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 1.5 2000/10/02 15:50:25 jbarbosa
19 Fixed forward declarations.
21 Revision 1.4 2000/06/30 16:33:43 dibari
22 Several changes (ring drawing, fiducial selection, etc.)
24 Revision 1.3 2000/06/15 15:47:12 jbarbosa
25 Corrected compilation errors on HP-UX (replaced pow with TMath::Power)
27 Revision 1.2 2000/06/12 15:26:09 jbarbosa
30 Revision 1.1 2000/06/09 14:53:01 jbarbosa
31 Bari's pattern recognition algorithm
35 #include "AliRICHHit.h"
36 #include "AliRICHCerenkov.h"
37 #include "AliRICHPadHit.h"
38 #include "AliRICHDigit.h"
39 #include "AliRICHRawCluster.h"
40 #include "AliRICHRecHit.h"
42 #include "AliDetector.h"
44 #include "AliRICHPoints.h"
45 #include "AliRICHSegmentation.h"
46 #include "AliRICHPatRec.h"
48 #include "AliRICHConst.h"
49 #include "AliRICHPoints.h"
51 #include "AliRICHHitMap.h"
53 #include <TParticle.h>
61 ClassImp(AliRICHPatRec)
62 //___________________________________________
63 AliRICHPatRec::AliRICHPatRec() : TObject()
65 // Default constructor
69 //___________________________________________
70 AliRICHPatRec::AliRICHPatRec(const char *name, const char *title)
73 //Constructor for Bari's pattern recogniton method object
76 void AliRICHPatRec::PatRec()
79 // Pattern recognition algorithm
81 AliRICHChamber* iChamber;
82 AliRICHSegmentation* segmentation;
84 Int_t ntracks, ndigits[kNCH];
95 printf("PatRec started\n");
97 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
98 TTree *treeH = gAlice->TreeH();
100 ntracks =(Int_t) treeH->GetEntries();
102 for (itr=0; itr<ntracks; itr++) {
104 status = TrackParam(itr,ich);
105 if(status==1) continue;
106 //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi);
107 // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.);
109 iChamber = &(pRICH->Chamber(ich));
110 segmentation=iChamber->GetSegmentationModel();
112 nent=(Int_t)gAlice->TreeD()->GetEntries();
113 gAlice->TreeD()->GetEvent(nent-1);
114 TClonesArray *pDigitss = pRICH->DigitsAddress(ich);
115 ndigits[ich] = pDigitss->GetEntriesFast();
116 printf("Digits in chamber %d: %d\n",ich,ndigits[ich]);
117 AliRICHDigit *padI = 0;
121 for (Int_t dig=0;dig<ndigits[ich];dig++) {
122 padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig);
126 segmentation->GetPadCxy(x,y,rx,ry);
128 //printf("Pad coordinates x:%d, Real coordinates x:%f\n",x,rx);
129 //printf("Pad coordinates y:%d, Real coordinates y:%f\n",y,ry);
135 fCerenkovAnglePad = PhotonCerenkovAngle();
136 if(fCerenkovAnglePad==-999) continue;
138 if(!PhotonInBand()) continue;
143 segmentation->GetPadIxy(fXpad,fYpad,xpad,ypad);
145 padsUsedX[goodPhotons]=xpad;
146 padsUsedY[goodPhotons]=ypad;
149 fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad;
151 fNumEtaPhotons = goodPhotons;
153 BackgroundEstimation();
156 //CerenkovRingDrawing();
160 rechit[2] = fThetaCerenkov;
161 rechit[3] = fXshift + fTrackLoc[0];
162 rechit[4] = fYshift + fTrackLoc[1];
163 rechit[5] = fEmissPoint;
164 rechit[6] = goodPhotons;
166 //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]);
168 pRICH->AddRecHit(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY);
172 gAlice->TreeR()->Fill();
174 for (i=0;i<kNCH;i++) {
175 fRec=pRICH->RecHitsAddress(i);
176 int ndig=fRec->GetEntriesFast();
177 printf ("Chamber %d, rings %d\n",i,ndig);
179 pRICH->ResetRecHits();
184 Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich)
186 // Get Local coordinates of track impact
188 AliRICHChamber* iChamber;
189 AliRICHSegmentation* segmentation;
191 Float_t trackglob[3];
199 printf("Calling TrackParam\n");
