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 **************************************************************************/
18 Revision 1.9 2001/02/13 20:38:48 jbarbosa
19 Changes to make it work with new IO.
21 Revision 1.8 2000/11/01 15:37:18 jbarbosa
22 Updated to use its own rec. point object.
24 Revision 1.7 2000/10/03 21:44:09 morsch
25 Use AliSegmentation and AliHit abstract base classes.
27 Revision 1.6 2000/10/02 21:28:12 fca
28 Removal of useless dependecies via forward declarations
30 Revision 1.5 2000/10/02 15:50:25 jbarbosa
31 Fixed forward declarations.
33 Revision 1.4 2000/06/30 16:33:43 dibari
34 Several changes (ring drawing, fiducial selection, etc.)
36 Revision 1.3 2000/06/15 15:47:12 jbarbosa
37 Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
39 Revision 1.2 2000/06/12 15:26:09 jbarbosa
42 Revision 1.1 2000/06/09 14:53:01 jbarbosa
43 Bari's pattern recognition algorithm
47 #include "AliRICHHit.h"
48 #include "AliRICHCerenkov.h"
49 #include "AliRICHSDigit.h"
50 #include "AliRICHDigit.h"
51 #include "AliRICHRawCluster.h"
52 #include "AliRICHRecHit1D.h"
54 #include "AliDetector.h"
56 #include "AliRICHPoints.h"
57 #include "AliSegmentation.h"
58 #include "AliRICHPatRec.h"
60 #include "AliRICHConst.h"
61 #include "AliRICHPoints.h"
63 #include "AliHitMap.h"
65 #include <TParticle.h>
73 ClassImp(AliRICHPatRec)
74 //___________________________________________
75 AliRICHPatRec::AliRICHPatRec() : TObject()
77 // Default constructor
81 //___________________________________________
82 AliRICHPatRec::AliRICHPatRec(const char *name, const char *title)
85 //Constructor for Bari's pattern recogniton method object
88 void AliRICHPatRec::PatRec()
91 // Pattern recognition algorithm
93 AliRICHChamber* iChamber;
94 AliSegmentation* segmentation;
96 Int_t ntracks, ndigits[kNCH];
102 Int_t padsUsedX[100];
103 Int_t padsUsedY[100];
107 printf("PatRec started\n");
109 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
110 TTree *treeH = gAlice->TreeH();
112 ntracks =(Int_t) treeH->GetEntries();
114 for (itr=0; itr<ntracks; itr++) {
116 status = TrackParam(itr,ich);
117 if(status==1) continue;
118 //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi);
119 // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.);
121 iChamber = &(pRICH->Chamber(ich));
122 segmentation=iChamber->GetSegmentationModel();
124 nent=(Int_t)gAlice->TreeD()->GetEntries();
125 gAlice->TreeD()->GetEvent(1);
126 TClonesArray *pDigitss = pRICH->DigitsAddress(ich);
127 ndigits[ich] = pDigitss->GetEntriesFast();
128 printf("Digits in chamber %d: %d\n",ich,ndigits[ich]);
129 AliRICHDigit *padI = 0;
133 for (Int_t dig=0;dig<ndigits[ich];dig++) {
134 padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig);
138 segmentation->GetPadC(x,y,rx,ry,rz);
140 //printf("Pad coordinates x:%d, Real coordinates x:%f\n",x,rx);
141 //printf("Pad coordinates y:%d, Real coordinates y:%f\n",y,ry);
147 fCerenkovAnglePad = PhotonCerenkovAngle();
148 if(fCerenkovAnglePad==-999) continue;
150 if(!PhotonInBand()) continue;
155 segmentation->GetPadI(fXpad,fYpad,0,xpad,ypad);
157 padsUsedX[goodPhotons]=xpad;
158 padsUsedY[goodPhotons]=ypad;
161 fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad;
163 fNumEtaPhotons = goodPhotons;
165 BackgroundEstimation();
168 //CerenkovRingDrawing();
172 rechit[2] = fThetaCerenkov;
173 rechit[3] = fXshift + fTrackLoc[0];
174 rechit[4] = fYshift + fTrackLoc[1];
175 rechit[5] = fEmissPoint;
176 rechit[6] = goodPhotons;
178 //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]);
180 pRICH->AddRecHit1D(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY);
184 gAlice->TreeR()->Fill();
186 for (i=0;i<kNCH;i++) {
