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e7257cad | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* | |
17 | $Log$ | |
b251a2b5 | 18 | Revision 1.9 2001/02/13 20:38:48 jbarbosa |
19 | Changes to make it work with new IO. | |
20 | ||
a5886574 | 21 | Revision 1.8 2000/11/01 15:37:18 jbarbosa |
22 | Updated to use its own rec. point object. | |
23 | ||
4a5c8776 | 24 | Revision 1.7 2000/10/03 21:44:09 morsch |
25 | Use AliSegmentation and AliHit abstract base classes. | |
26 | ||
a2f7eaf6 | 27 | Revision 1.6 2000/10/02 21:28:12 fca |
28 | Removal of useless dependecies via forward declarations | |
29 | ||
94de3818 | 30 | Revision 1.5 2000/10/02 15:50:25 jbarbosa |
31 | Fixed forward declarations. | |
32 | ||
488e98ba | 33 | Revision 1.4 2000/06/30 16:33:43 dibari |
34 | Several changes (ring drawing, fiducial selection, etc.) | |
35 | ||
e0b63a71 | 36 | Revision 1.3 2000/06/15 15:47:12 jbarbosa |
37 | Corrected compilation errors on HP-UX (replaced pow with TMath::Power) | |
38 | ||
00df6e79 | 39 | Revision 1.2 2000/06/12 15:26:09 jbarbosa |
40 | Cleaned up version. | |
41 | ||
237c933d | 42 | Revision 1.1 2000/06/09 14:53:01 jbarbosa |
43 | Bari's pattern recognition algorithm | |
44 | ||
e7257cad | 45 | */ |
46 | ||
237c933d | 47 | #include "AliRICHHit.h" |
48 | #include "AliRICHCerenkov.h" | |
b251a2b5 | 49 | #include "AliRICHSDigit.h" |
237c933d | 50 | #include "AliRICHDigit.h" |
51 | #include "AliRICHRawCluster.h" | |
4a5c8776 | 52 | #include "AliRICHRecHit1D.h" |
e7257cad | 53 | #include "AliRun.h" |
54 | #include "AliDetector.h" | |
55 | #include "AliRICH.h" | |
56 | #include "AliRICHPoints.h" | |
a2f7eaf6 | 57 | #include "AliSegmentation.h" |
e7257cad | 58 | #include "AliRICHPatRec.h" |
59 | #include "AliRICH.h" | |
60 | #include "AliRICHConst.h" | |
61 | #include "AliRICHPoints.h" | |
62 | #include "AliConst.h" | |
a2f7eaf6 | 63 | #include "AliHitMap.h" |
237c933d | 64 | |
65 | #include <TParticle.h> | |
66 | #include <TMath.h> | |
67 | #include <TRandom.h> | |
68 | #include <TCanvas.h> | |
69 | #include <TH2.h> | |
94de3818 | 70 | #include <TTree.h> |
e7257cad | 71 | |
72 | ||
73 | ClassImp(AliRICHPatRec) | |
74 | //___________________________________________ | |
75 | AliRICHPatRec::AliRICHPatRec() : TObject() | |
76 | { | |
237c933d | 77 | // Default constructor |
78 | ||
e7257cad | 79 | //fChambers = 0; |
80 | } | |
81 | //___________________________________________ | |
82 | AliRICHPatRec::AliRICHPatRec(const char *name, const char *title) | |
83 | : TObject() | |
84 | { | |
237c933d | 85 | //Constructor for Bari's pattern recogniton method object |
e7257cad | 86 | } |
87 | ||
88 | void AliRICHPatRec::PatRec() | |
89 | { | |
90 | ||
237c933d | 91 | // Pattern recognition algorithm |
92 | ||
e7257cad | 93 | AliRICHChamber* iChamber; |
a2f7eaf6 | 94 | AliSegmentation* segmentation; |
e7257cad | 95 | |
237c933d | 96 | Int_t ntracks, ndigits[kNCH]; |
e7257cad | 97 | Int_t itr, ich, i; |
237c933d | 98 | Int_t goodPhotons; |
e7257cad | 99 | Int_t x,y,q; |
a2f7eaf6 | 100 | Float_t rx,ry,rz; |
e7257cad | 101 | Int_t nent,status; |
e0b63a71 | 102 | Int_t padsUsedX[100]; |
103 | Int_t padsUsedY[100]; | |
e7257cad | 104 | |
e0b63a71 | 105 | Float_t rechit[7]; |
e7257cad | 106 | |
107 | printf("PatRec started\n"); | |
108 | ||
237c933d | 109 | AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH"); |
110 | TTree *treeH = gAlice->TreeH(); | |
e7257cad | 111 | |
237c933d | 112 | ntracks =(Int_t) treeH->GetEntries(); |
e7257cad | 113 | // ntracks = 1; |
114 | for (itr=0; itr<ntracks; itr++) { | |
115 | ||
116 | status = TrackParam(itr,ich); | |
117 | if(status==1) continue; | |
e0b63a71 | 118 | //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi); |
e7257cad | 119 | // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.); |
