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 1.10 2001/02/27 15:21:06 jbarbosa
19 Transition to SDigits.
21 Revision 1.9 2001/02/13 20:38:48 jbarbosa
22 Changes to make it work with new IO.
24 Revision 1.8 2000/11/01 15:37:18 jbarbosa
25 Updated to use its own rec. point object.
27 Revision 1.7 2000/10/03 21:44:09 morsch
28 Use AliSegmentation and AliHit abstract base classes.
30 Revision 1.6 2000/10/02 21:28:12 fca
31 Removal of useless dependecies via forward declarations
33 Revision 1.5 2000/10/02 15:50:25 jbarbosa
34 Fixed forward declarations.
36 Revision 1.4 2000/06/30 16:33:43 dibari
37 Several changes (ring drawing, fiducial selection, etc.)
39 Revision 1.3 2000/06/15 15:47:12 jbarbosa
40 Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
42 Revision 1.2 2000/06/12 15:26:09 jbarbosa
45 Revision 1.1 2000/06/09 14:53:01 jbarbosa
46 Bari's pattern recognition algorithm
50 #include "AliRICHHit.h"
51 #include "AliRICHCerenkov.h"
52 #include "AliRICHSDigit.h"
53 #include "AliRICHDigit.h"
54 #include "AliRICHRawCluster.h"
55 #include "AliRICHRecHit1D.h"
57 #include "AliDetector.h"
59 #include "AliRICHPoints.h"
60 #include "AliSegmentation.h"
61 #include "AliRICHPatRec.h"
63 #include "AliRICHConst.h"
64 #include "AliRICHPoints.h"
66 #include "AliHitMap.h"
68 #include <TParticle.h>
76 ClassImp(AliRICHPatRec)
77 //___________________________________________
78 AliRICHPatRec::AliRICHPatRec() : TObject()
80 // Default constructor
84 //___________________________________________
85 AliRICHPatRec::AliRICHPatRec(const char *name, const char *title)
88 //Constructor for Bari's pattern recogniton method object
91 void AliRICHPatRec::PatRec()
94 // Pattern recognition algorithm
96 AliRICHChamber* iChamber;
97 AliSegmentation* segmentation;
99 Int_t ntracks, ndigits[kNCH];
105 Int_t padsUsedX[100];
106 Int_t padsUsedY[100];
110 //printf("PatRec started\n");
112 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
113 TTree *treeH = gAlice->TreeH();
115 ntracks =(Int_t) treeH->GetEntries();
117 for (itr=0; itr<ntracks; itr++) {
119 status = TrackParam(itr,ich);
120 if(status==1) continue;
121 //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi);
122 // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.);
124 iChamber = &(pRICH->Chamber(ich));
125 segmentation=iChamber->GetSegmentationModel();
127 nent=(Int_t)gAlice->TreeD()->GetEntries();
128 gAlice->TreeD()->GetEvent(0);
129 TClonesArray *pDigitss = pRICH->DigitsAddress(ich);
130 ndigits[ich] = pDigitss->GetEntriesFast();
131 printf("Digits in chamber %d: %d\n",ich,ndigits[ich]);
132 AliRICHDigit *padI = 0;
136 for (Int_t dig=0;dig<ndigits[ich];dig++) {
137 padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig);
141 segmentation->GetPadC(x,y,rx,ry,rz);
143 //printf("Pad coordinates x:%d, Real coordinates x:%f\n",x,rx);
144 //printf("Pad coordinates y:%d, Real coordinates y:%f\n",y,ry);
150 fCerenkovAnglePad = PhotonCerenkovAngle();
151 if(fCerenkovAnglePad==-999) continue;
153 if(!PhotonInBand()) continue;
158 segmentation->GetPadI(fXpad,fYpad,0,xpad,ypad);
160 padsUsedX[goodPhotons]=xpad;
161 padsUsedY[goodPhotons]=ypad;
164 fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad;
166 fNumEtaPhotons = goodPhotons;
168 BackgroundEstimation();
171 //CerenkovRingDrawing();
175 rechit[2] = fThetaCerenkov;
176 rechit[3] = fXshift + fTrackLoc[0];
177 rechit[4] = fYshift + fTrackLoc[1];
178 rechit[5] = fEmissPoint;
179 rechit[6] = goodPhotons;
181 //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]);
183 pRICH->AddRecHit1D(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY);
187 gAlice->TreeR()->Fill();
189 for (i=0;i<kNCH;i++) {
190 fRec=pRICH->RecHitsAddress1D(i);