202 TTree *treeH = gAlice->TreeH();
203 treeH->GetEvent(itr);
205 AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH");
206 AliRICHHit* mHit=(AliRICHHit*)pRICH->FirstHit(-1);
207 if(mHit==0) return 1;
208 ich = mHit->fChamber-1;
209 trackglob[0] = mHit->X();
210 trackglob[1] = mHit->Y();
211 trackglob[2] = mHit->Z();
215 fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2));
216 thetatr = (mHit->fTheta)*(Float_t)kDegrad;
217 phitr = mHit->fPhi*(Float_t)kDegrad;
219 part = mHit->fParticle;
221 iChamber = &(pRICH->Chamber(ich));
222 iChamber->GlobaltoLocal(trackglob,trackloc);
224 segmentation=iChamber->GetSegmentationModel();
226 // retrieve geometrical params
228 AliRICHGeometry* fGeometry=iChamber->GetGeometryModel();
230 fRw = fGeometry->GetFreonThickness();
231 fQw = fGeometry->GetQuartzThickness();
232 fTgap = fGeometry->GetGapThickness();
233 Float_t radiatorToPads= fGeometry->GetRadiatorToPads();
234 //+ fGeometry->GetProximityGapThickness();
236 //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap);
238 //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr);
239 Float_t apar = radiatorToPads*tan(thetatr);
240 fTrackLoc[0] = apar*cos(phitr);
241 fTrackLoc[1] = apar*sin(phitr);
242 //fTrackLoc[2] = fRw + fQw + fTgap;
243 fTrackLoc[2] = radiatorToPads;
244 fTrackTheta = thetatr;
247 fXshift = trackloc[0] - fTrackLoc[0];
248 fYshift = trackloc[2] - fTrackLoc[1];
253 Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius,
257 // Estimation of emission point
259 Float_t nquartz = 1.585;
261 Float_t nfreon = 1.295;
264 // printf("Calling EstimationLimits\n");
266 Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta);
267 Float_t b1 = (fRw-fEmissPoint)*tan(lim);
268 Float_t b2 = fQw / sqrt(TMath::Power(nquartz,2)-TMath::Power(nfreon*sin(lim),2));
269 Float_t b3 = fTgap / sqrt(TMath::Power(ngas,2)-TMath::Power(nfreon*sin(lim),2));
270 Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3);
271 value = TMath::Power(radius,2)
272 -TMath::Power((apar*cos(fTrackPhi)-bpar*cos(phiphot)),2)
273 -TMath::Power((apar*sin(fTrackPhi)-bpar*sin(phiphot)),2);
278 Float_t AliRICHPatRec::PhotonCerenkovAngle()
280 // Cherenkov pad angle reconstruction
284 Float_t cherMax = 0.8;
286 Float_t eps = 0.0001;
287 Int_t niterEmiss = 0;
288 Int_t niterEmissMax = 0;
289 Float_t x1,x2,x3=0,p1,p2,p3;
293 // printf("Calling PhotonCerenkovAngle\n");
295 radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2));
296 fEmissPoint = fRw/2.; //Start value of EmissionPoint
298 while(niterEmiss<=niterEmissMax) {
301 argY = fYpad - fEmissPoint*tan(fTrackTheta)*sin(fTrackPhi);
302 argX = fXpad - fEmissPoint*tan(fTrackTheta)*cos(fTrackPhi);
303 phiphot = atan2(argY,argX);
304 p1 = EstimationAtLimits(cherMin,radius,phiphot);
305 p2 = EstimationAtLimits(cherMax,radius,phiphot);
308 // printf("PhotonCerenkovAngle failed\n");
312 //start to find the Cherenkov pad angle
316 p3 = EstimationAtLimits(x3,radius,phiphot);
317 while(TMath::Abs(p3)>eps){
321 p1 = EstimationAtLimits(x1,radius,phiphot);
324 p3 = EstimationAtLimits(x3,radius,phiphot);
328 // printf(" max iterations in PhotonCerenkovAngle\n");
332 // printf("niterFun %i \n",niterFun);
334 if (niterEmiss != niterEmissMax+1) EmissionPoint();
337 printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n",
338 phiphot,fXpad,fYpad,fEmissPoint);
346 void AliRICHPatRec::EmissionPoint()
349 // Find emission point
351 Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm)
352 // 7.83 = -1/ln(T0) where
353 // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV)