120 | ||
237c933d | 121 | iChamber = &(pRICH->Chamber(ich)); |
e7257cad | 122 | segmentation=iChamber->GetSegmentationModel(); |
123 | ||
124 | nent=(Int_t)gAlice->TreeD()->GetEntries(); | |
b251a2b5 | 125 | gAlice->TreeD()->GetEvent(1); |
237c933d | 126 | TClonesArray *pDigitss = pRICH->DigitsAddress(ich); |
127 | ndigits[ich] = pDigitss->GetEntriesFast(); | |
e0b63a71 | 128 | printf("Digits in chamber %d: %d\n",ich,ndigits[ich]); |
e7257cad | 129 | AliRICHDigit *padI = 0; |
130 | ||
237c933d | 131 | goodPhotons = 0; |
e7257cad | 132 | |
133 | for (Int_t dig=0;dig<ndigits[ich];dig++) { | |
237c933d | 134 | padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig); |
e7257cad | 135 | x=padI->fPadX; |
136 | y=padI->fPadY; | |
137 | q=padI->fSignal; | |
a2f7eaf6 | 138 | segmentation->GetPadC(x,y,rx,ry,rz); |
e7257cad | 139 | |
e0b63a71 | 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); | |
142 | ||
e7257cad | 143 | fXpad = rx-fXshift; |
144 | fYpad = ry-fYshift; | |
145 | fQpad = q; | |
146 | ||
e7257cad | 147 | fCerenkovAnglePad = PhotonCerenkovAngle(); |
148 | if(fCerenkovAnglePad==-999) continue; | |
149 | ||
150 | if(!PhotonInBand()) continue; | |
151 | ||
e0b63a71 | 152 | Int_t xpad; |
153 | Int_t ypad; | |
154 | ||
a2f7eaf6 | 155 | segmentation->GetPadI(fXpad,fYpad,0,xpad,ypad); |
e7257cad | 156 | |
e0b63a71 | 157 | padsUsedX[goodPhotons]=xpad; |
158 | padsUsedY[goodPhotons]=ypad; | |
159 | ||
237c933d | 160 | goodPhotons++; |
e0b63a71 | 161 | fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad; |
e7257cad | 162 | } |
237c933d | 163 | fNumEtaPhotons = goodPhotons; |
e7257cad | 164 | |
165 | BackgroundEstimation(); | |
166 | ||
e7257cad | 167 | HoughResponse(); |
e0b63a71 | 168 | //CerenkovRingDrawing(); |
e7257cad | 169 | |
170 | rechit[0] = 0; | |
171 | rechit[1] = 0; | |
172 | rechit[2] = fThetaCerenkov; | |
e0b63a71 | 173 | rechit[3] = fXshift + fTrackLoc[0]; |
174 | rechit[4] = fYshift + fTrackLoc[1]; | |
175 | rechit[5] = fEmissPoint; | |
176 | rechit[6] = goodPhotons; | |
e7257cad | 177 | |
e0b63a71 | 178 | //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]); |
e7257cad | 179 | |
4a5c8776 | 180 | pRICH->AddRecHit1D(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY); |
e7257cad | 181 | |
e7257cad | 182 | } |
183 | ||
184 | gAlice->TreeR()->Fill(); | |
185 | TClonesArray *fRec; | |
237c933d | 186 | for (i=0;i<kNCH;i++) { |
4a5c8776 | 187 | fRec=pRICH->RecHitsAddress1D(i); |
e7257cad | 188 | int ndig=fRec->GetEntriesFast(); |
189 | printf ("Chamber %d, rings %d\n",i,ndig); | |
190 | } | |
4a5c8776 | 191 | pRICH->ResetRecHits1D(); |
e7257cad | 192 | |
e7257cad | 193 | } |
194 | ||
195 | ||
196 | Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich) | |
197 | { | |
198 | // Get Local coordinates of track impact | |
199 | ||
200 | AliRICHChamber* iChamber; | |
a2f7eaf6 | 201 | AliSegmentation* segmentation; |
e7257cad | 202 | |
203 | Float_t trackglob[3]; | |
204 | Float_t trackloc[3]; | |
205 | Float_t thetatr; | |
206 | Float_t phitr; | |
207 | Float_t iloss; | |
208 | Float_t part; | |
209 | Float_t pX, pY, pZ; | |
210 | ||
4a5c8776 | 211 | //printf("Calling TrackParam\n"); |
e7257cad | 212 | |
213 | gAlice->ResetHits(); | |
237c933d | 214 | TTree *treeH = gAlice->TreeH(); |
215 | treeH->GetEvent(itr); | |
e7257cad | 216 | |
237c933d | 217 | AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH"); |
218 | AliRICHHit* mHit=(AliRICHHit*)pRICH->FirstHit(-1); | |
e7257cad | 219 | if(mHit==0) return 1; |
220 | ich = mHit->fChamber-1; | |
94de3818 | 221 | trackglob[0] = mHit->X(); |
222 | trackglob[1] = mHit->Y(); | |
223 | trackglob[2] = mHit->Z(); | |
e7257cad | 224 | pX = mHit->fMomX; |
225 | pY = mHit->fMomY; | |
226 | pZ = mHit->fMomZ; | |
00df6e79 | 227 | fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2)); |
