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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 | $Log$ | |
4a5c8776 | 18 | Revision 1.7 2000/10/03 21:44:09 morsch |
19 | Use AliSegmentation and AliHit abstract base classes. | |
20 | ||
a2f7eaf6 | 21 | Revision 1.6 2000/10/02 21:28:12 fca |
22 | Removal of useless dependecies via forward declarations | |
23 | ||
94de3818 | 24 | Revision 1.5 2000/10/02 15:50:25 jbarbosa |
25 | Fixed forward declarations. | |
26 | ||
488e98ba | 27 | Revision 1.4 2000/06/30 16:33:43 dibari |
28 | Several changes (ring drawing, fiducial selection, etc.) | |
29 | ||
e0b63a71 | 30 | Revision 1.3 2000/06/15 15:47:12 jbarbosa |
31 | Corrected compilation errors on HP-UX (replaced pow with TMath::Power) | |
32 | ||
00df6e79 | 33 | Revision 1.2 2000/06/12 15:26:09 jbarbosa |
34 | Cleaned up version. | |
35 | ||
237c933d | 36 | Revision 1.1 2000/06/09 14:53:01 jbarbosa |
37 | Bari's pattern recognition algorithm | |
38 | ||
e7257cad | 39 | */ |
40 | ||
237c933d | 41 | #include "AliRICHHit.h" |
42 | #include "AliRICHCerenkov.h" | |
43 | #include "AliRICHPadHit.h" | |
44 | #include "AliRICHDigit.h" | |
45 | #include "AliRICHRawCluster.h" | |
4a5c8776 | 46 | #include "AliRICHRecHit1D.h" |
e7257cad | 47 | #include "AliRun.h" |
48 | #include "AliDetector.h" | |
49 | #include "AliRICH.h" | |
50 | #include "AliRICHPoints.h" | |
a2f7eaf6 | 51 | #include "AliSegmentation.h" |
e7257cad | 52 | #include "AliRICHPatRec.h" |
53 | #include "AliRICH.h" | |
54 | #include "AliRICHConst.h" | |
55 | #include "AliRICHPoints.h" | |
56 | #include "AliConst.h" | |
a2f7eaf6 | 57 | #include "AliHitMap.h" |
237c933d | 58 | |
59 | #include <TParticle.h> | |
60 | #include <TMath.h> | |
61 | #include <TRandom.h> | |
62 | #include <TCanvas.h> | |
63 | #include <TH2.h> | |
94de3818 | 64 | #include <TTree.h> |
e7257cad | 65 | |
66 | ||
67 | ClassImp(AliRICHPatRec) | |
68 | //___________________________________________ | |
69 | AliRICHPatRec::AliRICHPatRec() : TObject() | |
70 | { | |
237c933d | 71 | // Default constructor |
72 | ||
e7257cad | 73 | //fChambers = 0; |
74 | } | |
75 | //___________________________________________ | |
76 | AliRICHPatRec::AliRICHPatRec(const char *name, const char *title) | |
77 | : TObject() | |
78 | { | |
237c933d | 79 | //Constructor for Bari's pattern recogniton method object |
e7257cad | 80 | } |
81 | ||
82 | void AliRICHPatRec::PatRec() | |
83 | { | |
84 | ||
237c933d | 85 | // Pattern recognition algorithm |
86 | ||
e7257cad | 87 | AliRICHChamber* iChamber; |
a2f7eaf6 | 88 | AliSegmentation* segmentation; |
e7257cad | 89 | |
237c933d | 90 | Int_t ntracks, ndigits[kNCH]; |
e7257cad | 91 | Int_t itr, ich, i; |
237c933d | 92 | Int_t goodPhotons; |
e7257cad | 93 | Int_t x,y,q; |
a2f7eaf6 | 94 | Float_t rx,ry,rz; |
e7257cad | 95 | Int_t nent,status; |
e0b63a71 | 96 | Int_t padsUsedX[100]; |
97 | Int_t padsUsedY[100]; | |
e7257cad | 98 | |
e0b63a71 | 99 | Float_t rechit[7]; |
e7257cad | 100 | |
101 | printf("PatRec started\n"); | |
102 | ||
