1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
25 #include "AliITSClusterFinderSDD.h"
26 #include "AliITSMapA1.h"
28 #include "AliITSdigit.h"
29 #include "AliITSRawCluster.h"
30 #include "AliITSRecPoint.h"
31 #include "AliITSsegmentation.h"
32 #include "AliITSresponseSDD.h"
35 ClassImp(AliITSClusterFinderSDD)
37 //______________________________________________________________________
38 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSsegmentation *seg,
39 AliITSresponse *response,
42 // standard constructor
48 fNclusters = fClusters->GetEntriesFast();
57 fMap = new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
59 //______________________________________________________________________
60 AliITSClusterFinderSDD::AliITSClusterFinderSDD(){
61 // default constructor
72 SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
78 //____________________________________________________________________________
79 AliITSClusterFinderSDD::~AliITSClusterFinderSDD(){
84 //______________________________________________________________________
85 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma){
86 // set the signal threshold for cluster finder
87 Float_t baseline,noise,noise_after_el;
89 fResponse->GetNoiseParam(noise,baseline);
90 noise_after_el = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
91 fCutAmplitude = (Int_t)((baseline + nsigma*noise_after_el));
93 //______________________________________________________________________
94 void AliITSClusterFinderSDD::Find1DClusters(){
96 static AliITS *iTS = (AliITS*)gAlice->GetModule("ITS");
98 // retrieve the parameters
99 Int_t fNofMaps = fSegmentation->Npz();
100 Int_t fMaxNofSamples = fSegmentation->Npx();
101 Int_t fNofAnodes = fNofMaps/2;
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);
110 fMap->SetThreshold(fCutAmplitude);
115 fResponse->GetNoiseParam(noise,baseline);
117 Int_t nofFoundClusters = 0;
119 Float_t **dfadc = new Float_t*[fNofAnodes];
120 for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
126 for(k=0;k<fNofAnodes;k++) {
127 idx = j*fNofAnodes+k;
128 // signal (fadc) & derivative (dfadc)
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;
137 for(k=0;k<fNofAnodes;k++) {
138 //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
139 idx = j*fNofAnodes+k;
143 while(it <= fMaxNofSamples-3) {
147 Float_t fadcmax = 0.;
148 Float_t dfadcmax = 0.;
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) {
161 if(dfadc[k][id] > dfadcmax) {
162 dfadcmax = dfadc[k][id];
167 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
170 if(tstart < 0) tstart = 0;
172 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
175 Int_t tstop = tstart;
176 Float_t dfadcmin = 10000.;
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)) {
184 if(tstop > 255) tstop = 255;
185 dfadcmin = dfadc[k][it+ij];
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;
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;
201 clusterCharge += fadc;
202 // as a matter of fact we should take the peak
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);
214 clusterTime += fadc*its;
215 if(fadc > 0) clusterMult++;
217 clusterTime /= (clusterCharge/fTimeStep); // ns
218 if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
223 Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
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
231 clusterPeakAmplitude, //f
233 0.,0.,clusterDriftPath,//fff
234 clusteranodePath, //f
237 iTS->AddCluster(1,&clust);
245 for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
253 //______________________________________________________________________
254 void AliITSClusterFinderSDD::Find1DClustersE(){
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;
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 );
267 fResponse->GetNoiseParam( n, baseline );
270 fMap->SetThreshold( fCutAmplitude );
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;
285 Float_t anode = k+0.5;
287 for( Int_t l=0; l<fMaxNofSamples; l++ ){
288 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
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;
303 if( fadc > baseline ) fadc -= baseline;
310 Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
311 if( l > shift && l < (fMaxNofSamples-shift) )
312 peakpos = fMap->GetHitIndex( idx, l+shift );
314 peakpos = fMap->GetHitIndex( idx, l );
315 if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
320 // min # of timesteps for a RawCluster
321 // Found a RawCluster...
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,
333 start, stop, 1, k, k );
334 iTS->AddCluster( 1, &clust );
335 // clust.PrintInfo();
339 } // end if on==kTRUE
344 // cout << "# Rawclusters " << nClu << endl;
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
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] ){
369 peakAmp[npeak] = sxz;
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++ ){
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;
389 // make average of peak groups
390 for( i=0; i<npeak; i++ ){
392 if( flag[i] <= 0 ) continue;
393 for( j=0; j<npeak; j++ ){
395 if( flag[j] != flag[i] ) continue;
396 peakX[i] += peakX[j];
397 peakZ[i] += peakZ[j];
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];
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]
428 Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
429 const Int_t knParam = 5;
430 Int_t npeak = (Int_t)par[0];
432 memset( spe, 0, sizeof( Float_t )*zdim*xdim );
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;
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 );
453 cout << "Wrong SDD Electronics =" << electronics << endl;
455 } // end if electronicx
456 spe[x*zdim+z] += signal;
457 if( integral != 0 ) integral[i] += signal;
464 //__________________________________________________________________________
465 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
467 // EVALUATES UNNORMALIZED CHI-SQUARED
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];
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,
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++ ){
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 );
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
515 do { // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
518 mmm = nnn - (nnn/5)*5; // multiplo de 5
521 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
525 // Constrain paramiters
526 Int_t kpos = (k-1) % knParam;
529 if( param[k] <= 20 ) param[k] = fMinPeak;
532 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
535 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
538 if( param[k] < .5 ) param[k] = .5;
541 if( param[k] < .288 ) param[k] = .288; // 1/sqrt(12) = 0.288
542 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
545 PeakFunc( xdim, zdim, param, speFit );
546 chisq3 = ChiSqr( xdim, zdim, spe, speFit );
547 if( chisq3 < chisq2 && nnn < 50 ){
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);
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;
565 // Constrain paramiters
566 Int_t kpos = (k-1) % knParam;
569 if( param[k] <= 20 ) param[k] = fMinPeak;
572 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
575 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
578 if( param[k] < .5 ) param[k] = .5;
581 if( param[k] < .288 ) param[k] = .288; // 1/sqrt(12) = 0.288
582 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
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;
594 // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
595 PeakFunc( xdim, zdim, param, speFit );