e0b63a71 | 228 | thetatr = (mHit->fTheta)*(Float_t)kDegrad; |
e7257cad | 229 | phitr = mHit->fPhi*(Float_t)kDegrad; |
230 | iloss = mHit->fLoss; | |
231 | part = mHit->fParticle; | |
232 | ||
237c933d | 233 | iChamber = &(pRICH->Chamber(ich)); |
e7257cad | 234 | iChamber->GlobaltoLocal(trackglob,trackloc); |
235 | ||
236 | segmentation=iChamber->GetSegmentationModel(); | |
237 | ||
238 | // retrieve geometrical params | |
239 | ||
240 | AliRICHGeometry* fGeometry=iChamber->GetGeometryModel(); | |
241 | ||
242 | fRw = fGeometry->GetFreonThickness(); | |
243 | fQw = fGeometry->GetQuartzThickness(); | |
e0b63a71 | 244 | fTgap = fGeometry->GetGapThickness(); |
245 | Float_t radiatorToPads= fGeometry->GetRadiatorToPads(); | |
246 | //+ fGeometry->GetProximityGapThickness(); | |
e7257cad | 247 | |
e0b63a71 | 248 | //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap); |
249 | ||
250 | //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr); | |
251 | Float_t apar = radiatorToPads*tan(thetatr); | |
e7257cad | 252 | fTrackLoc[0] = apar*cos(phitr); |
253 | fTrackLoc[1] = apar*sin(phitr); | |
e0b63a71 | 254 | //fTrackLoc[2] = fRw + fQw + fTgap; |
255 | fTrackLoc[2] = radiatorToPads; | |
e7257cad | 256 | fTrackTheta = thetatr; |
257 | fTrackPhi = phitr; | |
258 | ||
259 | fXshift = trackloc[0] - fTrackLoc[0]; | |
260 | fYshift = trackloc[2] - fTrackLoc[1]; | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius, | |
266 | Float_t phiphot) | |
267 | { | |
237c933d | 268 | |
269 | // Estimation of emission point | |
270 | ||
e7257cad | 271 | Float_t nquartz = 1.585; |
272 | Float_t ngas = 1.; | |
273 | Float_t nfreon = 1.295; | |
274 | Float_t value; | |
275 | ||
276 | // printf("Calling EstimationLimits\n"); | |
277 | ||
278 | Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta); | |
279 | Float_t b1 = (fRw-fEmissPoint)*tan(lim); | |
00df6e79 | 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)); | |
e7257cad | 282 | Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3); |
00df6e79 | 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); | |
e7257cad | 286 | return value; |
287 | } | |
288 | ||
289 | ||
290 | Float_t AliRICHPatRec::PhotonCerenkovAngle() | |
291 | { | |
292 | // Cherenkov pad angle reconstruction | |
293 | ||
294 | Float_t radius; | |
295 | Float_t cherMin = 0; | |
296 | Float_t cherMax = 0.8; | |
297 | Float_t phiphot; | |
298 | Float_t eps = 0.0001; | |
299 | Int_t niterEmiss = 0; | |
300 | Int_t niterEmissMax = 0; | |
237c933d | 301 | Float_t x1,x2,x3=0,p1,p2,p3; |
e7257cad | 302 | Float_t argY,argX; |
303 | Int_t niterFun; | |
304 | ||
305 | // printf("Calling PhotonCerenkovAngle\n"); | |
306 | ||
00df6e79 | 307 | radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2)); |
e7257cad | 308 | fEmissPoint = fRw/2.; //Start value of EmissionPoint |
309 | ||
310 | while(niterEmiss<=niterEmissMax) { | |
311 | ||
312 | niterFun = 0; | |
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); | |
318 | if(p1*p2>0) | |
319 | { | |
320 | // printf("PhotonCerenkovAngle failed\n"); | |
321 | return -999; | |
322 | } | |
323 | ||
324 | //start to find the Cherenkov pad angle | |
325 | x1 = cherMin; | |
326 | x2 = cherMax; | |
327 | x3 = (x1+x2)/2.; | |
328 | p3 = EstimationAtLimits(x3,radius,phiphot); | |
329 | while(TMath::Abs(p3)>eps){ | |
330 | if(p1*p3<0) x2 = x3; | |
331 | if(p1*p3>0) { | |
332 | x1 = x3; | |
333 | p1 = EstimationAtLimits(x1,radius,phiphot); | |
334 | } | |
335 | x3 = (x1+x2)/2.; | |
336 | p3 = EstimationAtLimits(x3,radius,phiphot); | |
337 | niterFun++; | |
338 | ||
339 | if(niterFun>=1000) { | |
340 | // printf(" max iterations in PhotonCerenkovAngle\n"); | |
341 | return x3; | |
342 | } | |
343 | } | |
344 | // printf("niterFun %i \n",niterFun); | |
