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   Revision 1.25  2002/05/10 22:29:40  nilsen
  19   Change my Massimo Masera in the default constructor to bring things into
  20   compliance.
  21
  22   Revision 1.24  2002/04/24 22:02:31  nilsen
  23   New SDigits and Digits routines, and related changes,  (including new
  24   noise values).
  25
  26  */
  27
  28 #include <iostream.h>
  29 #include <TFile.h>
  30 #include <TMath.h>
  31 #include <math.h>
  32
  33 #include "AliITSClusterFinderSDD.h"
  34 #include "AliITSMapA1.h"
  35 #include "AliITS.h"
  36 #include "AliITSdigit.h"
  37 #include "AliITSRawCluster.h"
  38 #include "AliITSRecPoint.h"
  39 #include "AliITSsegmentation.h"
  40 #include "AliITSresponseSDD.h"
  41 #include "AliRun.h"
  42
  43 ClassImp(AliITSClusterFinderSDD)
  44
  45 //______________________________________________________________________
  46 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSsegmentation *seg,
  47                                                AliITSresponse *response,
  48                                                TClonesArray *digits,
  49                                                TClonesArray *recp){
  50     // standard constructor
  51
  52     fSegmentation = seg;
  53     fResponse     = response;
  54     fDigits       = digits;
  55     fClusters     = recp;
  56     fNclusters    = fClusters->GetEntriesFast();
  57     SetCutAmplitude();
  58     SetDAnode();
  59     SetDTime();
  60     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
  61     //    SetMinPeak();
  62     SetMinNCells();
  63     SetMaxNCells();
  64     SetTimeCorr();
  65     SetMinCharge();
  66     fMap = new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
  67 }
  68 //______________________________________________________________________
  69 AliITSClusterFinderSDD::AliITSClusterFinderSDD(){
  70     // default constructor
  71
  72     fSegmentation = 0;
  73     fResponse     = 0;
  74     fDigits       = 0;
  75     fClusters     = 0;
  76     fNclusters    = 0;
  77     fMap          = 0;
  78     fCutAmplitude = 0;
  79     fDAnode = 0;
  80     fDTime = 0;
  81     fMinPeak = 0;
  82     fMinNCells = 0;
  83     fMaxNCells = 0;
  84     fTimeCorr = 0;
  85     fMinCharge = 0;
  86     /*
  87     SetDAnode();
  88     SetDTime();
  89     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
  90     SetMinNCells();
  91     SetMaxNCells();
  92     SetTimeCorr();
  93     SetMinCharge();
  94     */
  95 }
  96 //____________________________________________________________________________
  97 AliITSClusterFinderSDD::~AliITSClusterFinderSDD(){
  98     // destructor
  99
 100     if(fMap) delete fMap;
 101 }
 102 //______________________________________________________________________
 103 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma){
 104     // set the signal threshold for cluster finder
 105     Float_t baseline,noise,noise_after_el;
 106
 107     fResponse->GetNoiseParam(noise,baseline);
 108     noise_after_el = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
 109     fCutAmplitude = (Int_t)((baseline + nsigma*noise_after_el));
 110 }
 111 //______________________________________________________________________
 112 void AliITSClusterFinderSDD::Find1DClusters(){
 113     // find 1D clusters
 114     static AliITS *iTS = (AliITS*)gAlice->GetModule("ITS");
 115
 116     // retrieve the parameters
 117     Int_t fNofMaps       = fSegmentation->Npz();
 118     Int_t fMaxNofSamples = fSegmentation->Npx();
 119     Int_t fNofAnodes     = fNofMaps/2;
 120     Int_t dummy          = 0;
 121     Float_t fTimeStep    = fSegmentation->Dpx(dummy);
 122     Float_t fSddLength   = fSegmentation->Dx();
 123     Float_t fDriftSpeed  = fResponse->DriftSpeed();
 124     Float_t anodePitch   = fSegmentation->Dpz(dummy);
 125
 126     // map the signal
 127     fMap->ClearMap();
 128     fMap->SetThreshold(fCutAmplitude);
 129     fMap->FillMap();
 130
 131     Float_t noise;
 132     Float_t baseline;
 133     fResponse->GetNoiseParam(noise,baseline);
 134
 135     Int_t nofFoundClusters = 0;
 136     Int_t i;
 137     Float_t **dfadc = new Float_t*[fNofAnodes];
 138     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 139     Float_t fadc  = 0.;
 140     Float_t fadc1 = 0.;
 141     Float_t fadc2 = 0.;
 142     Int_t j,k,idx,l,m;
 143     for(j=0;j<2;j++) {
 144         for(k=0;k<fNofAnodes;k++) {
 145             idx = j*fNofAnodes+k;
 146             // signal (fadc) & derivative (dfadc)
 147             dfadc[k][255]=0.;
 148             for(l=0; l<fMaxNofSamples; l++) {
 149                 fadc2=(Float_t)fMap->GetSignal(idx,l);
 150                 if(l>0) fadc1=(Float_t)fMap->GetSignal(idx,l-1);
 151                 if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 152             } // samples
 153         } // anodes
 154
 155         for(k=0;k<fNofAnodes;k++) {
 156         //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 157             idx = j*fNofAnodes+k;
 158             Int_t imax  = 0;
 159             Int_t imaxd = 0;
 160             Int_t it    = 0;
 161             while(it <= fMaxNofSamples-3) {
 162                 imax  = it;
 163                 imaxd = it;
 164                 // maximum of signal
 165                 Float_t fadcmax  = 0.;
 166                 Float_t dfadcmax = 0.;
 167                 Int_t lthrmina   = 1;
 168                 Int_t lthrmint   = 3;
 169                 Int_t lthra      = 1;
 170                 Int_t lthrt      = 0;
 171                 for(m=0;m<20;m++) {
 172                     Int_t id = it+m;
 173                     if(id>=fMaxNofSamples) break;
 174                     fadc=(float)fMap->GetSignal(idx,id);
 175                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 176                     if(fadc > (float)fCutAmplitude) {
 177                         lthrt++;
 178                     } // end if
 179                     if(dfadc[k][id] > dfadcmax) {
 180                         dfadcmax = dfadc[k][id];
 181                         imaxd    = id;
 182                     } // end if
 183                 } // end for m
 184                 it = imaxd;
 185                 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 186                 // cluster charge
 187                 Int_t tstart = it-2;
 188                 if(tstart < 0) tstart = 0;
 189                 Bool_t ilcl = 0;
 190                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 191                 if(ilcl) {
 192                     nofFoundClusters++;
 193                     Int_t tstop      = tstart;
 194                     Float_t dfadcmin = 10000.;
 195                     Int_t ij;
 196                     for(ij=0; ij<20; ij++) {
 197                         if(tstart+ij > 255) { tstop = 255; break; }
 198                         fadc=(float)fMap->GetSignal(idx,tstart+ij);
 199                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 200                            (fadc > fCutAmplitude)) {
 201                             tstop = tstart+ij+5;
 202                             if(tstop > 255) tstop = 255;
 203                             dfadcmin = dfadc[k][it+ij];
 204                         } // end if
 205                     } // end for ij
 206
 207                     Float_t clusterCharge = 0.;
 208                     Float_t clusterAnode  = k+0.5;
 209                     Float_t clusterTime   = 0.;
 210                     Int_t   clusterMult   = 0;
 211                     Float_t clusterPeakAmplitude = 0.;
 212                     Int_t its,peakpos     = -1;
 213                     Float_t n, baseline;
 214                     fResponse->GetNoiseParam(n,baseline);
 215                     for(its=tstart; its<=tstop; its++) {
 216                         fadc=(float)fMap->GetSignal(idx,its);
 217                         if(fadc>baseline) fadc -= baseline;
 218                         else fadc = 0.;
 219                         clusterCharge += fadc;
 220                         // as a matter of fact we should take the peak
 221                         // pos before FFT
 222                         // to get the list of tracks !!!