191 int ndig=fRec->GetEntriesFast();
192 printf ("Chamber %d, rings %d\n",i,ndig);
194 pRICH->ResetRecHits1D();
199 Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich)
201 // Get Local coordinates of track impact
203 AliRICHChamber* iChamber;
204 AliSegmentation* segmentation;
206 Float_t trackglob[3];
214 //printf("Calling TrackParam\n");
217 TTree *treeH = gAlice->TreeH();
218 treeH->GetEvent(itr);
220 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
221 AliRICHHit* mHit=(AliRICHHit*)pRICH->FirstHit(-1);
222 if(mHit==0) return 1;
223 ich = mHit->fChamber-1;
224 trackglob[0] = mHit->X();
225 trackglob[1] = mHit->Y();
226 trackglob[2] = mHit->Z();
230 fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2));
231 thetatr = (mHit->fTheta)*(Float_t)kDegrad;
232 phitr = mHit->fPhi*(Float_t)kDegrad;
234 part = mHit->fParticle;
236 iChamber = &(pRICH->Chamber(ich));
237 iChamber->GlobaltoLocal(trackglob,trackloc);
239 segmentation=iChamber->GetSegmentationModel();
241 // retrieve geometrical params
243 AliRICHGeometry* fGeometry=iChamber->GetGeometryModel();
245 fRw = fGeometry->GetFreonThickness();
246 fQw = fGeometry->GetQuartzThickness();
247 fTgap = fGeometry->GetGapThickness();
248 Float_t radiatorToPads= fGeometry->GetRadiatorToPads();
249 //+ fGeometry->GetProximityGapThickness();
251 //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap);
253 //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr);
254 Float_t apar = radiatorToPads*tan(thetatr);
255 fTrackLoc[0] = apar*cos(phitr);
256 fTrackLoc[1] = apar*sin(phitr);
257 //fTrackLoc[2] = fRw + fQw + fTgap;
258 fTrackLoc[2] = radiatorToPads;
259 fTrackTheta = thetatr;
262 fXshift = trackloc[0] - fTrackLoc[0];
263 fYshift = trackloc[2] - fTrackLoc[1];
268 Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius,
272 // Estimation of emission point
274 Float_t nquartz = 1.585;
276 Float_t nfreon = 1.295;
279 // printf("Calling EstimationLimits\n");
281 Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta);
282 Float_t b1 = (fRw-fEmissPoint)*tan(lim);
283 Float_t b2 = fQw / sqrt(TMath::Power(nquartz,2)-TMath::Power(nfreon*sin(lim),2));
284 Float_t b3 = fTgap / sqrt(TMath::Power(ngas,2)-TMath::Power(nfreon*sin(lim),2));
285 Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3);
286 value = TMath::Power(radius,2)
287 -TMath::Power((apar*cos(fTrackPhi)-bpar*cos(phiphot)),2)
288 -TMath::Power((apar*sin(fTrackPhi)-bpar*sin(phiphot)),2);
293 Float_t AliRICHPatRec::PhotonCerenkovAngle()
295 // Cherenkov pad angle reconstruction
299 Float_t cherMax = 0.8;
301 Float_t eps = 0.0001;
302 Int_t niterEmiss = 0;
303 Int_t niterEmissMax = 0;
304 Float_t x1,x2,x3=0,p1,p2,p3;
308 // printf("Calling PhotonCerenkovAngle\n");
310 radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2));
311 fEmissPoint = fRw/2.; //Start value of EmissionPoint
313 while(niterEmiss<=niterEmissMax) {
316 argY = fYpad - fEmissPoint*tan(fTrackTheta)*sin(fTrackPhi);
317 argX = fXpad - fEmissPoint*tan(fTrackTheta)*cos(fTrackPhi);
318 phiphot = atan2(argY,argX);
319 p1 = EstimationAtLimits(cherMin,radius,phiphot);
320 p2 = EstimationAtLimits(cherMax,radius,phiphot);
323 // printf("PhotonCerenkovAngle failed\n");
327 //start to find the Cherenkov pad angle
331 p3 = EstimationAtLimits(x3,radius,phiphot);
332 while(TMath::Abs(p3)>eps){
336 p1 = EstimationAtLimits(x1,radius,phiphot);
339 p3 = EstimationAtLimits(x3,radius,phiphot);
343 // printf(" max iterations in PhotonCerenkovAngle\n");
347 // printf("niterFun %i \n",niterFun);
349 if (niterEmiss != niterEmissMax+1) EmissionPoint();
352 printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n",
353 phiphot,fXpad,fYpad,fEmissPoint);