237c933d | 103 | AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH"); |
104 | TTree *treeH = gAlice->TreeH(); | |
e7257cad | 105 | |
237c933d | 106 | ntracks =(Int_t) treeH->GetEntries(); |
e7257cad | 107 | // ntracks = 1; |
108 | for (itr=0; itr<ntracks; itr++) { | |
109 | ||
110 | status = TrackParam(itr,ich); | |
111 | if(status==1) continue; | |
e0b63a71 | 112 | //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi); |
e7257cad | 113 | // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.); |
114 | ||
237c933d | 115 | iChamber = &(pRICH->Chamber(ich)); |
e7257cad | 116 | segmentation=iChamber->GetSegmentationModel(); |
117 | ||
118 | nent=(Int_t)gAlice->TreeD()->GetEntries(); | |
119 | gAlice->TreeD()->GetEvent(nent-1); | |
237c933d | 120 | TClonesArray *pDigitss = pRICH->DigitsAddress(ich); |
121 | ndigits[ich] = pDigitss->GetEntriesFast(); | |
e0b63a71 | 122 | printf("Digits in chamber %d: %d\n",ich,ndigits[ich]); |
e7257cad | 123 | AliRICHDigit *padI = 0; |
124 | ||
237c933d | 125 | goodPhotons = 0; |
e7257cad | 126 | |
127 | for (Int_t dig=0;dig<ndigits[ich];dig++) { | |
237c933d | 128 | padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig); |
e7257cad | 129 | x=padI->fPadX; |
130 | y=padI->fPadY; | |
131 | q=padI->fSignal; | |
a2f7eaf6 | 132 | segmentation->GetPadC(x,y,rx,ry,rz); |
e7257cad | 133 | |
e0b63a71 | 134 | //printf("Pad coordinates x:%d, Real coordinates x:%f\n",x,rx); |
135 | //printf("Pad coordinates y:%d, Real coordinates y:%f\n",y,ry); | |
136 | ||
e7257cad | 137 | fXpad = rx-fXshift; |
138 | fYpad = ry-fYshift; | |
139 | fQpad = q; | |
140 | ||
e7257cad | 141 | fCerenkovAnglePad = PhotonCerenkovAngle(); |
142 | if(fCerenkovAnglePad==-999) continue; | |
143 | ||
144 | if(!PhotonInBand()) continue; | |
145 | ||
e0b63a71 | 146 | Int_t xpad; |
147 | Int_t ypad; | |
148 | ||
a2f7eaf6 | 149 | segmentation->GetPadI(fXpad,fYpad,0,xpad,ypad); |
e7257cad | 150 | |
e0b63a71 | 151 | padsUsedX[goodPhotons]=xpad; |
152 | padsUsedY[goodPhotons]=ypad; | |
153 | ||
237c933d | 154 | goodPhotons++; |
e0b63a71 | 155 | fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad; |
e7257cad | 156 | } |
237c933d | 157 | fNumEtaPhotons = goodPhotons; |
e7257cad | 158 | |
159 | BackgroundEstimation(); | |
160 | ||
e7257cad | 161 | HoughResponse(); |
e0b63a71 | 162 | //CerenkovRingDrawing(); |
e7257cad | 163 | |
164 | rechit[0] = 0; | |
165 | rechit[1] = 0; | |
166 | rechit[2] = fThetaCerenkov; | |
e0b63a71 | 167 | rechit[3] = fXshift + fTrackLoc[0]; |
168 | rechit[4] = fYshift + fTrackLoc[1]; | |
169 | rechit[5] = fEmissPoint; | |
170 | rechit[6] = goodPhotons; | |
e7257cad | 171 | |
e0b63a71 | 172 | //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]); |
e7257cad | 173 | |
4a5c8776 | 174 | pRICH->AddRecHit1D(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY); |
e7257cad | 175 | |
e7257cad | 176 | } |
177 | ||
178 | gAlice->TreeR()->Fill(); | |
179 | TClonesArray *fRec; | |
237c933d | 180 | for (i=0;i<kNCH;i++) { |
4a5c8776 | 181 | fRec=pRICH->RecHitsAddress1D(i); |