354 Float_t photonLength, photonLengthMin, photonLengthMax;
356 photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad)));
357 photonLengthMin=fRw*photonLength/(1.-photonLength);
358 photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad);
359 fEmissPoint = fRw + photonLengthMin - photonLengthMax;
363 void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean)
366 // not implemented yet
368 printf("Calling PhotonSelection\n");
371 void AliRICHPatRec::BackgroundEstimation()
374 // estimate background noise
376 Float_t stepEta = 0.001;
377 Float_t etaMinBkg = 0.72;
378 Float_t etaMaxBkg = 0.75;
380 Float_t etaMax = 0.75;
382 Float_t nfreon = 1.295;
384 Float_t etaStepMin,etaStepMax,etaStepAvg;
386 Int_t numPhotBkg, numPhotonStep;
387 Float_t funBkg,areaBkg,normBkg;
388 Float_t densityBkg,storeBkg,numStore;
394 nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta);
396 for (i=0;i<fNumEtaPhotons;i++) {
398 if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) {
402 if (numPhotBkg == 0) {
403 for (i=0;i<fNumEtaPhotons;i++) {
404 fWeightPhotons[i] = 1.;
409 // printf(" numPhotBkg %i ",numPhotBkg);
411 for (i=0;i<nstep;i++) {
412 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
413 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
414 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
416 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
417 5.52)-7.803 + 22.02*tan(etaStepAvg);
419 thetaSig = asin(nfreon/ngas*sin(etaStepAvg));
420 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
421 /ngas*cos(etaStepAvg)/cos(thetaSig);
422 areaBkg += stepEta*funBkg;
425 densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg;
426 // printf(" densityBkg %f \n",densityBkg);
428 nstep = (int)((etaMax-etaMin)/stepEta);
431 for (i=0;i<nstep;i++) {
432 etaStepMin = etaMinBkg + (Float_t)(i)*stepEta;
433 etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta;
434 etaStepAvg = 0.5*(etaStepMax + etaStepMin);
436 funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)),
437 5.52)-7.803 + 22.02*tan(etaStepAvg);
440 thetaSig = asin(nfreon/ngas*sin(etaStepAvg));
441 funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon
442 /ngas*cos(etaStepAvg)/cos(thetaSig);
444 areaBkg = stepEta*funBkg;
445 normBkg = densityBkg*areaBkg;
447 for (ip=0;ip<fNumEtaPhotons;ip++) {
448 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
452 if (numPhotonStep == 0) {
460 if (numPhotonStep == 0) continue;
461 for (ip=0;ip<fNumEtaPhotons;ip++) {
462 if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) {
466 fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep);
468 printf(" normBkg %f numPhotonStep %i fW %f \n",
469 normBkg, numPhotonStep, fWeightPhotons[ip]);
471 if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.;
478 void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta)
481 // not implemented yet
483 printf("Calling FlagPhotons\n");
487 //////////////////////////////////////////
493 Int_t AliRICHPatRec::PhotonInBand()
495 //0=label for parameters giving internal band ellipse
496 //1=label for parameters giving external band ellipse
498 Float_t imp[2], mass[2], energy[2], beta[2];
499 Float_t emissPointLength[2];
500 Float_t e1, e2, f1, f2;
501 Float_t nfreon[2], nquartz[2];
503 Float_t pointsOnCathode[3];
505 Float_t phpad, thetacer[2];
506 Float_t bandradius[2], padradius;
508 imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission
511 mass[0] = 0.938; //proton mass
512 mass[1] = 0.139; //pion mass
514 emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator
515 emissPointLength[1] = 0.;//at the end of radiator