 223                         if(fadc > clusterPeakAmplitude) {
 224                             clusterPeakAmplitude = fadc;
 225                             //peakpos=fMap->GetHitIndex(idx,its);
 226                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 227                             if(its>shift && its<(fMaxNofSamples-shift))
 228                                 peakpos  = fMap->GetHitIndex(idx,its+shift);
 229                             else peakpos = fMap->GetHitIndex(idx,its);
 230                             if(peakpos<0) peakpos =fMap->GetHitIndex(idx,its);
 231                         } // end if
 232                         clusterTime += fadc*its;
 233                         if(fadc > 0) clusterMult++;
 234                         if(its == tstop) {
 235                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 236                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 237                             //ns
 238                         } // end if
 239                     } // end for its
 240
 241                     Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 242                                                anodePitch;
 243                     Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 244                     clusterDriftPath = fSddLength-clusterDriftPath;
 245                     if(clusterCharge <= 0.) break;
 246                     AliITSRawClusterSDD clust(j+1,//i
 247                                               clusterAnode,clusterTime,//ff
 248                                               clusterCharge, //f
 249                                               clusterPeakAmplitude, //f
 250                                               peakpos, //i
 251                                               0.,0.,clusterDriftPath,//fff
 252                                               clusteranodePath, //f
 253                                               clusterMult, //i
 254                                               0,0,0,0,0,0,0);//7*i
 255                     iTS->AddCluster(1,&clust);
 256                     it = tstop;
 257                 } // ilcl
 258                 it++;
 259             } // while (samples)
 260         } // anodes
 261     } // detectors (2)
 262
 263     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 264     delete [] dfadc;
 265
 266     return;
 267 }
 268
 269
 270
 271 //______________________________________________________________________
 272 void AliITSClusterFinderSDD::Find1DClustersE(){
 273     // find 1D clusters
 274     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 275     // retrieve the parameters
 276     Int_t fNofMaps = fSegmentation->Npz();
 277     Int_t fMaxNofSamples = fSegmentation->Npx();
 278     Int_t fNofAnodes = fNofMaps/2;
 279     Int_t dummy=0;
 280     Float_t fTimeStep = fSegmentation->Dpx( dummy );
 281     Float_t fSddLength = fSegmentation->Dx();
 282     Float_t fDriftSpeed = fResponse->DriftSpeed();
 283     Float_t anodePitch = fSegmentation->Dpz( dummy );
 284     Float_t n, baseline;
 285     fResponse->GetNoiseParam( n, baseline );
 286     // map the signal
 287     fMap->ClearMap();
 288     fMap->SetThreshold( fCutAmplitude );
 289     fMap->FillMap();
 290
 291     Int_t nClu = 0;
 292     //        cout << "Search  cluster... "<< endl;
 293     for( Int_t j=0; j<2; j++ ){
 294         for( Int_t k=0; k<fNofAnodes; k++ ){
 295             Int_t idx = j*fNofAnodes+k;
 296             Bool_t on = kFALSE;
 297             Int_t start = 0;
 298             Int_t nTsteps = 0;
 299             Float_t fmax = 0.;
 300             Int_t lmax = 0;
 301             Float_t charge = 0.;
 302             Float_t time = 0.;
 303             Float_t anode = k+0.5;
 304             Int_t peakpos = -1;
 305             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 306                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 307                 if( fadc > 0.0 ){
 308                     if( on == kFALSE && l<fMaxNofSamples-4){
 309                         // star RawCluster (reset var.)
 310                         Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 311                         if( fadc1 < fadc ) continue;
 312                         start = l;
 313                         fmax = 0.;
 314                         lmax = 0;
 315                         time = 0.;
 316                         charge = 0.;
 317                         on = kTRUE;
 318                         nTsteps = 0;
 319                     } // end if on...
 320                     nTsteps++ ;
 321                     if( fadc > baseline ) fadc -= baseline;
 322                     else fadc=0.;
 323                     charge += fadc;
 324                     time += fadc*l;
 325                     if( fadc > fmax ){
 326                         fmax = fadc;
 327                         lmax = l;
 328                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 329                         if( l > shift && l < (fMaxNofSamples-shift) )
 330                             peakpos = fMap->GetHitIndex( idx, l+shift );
 331                         else
 332                             peakpos = fMap->GetHitIndex( idx, l );
 333                         if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
 334                     } // end if fadc
 335                 }else{ // end fadc>0
 336                     if( on == kTRUE ){
 337                         if( nTsteps > 2 ){
 338                             //  min # of timesteps for a RawCluster
 339                             // Found a RawCluster...