e7257cad | 182 | int ndig=fRec->GetEntriesFast(); |
183 | printf ("Chamber %d, rings %d\n",i,ndig); | |
184 | } | |
4a5c8776 | 185 | pRICH->ResetRecHits1D(); |
e7257cad | 186 | |
e7257cad | 187 | } |
188 | ||
189 | ||
190 | Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich) | |
191 | { | |
192 | // Get Local coordinates of track impact | |
193 | ||
194 | AliRICHChamber* iChamber; | |
a2f7eaf6 | 195 | AliSegmentation* segmentation; |
e7257cad | 196 | |
197 | Float_t trackglob[3]; | |
198 | Float_t trackloc[3]; | |
199 | Float_t thetatr; | |
200 | Float_t phitr; | |
201 | Float_t iloss; | |
202 | Float_t part; | |
203 | Float_t pX, pY, pZ; | |
204 | ||
4a5c8776 | 205 | //printf("Calling TrackParam\n"); |
e7257cad | 206 | |
207 | gAlice->ResetHits(); | |
237c933d | 208 | TTree *treeH = gAlice->TreeH(); |
209 | treeH->GetEvent(itr); | |
e7257cad | 210 | |
237c933d | 211 | AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH"); |
212 | AliRICHHit* mHit=(AliRICHHit*)pRICH->FirstHit(-1); | |
e7257cad | 213 | if(mHit==0) return 1; |
214 | ich = mHit->fChamber-1; | |
94de3818 | 215 | trackglob[0] = mHit->X(); |
216 | trackglob[1] = mHit->Y(); | |
217 | trackglob[2] = mHit->Z(); | |
e7257cad | 218 | pX = mHit->fMomX; |
219 | pY = mHit->fMomY; | |
220 | pZ = mHit->fMomZ; | |
00df6e79 | 221 | fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2)); |
e0b63a71 | 222 | thetatr = (mHit->fTheta)*(Float_t)kDegrad; |
e7257cad | 223 | phitr = mHit->fPhi*(Float_t)kDegrad; |
224 | iloss = mHit->fLoss; | |
225 | part = mHit->fParticle; | |
226 | ||
237c933d | 227 | iChamber = &(pRICH->Chamber(ich)); |
e7257cad | 228 | iChamber->GlobaltoLocal(trackglob,trackloc); |
229 | ||
230 | segmentation=iChamber->GetSegmentationModel(); | |
231 | ||
232 | // retrieve geometrical params | |
233 | ||
234 | AliRICHGeometry* fGeometry=iChamber->GetGeometryModel(); | |
235 | ||
236 | fRw = fGeometry->GetFreonThickness(); | |
237 | fQw = fGeometry->GetQuartzThickness(); | |
e0b63a71 | 238 | fTgap = fGeometry->GetGapThickness(); |
239 | Float_t radiatorToPads= fGeometry->GetRadiatorToPads(); | |
240 | //+ fGeometry->GetProximityGapThickness(); | |
e7257cad | 241 | |
e0b63a71 | 242 | //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap); |
243 | ||
244 | //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr); | |
245 | Float_t apar = radiatorToPads*tan(thetatr); | |
e7257cad | 246 | fTrackLoc[0] = apar*cos(phitr); |
247 | fTrackLoc[1] = apar*sin(phitr); | |
e0b63a71 | 248 | //fTrackLoc[2] = fRw + fQw + fTgap; |
249 | fTrackLoc[2] = radiatorToPads; | |
e7257cad | 250 | fTrackTheta = thetatr; |
251 | fTrackPhi = phitr; | |
252 | ||
253 | fXshift = trackloc[0] - fTrackLoc[0]; | |
254 | fYshift = trackloc[2] - fTrackLoc[1]; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius, | |
260 | Float_t phiphot) | |
261 | { | |
237c933d | 262 | |
263 | // Estimation of emission point | |
264 | ||
e7257cad | 265 | Float_t nquartz = 1.585; |
266 | Float_t ngas = 1.; | |
267 | Float_t nfreon = 1.295; | |
268 | Float_t value; | |
269 | ||