361 void AliRICHPatRec::EmissionPoint()
364 // Find emission point
366 Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm)
367 // 7.83 = -1/ln(T0) where
368 // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV)
369 Float_t photonLength, photonLengthMin, photonLengthMax;
371 photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad)));
372 photonLengthMin=fRw*photonLength/(1.-photonLength);
373 photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad);
374 fEmissPoint = fRw + photonLengthMin - photonLengthMax;
378 void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean)
381 // not implemented yet
383 printf("Calling PhotonSelection\n");
386 void AliRICHPatRec::BackgroundEstimation()
389 // estimate background noise
391 Float_t stepEta = 0.001;
392 Float_t etaMinBkg = 0.72;
393 Float_t etaMaxBkg = 0.75;
395 Float_t etaMax = 0.75;
397 Float_t nfreon = 1.295;
399 Float_t etaStepMin,etaStepMax,etaStepAvg;
401 Int_t numPhotBkg, numPhotonStep;
402 Float_t funBkg,areaBkg,normBkg;
403 Float_t densityBkg,storeBkg,numStore;
409 nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta);
411 for (i=0;i<fNumEtaPhotons;i++) {
413 if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) {
417 if (numPhotBkg == 0) {
418 for (i=0;i<fNumEtaPhotons;i++) {
419 fWeightPhotons[i] = 1.;
424 // printf(" numPhotBkg %i ",numPhotBkg);
426 for (i=0;i<nstep;i++) {
427 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
428 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
429 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
431 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
432 5.52)-7.803 + 22.02*tan(etaStepAvg);
435 //printf("etaStepAvg: %f, etaStepMax: %f, etaStepMin: %f", etaStepAvg,etaStepMax,etaStepMin);
437 thetaSig = TMath::ASin(nfreon/ngas*TMath::Sin(etaStepAvg));
438 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
439 /ngas*cos(etaStepAvg)/cos(thetaSig);
440 areaBkg += stepEta*funBkg;
443 densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg;
444 // printf(" densityBkg %f \n",densityBkg);
446 nstep = (int)((etaMax-etaMin)/stepEta);
449 for (i=0;i<nstep;i++) {
450 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
451 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
452 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
454 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
455 5.52)-7.803 + 22.02*tan(etaStepAvg);
458 thetaSig = asin(nfreon/ngas*sin(etaStepAvg));
459 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
460 /ngas*cos(etaStepAvg)/cos(thetaSig);
462 areaBkg = stepEta*funBkg;
463 normBkg = densityBkg*areaBkg;
465 for (ip=0;ip<fNumEtaPhotons;ip++) {
466 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
470 if (numPhotonStep == 0) {
478 if (numPhotonStep == 0) continue;
479 for (ip=0;ip<fNumEtaPhotons;ip++) {
480 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
484 fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep);
486 printf(" normBkg %f numPhotonStep %i fW %f \n",
487 normBkg, numPhotonStep, fWeightPhotons[ip]);
489 if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.;
496 void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta)
499 // not implemented yet
501 printf("Calling FlagPhotons\n");
505 //////////////////////////////////////////
511 Int_t AliRICHPatRec::PhotonInBand()
513 //0=label for parameters giving internal band ellipse
514 //1=label for parameters giving external band ellipse
516 Float_t imp[2], mass[2], energy[2], beta[2];
517 Float_t emissPointLength[2];
518 Float_t e1, e2, f1, f2;
519 Float_t nfreon[2], nquartz[2];
521 Float_t pointsOnCathode[3];
523 Float_t phpad, thetacer[2];
524 Float_t bandradius[2], padradius;