345 | niterEmiss++; | |
346 | if (niterEmiss != niterEmissMax+1) EmissionPoint(); | |
347 | } | |
348 | /* | |
349 | printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n", | |
350 | phiphot,fXpad,fYpad,fEmissPoint); | |
351 | */ | |
352 | ||
353 | return x3; | |
354 | ||
355 | } | |
356 | ||
357 | ||
358 | void AliRICHPatRec::EmissionPoint() | |
359 | { | |
237c933d | 360 | |
361 | // Find emission point | |
362 | ||
363 | Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm) | |
e7257cad | 364 | // 7.83 = -1/ln(T0) where |
365 | // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV) | |
237c933d | 366 | Float_t photonLength, photonLengthMin, photonLengthMax; |
e7257cad | 367 | |
237c933d | 368 | photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad))); |
369 | photonLengthMin=fRw*photonLength/(1.-photonLength); | |
370 | photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad); | |
371 | fEmissPoint = fRw + photonLengthMin - photonLengthMax; | |
e7257cad | 372 | |
373 | } | |
374 | ||
375 | void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean) | |
376 | { | |
237c933d | 377 | |
378 | // not implemented yet | |
379 | ||
e7257cad | 380 | printf("Calling PhotonSelection\n"); |
381 | } | |
382 | ||
383 | void AliRICHPatRec::BackgroundEstimation() | |
384 | { | |
237c933d | 385 | |
386 | // estimate background noise | |
387 | ||
388 | Float_t stepEta = 0.001; | |
389 | Float_t etaMinBkg = 0.72; | |
390 | Float_t etaMaxBkg = 0.75; | |
391 | Float_t etaMin = 0.; | |
392 | Float_t etaMax = 0.75; | |
e7257cad | 393 | Float_t ngas = 1.; |
394 | Float_t nfreon = 1.295; | |
395 | ||
237c933d | 396 | Float_t etaStepMin,etaStepMax,etaStepAvg; |
e7257cad | 397 | Int_t i,ip,nstep; |
237c933d | 398 | Int_t numPhotBkg, numPhotonStep; |
399 | Float_t funBkg,areaBkg,normBkg; | |
400 | Float_t densityBkg,storeBkg,numStore; | |
401 | Float_t thetaSig; | |
e7257cad | 402 | |
237c933d | 403 | numPhotBkg = 0; |
404 | areaBkg = 0.; | |
e7257cad | 405 | |
237c933d | 406 | nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta); |
e7257cad | 407 | |
408 | for (i=0;i<fNumEtaPhotons;i++) { | |
409 | ||
237c933d | 410 | if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) { |
411 | numPhotBkg++; | |
e7257cad | 412 | } |
413 | } | |
237c933d | 414 | if (numPhotBkg == 0) { |
e7257cad | 415 | for (i=0;i<fNumEtaPhotons;i++) { |
416 | fWeightPhotons[i] = 1.; | |
417 | } | |
418 | return; | |
419 | } | |
420 | ||
237c933d | 421 | // printf(" numPhotBkg %i ",numPhotBkg); |
e7257cad | 422 | |
423 | for (i=0;i<nstep;i++) { | |
237c933d | 424 | etaStepMin = etaMinBkg + (Float_t)(i)*stepEta; |
425 | etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta; | |
426 | etaStepAvg = 0.5*(etaStepMax + etaStepMin); | |
e7257cad | 427 | /* |
00df6e79 | 428 | funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)), |
237c933d | 429 | 5.52)-7.803 + 22.02*tan(etaStepAvg); |
e7257cad | 430 | */ |
4a5c8776 | 431 | |
432 | //printf("etaStepAvg: %f, etaStepMax: %f, etaStepMin: %f", etaStepAvg,etaStepMax,etaStepMin); | |
433 | ||
434 | thetaSig = TMath::ASin(nfreon/ngas*TMath::Sin(etaStepAvg)); | |
00df6e79 | 435 | funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon |
237c933d | 436 | /ngas*cos(etaStepAvg)/cos(thetaSig); |
437 | areaBkg += stepEta*funBkg; | |
e7257cad | 438 | } |
439 | ||
237c933d | 440 | densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg; |
441 | // printf(" densityBkg %f \n",densityBkg); | |
e7257cad | 442 | |
237c933d | 443 | nstep = (int)((etaMax-etaMin)/stepEta); |
444 | storeBkg = 0.; | |
445 | numStore = 0; | |
e7257cad | 446 | for (i=0;i<nstep;i++) { |
237c933d | 447 | etaStepMin = etaMinBkg + (Float_t)(i)*stepEta; |
448 | etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta; | |