187 fRec=pRICH->RecHitsAddress1D(i);
188 int ndig=fRec->GetEntriesFast();
189 printf ("Chamber %d, rings %d\n",i,ndig);
191 pRICH->ResetRecHits1D();
196 Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich)
198 // Get Local coordinates of track impact
200 AliRICHChamber* iChamber;
201 AliSegmentation* segmentation;
203 Float_t trackglob[3];
211 //printf("Calling TrackParam\n");
214 TTree *treeH = gAlice->TreeH();
215 treeH->GetEvent(itr);
217 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
218 AliRICHHit* mHit=(AliRICHHit*)pRICH->FirstHit(-1);
219 if(mHit==0) return 1;
220 ich = mHit->fChamber-1;
221 trackglob[0] = mHit->X();
222 trackglob[1] = mHit->Y();
223 trackglob[2] = mHit->Z();
227 fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2));
228 thetatr = (mHit->fTheta)*(Float_t)kDegrad;
229 phitr = mHit->fPhi*(Float_t)kDegrad;
231 part = mHit->fParticle;
233 iChamber = &(pRICH->Chamber(ich));
234 iChamber->GlobaltoLocal(trackglob,trackloc);
236 segmentation=iChamber->GetSegmentationModel();
238 // retrieve geometrical params
240 AliRICHGeometry* fGeometry=iChamber->GetGeometryModel();
242 fRw = fGeometry->GetFreonThickness();
243 fQw = fGeometry->GetQuartzThickness();
244 fTgap = fGeometry->GetGapThickness();
245 Float_t radiatorToPads= fGeometry->GetRadiatorToPads();
246 //+ fGeometry->GetProximityGapThickness();
248 //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap);
250 //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr);
251 Float_t apar = radiatorToPads*tan(thetatr);
252 fTrackLoc[0] = apar*cos(phitr);
253 fTrackLoc[1] = apar*sin(phitr);
254 //fTrackLoc[2] = fRw + fQw + fTgap;
255 fTrackLoc[2] = radiatorToPads;
256 fTrackTheta = thetatr;
259 fXshift = trackloc[0] - fTrackLoc[0];
260 fYshift = trackloc[2] - fTrackLoc[1];
265 Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius,
269 // Estimation of emission point
271 Float_t nquartz = 1.585;
273 Float_t nfreon = 1.295;
276 // printf("Calling EstimationLimits\n");
278 Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta);
279 Float_t b1 = (fRw-fEmissPoint)*tan(lim);
280 Float_t b2 = fQw / sqrt(TMath::Power(nquartz,2)-TMath::Power(nfreon*sin(lim),2));
281 Float_t b3 = fTgap / sqrt(TMath::Power(ngas,2)-TMath::Power(nfreon*sin(lim),2));
282 Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3);
283 value = TMath::Power(radius,2)
284 -TMath::Power((apar*cos(fTrackPhi)-bpar*cos(phiphot)),2)
285 -TMath::Power((apar*sin(fTrackPhi)-bpar*sin(phiphot)),2);
290 Float_t AliRICHPatRec::PhotonCerenkovAngle()
292 // Cherenkov pad angle reconstruction
296 Float_t cherMax = 0.8;
298 Float_t eps = 0.0001;
299 Int_t niterEmiss = 0;
300 Int_t niterEmissMax = 0;
301 Float_t x1,x2,x3=0,p1,p2,p3;
305 // printf("Calling PhotonCerenkovAngle\n");
307 radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2));
308 fEmissPoint = fRw/2.; //Start value of EmissionPoint
310 while(niterEmiss<=niterEmissMax) {
313 argY = fYpad - fEmissPoint*tan(fTrackTheta)*sin(fTrackPhi);
314 argX = fXpad - fEmissPoint*tan(fTrackTheta)*cos(fTrackPhi);
315 phiphot = atan2(argY,argX);
316 p1 = EstimationAtLimits(cherMin,radius,phiphot);
317 p2 = EstimationAtLimits(cherMax,radius,phiphot);
320 // printf("PhotonCerenkovAngle failed\n");
324 //start to find the Cherenkov pad angle
328 p3 = EstimationAtLimits(x3,radius,phiphot);
329 while(TMath::Abs(p3)>eps){
333 p1 = EstimationAtLimits(x1,radius,phiphot);
336 p3 = EstimationAtLimits(x3,radius,phiphot);
340 // printf(" max iterations in PhotonCerenkovAngle\n");
344 // printf("niterFun %i \n",niterFun);
346 if (niterEmiss != niterEmissMax+1) EmissionPoint();
349 printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n",
350 phiphot,fXpad,fYpad,fEmissPoint);