526 imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission
529 mass[0] = 0.938; //proton mass
530 mass[1] = 0.139; //pion mass
532 emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator
533 emissPointLength[1] = 0.;//at the end of radiator
535 //parameters to calculate freon window refractive index vs. energy
539 //parameters to calculate quartz window refractive index vs. energy
553 for (times=0; times<=1; times++) {
555 nfreon[times] = a+b*energy[times];
558 nquartz[times] = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(energy[times],2)))+
559 (f2/(TMath::Power(e2,2)-TMath::Power(energy[times],2))));
561 beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2));
563 thetacer[times] = CherenkovAngle( nfreon[times], beta[times]);
565 bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times],
566 emissPointLength[times],
567 thetacer[times], phpad, pointsOnCathode);
568 //printf(" ppp %f %f %f \n",pointsOnCathode);
571 bandradius[0] -= 1.6;
572 bandradius[1] += 1.6;
573 padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2));
574 // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]);
576 if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1;
580 Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz,
581 Float_t emissPointLength, Float_t thetacer,
582 Float_t phpad, Float_t pointsOnCathode[3])
585 // Find the distance to MIP impact
587 Float_t distanceValue;
589 TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect
590 //to local reference sistem with the origin in the MIP entrance
592 TVector3 vectEmissPointLength(1,1,1);
593 Float_t magEmissPointLenght;
595 TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect
596 Float_t magRadExitPhot2;
597 //to a reference sistem with origin in the photon emission point and
598 //axes parallel to the MIP reference sistem
600 TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect
601 Float_t magQuarExitPhot;
603 TVector3 gapExitPhot(1,1,1) ;
604 Float_t magGapExitPhot;
606 TVector3 PhotocatExitPhot(1,1,1);
608 Double_t thetarad , phirad ;
609 Double_t thetaquar, phiquar;
610 Double_t thetagap , phigap ;
614 magEmissPointLenght = emissPointLength/cos(fTrackTheta);
616 vectEmissPointLength.SetMag(magEmissPointLenght);
617 vectEmissPointLength.SetTheta(fTrackTheta);
618 vectEmissPointLength.SetPhi(fTrackPhi);
621 radExitPhot2.SetTheta(thetacer);
622 radExitPhot2.SetPhi(phpad);
629 r1. RotateY(fTrackTheta);
630 r2. RotateZ(fTrackPhi);
634 r = r2 * r1;//rotation about the y axis by MIP theta incidence angle
635 //following by a rotation about the z axis by MIP phi incidence angle;
638 radExitPhot2 = r * radExitPhot2;
639 theta2 = radExitPhot2.Theta();
640 magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2);
641 radExitPhot2.SetMag(magRadExitPhot2);
644 radExitPhot = vectEmissPointLength + radExitPhot2;
645 thetarad = radExitPhot.Theta();
646 phirad = radExitPhot.Phi(); //check on the original file //
648 thetaquar = SnellAngle( nfreon, nquartz, theta2);
649 phiquar = radExitPhot2.Phi();
650 if(thetaquar == 999.) return thetaquar;
651 magQuarExitPhot = fQw/cos(thetaquar);
652 quarExitPhot.SetMag( magQuarExitPhot);
653 quarExitPhot.SetTheta(thetaquar);
654 quarExitPhot.SetPhi(phiquar);
656 thetagap = SnellAngle( nquartz, ngas, thetaquar);
658 if(thetagap == 999.) return thetagap;
659 magGapExitPhot = fTgap/cos(thetagap);
660 gapExitPhot.SetMag( magGapExitPhot);
661 gapExitPhot.SetTheta(thetagap);
662 gapExitPhot.SetPhi(phigap);
664 PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot;
666 distanceValue = sqrt(TMath::Power(PhotocatExitPhot(0),2)
667 +TMath::Power(PhotocatExitPhot(1),2));
668 pointsOnCathode[0] = (Float_t) PhotocatExitPhot(0) + fXshift - fTrackLoc[0];