 340                             Int_t stop = l-1;
 341                             time /= (charge/fTimeStep);   // ns
 342                                 // time = lmax*fTimeStep;   // ns
 343                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 344                             Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 345                             Float_t driftPath = time*fDriftSpeed;
 346                             driftPath = fSddLength-driftPath;
 347                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 348                                                       fmax, peakpos,0.,0.,
 349                                                       driftPath,anodePath,
 350                                                       nTsteps,start,stop,
 351                                                       start, stop, 1, k, k );
 352                             iTS->AddCluster( 1, &clust );
 353                             //        clust.PrintInfo();
 354                             nClu++;
 355                         } // end if nTsteps
 356                         on = kFALSE;
 357                     } // end if on==kTRUE
 358                 } // end if fadc>0
 359             } // samples
 360         } // anodes
 361     } // wings
 362     //        cout << "# Rawclusters " << nClu << endl;
 363     return;
 364 }
 365 //_______________________________________________________________________
 366 Int_t AliITSClusterFinderSDD::SearchPeak(Float_t *spect,Int_t xdim,Int_t zdim,
 367                                          Int_t *peakX, Int_t *peakZ,
 368                                          Float_t *peakAmp, Float_t minpeak ){
 369     // search peaks on a 2D cluster
 370     Int_t npeak = 0;    // # peaks
 371     Int_t i,j;
 372     // search peaks
 373     for( Int_t z=1; z<zdim-1; z++ ){
 374         for( Int_t x=1; x<xdim-2; x++ ){
 375             Float_t sxz = spect[x*zdim+z];
 376             Float_t sxz1 = spect[(x+1)*zdim+z];
 377             Float_t sxz2 = spect[(x-1)*zdim+z];
 378             // search a local max. in s[x,z]
 379             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 380             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 381                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 382                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 383                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 384                 // peak found
 385                 peakX[npeak] = x;
 386                 peakZ[npeak] = z;
 387                 peakAmp[npeak] = sxz;
 388                 npeak++;
 389             } // end if ....
 390         } // end for x
 391     } // end for z
 392     // search groups of peaks with same amplitude.
 393     Int_t *flag = new Int_t[npeak];
 394     for( i=0; i<npeak; i++ ) flag[i] = 0;
 395     for( i=0; i<npeak; i++ ){
 396         for( j=0; j<npeak; j++ ){
 397             if( i==j) continue;
 398             if( flag[j] > 0 ) continue;
 399             if( peakAmp[i] == peakAmp[j] &&
 400                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 401                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 402                 if( flag[i] == 0) flag[i] = i+1;
 403                 flag[j] = flag[i];
 404             } // end if ...
 405         } // end for j
 406     } // end for i
 407     // make average of peak groups
 408     for( i=0; i<npeak; i++ ){
 409         Int_t nFlag = 1;
 410         if( flag[i] <= 0 ) continue;
 411         for( j=0; j<npeak; j++ ){
 412             if( i==j ) continue;
 413             if( flag[j] != flag[i] ) continue;
 414             peakX[i] += peakX[j];
 415             peakZ[i] += peakZ[j];
 416             nFlag++;
 417             npeak--;
 418             for( Int_t k=j; k<npeak; k++ ){
 419                 peakX[k] = peakX[k+1];
 420                 peakZ[k] = peakZ[k+1];
 421                 peakAmp[k] = peakAmp[k+1];
 422                 flag[k] = flag[k+1];
 423             } // end for k
 424             j--;
 425         } // end for j
 426         if( nFlag > 1 ){
 427             peakX[i] /= nFlag;
 428             peakZ[i] /= nFlag;
 429         } // end fi nFlag
 430     } // end for i
 431     delete [] flag;
 432     return( npeak );
 433 }
 434 //______________________________________________________________________
 435 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par,
 436                                        Float_t *spe, Float_t *integral){
 437     // function used to fit the clusters
 438     // par -> parameters..
 439     // par[0]  number of peaks.
 440     // for each peak i=1, ..., par[0]
 441     //                 par[i] = Ampl.
 442     //                 par[i+1] = xpos
 443     //                 par[i+2] = zpos
 444     //                 par[i+3] = tau
 445     //                 par[i+4] = sigma.
 446     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 447     const Int_t knParam = 5;
 448     Int_t npeak = (Int_t)par[0];
 449
 450     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 451
 452     Int_t k = 1;
 453     for( Int_t i=0; i<npeak; i++ ){
 454         if( integral != 0 ) integral[i] = 0.;
 455         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 456         Float_t T2 = par[k+3];   // PASCAL
 457         if( electronics == 2 ) { T2 *= T2; T2 *= 2; } // OLA
 458         for( Int_t z=0; z<zdim; z++ ){
 459             for( Int_t x=0; x<xdim; x++ ){
 460                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 461                 Float_t x2 = 0.;
 462                 Float_t signal = 0.;
 463                 if( electronics == 1 ){ // PASCAL
 464                     x2 = (x-par[k+1]+T2)/T2;
 465                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 466                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 467                 }else if( electronics == 2 ) { // OLA
 468                     x2 = (x-par[k+1])*(x-par[k+1])/T2;
 469                     signal = par[k]  * exp( -x2 - z2 );
 470                 } else {
 471                     cout << "Wrong SDD Electronics =" << electronics << endl;
 472                     // exit( 1 );
 473                 } // end if electronicx
 474                 spe[x*zdim+z] += signal;
 475                 if( integral != 0 ) integral[i] += signal;
 476             } // end for x
 477         } // end for z
 478         k += knParam;
 479     } // end for i
 480     return;
 481 }
 482 //__________________________________________________________________________
 483 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
 484                                         Float_t *speFit ){
 485     // EVALUATES UNNORMALIZED CHI-SQUARED
 486     Float_t chi2 = 0.;
 487     for( Int_t z=0; z<zdim; z++ ){
 488         for( Int_t x=1; x<xdim-1; x++ ){
 489             Int_t index = x*zdim+z;
 490             Float_t tmp = spe[index] - speFit[index];
 491             chi2 += tmp*tmp;
 492         } // end for x
 493     } // end for z
 494     return( chi2 );
 495 }
 496 //_______________________________________________________________________
 497 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param,
 498                                     Float_t *prm0,Float_t *steprm,
 499                                     Float_t *chisqr,Float_t *spe,
 500                                     Float_t *speFit ){
 501     //
 502     Int_t   k, nnn, mmm, i;
 503     Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 504     const Int_t knParam = 5;
 505     Int_t npeak = (Int_t)param[0];
 506     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 507     for( k=1; k<(npeak*knParam+1); k++ ){
 508         p1 = param[k];