449 | etaStepAvg = 0.5*(etaStepMax + etaStepMin); | |
e7257cad | 450 | /* |
00df6e79 | 451 | funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)), |
237c933d | 452 | 5.52)-7.803 + 22.02*tan(etaStepAvg); |
e7257cad | 453 | */ |
454 | ||
237c933d | 455 | thetaSig = asin(nfreon/ngas*sin(etaStepAvg)); |
00df6e79 | 456 | funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon |
237c933d | 457 | /ngas*cos(etaStepAvg)/cos(thetaSig); |
e7257cad | 458 | |
237c933d | 459 | areaBkg = stepEta*funBkg; |
460 | normBkg = densityBkg*areaBkg; | |
461 | numPhotonStep = 0; | |
e7257cad | 462 | for (ip=0;ip<fNumEtaPhotons;ip++) { |
237c933d | 463 | if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) { |
464 | numPhotonStep++; | |
e7257cad | 465 | } |
466 | } | |
237c933d | 467 | if (numPhotonStep == 0) { |
468 | storeBkg += normBkg; | |
469 | numStore++; | |
470 | if (numStore>50) { | |
471 | numStore = 0; | |
472 | storeBkg = 0.; | |
e7257cad | 473 | } |
474 | } | |
237c933d | 475 | if (numPhotonStep == 0) continue; |
e7257cad | 476 | for (ip=0;ip<fNumEtaPhotons;ip++) { |
237c933d | 477 | if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) { |
478 | normBkg +=storeBkg; | |
479 | storeBkg = 0; | |
480 | numStore = 0; | |
481 | fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep); | |
e7257cad | 482 | /* |
237c933d | 483 | printf(" normBkg %f numPhotonStep %i fW %f \n", |
484 | normBkg, numPhotonStep, fWeightPhotons[ip]); | |
e7257cad | 485 | */ |
486 | if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.; | |
487 | } | |
488 | } | |
489 | } | |
490 | } | |
491 | ||
492 | ||
493 | void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta) | |
494 | { | |
237c933d | 495 | |
496 | // not implemented yet | |
497 | ||
e7257cad | 498 | printf("Calling FlagPhotons\n"); |
499 | } | |
500 | ||
501 | ||
502 | ////////////////////////////////////////// | |
503 | ||
504 | ||
505 | ||
506 | ||
507 | ||
508 | Int_t AliRICHPatRec::PhotonInBand() | |
509 | { | |
510 | //0=label for parameters giving internal band ellipse | |
511 | //1=label for parameters giving external band ellipse | |
512 | ||
237c933d | 513 | Float_t imp[2], mass[2], energy[2], beta[2]; |
514 | Float_t emissPointLength[2]; | |
515 | Float_t e1, e2, f1, f2; | |
e7257cad | 516 | Float_t nfreon[2], nquartz[2]; |
517 | Int_t times; | |
e0b63a71 | 518 | Float_t pointsOnCathode[3]; |
e7257cad | 519 | |
520 | Float_t phpad, thetacer[2]; | |
521 | Float_t bandradius[2], padradius; | |
522 | ||
523 | imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission | |
524 | imp[1] = 1.2; | |
525 | ||
526 | mass[0] = 0.938; //proton mass | |
527 | mass[1] = 0.139; //pion mass | |
528 | ||
237c933d | 529 | emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator |
530 | emissPointLength[1] = 0.;//at the end of radiator | |
e7257cad | 531 | |
532 | //parameters to calculate freon window refractive index vs. energy | |
533 | Float_t a = 1.177; | |
534 | Float_t b = 0.0172; | |
535 | ||
536 | //parameters to calculate quartz window refractive index vs. energy | |
537 | /* | |
538 | Energ[0] = 5.6; | |
539 | Energ[1] = 7.7; | |
540 | */ | |
237c933d | 541 | energy[0] = 5.0; |
542 | energy[1] = 8.0; | |
543 | e1 = 10.666; | |
544 | e2 = 18.125; | |
545 | f1 = 46.411; | |
546 | f2 = 228.71; | |
e7257cad | 547 | |
e7257cad | 548 | phpad = PhiPad(); |
549 | ||
550 | for (times=0; times<=1; times++) { | |
551 | ||
237c933d | 552 | nfreon[times] = a+b*energy[times]; |
e0b63a71 | 553 | //nfreon[times] = 1; |
e7257cad | 554 | |
00df6e79 | 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)))); | |
e7257cad | 557 | |
00df6e79 | 558 | beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2)); |
e7257cad | 559 | |
560 | thetacer[times] = CherenkovAngle( nfreon[times], beta[times]); | |
561 | ||