596 *chisqr = ChiSqr( xdim, zdim, spe, speFit );
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];
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 );
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;
637 Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
638 reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
640 if( reldif < (float) kchilmt ){
641 *chir = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
646 if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
647 *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
652 if( iterNum > 5*knstop ){
653 *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
658 if( iterNum <= knel ) continue;
659 n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
660 if( n > 3 || n == 0 ) continue;
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);
678 if( fabs(prmin-tmp2) > fabs(dp) ) prmin = tmp2+dp;
680 step[k] = dp/10; // OPTIMIZE SEARCH STEP
693 //______________________________________________________________________
694 void AliITSClusterFinderSDD::ResolveClustersE(){
695 // The function to resolve clusters if the clusters overlapping exists
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();
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 );
710 fResponse->GetNoiseParam( n, baseline );
711 Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
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();
722 astart += fNofAnodes;
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) );
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;
737 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
742 // search peaks on cluster
743 const Int_t kNp = 150;
746 Float_t peakAmp1[kNp];
747 Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
749 // if multiple peaks, split cluster
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
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]
771 NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
776 Float_t peakAmp[kNp];
777 Float_t integral[kNp];
778 //get integrals => charge for each peak
779 PeakFunc( xdim, zdim, par, sp, integral );
781 for( i=0; i<npeak; i++ ){
782 peakAmp[i] = par[k1];
783 peakX[i] = par[k1+1];
784 peakZ[i] = par[k1+2];
786 sigma[i] = par[k1+4];
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) )
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 );
823 fClusters->RemoveAt( j );
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;
834 fClusters->Compress();
839 //________________________________________________________________________
840 void AliITSClusterFinderSDD::GroupClusters(){
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];
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);
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);
863 // clusterI->PrintInfo();
864 // clusterJ->PrintInfo();
865 clusterI->Add(clusterJ);
867 fClusters->RemoveAt(j);
872 fClusters->Compress();
877 //________________________________________________________________________
878 void AliITSClusterFinderSDD::SelectClusters(){
879 // get number of clusters for this module
880 Int_t nofClusters = fClusters->GetEntriesFast();
882 nofClusters -= fNclusters;
884 for(i=0; i<nofClusters; i++) {
885 AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
888 if(clusterI->Anodes() != 0.) {
889 wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
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);
899 fClusters->Compress();
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;
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);
919 fResponse->GetNoiseParam(n,baseline);
920 Float_t dzz_1A = anodePitch * anodePitch / 12;
921 // fill Map of signals
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);
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();
937 astart += fNofAnodes;
940 // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
941 // <<tstart<<","<<tstop<<endl;
942 // clear the digit arrays
943 for(ii=0; ii<400; ii++) {
949 for(ianode=astart; ianode<=astop; ianode++) {
950 for(itime=tstart; itime<=tstop; itime++) {
951 fadc=fMap->GetSignal(ianode,itime);
953 fadc-=(Double_t)baseline;
954 q[ndigits] = fadc*(fTimeStep/160); // KeV
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<<","
964 // cout<<"wing,anode,ndigits,charge ="<<wing<<","
965 // <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
970 // cout<<"fadc=0, ndigits ="<<ndigits<<endl;
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
983 Int_t nbins = ndigits;
985 // now, all lengths are in microns
986 for (ii=0; ii<nbins; 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];
1003 // shrink the cluster in the time direction proportionaly to the
1004 // dxx/dzz, which lineary depends from the drift path
1005 // new Ernesto........
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) );
1011 scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1014 scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1017 scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
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.);
1030 // dzz = zz - zm*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
1036 if (dxx < 0.) dxx=0.;
1037 // the data if no cluster overlapping (the coordunates are in cm)
1042 // if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1045 if (dxz==0.) tga=0.;
1047 tmp=0.5*(dzz-dxx)/dxz;
1048 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1049 tmp+TMath::Sqrt(tmp*tmp+1);
1051 elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1052 // change from microns to cm
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++) {
1065 x[i] = x[i] *= 1.e-4;
1066 z[i] = z[i] *= 1.e-4;
1068 // cout<<"!!! elps ="<<elps<<endl;
1069 if (elps < 0.3) { // try to separate hits
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;
1080 xxx += tmp*tmp*tmp*q[i];
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;
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;
1107 cout<<"*********** d=0 ***********\n";
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;
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 +
1126 qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
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);
1142 // cout<<" --------- i,xfiti,zfiti,qfiti ="<<i<<","
1143 // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1146 if(nfhits == 1 && separate == 1) {
1147 cout<<"!!!!! no separate"<<endl;
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,
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);
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,
1176 clusterPeakAmplitude,peakpos,
1177 0.,0.,clusterDriftPath,
1178 clusteranodePath,clusterJ->Samples()/2
1179 ,tstart,tstop,0,0,0,astart,astop);
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;
1187 fClusters->RemoveAt(j);
1190 fClusters->Compress();
1195 //______________________________________________________________________
1196 void AliITSClusterFinderSDD::GetRecPoints(){
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
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);
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");
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);
1241 // fMap->ClearMap();
1243 //______________________________________________________________________
1244 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1245 // find raw clusters
1255 //_______________________________________________________________________
1256 void AliITSClusterFinderSDD::Print(){
1257 // Print SDD cluster finder Parameters
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;