358 void AliRICHPatRec::EmissionPoint()
361 // Find emission point
363 Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm)
364 // 7.83 = -1/ln(T0) where
365 // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV)
366 Float_t photonLength, photonLengthMin, photonLengthMax;
368 photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad)));
369 photonLengthMin=fRw*photonLength/(1.-photonLength);
370 photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad);
371 fEmissPoint = fRw + photonLengthMin - photonLengthMax;
375 void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean)
378 // not implemented yet
380 printf("Calling PhotonSelection\n");
383 void AliRICHPatRec::BackgroundEstimation()
386 // estimate background noise
388 Float_t stepEta = 0.001;
389 Float_t etaMinBkg = 0.72;
390 Float_t etaMaxBkg = 0.75;
392 Float_t etaMax = 0.75;
394 Float_t nfreon = 1.295;
396 Float_t etaStepMin,etaStepMax,etaStepAvg;
398 Int_t numPhotBkg, numPhotonStep;
399 Float_t funBkg,areaBkg,normBkg;
400 Float_t densityBkg,storeBkg,numStore;
406 nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta);
408 for (i=0;i<fNumEtaPhotons;i++) {
410 if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) {
414 if (numPhotBkg == 0) {
415 for (i=0;i<fNumEtaPhotons;i++) {
416 fWeightPhotons[i] = 1.;
421 // printf(" numPhotBkg %i ",numPhotBkg);
423 for (i=0;i<nstep;i++) {
424 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
425 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
426 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
428 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
429 5.52)-7.803 + 22.02*tan(etaStepAvg);
432 //printf("etaStepAvg: %f, etaStepMax: %f, etaStepMin: %f", etaStepAvg,etaStepMax,etaStepMin);
434 thetaSig = TMath::ASin(nfreon/ngas*TMath::Sin(etaStepAvg));
435 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
436 /ngas*cos(etaStepAvg)/cos(thetaSig);
437 areaBkg += stepEta*funBkg;
440 densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg;
441 // printf(" densityBkg %f \n",densityBkg);
443 nstep = (int)((etaMax-etaMin)/stepEta);
446 for (i=0;i<nstep;i++) {
447 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
448 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
449 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
451 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
452 5.52)-7.803 + 22.02*tan(etaStepAvg);
455 thetaSig = asin(nfreon/ngas*sin(etaStepAvg));
456 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
457 /ngas*cos(etaStepAvg)/cos(thetaSig);
459 areaBkg = stepEta*funBkg;
460 normBkg = densityBkg*areaBkg;
462 for (ip=0;ip<fNumEtaPhotons;ip++) {
463 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
467 if (numPhotonStep == 0) {
475 if (numPhotonStep == 0) continue;
476 for (ip=0;ip<fNumEtaPhotons;ip++) {
477 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
481 fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep);
483 printf(" normBkg %f numPhotonStep %i fW %f \n",
484 normBkg, numPhotonStep, fWeightPhotons[ip]);
486 if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.;
493 void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta)
496 // not implemented yet
498 printf("Calling FlagPhotons\n");
502 //////////////////////////////////////////
508 Int_t AliRICHPatRec::PhotonInBand()
510 //0=label for parameters giving internal band ellipse
511 //1=label for parameters giving external band ellipse
513 Float_t imp[2], mass[2], energy[2], beta[2];
514 Float_t emissPointLength[2];
515 Float_t e1, e2, f1, f2;
516 Float_t nfreon[2], nquartz[2];
518 Float_t pointsOnCathode[3];
520 Float_t phpad, thetacer[2];
521 Float_t bandradius[2], padradius;