517 //parameters to calculate freon window refractive index vs. energy
521 //parameters to calculate quartz window refractive index vs. energy
535 for (times=0; times<=1; times++) {
537 nfreon[times] = a+b*energy[times];
540 nquartz[times] = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(energy[times],2)))+
541 (f2/(TMath::Power(e2,2)-TMath::Power(energy[times],2))));
543 beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2));
545 thetacer[times] = CherenkovAngle( nfreon[times], beta[times]);
547 bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times],
548 emissPointLength[times],
549 thetacer[times], phpad, pointsOnCathode);
550 //printf(" ppp %f %f %f \n",pointsOnCathode);
553 bandradius[0] -= 1.6;
554 bandradius[1] += 1.6;
555 padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2));
556 // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]);
558 if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1;
562 Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz,
563 Float_t emissPointLength, Float_t thetacer,
564 Float_t phpad, Float_t pointsOnCathode[3])
567 // Find the distance to MIP impact
569 Float_t distanceValue;
571 TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect
572 //to local reference sistem with the origin in the MIP entrance
574 TVector3 vectEmissPointLength(1,1,1);
575 Float_t magEmissPointLenght;
577 TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect
578 Float_t magRadExitPhot2;
579 //to a reference sistem with origin in the photon emission point and
580 //axes parallel to the MIP reference sistem
582 TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect
583 Float_t magQuarExitPhot;
585 TVector3 gapExitPhot(1,1,1) ;
586 Float_t magGapExitPhot;
588 TVector3 PhotocatExitPhot(1,1,1);
590 Double_t thetarad , phirad ;
591 Double_t thetaquar, phiquar;
592 Double_t thetagap , phigap ;
596 magEmissPointLenght = emissPointLength/cos(fTrackTheta);
598 vectEmissPointLength.SetMag(magEmissPointLenght);
599 vectEmissPointLength.SetTheta(fTrackTheta);
600 vectEmissPointLength.SetPhi(fTrackPhi);
603 radExitPhot2.SetTheta(thetacer);
604 radExitPhot2.SetPhi(phpad);
611 r1. RotateY(fTrackTheta);
612 r2. RotateZ(fTrackPhi);
616 r = r2 * r1;//rotation about the y axis by MIP theta incidence angle
617 //following by a rotation about the z axis by MIP phi incidence angle;
620 radExitPhot2 = r * radExitPhot2;
621 theta2 = radExitPhot2.Theta();
622 magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2);
623 radExitPhot2.SetMag(magRadExitPhot2);
626 radExitPhot = vectEmissPointLength + radExitPhot2;
627 thetarad = radExitPhot.Theta();
628 phirad = radExitPhot.Phi(); //check on the original file //
630 thetaquar = SnellAngle( nfreon, nquartz, theta2);
631 phiquar = radExitPhot2.Phi();
632 if(thetaquar == 999.) return thetaquar;
633 magQuarExitPhot = fQw/cos(thetaquar);
634 quarExitPhot.SetMag( magQuarExitPhot);
635 quarExitPhot.SetTheta(thetaquar);
636 quarExitPhot.SetPhi(phiquar);
638 thetagap = SnellAngle( nquartz, ngas, thetaquar);
640 if(thetagap == 999.) return thetagap;
641 magGapExitPhot = fTgap/cos(thetagap);
642 gapExitPhot.SetMag( magGapExitPhot);
643 gapExitPhot.SetTheta(thetagap);
644 gapExitPhot.SetPhi(phigap);
646 PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot;
648 distanceValue = sqrt(TMath::Power(PhotocatExitPhot(0),2)
649 +TMath::Power(PhotocatExitPhot(1),2));
650 pointsOnCathode[0] = (Float_t) PhotocatExitPhot(0) + fXshift - fTrackLoc[0];
651 pointsOnCathode[1] = (Float_t) PhotocatExitPhot(1) + fYshift - fTrackLoc[1];