 509         delta = steprm[k];
 510         d1 = delta;
 511         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 512         if( fabs( p1 ) > 1.0E-6 )
 513             if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 514             else  delta = (Float_t)1.0E-4;
 515         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 516         PeakFunc( xdim, zdim, param, speFit );
 517         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 518         p2 = p1+delta;
 519         param[k] = p2;
 520         PeakFunc( xdim, zdim, param, speFit );
 521         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 522         if( chisq1 < chisq2 ){
 523             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 524             delta = -delta;
 525             t = p1;
 526             p1 = p2;
 527             p2 = t;
 528             t = chisq1;
 529             chisq1 = chisq2;
 530             chisq2 = t;
 531         } // end if
 532         i = 1; nnn = 0;
 533         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 534             nnn++;
 535             p3 = p2 + delta;
 536             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 537             if( mmm == 0 ){
 538                 d1 = delta;
 539                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 540                 delta *= 5;
 541             } // end if
 542             param[k] = p3;
 543             // Constrain paramiters
 544             Int_t kpos = (k-1) % knParam;
 545             switch( kpos ){
 546             case 0 :
 547                 if( param[k] <= 20 ) param[k] = fMinPeak;
 548                 break;
 549             case 1 :
 550                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 551                 break;
 552             case 2 :
 553                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 554                 break;
 555             case 3 :
 556                 if( param[k] < .5 ) param[k] = .5;
 557                 break;
 558             case 4 :
 559                 if( param[k] < .288 ) param[k] = .288;        // 1/sqrt(12) = 0.288
 560                 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 561                 break;
 562             }; // end switch
 563             PeakFunc( xdim, zdim, param, speFit );
 564             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 565             if( chisq3 < chisq2 && nnn < 50 ){
 566                 p1 = p2;
 567                 p2 = p3;
 568                 chisq1 = chisq2;
 569                 chisq2 = chisq3;
 570             }else i=0;
 571         } while( i );
 572         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 573         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 574         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 575         if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 576         else p0 = 10000;
 577         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 578         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 579         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 580         //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 581         //if( fabs( p2-p0 ) > dp ) p0 = p2;
 582         param[k] = p0;
 583         // Constrain paramiters
 584         Int_t kpos = (k-1) % knParam;
 585         switch( kpos ){
 586         case 0 :
 587             if( param[k] <= 20 ) param[k] = fMinPeak;
 588             break;
 589         case 1 :
 590             if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 591             break;
 592         case 2 :
 593             if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 594             break;
 595         case 3 :
 596             if( param[k] < .5 ) param[k] = .5;
 597             break;
 598         case 4 :
 599             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 600             if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 601             break;
 602         }; // end switch
 603         PeakFunc( xdim, zdim, param, speFit );
 604         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 605         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 606         if( chisqt <= *chisqr ) *chisqr = chisqt;
 607         else param[k] = prm0[k];
 608         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 609         steprm[k] = (param[k]-prm0[k])/5;
 610         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 611     } // end for k
 612     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 613     PeakFunc( xdim, zdim, param, speFit );
 614     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 615     return;
 616 }
 617 //_________________________________________________________________________
 618 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 619                                            Float_t *param, Float_t *spe,
 620                                            Int_t *niter, Float_t *chir ){
 621     // fit method from Comput. Phys. Commun 46(1987) 149
 622     const Float_t kchilmt = 0.01;  //        relative accuracy
 623     const Int_t   knel = 3;        //        for parabolic minimization
 624     const Int_t   knstop = 50;     //        Max. iteration number
 625     const Int_t   knParam = 5;
 626     Int_t npeak = (Int_t)param[0];
 627     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 628     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 629     Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 630     Int_t   n, k, iterNum = 0;
 631     Float_t *prm0 = new Float_t[npeak*knParam+1];
 632     Float_t *step = new Float_t[npeak*knParam+1];
 633     Float_t *schi = new Float_t[npeak*knParam+1];
 634     Float_t *sprm[3];
 635     sprm[0] = new Float_t[npeak*knParam+1];
 636     sprm[1] = new Float_t[npeak*knParam+1];
 637     sprm[2] = new Float_t[npeak*knParam+1];
 638     Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 639     Float_t *speFit = new Float_t[ xdim*zdim ];
 640     PeakFunc( xdim, zdim, param, speFit );
 641     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 642     chi1 = chi0;
 643     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 644         for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 645             step[k] = param[k] / 20.0 ;
 646             step[k+1] = param[k+1] / 50.0;
 647             step[k+2] = param[k+2] / 50.0;
 648             step[k+3] = param[k+3] / 20.0;
 649             step[k+4] = param[k+4] / 20.0;
 650         } // end for k
 651     Int_t out = 0;
 652     do{
 653         iterNum++;
 654             chi0 = chi1;
 655             Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 656             reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 657         // EXIT conditions
 658         if( reldif < (float) kchilmt ){
 659             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 660             *niter = iterNum;
 661             out = 0;
 662             break;
 663         } // end if
 664         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 665             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 666             *niter = iterNum;
 667             out = 0;
 668             break;
 669         } // end if
 670         if( iterNum > 5*knstop ){
 671             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 672             *niter = iterNum;
 673             out = 1;
 674             break;
 675         } // end if
 676         if( iterNum <= knel ) continue;
 677         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 678         if( n > 3 || n == 0 ) continue;
 679         schi[n-1] = chi1;
 680         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 681         if( n != 3 ) continue;