270 | // printf("Calling EstimationLimits\n"); | |
271 | ||
272 | Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta); | |
273 | Float_t b1 = (fRw-fEmissPoint)*tan(lim); | |
00df6e79 | 274 | Float_t b2 = fQw / sqrt(TMath::Power(nquartz,2)-TMath::Power(nfreon*sin(lim),2)); |
275 | Float_t b3 = fTgap / sqrt(TMath::Power(ngas,2)-TMath::Power(nfreon*sin(lim),2)); | |
e7257cad | 276 | Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3); |
00df6e79 | 277 | value = TMath::Power(radius,2) |
278 | -TMath::Power((apar*cos(fTrackPhi)-bpar*cos(phiphot)),2) | |
279 | -TMath::Power((apar*sin(fTrackPhi)-bpar*sin(phiphot)),2); | |
e7257cad | 280 | return value; |
281 | } | |
282 | ||
283 | ||
284 | Float_t AliRICHPatRec::PhotonCerenkovAngle() | |
285 | { | |
286 | // Cherenkov pad angle reconstruction | |
287 | ||
288 | Float_t radius; | |
289 | Float_t cherMin = 0; | |
290 | Float_t cherMax = 0.8; | |
291 | Float_t phiphot; | |
292 | Float_t eps = 0.0001; | |
293 | Int_t niterEmiss = 0; | |
294 | Int_t niterEmissMax = 0; | |
237c933d | 295 | Float_t x1,x2,x3=0,p1,p2,p3; |
e7257cad | 296 | Float_t argY,argX; |
297 | Int_t niterFun; | |
298 | ||
299 | // printf("Calling PhotonCerenkovAngle\n"); | |
300 | ||
00df6e79 | 301 | radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2)); |
e7257cad | 302 | fEmissPoint = fRw/2.; //Start value of EmissionPoint |
303 | ||
304 | while(niterEmiss<=niterEmissMax) { | |
305 | ||
306 | niterFun = 0; | |
307 | argY = fYpad - fEmissPoint*tan(fTrackTheta)*sin(fTrackPhi); | |
308 | argX = fXpad - fEmissPoint*tan(fTrackTheta)*cos(fTrackPhi); | |
309 | phiphot = atan2(argY,argX); | |
310 | p1 = EstimationAtLimits(cherMin,radius,phiphot); | |
311 | p2 = EstimationAtLimits(cherMax,radius,phiphot); | |
312 | if(p1*p2>0) | |
313 | { | |
314 | // printf("PhotonCerenkovAngle failed\n"); | |
315 | return -999; | |
316 | } | |
317 | ||
318 | //start to find the Cherenkov pad angle | |
319 | x1 = cherMin; | |
320 | x2 = cherMax; | |
321 | x3 = (x1+x2)/2.; | |
322 | p3 = EstimationAtLimits(x3,radius,phiphot); | |
323 | while(TMath::Abs(p3)>eps){ | |
324 | if(p1*p3<0) x2 = x3; | |
325 | if(p1*p3>0) { | |
326 | x1 = x3; | |
327 | p1 = EstimationAtLimits(x1,radius,phiphot); | |
328 | } | |
329 | x3 = (x1+x2)/2.; | |
330 | p3 = EstimationAtLimits(x3,radius,phiphot); | |
331 | niterFun++; | |
332 | ||
333 | if(niterFun>=1000) { | |
334 | // printf(" max iterations in PhotonCerenkovAngle\n"); | |
335 | return x3; | |
336 | } | |
337 | } | |
338 | // printf("niterFun %i \n",niterFun); | |
339 | niterEmiss++; | |
340 | if (niterEmiss != niterEmissMax+1) EmissionPoint(); | |
341 | } | |
342 | /* | |
343 | printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n", | |
344 | phiphot,fXpad,fYpad,fEmissPoint); | |
345 | */ | |
346 | ||
347 | return x3; | |
348 | ||
349 | } | |
350 | ||
351 | ||
352 | void AliRICHPatRec::EmissionPoint() | |
353 | { | |
237c933d | 354 | |
355 | // Find emission point | |
356 | ||
357 | Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm) | |
e7257cad | 358 | // 7.83 = -1/ln(T0) where |