523 imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission
526 mass[0] = 0.938; //proton mass
527 mass[1] = 0.139; //pion mass
529 emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator
530 emissPointLength[1] = 0.;//at the end of radiator
532 //parameters to calculate freon window refractive index vs. energy
536 //parameters to calculate quartz window refractive index vs. energy
550 for (times=0; times<=1; times++) {
552 nfreon[times] = a+b*energy[times];
555 nquartz[times] = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(energy[times],2)))+
556 (f2/(TMath::Power(e2,2)-TMath::Power(energy[times],2))));
558 beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2));
560 thetacer[times] = CherenkovAngle( nfreon[times], beta[times]);
562 bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times],
563 emissPointLength[times],
564 thetacer[times], phpad, pointsOnCathode);
565 //printf(" ppp %f %f %f \n",pointsOnCathode);
568 bandradius[0] -= 1.6;
569 bandradius[1] += 1.6;
570 padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2));
571 // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]);
573 if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1;
577 Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz,
578 Float_t emissPointLength, Float_t thetacer,
579 Float_t phpad, Float_t pointsOnCathode[3])
582 // Find the distance to MIP impact
584 Float_t distanceValue;
586 TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect
587 //to local reference sistem with the origin in the MIP entrance
589 TVector3 vectEmissPointLength(1,1,1);
590 Float_t magEmissPointLenght;
592 TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect
593 Float_t magRadExitPhot2;
594 //to a reference sistem with origin in the photon emission point and
595 //axes parallel to the MIP reference sistem
597 TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect
598 Float_t magQuarExitPhot;
600 TVector3 gapExitPhot(1,1,1) ;
601 Float_t magGapExitPhot;
603 TVector3 PhotocatExitPhot(1,1,1);
605 Double_t thetarad , phirad ;
606 Double_t thetaquar, phiquar;
607 Double_t thetagap , phigap ;
611 magEmissPointLenght = emissPointLength/cos(fTrackTheta);
613 vectEmissPointLength.SetMag(magEmissPointLenght);
614 vectEmissPointLength.SetTheta(fTrackTheta);
615 vectEmissPointLength.SetPhi(fTrackPhi);
618 radExitPhot2.SetTheta(thetacer);
619 radExitPhot2.SetPhi(phpad);
626 r1. RotateY(fTrackTheta);
627 r2. RotateZ(fTrackPhi);
631 r = r2 * r1;//rotation about the y axis by MIP theta incidence angle
632 //following by a rotation about the z axis by MIP phi incidence angle;
635 radExitPhot2 = r * radExitPhot2;
636 theta2 = radExitPhot2.Theta();
637 magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2);
638 radExitPhot2.SetMag(magRadExitPhot2);
641 radExitPhot = vectEmissPointLength + radExitPhot2;
642 thetarad = radExitPhot.Theta();
643 phirad = radExitPhot.Phi(); //check on the original file //
645 thetaquar = SnellAngle( nfreon, nquartz, theta2);
646 phiquar = radExitPhot2.Phi();
647 if(thetaquar == 999.) return thetaquar;
648 magQuarExitPhot = fQw/cos(thetaquar);
649 quarExitPhot.SetMag( magQuarExitPhot);
650 quarExitPhot.SetTheta(thetaquar);
651 quarExitPhot.SetPhi(phiquar);
653 thetagap = SnellAngle( nquartz, ngas, thetaquar);
655 if(thetagap == 999.) return thetagap;
656 magGapExitPhot = fTgap/cos(thetagap);
657 gapExitPhot.SetMag( magGapExitPhot);
658 gapExitPhot.SetTheta(thetagap);
659 gapExitPhot.SetPhi(phigap);
661 PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot;
663 distanceValue = sqrt(TMath::Power(PhotocatExitPhot(0),2)
664 +TMath::Power(PhotocatExitPhot(1),2));
665 pointsOnCathode[0] = (Float_t) PhotocatExitPhot(0) + fXshift - fTrackLoc[0];