 682         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 683         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 684         for( k=1; k<(npeak*knParam+1); k++ ){
 685             Float_t tmp0 = sprm[0][k];
 686             Float_t tmp1 = sprm[1][k];
 687             Float_t tmp2 = sprm[2][k];
 688             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 689             a += (schi[2]*(tmp0-tmp1));
 690             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 691             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 692                                              (tmp0*tmp0-tmp1*tmp1)));
 693             if ((double)a < 1.0E-6) prmin = 0;
 694             else prmin = (float) (0.5*b/a);
 695             dp = 5*(tmp2-tmp0);
 696             if( fabs(prmin-tmp2) > fabs(dp) ) prmin = tmp2+dp;
 697             param[k] = prmin;
 698             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 699         } // end for k
 700     } while( kTRUE );
 701     delete [] prm0;
 702     delete [] step;
 703     delete [] schi;
 704     delete [] sprm[0];
 705     delete [] sprm[1];
 706     delete [] sprm[2];
 707     delete [] speFit;
 708     return( out );
 709 }
 710
 711 //______________________________________________________________________
 712 void AliITSClusterFinderSDD::ResolveClustersE(){
 713     // The function to resolve clusters if the clusters overlapping exists
 714     Int_t i;
 715     static AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 716     // get number of clusters for this module
 717     Int_t nofClusters = fClusters->GetEntriesFast();
 718     nofClusters -= fNclusters;
 719     Int_t fNofMaps = fSegmentation->Npz();
 720     Int_t fNofAnodes = fNofMaps/2;
 721     Int_t fMaxNofSamples = fSegmentation->Npx();
 722     Int_t dummy=0;
 723     Double_t fTimeStep = fSegmentation->Dpx( dummy );
 724     Double_t fSddLength = fSegmentation->Dx();
 725     Double_t fDriftSpeed = fResponse->DriftSpeed();
 726     Double_t anodePitch = fSegmentation->Dpz( dummy );
 727     Float_t n, baseline;
 728     fResponse->GetNoiseParam( n, baseline );
 729     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 730
 731     for( Int_t j=0; j<nofClusters; j++ ){
 732         // get cluster information
 733         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 734         Int_t astart = clusterJ->Astart();
 735         Int_t astop = clusterJ->Astop();
 736         Int_t tstart = clusterJ->Tstartf();
 737         Int_t tstop = clusterJ->Tstopf();
 738         Int_t wing = (Int_t)clusterJ->W();
 739         if( wing == 2 ){
 740             astart += fNofAnodes;
 741             astop  += fNofAnodes;
 742         } // end if
 743         Int_t xdim = tstop-tstart+3;
 744         Int_t zdim = astop-astart+3;
 745         if(xdim > 50 || zdim > 30) { cout << "Warning: xdim: " << xdim << ", zdim: " << zdim << endl; continue; }
 746         Float_t *sp = new Float_t[ xdim*zdim+1 ];
 747         memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 748
 749         // make a local map from cluster region
 750         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 751             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 752                 Float_t fadc = fMap->GetSignal( ianode, itime );
 753                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 754                 else fadc = 0.;
 755                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 756                 sp[index] = fadc;
 757             } // time loop
 758         } // anode loop
 759
 760         // search peaks on cluster
 761         const Int_t kNp = 150;
 762         Int_t peakX1[kNp];
 763         Int_t peakZ1[kNp];
 764         Float_t peakAmp1[kNp];
 765         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 766
 767         // if multiple peaks, split cluster
 768         if( npeak >= 1 )
 769         {
 770             //        cout << "npeak " << npeak << endl;
 771             //        clusterJ->PrintInfo();
 772             Float_t *par = new Float_t[npeak*5+1];
 773             par[0] = (Float_t)npeak;
 774             // Initial parameters in cell dimentions
 775             Int_t k1 = 1;
 776             for( i=0; i<npeak; i++ ){
 777                 par[k1] = peakAmp1[i];
 778                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 779                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 780                 if( electronics == 1 )
 781                     par[k1+3] = 2.; // PASCAL
 782                 else if( electronics == 2 )
 783                     par[k1+3] = 0.7; // tau [timebin]  OLA
 784                 par[k1+4] = .4;    // sigma        [anodepich]
 785                 k1+=5;
 786             } // end for i
 787             Int_t niter;
 788             Float_t chir;
 789             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 790             Float_t peakX[kNp];
 791             Float_t peakZ[kNp];
 792             Float_t sigma[kNp];
 793             Float_t tau[kNp];
 794             Float_t peakAmp[kNp];
 795             Float_t integral[kNp];
 796             //get integrals => charge for each peak
 797             PeakFunc( xdim, zdim, par, sp, integral );
 798             k1 = 1;
 799             for( i=0; i<npeak; i++ ){
 800                 peakAmp[i] = par[k1];
 801                 peakX[i] = par[k1+1];
 802                 peakZ[i] = par[k1+2];
 803                 tau[i] = par[k1+3];
 804                 sigma[i] = par[k1+4];
 805                 k1+=5;
 806             } // end for i
 807             // calculate parameter for new clusters
 808             for( i=0; i<npeak; i++ ){
 809                 AliITSRawClusterSDD clusterI( *clusterJ );
 810                 Int_t newAnode = peakZ1[i]-1 + astart;
 811                 Int_t newiTime = peakX1[i]-1 + tstart;
 812                 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 813                 if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )
 814                     shift = 0;
 815                 Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 816                 clusterI.SetPeakPos( peakpos );
 817                 clusterI.SetPeakAmpl( peakAmp1[i] );
 818                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 819                 Float_t newiTimef = peakX[i] - 1 + tstart;
 820                 if( wing == 2 ) newAnodef -= fNofAnodes;
 821                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 822                 newiTimef *= fTimeStep;
 823                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 824                 if( electronics == 1 ){
 825                 //    newiTimef *= 0.999438;    // PASCAL
 826                 //    newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 827                 }else if( electronics == 2 )
 828                     newiTimef *= 0.99714;    // OLA
 829                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 830                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 831                 clusterI.SetX( driftPath*sign * 0.0001 );
 832                 clusterI.SetZ( anodePath * 0.0001 );
 833                 clusterI.SetAnode( newAnodef );
 834                 clusterI.SetTime( newiTimef );
 835                 clusterI.SetAsigma( sigma[i]*anodePitch );
 836                 clusterI.SetTsigma( tau[i]*fTimeStep );
 837                 clusterI.SetQ( integral[i] );
 838                 //    clusterI.PrintInfo();
 839                 iTS->AddCluster( 1, &clusterI );
 840             } // end for i
 841             fClusters->RemoveAt( j );
 842             delete [] par;
 843         } else {  // something odd
 844             cout << " --- Peak not found!!!!  minpeak=" << fMinPeak<<