669 pointsOnCathode[1] = (Float_t) PhotocatExitPhot(1) + fYshift - fTrackLoc[1];
670 pointsOnCathode[2] = (Float_t) PhotocatExitPhot(2);
672 //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]);
674 return distanceValue;
678 Float_t AliRICHPatRec::PhiPad()
684 Float_t thetapad, phipad;
685 Float_t thetarot, phirot;
687 zpad = fRw + fQw + fTgap;
689 TVector3 photonPad(fXpad, fYpad, zpad);
690 thetapad = photonPad.Theta();
691 phipad = photonPad.Phi();
697 thetarot = - fTrackTheta;
698 phirot = - fTrackPhi;
700 r2. RotateY(thetarot);
702 r = r2 * r1;//rotation about the z axis by MIP -phi incidence angle
703 //following by a rotation about the y axis by MIP -theta incidence angle;
705 photonPad = r * photonPad;
707 phipad = photonPad.Phi();
712 Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1)
715 // Compute the Snell angle
717 Float_t sinrefractangle;
718 Float_t refractangle;
720 sinrefractangle = (n1/n2)*sin(theta1);
722 if(sinrefractangle>1.) {
727 refractangle = asin(sinrefractangle);
731 Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta)
734 // Compute the cerenkov angle
743 thetacer = acos (1./(n*beta));
747 Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta)
754 beta = 1./(n*cos(theta));
761 void AliRICHPatRec::HoughResponse()
765 // Implement Hough response pat. rec. method
770 int i, j, k, nCorrBand;
773 float angle, thetaCerMean;
778 float stepEta = 0.001;
779 float windowEta = 0.040;
783 float etaPeakPos = -1;
784 Int_t etaPeakCount = -1;
789 nBin = (int)(0.5+etaMax/(stepEta));
790 nCorrBand = (int)(0.5+ windowEta/(2 * stepEta));
791 memset ((void *)hcs, 0, etaBin*sizeof(int));
793 for (k=0; k< fNumEtaPhotons; k++) {
795 angle = fEtaPhotons[k];
797 if (angle>=etaMin && angle<= etaMax) {
798 bin = (int)(0.5+angle/(stepEta));
802 if (bin2>nBin) bin2=nBin;
804 for (j=bin1; j<bin2; j++) {
805 hcs[j] += fWeightPhotons[k];
808 thetaCerMean += angle;
812 thetaCerMean /= fNumEtaPhotons;
816 for (bin=0; bin <nBin; bin++) {
817 angle = (bin+0.5) * (stepEta);
818 if (hcs[bin] && hcs[bin] > etaPeakPos) {
820 etaPeakPos = hcs[bin];
824 if (hcs[bin] == etaPeakPos) {
825 etaPeak[++etaPeakCount] = angle;
830 for (i=0; i<etaPeakCount+1; i++) {
831 fThetaCerenkov += etaPeak[i];
833 if (etaPeakCount>=0) {
834 fThetaCerenkov /= etaPeakCount+1;
835 fThetaPeakPos = etaPeakPos;
840 void AliRICHPatRec::HoughFiltering(float hcs[])
846 float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05};
853 float stepEta = 0.001;
855 nBin = (int)(1+etaMax/stepEta);
856 sizeHCS = etaBin*sizeof(float);
858 memset ((void *)hcsFilt, 0, sizeHCS);
860 for (nx = 0; nx < nBin; nx++) {
861 for (i = 0; i < 5; i++) {
863 if (nxDx> -1 && nxDx<nBin)
864 hcsFilt[nx] += hcs[nxDx] * k[i];
868 for (nx = 0; nx < nBin; nx++) {
869 hcs[nx] = hcsFilt[nx];
873 /*void AliRICHPatRec::CerenkovRingDrawing()
876 //to draw Cherenkov ring by known Cherenkov angle
881 Float_t nfreonave, nquartzave;
884 Float_t e1, e2, f1, f2;
887 //parameters to calculate freon window refractive index vs. energy
892 //parameters to calculate quartz window refractive index vs. energy
904 for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) {
906 phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad;
908 aveEnerg = (energy[0]+energy[1])/2.;
910 nfreonave = a+b*aveEnerg;
911 nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+
912 (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2))));
914 bandradius = DistanceFromMip(nfreonave, nquartzave,
915 fEmissPoint,fThetaCerenkov, phpad);
917 fCoordEllipse[0][Nphpad] = fOnCathode[0];
918 fCoordEllipse[1][Nphpad] = fOnCathode[1];
919 printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]);