359 | // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV) | |
237c933d | 360 | Float_t photonLength, photonLengthMin, photonLengthMax; |
e7257cad | 361 | |
237c933d | 362 | photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad))); |
363 | photonLengthMin=fRw*photonLength/(1.-photonLength); | |
364 | photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad); | |
365 | fEmissPoint = fRw + photonLengthMin - photonLengthMax; | |
e7257cad | 366 | |
367 | } | |
368 | ||
369 | void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean) | |
370 | { | |
237c933d | 371 | |
372 | // not implemented yet | |
373 | ||
e7257cad | 374 | printf("Calling PhotonSelection\n"); |
375 | } | |
376 | ||
377 | void AliRICHPatRec::BackgroundEstimation() | |
378 | { | |
237c933d | 379 | |
380 | // estimate background noise | |
381 | ||
382 | Float_t stepEta = 0.001; | |
383 | Float_t etaMinBkg = 0.72; | |
384 | Float_t etaMaxBkg = 0.75; | |
385 | Float_t etaMin = 0.; | |
386 | Float_t etaMax = 0.75; | |
e7257cad | 387 | Float_t ngas = 1.; |
388 | Float_t nfreon = 1.295; | |
389 | ||
237c933d | 390 | Float_t etaStepMin,etaStepMax,etaStepAvg; |
e7257cad | 391 | Int_t i,ip,nstep; |
237c933d | 392 | Int_t numPhotBkg, numPhotonStep; |
393 | Float_t funBkg,areaBkg,normBkg; | |
394 | Float_t densityBkg,storeBkg,numStore; | |
395 | Float_t thetaSig; | |
e7257cad | 396 | |
237c933d | 397 | numPhotBkg = 0; |
398 | areaBkg = 0.; | |
e7257cad | 399 | |
237c933d | 400 | nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta); |
e7257cad | 401 | |
402 | for (i=0;i<fNumEtaPhotons;i++) { | |
403 | ||
237c933d | 404 | if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) { |
405 | numPhotBkg++; | |
e7257cad | 406 | } |
407 | } | |
237c933d | 408 | if (numPhotBkg == 0) { |
e7257cad | 409 | for (i=0;i<fNumEtaPhotons;i++) { |
410 | fWeightPhotons[i] = 1.; | |
411 | } | |
412 | return; | |
413 | } | |
414 | ||
237c933d | 415 | // printf(" numPhotBkg %i ",numPhotBkg); |
e7257cad | 416 | |
417 | for (i=0;i<nstep;i++) { | |
237c933d | 418 | etaStepMin = etaMinBkg + (Float_t)(i)*stepEta; |
419 | etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta; | |
420 | etaStepAvg = 0.5*(etaStepMax + etaStepMin); | |
e7257cad | 421 | /* |
00df6e79 | 422 | funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)), |
237c933d | 423 | 5.52)-7.803 + 22.02*tan(etaStepAvg); |
e7257cad | 424 | */ |
4a5c8776 | 425 | |
426 | //printf("etaStepAvg: %f, etaStepMax: %f, etaStepMin: %f", etaStepAvg,etaStepMax,etaStepMin); | |
427 | ||
428 | thetaSig = TMath::ASin(nfreon/ngas*TMath::Sin(etaStepAvg)); | |
00df6e79 | 429 | funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon |
237c933d | 430 | /ngas*cos(etaStepAvg)/cos(thetaSig); |
431 | areaBkg += stepEta*funBkg; | |
e7257cad | 432 | } |
433 | ||
237c933d | 434 | densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg; |
435 | // printf(" densityBkg %f \n",densityBkg); | |
e7257cad | 436 | |
237c933d | 437 | nstep = (int)((etaMax-etaMin)/stepEta); |
438 | storeBkg = 0.; | |
