclusters;
1202     const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1203     const Float_t kconv = 1.0e-4;
1204     const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1205     const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1206     Int_t i;
1207     Int_t ix, iz, idx=-1;
1208     AliITSdigitSDD *dig=0;
1209     Int_t ndigits=fDigits->GetEntriesFast();
1210     for(i=0; i<nofClusters; i++) {
1211         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1212         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1213         if(clusterI) idx=clusterI->PeakPos();
1214         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1215         // try peak neighbours - to be done
1216         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1217         if(!dig) {
1218             // try cog
1219             fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1220             dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1221             // if null try neighbours
1222             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1223             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1224             if (!dig) printf("SDD: cannot assign the track number!\n");
1225         } //  end if !dig
1226         AliITSRecPoint rnew;
1227         rnew.SetX(clusterI->X());
1228         rnew.SetZ(clusterI->Z());
1229         rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1230         rnew.SetdEdX(kconvGeV*clusterI->Q());
1231         rnew.SetSigmaX2(kRMSx*kRMSx);
1232         rnew.SetSigmaZ2(kRMSz*kRMSz);
1233         if(dig) rnew.fTracks[0]=dig->fTracks[0];
1234         if(dig) rnew.fTracks[1]=dig->fTracks[1];
1235         if(dig) rnew.fTracks[2]=dig->fTracks[2];
1236         //printf("SDD: i %d track1 track2 track3 %d %d %d x y %f %f\n",
1237         //         i,rnew.fTracks[0],rnew.fTracks[1],rnew.fTracks[2],c
1238         //         lusterI->X(),clusterI->Z());
1239         iTS->AddRecPoint(rnew);
1240     } // I clusters
1241 //    fMap->ClearMap();
1242 }
1243 //______________________________________________________________________
1244 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1245     // find raw clusters
1246
1247     fModule = mod;
1248
1249     Find1DClustersE();
1250     GroupClusters();
1251     SelectClusters();
1252     ResolveClustersE();
1253     GetRecPoints();
1254 }
1255 //_______________________________________________________________________
1256 void AliITSClusterFinderSDD::Print(){
1257     // Print SDD cluster finder Parameters
1258
1259     cout << "**************************************************" << endl;
1260     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1261     cout << "**************************************************" << endl;
1262     cout << "Number of Clusters: " << fNclusters << endl;
1263     cout << "Anode Tolerance: " << fDAnode << endl;
1264     cout << "Time  Tolerance: " << fDTime << endl;
1265     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1266     cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1267     cout << "Minimum Amplitude: " << fMinPeak << endl;
1268     cout << "Minimum Charge: " << fMinCharge << endl;
1269     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1270     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1271     cout << "**************************************************" << endl;
1272 }