562 | bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times], | |
e0b63a71 | 563 | emissPointLength[times], |
564 | thetacer[times], phpad, pointsOnCathode); | |
565 | //printf(" ppp %f %f %f \n",pointsOnCathode); | |
566 | } | |
e7257cad | 567 | |
568 | bandradius[0] -= 1.6; | |
569 | bandradius[1] += 1.6; | |
00df6e79 | 570 | padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2)); |
e7257cad | 571 | // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]); |
572 | ||
573 | if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1; | |
574 | return 0; | |
575 | } | |
576 | ||
577 | Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz, | |
237c933d | 578 | Float_t emissPointLength, Float_t thetacer, |
e0b63a71 | 579 | Float_t phpad, Float_t pointsOnCathode[3]) |
e7257cad | 580 | { |
e7257cad | 581 | |
237c933d | 582 | // Find the distance to MIP impact |
583 | ||
584 | Float_t distanceValue; | |
585 | ||
586 | TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect | |
e7257cad | 587 | //to local reference sistem with the origin in the MIP entrance |
588 | ||
237c933d | 589 | TVector3 vectEmissPointLength(1,1,1); |
590 | Float_t magEmissPointLenght; | |
e7257cad | 591 | |
237c933d | 592 | TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect |
593 | Float_t magRadExitPhot2; | |
e7257cad | 594 | //to a reference sistem with origin in the photon emission point and |
595 | //axes parallel to the MIP reference sistem | |
596 | ||
237c933d | 597 | TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect |
598 | Float_t magQuarExitPhot; | |
e7257cad | 599 | // |
237c933d | 600 | TVector3 gapExitPhot(1,1,1) ; |
601 | Float_t magGapExitPhot; | |
e7257cad | 602 | // |
e0b63a71 | 603 | TVector3 PhotocatExitPhot(1,1,1); |
e7257cad | 604 | Double_t theta2; |
605 | Double_t thetarad , phirad ; | |
606 | Double_t thetaquar, phiquar; | |
607 | Double_t thetagap , phigap ; | |
608 | ||
609 | Float_t ngas = 1.; | |
610 | ||
237c933d | 611 | magEmissPointLenght = emissPointLength/cos(fTrackTheta); |
e7257cad | 612 | |
237c933d | 613 | vectEmissPointLength.SetMag(magEmissPointLenght); |
614 | vectEmissPointLength.SetTheta(fTrackTheta); | |
615 | vectEmissPointLength.SetPhi(fTrackPhi); | |
e7257cad | 616 | |
617 | ||
237c933d | 618 | radExitPhot2.SetTheta(thetacer); |
619 | radExitPhot2.SetPhi(phpad); | |
e7257cad | 620 | |
621 | ||
622 | TRotation r1; | |
623 | TRotation r2; | |
624 | TRotation r; | |
625 | ||
626 | r1. RotateY(fTrackTheta); | |
627 | r2. RotateZ(fTrackPhi); | |
628 | ||
629 | ||
630 | ||
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; | |
633 | ||
634 | ||
237c933d | 635 | radExitPhot2 = r * radExitPhot2; |
636 | theta2 = radExitPhot2.Theta(); | |
637 | magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2); | |
638 | radExitPhot2.SetMag(magRadExitPhot2); | |
e7257cad | 639 | |
640 | ||
237c933d | 641 | radExitPhot = vectEmissPointLength + radExitPhot2; |
642 | thetarad = radExitPhot.Theta(); | |
237c933d | 643 | phirad = radExitPhot.Phi(); //check on the original file // |
e7257cad | 644 | |
645 | thetaquar = SnellAngle( nfreon, nquartz, theta2); | |
237c933d | 646 | phiquar = radExitPhot2.Phi(); |
e7257cad | 647 | if(thetaquar == 999.) return thetaquar; |
237c933d | 648 | magQuarExitPhot = fQw/cos(thetaquar); |
649 | quarExitPhot.SetMag( magQuarExitPhot); | |
650 | quarExitPhot.SetTheta(thetaquar); | |
651 | quarExitPhot.SetPhi(phiquar); | |
e7257cad | 652 | |
653 | thetagap = SnellAngle( nquartz, ngas, thetaquar); | |
654 | phigap = phiquar; | |
655 | if(thetagap == 999.) return thetagap; | |
237c933d | 656 | magGapExitPhot = fTgap/cos(thetagap); |
657 | gapExitPhot.SetMag( magGapExitPhot); | |
658 | gapExitPhot.SetTheta(thetagap); | |
659 | gapExitPhot.SetPhi(phigap); | |
e7257cad | 660 | |