 845                     " cluster peak=" << clusterJ->PeakAmpl() <<
 846                     " module=" << fModule << endl;
 847             clusterJ->PrintInfo();
 848             cout << " xdim=" << xdim-2 << " zdim=" << zdim-2 << endl << endl;
 849         }
 850         delete [] sp;
 851     } // cluster loop
 852     fClusters->Compress();
 853 //    fMap->ClearMap();
 854 }
 855
 856
 857 //________________________________________________________________________
 858 void  AliITSClusterFinderSDD::GroupClusters(){
 859     // group clusters
 860     Int_t dummy=0;
 861     Float_t fTimeStep = fSegmentation->Dpx(dummy);
 862     // get number of clusters for this module
 863     Int_t nofClusters = fClusters->GetEntriesFast();
 864     nofClusters -= fNclusters;
 865     AliITSRawClusterSDD *clusterI;
 866     AliITSRawClusterSDD *clusterJ;
 867     Int_t *label = new Int_t [nofClusters];
 868     Int_t i,j;
 869     for(i=0; i<nofClusters; i++) label[i] = 0;
 870     for(i=0; i<nofClusters; i++) {
 871         if(label[i] != 0) continue;
 872         for(j=i+1; j<nofClusters; j++) {
 873             if(label[j] != 0) continue;
 874             clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 875             clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 876             // 1.3 good
 877             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 878             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 879             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 880             if(!pair) continue;
 881             //      clusterI->PrintInfo();
 882             //      clusterJ->PrintInfo();
 883             clusterI->Add(clusterJ);
 884             label[j] = 1;
 885             fClusters->RemoveAt(j);
 886             j=i; // <- Ernesto
 887         } // J clusters
 888         label[i] = 1;
 889     } // I clusters
 890     fClusters->Compress();
 891
 892     delete [] label;
 893     return;
 894 }
 895 //________________________________________________________________________
 896 void AliITSClusterFinderSDD::SelectClusters(){
 897     // get number of clusters for this module
 898     Int_t nofClusters = fClusters->GetEntriesFast();
 899
 900     nofClusters -= fNclusters;
 901     Int_t i;
 902     for(i=0; i<nofClusters; i++) {
 903         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
 904         Int_t rmflg = 0;
 905         Float_t wy = 0.;
 906         if(clusterI->Anodes() != 0.) {
 907             wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
 908         } // end if
 909         Int_t amp = (Int_t) clusterI->PeakAmpl();
 910         Int_t cha = (Int_t) clusterI->Q();
 911         if(amp < fMinPeak) rmflg = 1;
 912         if(cha < fMinCharge) rmflg = 1;
 913         if(wy < fMinNCells) rmflg = 1;
 914         //if(wy > fMaxNCells) rmflg = 1;
 915         if(rmflg) fClusters->RemoveAt(i);
 916     } // I clusters
 917     fClusters->Compress();
 918     return;
 919 }
 920 //__________________________________________________________________________
 921 void AliITSClusterFinderSDD::ResolveClusters(){
 922     // The function to resolve clusters if the clusters overlapping exists
 923 /*    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 924     // get number of clusters for this module
 925     Int_t nofClusters = fClusters->GetEntriesFast();
 926     nofClusters -= fNclusters;
 927     //cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","
 928     // <<fNclusters<<endl;
 929     Int_t fNofMaps = fSegmentation->Npz();
 930     Int_t fNofAnodes = fNofMaps/2;
 931     Int_t dummy=0;
 932     Double_t fTimeStep = fSegmentation->Dpx(dummy);
 933     Double_t fSddLength = fSegmentation->Dx();
 934     Double_t fDriftSpeed = fResponse->DriftSpeed();
 935     Double_t anodePitch = fSegmentation->Dpz(dummy);
 936     Float_t n, baseline;
 937     fResponse->GetNoiseParam(n,baseline);
 938     Float_t dzz_1A = anodePitch * anodePitch / 12;
 939     // fill Map of signals
 940     fMap->FillMap();
 941     Int_t j,i,ii,ianode,anode,itime;
 942     Int_t wing,astart,astop,tstart,tstop,nanode;
 943     Double_t fadc,ClusterTime;
 944     Double_t q[400],x[400],z[400]; // digit charges and coordinates
 945     for(j=0; j<nofClusters; j++) {
 946         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 947         Int_t ndigits = 0;
 948         astart=clusterJ->Astart();
 949         astop=clusterJ->Astop();
 950         tstart=clusterJ->Tstartf();
 951         tstop=clusterJ->Tstopf();
 952         nanode=clusterJ->Anodes();  // <- Ernesto
 953         wing=(Int_t)clusterJ->W();
 954         if(wing == 2) {
 955             astart += fNofAnodes;
 956             astop  += fNofAnodes;
 957         }  // end if
 958         // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
 959         //      <<tstart<<","<<tstop<<endl;
 960         // clear the digit arrays
 961         for(ii=0; ii<400; ii++) {
 962             q[ii] = 0.;
 963             x[ii] = 0.;
 964             z[ii] = 0.;
 965         } // end for ii
 966
 967         for(ianode=astart; ianode<=astop; ianode++) {
 968             for(itime=tstart; itime<=tstop; itime++) {
 969                 fadc=fMap->GetSignal(ianode,itime);
 970                 if(fadc>baseline) {
 971                     fadc-=(Double_t)baseline;
 972                     q[ndigits] = fadc*(fTimeStep/160);  // KeV
 973                     anode = ianode;
 974                     if(wing == 2) anode -= fNofAnodes;
 975                     z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
 976                     ClusterTime = itime*fTimeStep;
 977                     if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;// ns
 978                     x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
 979                     if(wing == 1) x[ndigits] *= (-1);
 980                     // cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","
 981                     //     <<fadc<<endl;
 982                     // cout<<"wing,anode,ndigits,charge ="<<wing<<","
 983                     //      <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
 984                     ndigits++;
 985                     continue;
 986                 } //  end if
 987                 fadc=0;
 988                 //              cout<<"fadc=0, ndigits ="<<ndigits<<endl;
 989             } // time loop
 990         } // anode loop
 991         //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
 992         // Fit cluster to resolve for two separate ones --------------------
 993         Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
 994         Double_t dxx=0., dzz=0., dxz=0.;
 995         Double_t scl = 0., tmp, tga, elps = -1.;
 996         Double_t xfit[2], zfit[2], qfit[2];
 997         Double_t pitchz = anodePitch*1.e-4;             // cm
 998         Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
 999         Double_t sigma2;
1000         Int_t nfhits;
1001         Int_t nbins = ndigits;
1002         Int_t separate = 0;
1003         // now, all lengths are in microns
1004         for (ii=0; ii<nbins; ii++) {
1005             qq += q[ii];
1006             xm += x[ii]*q[ii];
1007             zm += z[ii]*q[ii];
1008             xx += x[ii]*x[ii]*q[ii];
1009             zz += z[ii]*z[ii]*q[ii];
1010             xz += x[ii]*z[ii]*q[ii];
1011         } // end for ii
1012         xm /= qq;
1013         zm /= qq;
1014         xx /= qq;
1015         zz /= qq;
1016         xz /= qq;
1017         dxx = xx - xm*xm;
1018         dzz = zz - zm*zm;
1019         dxz = xz - xm*zm;
1020
1021         // shrink the cluster in the time direction proportionaly to the
1022         // dxx/dzz, which lineary depends from the drift path
1023         // new  Ernesto........