652 pointsOnCathode[2] = (Float_t) PhotocatExitPhot(2);
654 //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]);
656 return distanceValue;
660 Float_t AliRICHPatRec::PhiPad()
666 Float_t thetapad, phipad;
667 Float_t thetarot, phirot;
669 zpad = fRw + fQw + fTgap;
671 TVector3 photonPad(fXpad, fYpad, zpad);
672 thetapad = photonPad.Theta();
673 phipad = photonPad.Phi();
679 thetarot = - fTrackTheta;
680 phirot = - fTrackPhi;
682 r2. RotateY(thetarot);
684 r = r2 * r1;//rotation about the z axis by MIP -phi incidence angle
685 //following by a rotation about the y axis by MIP -theta incidence angle;
687 photonPad = r * photonPad;
689 phipad = photonPad.Phi();
694 Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1)
697 // Compute the Snell angle
699 Float_t sinrefractangle;
700 Float_t refractangle;
702 sinrefractangle = (n1/n2)*sin(theta1);
704 if(sinrefractangle>1.) {
709 refractangle = asin(sinrefractangle);
713 Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta)
716 // Compute the cerenkov angle
725 thetacer = acos (1./(n*beta));
729 Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta)
736 beta = 1./(n*cos(theta));
743 void AliRICHPatRec::HoughResponse()
747 // Implement Hough response pat. rec. method
752 int i, j, k, nCorrBand;
755 float angle, thetaCerMean;
760 float stepEta = 0.001;
761 float windowEta = 0.040;
765 float etaPeakPos = -1;
766 Int_t etaPeakCount = -1;
771 nBin = (int)(0.5+etaMax/(stepEta));
772 nCorrBand = (int)(0.5+ windowEta/(2 * stepEta));
773 memset ((void *)hcs, 0, etaBin*sizeof(int));
775 for (k=0; k< fNumEtaPhotons; k++) {
777 angle = fEtaPhotons[k];
779 if (angle>=etaMin && angle<= etaMax) {
780 bin = (int)(0.5+angle/(stepEta));
784 if (bin2>nBin) bin2=nBin;
786 for (j=bin1; j<bin2; j++) {
787 hcs[j] += fWeightPhotons[k];
790 thetaCerMean += angle;
794 thetaCerMean /= fNumEtaPhotons;
798 for (bin=0; bin <nBin; bin++) {
799 angle = (bin+0.5) * (stepEta);
800 if (hcs[bin] && hcs[bin] > etaPeakPos) {
802 etaPeakPos = hcs[bin];
806 if (hcs[bin] == etaPeakPos) {
807 etaPeak[++etaPeakCount] = angle;
812 for (i=0; i<etaPeakCount+1; i++) {
813 fThetaCerenkov += etaPeak[i];
815 if (etaPeakCount>=0) {
816 fThetaCerenkov /= etaPeakCount+1;
817 fThetaPeakPos = etaPeakPos;
822 void AliRICHPatRec::HoughFiltering(float hcs[])
828 float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05};
835 float stepEta = 0.001;
837 nBin = (int)(1+etaMax/stepEta);
838 sizeHCS = etaBin*sizeof(float);
840 memset ((void *)hcsFilt, 0, sizeHCS);
842 for (nx = 0; nx < nBin; nx++) {
843 for (i = 0; i < 5; i++) {
845 if (nxDx> -1 && nxDx<nBin)
846 hcsFilt[nx] += hcs[nxDx] * k[i];
850 for (nx = 0; nx < nBin; nx++) {
851 hcs[nx] = hcsFilt[nx];
855 /*void AliRICHPatRec::CerenkovRingDrawing()
858 //to draw Cherenkov ring by known Cherenkov angle
863 Float_t nfreonave, nquartzave;
866 Float_t e1, e2, f1, f2;
869 //parameters to calculate freon window refractive index vs. energy
874 //parameters to calculate quartz window refractive index vs. energy
886 for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) {
888 phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad;
890 aveEnerg = (energy[0]+energy[1])/2.;
892 nfreonave = a+b*aveEnerg;
893 nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+
894 (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2))));
896 bandradius = DistanceFromMip(nfreonave, nquartzave,
897 fEmissPoint,fThetaCerenkov, phpad);
899 fCoordEllipse[0][Nphpad] = fOnCathode[0];
900 fCoordEllipse[1][Nphpad] = fOnCathode[1];
901 printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]);