e0b63a71 | 661 | PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot; |
e7257cad | 662 | |
e0b63a71 | 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); | |
668 | ||
669 | //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]); | |
670 | ||
671 | return distanceValue; | |
672 | ||
673 | } | |
e7257cad | 674 | |
675 | Float_t AliRICHPatRec::PhiPad() | |
676 | { | |
237c933d | 677 | |
678 | // ?? | |
679 | ||
e7257cad | 680 | Float_t zpad; |
681 | Float_t thetapad, phipad; | |
682 | Float_t thetarot, phirot; | |
683 | ||
684 | zpad = fRw + fQw + fTgap; | |
685 | ||
237c933d | 686 | TVector3 photonPad(fXpad, fYpad, zpad); |
687 | thetapad = photonPad.Theta(); | |
688 | phipad = photonPad.Phi(); | |
e7257cad | 689 | |
690 | TRotation r1; | |
691 | TRotation r2; | |
692 | TRotation r; | |
693 | ||
694 | thetarot = - fTrackTheta; | |
695 | phirot = - fTrackPhi; | |
696 | r1. RotateZ(phirot); | |
697 | r2. RotateY(thetarot); | |
698 | ||
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; | |
701 | ||
237c933d | 702 | photonPad = r * photonPad; |
e7257cad | 703 | |
237c933d | 704 | phipad = photonPad.Phi(); |
e7257cad | 705 | |
706 | return phipad; | |
707 | } | |
708 | ||
709 | Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1) | |
710 | { | |
237c933d | 711 | |
712 | // Compute the Snell angle | |
713 | ||
e7257cad | 714 | Float_t sinrefractangle; |
715 | Float_t refractangle; | |
716 | ||
717 | sinrefractangle = (n1/n2)*sin(theta1); | |
718 | ||
719 | if(sinrefractangle>1.) { | |
720 | refractangle = 999.; | |
721 | return refractangle; | |
722 | } | |
723 | ||
724 | refractangle = asin(sinrefractangle); | |
725 | return refractangle; | |
726 | } | |
727 | ||
728 | Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta) | |
729 | { | |
237c933d | 730 | |
731 | // Compute the cerenkov angle | |
732 | ||
e7257cad | 733 | Float_t thetacer; |
734 | ||
735 | if((n*beta)<1.) { | |
736 | thetacer = 999.; | |
737 | return thetacer; | |
738 | } | |
739 | ||
740 | thetacer = acos (1./(n*beta)); | |
741 | return thetacer; | |
742 | } | |
743 | ||
744 | Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta) | |
745 | { | |
237c933d | 746 | |
747 | // Find beta | |
748 | ||
e7257cad | 749 | Float_t beta; |
750 | ||
751 | beta = 1./(n*cos(theta)); | |
752 | return beta; | |
753 | } | |
754 | ||
755 | ||
756 | ||
757 | ||
758 | void AliRICHPatRec::HoughResponse() | |
759 | ||
760 | { | |
237c933d | 761 | |
762 | // Implement Hough response pat. rec. method | |
763 | ||
e7257cad | 764 | int bin=0; |
765 | int bin1=0; | |
766 | int bin2=0; | |
237c933d | 767 | int i, j, k, nCorrBand; |
768 | int etaBin = 750; | |
769 | float hcs[750]; | |
770 | float angle, thetaCerMean; | |
e7257cad | 771 | |
237c933d | 772 | float etaPeak[30]; |
773 | float etaMin = 0.00; | |
774 | float etaMax = 0.75; | |
775 | float stepEta = 0.001; | |
776 | float windowEta = 0.040; | |
e7257cad | 777 | |
237c933d | 778 | int nBin; |
e7257cad | 779 | |
237c933d | 780 | float etaPeakPos = -1; |
781 | Int_t etaPeakCount = -1; | |
e7257cad | 782 | |
237c933d | 783 | thetaCerMean = 0.; |
e7257cad | 784 | fThetaCerenkov = 0.; |
785 | ||
237c933d | 786 | nBin = (int)(0.5+etaMax/(stepEta)); |
787 | nCorrBand = (int)(0.5+ windowEta/(2 * stepEta)); | |
788 | memset ((void *)hcs, 0, etaBin*sizeof(int)); | |
e7257cad | 789 | |
790 | for (k=0; k< fNumEtaPhotons; k++) { | |
791 | ||
792 | angle = fEtaPhotons[k]; | |
793 | ||
237c933d | 794 | if (angle>=etaMin && angle<= etaMax) { |
795 | bin = (int)(0.5+angle/(stepEta)); | |
796 | bin1= bin-nCorrBand; | |
797 | bin2= bin+nCorrBand; | |
e7257cad | 798 | if (bin1<0) bin1=0; |
237c933d | 799 | if (bin2>nBin) bin2=nBin; |
e7257cad | 800 | |
801 | for (j=bin1; j<bin2; j++) { | |
237c933d | 802 | hcs[j] += fWeightPhotons[k]; |
e7257cad | 803 | } |