1024         if( nanode == 1 ){
1025             dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
1026             scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
1027         } // end if
1028         if( nanode == 2 ){
1029             scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1030         } // end if
1031         if( nanode == 3 ){
1032             scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1033         } // end if
1034         if( nanode > 3 ){
1035             scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
1036         } // end if
1037         //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","
1038         //  <<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
1039         //  old Boris.........
1040         //  tmp=29730. - 585.*fabs(xm/1000.);
1041         //  scl=TMath::Sqrt(tmp/130000.);
1042
1043         xm *= scl;
1044         xx *= scl*scl;
1045         xz *= scl;
1046
1047         dxx = xx - xm*xm;
1048         //   dzz = zz - zm*zm;
1049         dxz = xz - xm*zm;
1050         //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1051         // <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1052         // if(dzz < 7200.) dzz=7200.;//for one anode cluster dzz = anode**2/12
1053
1054         if (dxx < 0.) dxx=0.;
1055         // the data if no cluster overlapping (the coordunates are in cm)
1056         nfhits = 1;
1057         xfit[0] = xm*1.e-4;
1058         zfit[0] = zm*1.e-4;
1059         qfit[0] = qq;
1060         //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1061
1062         if (nbins >= 7) {
1063             if (dxz==0.) tga=0.;
1064             else {
1065                 tmp=0.5*(dzz-dxx)/dxz;
1066                 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1067                                                    tmp+TMath::Sqrt(tmp*tmp+1);
1068             } // end if dxz
1069             elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1070             // change from microns to cm
1071             xm *= 1.e-4;
1072             zm *= 1.e-4;
1073             zz *= 1.e-8;
1074             xx *= 1.e-8;
1075             xz *= 1.e-8;
1076             dxz *= 1.e-8;
1077             dxx *= 1.e-8;
1078             dzz *= 1.e-8;
1079             //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1080             //  <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1081             for (i=0; i<nbins; i++) {
1082                 x[i] = x[i] *= scl;
1083                 x[i] = x[i] *= 1.e-4;
1084                 z[i] = z[i] *= 1.e-4;
1085             } // end for i
1086             //     cout<<"!!! elps ="<<elps<<endl;
1087             if (elps < 0.3) { // try to separate hits
1088                 separate = 1;
1089                 tmp=atan(tga);
1090                 Double_t cosa=cos(tmp),sina=sin(tmp);
1091                 Double_t a1=0., x1=0., xxx=0.;
1092                 for (i=0; i<nbins; i++) {
1093                     tmp=x[i]*cosa + z[i]*sina;
1094                     if (q[i] > a1) {
1095                         a1=q[i];
1096                         x1=tmp;
1097                     } // end if
1098                     xxx += tmp*tmp*tmp*q[i];
1099                 } // end for i
1100                 xxx /= qq;
1101                 Double_t z12=-sina*xm + cosa*zm;
1102                 sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1103                 xm=cosa*xm + sina*zm;
1104                 xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1105                 Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1106                 Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1107                 for (i=0; i<33; i++) { // solve a system of equations
1108                     Double_t x1_old=x1, x2_old=x2, r_old=r;
1109                     Double_t c11=x1-x2;
1110                     Double_t c12=r;
1111                     Double_t c13=1-r;
1112                     Double_t c21=x1*x1 - x2*x2;
1113                     Double_t c22=2*r*x1;
1114                     Double_t c23=2*(1-r)*x2;
1115                     Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1116                     Double_t c32=3*r*(sigma2 + x1*x1);
1117                     Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1118                     Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1119                     Double_t f2=-(r*(sigma2+x1*x1)+(1-r)*(sigma2+x2*x2)- xx);
1120                     Double_t f3=-(r*x1*(3*sigma2+x1*x1)+(1-r)*x2*
1121                                                          (3*sigma2+x2*x2)-xxx);
1122                     Double_t d=c11*c22*c33+c21*c32*c13+c12*c23*c31-
1123                                        c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1124                     if (d==0.) {
1125                         cout<<"*********** d=0 ***********\n";
1126                         break;
1127                     } // end if
1128                     Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1129                         f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1130                     Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1131                         c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1132                     Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1133                         c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1134                     r  += dr/d;
1135                     x1 += d1/d;
1136                     x2 += d2/d;
1137                     if (fabs(x1-x1_old) > 0.0001) continue;
1138                     if (fabs(x2-x2_old) > 0.0001) continue;
1139                     if (fabs(r-r_old)/5 > 0.001) continue;
1140                     a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1141                     Double_t a2=a1*(1-r)/r;
1142                     qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina +
1143                                                                 z12*cosa;
1144                     qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
1145                                                                 z12*cosa;
1146                     nfhits=2;
1147                     break; // Ok !