666 pointsOnCathode[1] = (Float_t) PhotocatExitPhot(1) + fYshift - fTrackLoc[1];
667 pointsOnCathode[2] = (Float_t) PhotocatExitPhot(2);
669 //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]);
671 return distanceValue;
675 Float_t AliRICHPatRec::PhiPad()
681 Float_t thetapad, phipad;
682 Float_t thetarot, phirot;
684 zpad = fRw + fQw + fTgap;
686 TVector3 photonPad(fXpad, fYpad, zpad);
687 thetapad = photonPad.Theta();
688 phipad = photonPad.Phi();
694 thetarot = - fTrackTheta;
695 phirot = - fTrackPhi;
697 r2. RotateY(thetarot);
699 r = r2 * r1;//rotation about the z axis by MIP -phi incidence angle
700 //following by a rotation about the y axis by MIP -theta incidence angle;
702 photonPad = r * photonPad;
704 phipad = photonPad.Phi();
709 Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1)
712 // Compute the Snell angle
714 Float_t sinrefractangle;
715 Float_t refractangle;
717 sinrefractangle = (n1/n2)*sin(theta1);
719 if(sinrefractangle>1.) {
724 refractangle = asin(sinrefractangle);
728 Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta)
731 // Compute the cerenkov angle
740 thetacer = acos (1./(n*beta));
744 Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta)
751 beta = 1./(n*cos(theta));
758 void AliRICHPatRec::HoughResponse()
762 // Implement Hough response pat. rec. method
767 int i, j, k, nCorrBand;
770 float angle, thetaCerMean;
775 float stepEta = 0.001;
776 float windowEta = 0.040;
780 float etaPeakPos = -1;
781 Int_t etaPeakCount = -1;
786 nBin = (int)(0.5+etaMax/(stepEta));
787 nCorrBand = (int)(0.5+ windowEta/(2 * stepEta));
788 memset ((void *)hcs, 0, etaBin*sizeof(int));
790 for (k=0; k< fNumEtaPhotons; k++) {
792 angle = fEtaPhotons[k];
794 if (angle>=etaMin && angle<= etaMax) {
795 bin = (int)(0.5+angle/(stepEta));
799 if (bin2>nBin) bin2=nBin;
801 for (j=bin1; j<bin2; j++) {
802 hcs[j] += fWeightPhotons[k];
805 thetaCerMean += angle;
809 thetaCerMean /= fNumEtaPhotons;
813 for (bin=0; bin <nBin; bin++) {
814 angle = (bin+0.5) * (stepEta);
815 if (hcs[bin] && hcs[bin] > etaPeakPos) {
817 etaPeakPos = hcs[bin];
821 if (hcs[bin] == etaPeakPos) {
822 etaPeak[++etaPeakCount] = angle;
827 for (i=0; i<etaPeakCount+1; i++) {
828 fThetaCerenkov += etaPeak[i];
830 if (etaPeakCount>=0) {
831 fThetaCerenkov /= etaPeakCount+1;
832 fThetaPeakPos = etaPeakPos;
837 void AliRICHPatRec::HoughFiltering(float hcs[])
843 float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05};
850 float stepEta = 0.001;
852 nBin = (int)(1+etaMax/stepEta);
853 sizeHCS = etaBin*sizeof(float);
855 memset ((void *)hcsFilt, 0, sizeHCS);
857 for (nx = 0; nx < nBin; nx++) {
858 for (i = 0; i < 5; i++) {
860 if (nxDx> -1 && nxDx<nBin)
861 hcsFilt[nx] += hcs[nxDx] * k[i];
865 for (nx = 0; nx < nBin; nx++) {
866 hcs[nx] = hcsFilt[nx];
870 /*void AliRICHPatRec::CerenkovRingDrawing()
873 //to draw Cherenkov ring by known Cherenkov angle
878 Float_t nfreonave, nquartzave;
881 Float_t e1, e2, f1, f2;
884 //parameters to calculate freon window refractive index vs. energy
889 //parameters to calculate quartz window refractive index vs. energy
901 for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) {
903 phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad;
905 aveEnerg = (energy[0]+energy[1])/2.;
907 nfreonave = a+b*aveEnerg;
908 nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+
909 (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2))));
911 bandradius = DistanceFromMip(nfreonave, nquartzave,
912 fEmissPoint,fThetaCerenkov, phpad);
914 fCoordEllipse[0][Nphpad] = fOnCathode[0];
915 fCoordEllipse[1][Nphpad] = fOnCathode[1];
916 printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]);