804 | ||
237c933d | 805 | thetaCerMean += angle; |
e7257cad | 806 | } |
807 | } | |
808 | ||
237c933d | 809 | thetaCerMean /= fNumEtaPhotons; |
e7257cad | 810 | |
237c933d | 811 | HoughFiltering(hcs); |
812 | ||
813 | for (bin=0; bin <nBin; bin++) { | |
814 | angle = (bin+0.5) * (stepEta); | |
815 | if (hcs[bin] && hcs[bin] > etaPeakPos) { | |
816 | etaPeakCount = 0; | |
817 | etaPeakPos = hcs[bin]; | |
818 | etaPeak[0]=angle; | |
e7257cad | 819 | } |
820 | else { | |
237c933d | 821 | if (hcs[bin] == etaPeakPos) { |
822 | etaPeak[++etaPeakCount] = angle; | |
e7257cad | 823 | } |
824 | } | |
825 | } | |
826 | ||
237c933d | 827 | for (i=0; i<etaPeakCount+1; i++) { |
828 | fThetaCerenkov += etaPeak[i]; | |
e7257cad | 829 | } |
237c933d | 830 | if (etaPeakCount>=0) { |
831 | fThetaCerenkov /= etaPeakCount+1; | |
832 | fThetaPeakPos = etaPeakPos; | |
e7257cad | 833 | } |
834 | } | |
835 | ||
836 | ||
237c933d | 837 | void AliRICHPatRec::HoughFiltering(float hcs[]) |
e7257cad | 838 | { |
237c933d | 839 | |
840 | // hough filtering | |
841 | ||
842 | float hcsFilt[750]; | |
843 | float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05}; | |
844 | int nx, i, nxDx; | |
e7257cad | 845 | int sizeHCS; |
237c933d | 846 | int nBin; |
e7257cad | 847 | |
237c933d | 848 | int etaBin = 750; |
849 | float etaMax = 0.75; | |
850 | float stepEta = 0.001; | |
e7257cad | 851 | |
237c933d | 852 | nBin = (int)(1+etaMax/stepEta); |
853 | sizeHCS = etaBin*sizeof(float); | |
e7257cad | 854 | |
237c933d | 855 | memset ((void *)hcsFilt, 0, sizeHCS); |
e7257cad | 856 | |
237c933d | 857 | for (nx = 0; nx < nBin; nx++) { |
e7257cad | 858 | for (i = 0; i < 5; i++) { |
237c933d | 859 | nxDx = nx + (i-2); |
860 | if (nxDx> -1 && nxDx<nBin) | |
861 | hcsFilt[nx] += hcs[nxDx] * k[i]; | |
e7257cad | 862 | } |
863 | } | |
864 | ||
237c933d | 865 | for (nx = 0; nx < nBin; nx++) { |
866 | hcs[nx] = hcsFilt[nx]; | |
e7257cad | 867 | } |
868 | } | |
869 | ||
e0b63a71 | 870 | /*void AliRICHPatRec::CerenkovRingDrawing() |
e7257cad | 871 | { |
872 | ||
873 | //to draw Cherenkov ring by known Cherenkov angle | |
874 | ||
e0b63a71 | 875 | Int_t nmaxdegrees; |
876 | Int_t Nphpad; | |
877 | Float_t phpad; | |
237c933d | 878 | Float_t nfreonave, nquartzave; |
879 | Float_t aveEnerg; | |
880 | Float_t energy[2]; | |
881 | Float_t e1, e2, f1, f2; | |
882 | Float_t bandradius; | |
e0b63a71 | 883 | |
e7257cad | 884 | //parameters to calculate freon window refractive index vs. energy |
e0b63a71 | 885 | |
237c933d | 886 | Float_t a = 1.177; |
887 | Float_t b = 0.0172; | |
888 | ||
e7257cad | 889 | //parameters to calculate quartz window refractive index vs. energy |
e0b63a71 | 890 | |
237c933d | 891 | energy[0] = 5.0; |
892 | energy[1] = 8.0; | |
893 | e1 = 10.666; | |
894 | e2 = 18.125; | |
895 | f1 = 46.411; | |
896 | f2 = 228.71; | |
897 | ||
e7257cad | 898 | |
e0b63a71 | 899 | nmaxdegrees = 36; |
237c933d | 900 | |
e0b63a71 | 901 | for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) { |
902 | ||
903 | phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad; | |
e7257cad | 904 | |
237c933d | 905 | aveEnerg = (energy[0]+energy[1])/2.; |
906 | ||
907 | nfreonave = a+b*aveEnerg; | |
00df6e79 | 908 | nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+ |
909 | (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2)))); | |
237c933d | 910 | |
237c933d | 911 | bandradius = DistanceFromMip(nfreonave, nquartzave, |
e0b63a71 | 912 | fEmissPoint,fThetaCerenkov, phpad); |
e7257cad | 913 | |
e0b63a71 | 914 | fCoordEllipse[0][Nphpad] = fOnCathode[0]; |
915 | fCoordEllipse[1][Nphpad] = fOnCathode[1]; | |
916 | printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]); | |
237c933d | 917 | |
237c933d | 918 | } |
919 | ||
e0b63a71 | 920 | }*/ |
e7257cad | 921 | |
e7257cad | 922 |