1148                 } // end for i
1149                 if (i==33) cerr<<"No more iterations ! "<<endl;
1150             } // end of attempt to separate overlapped clusters
1151         } // end of nbins cut
1152         if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1153         if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="
1154                                                      <<elps<<","<<nfhits<<endl;
1155         if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1156         for (i=0; i<nfhits; i++) {
1157             xfit[i] *= (1.e+4/scl);
1158             if(wing == 1) xfit[i] *= (-1);
1159             zfit[i] *= 1.e+4;
1160             //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","
1161             // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1162         } // end for i
1163         Int_t ncl = nfhits;
1164         if(nfhits == 1 && separate == 1) {
1165             cout<<"!!!!! no separate"<<endl;
1166             ncl = -2;
1167         }  // end if
1168         if(nfhits == 2) {
1169             cout << "Split cluster: " << endl;
1170             clusterJ->PrintInfo();
1171             cout << " in: " << endl;
1172             for (i=0; i<nfhits; i++) {
1173                 // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,
1174                                                -1,-1,(Float_t)qfit[i],ncl,0,0,
1175                                                (Float_t)xfit[i],
1176                                                (Float_t)zfit[i],0,0,0,0,
1177                                                 tstart,tstop,astart,astop);
1178             //        AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,
1179             //                                 -1,(Float_t)qfit[i],0,0,0,
1180             //                                  (Float_t)xfit[i],
1181             //                                  (Float_t)zfit[i],0,0,0,0,
1182             //                                  tstart,tstop,astart,astop,ncl);
1183             // ???????????
1184             // if(wing == 1) xfit[i] *= (-1);
1185             Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1186             Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1187             Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1188             Float_t peakpos = clusterJ->PeakPos();
1189             Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1190             Float_t clusterDriftPath = Time*fDriftSpeed;
1191             clusterDriftPath = fSddLength-clusterDriftPath;
1192             AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,
1193                                                                  Time,qfit[i],
1194                                                clusterPeakAmplitude,peakpos,
1195                                                0.,0.,clusterDriftPath,
1196                                          clusteranodePath,clusterJ->Samples()/2
1197                                     ,tstart,tstop,0,0,0,astart,astop);
1198             clust->PrintInfo();
1199             iTS->AddCluster(1,clust);
1200             //        cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="
1201             // <<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]
1202             // <<","<<ncl<<endl;
1203             delete clust;
1204         }// nfhits loop
1205         fClusters->RemoveAt(j);
1206     } // if nfhits = 2
1207 } // cluster loop
1208 fClusters->Compress();
1209 fMap->ClearMap();
1210 */
1211     return;
1212 }
1213 //______________________________________________________________________
1214 void AliITSClusterFinderSDD::GetRecPoints(){
1215     // get rec points
1216     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1217     // get number of clusters for this module
1218     Int_t nofClusters = fClusters->GetEntriesFast();
1219     nofClusters -= fNclusters;
1220     const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1221     const Float_t kconv = 1.0e-4;
1222     const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1223     const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1224     Int_t i,j;
1225     Int_t ix, iz, idx=-1;
1226     AliITSdigitSDD *dig=0;
1227     Int_t ndigits=fDigits->GetEntriesFast();
1228     for(i=0; i<nofClusters; i++) {
1229         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1230         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1231         if(clusterI) idx=clusterI->PeakPos();
1232         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1233         // try peak neighbours - to be done
1234         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1235         if(!dig) {
1236             // try cog
1237             fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1238             dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1239             // if null try neighbours
1240             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1241             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1242             if (!dig) printf("SDD: cannot assign the track number!\n");
1243         } //  end if !dig
1244         AliITSRecPoint rnew;
1245         rnew.SetX(clusterI->X());
1246         rnew.SetZ(clusterI->Z());
1247         rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1248         rnew.SetdEdX(kconvGeV*clusterI->Q());
1249         rnew.SetSigmaX2(kRMSx*kRMSx);
1250         rnew.SetSigmaZ2(kRMSz*kRMSz);
1251         if(dig){
1252             rnew.fTracks[0] = dig->fTracks[0];
1253             rnew.fTracks[1] = -3;
1254             rnew.fTracks[2] = -3;
1255             j=1;
1256             while(rnew.fTracks[0]==dig->fTracks[j] &&
1257                   j<dig->GetNTracks()) j++;
1258             if(j<dig->GetNTracks()){
1259                 rnew.fTracks[1] = dig->fTracks[j];
1260                 while(rnew.fTracks[1]==dig->fTracks[j] &&
1261                       j<dig->GetNTracks()) j++;
1262                 if(j<dig->GetNTracks()) rnew.fTracks[2] = dig->fTracks[j];
1263             } // end if
1264         } // end if
1265         //printf("SDD: i %d track1 track2 track3 %d %d %d x y %f %f\n",
1266         //         i,rnew.fTracks[0],rnew.fTracks[1],rnew.fTracks[2],c
1267         //         lusterI->X(),clusterI->Z());
1268         iTS->AddRecPoint(rnew);
1269     } // I clusters
1270 //    fMap->ClearMap();
1271 }
1272 //______________________________________________________________________
1273 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1274     // find raw clusters
1275
1276     fModule = mod;
1277
1278     Find1DClustersE();
1279     GroupClusters();
1280     SelectClusters();
1281     ResolveClustersE();
1282     GetRecPoints();
1283 }
1284 //_______________________________________________________________________
1285 void AliITSClusterFinderSDD::Print(){
1286     // Print SDD cluster finder Parameters
1287
1288     cout << "**************************************************" << endl;
1289     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1290     cout << "**************************************************" << endl;
1291     cout << "Number of Clusters: " << fNclusters << endl;
1292     cout << "Anode Tolerance: " << fDAnode << endl;
1293     cout << "Time  Tolerance: " << fDTime << endl;
1294     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1295     cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1296     cout << "Minimum Amplitude: " << fMinPeak << endl;
1297     cout << "Minimum Charge: " << fMinCharge << endl;
1298     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1299     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1300     cout << "**************************************************" << endl;
1301 }