439 | numStore = 0; | |
e7257cad | 440 | for (i=0;i<nstep;i++) { |
237c933d | 441 | etaStepMin = etaMinBkg + (Float_t)(i)*stepEta; |
442 | etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta; | |
443 | etaStepAvg = 0.5*(etaStepMax + etaStepMin); | |
e7257cad | 444 | /* |
00df6e79 | 445 | funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)), |
237c933d | 446 | 5.52)-7.803 + 22.02*tan(etaStepAvg); |
e7257cad | 447 | */ |
448 | ||
237c933d | 449 | thetaSig = asin(nfreon/ngas*sin(etaStepAvg)); |
00df6e79 | 450 | funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon |
237c933d | 451 | /ngas*cos(etaStepAvg)/cos(thetaSig); |
e7257cad | 452 | |
237c933d | 453 | areaBkg = stepEta*funBkg; |
454 | normBkg = densityBkg*areaBkg; | |
455 | numPhotonStep = 0; | |
e7257cad | 456 | for (ip=0;ip<fNumEtaPhotons;ip++) { |
237c933d | 457 | if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) { |
458 | numPhotonStep++; | |
e7257cad | 459 | } |
460 | } | |
237c933d | 461 | if (numPhotonStep == 0) { |
462 | storeBkg += normBkg; | |
463 | numStore++; | |
464 | if (numStore>50) { | |
465 | numStore = 0; | |
466 | storeBkg = 0.; | |
e7257cad | 467 | } |
468 | } | |
237c933d | 469 | if (numPhotonStep == 0) continue; |
e7257cad | 470 | for (ip=0;ip<fNumEtaPhotons;ip++) { |
237c933d | 471 | if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) { |
472 | normBkg +=storeBkg; | |
473 | storeBkg = 0; | |
474 | numStore = 0; | |
475 | fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep); | |
e7257cad | 476 | /* |
237c933d | 477 | printf(" normBkg %f numPhotonStep %i fW %f \n", |
478 | normBkg, numPhotonStep, fWeightPhotons[ip]); | |
e7257cad | 479 | */ |
480 | if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.; | |
481 | } | |
482 | } | |
483 | } | |
484 | } | |
485 | ||
486 | ||
487 | void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta) | |
488 | { | |
237c933d | 489 | |
490 | // not implemented yet | |
491 | ||
e7257cad | 492 | printf("Calling FlagPhotons\n"); |
493 | } | |
494 | ||
495 | ||
496 | ////////////////////////////////////////// | |
497 | ||
498 | ||
499 | ||
500 | ||
501 | ||
502 | Int_t AliRICHPatRec::PhotonInBand() | |
503 | { | |
504 | //0=label for parameters giving internal band ellipse | |
505 | //1=label for parameters giving external band ellipse | |
506 | ||
237c933d | 507 | Float_t imp[2], mass[2], energy[2], beta[2]; |
508 | Float_t emissPointLength[2]; | |
509 | Float_t e1, e2, f1, f2; | |
e7257cad | 510 | Float_t nfreon[2], nquartz[2]; |
511 | Int_t times; | |
e0b63a71 | 512 | Float_t pointsOnCathode[3]; |
e7257cad | 513 | |
514 | Float_t phpad, thetacer[2]; | |
515 | Float_t bandradius[2], padradius; | |
516 | ||
517 | imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission | |
518 | imp[1] = 1.2; | |
519 | ||
520 | mass[0] = 0.938; //proton mass | |
521 | mass[1] = 0.139; //pion mass | |
522 | ||
237c933d | 523 | emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator |
524 | emissPointLength[1] = 0.;//at the end of radiator | |
e7257cad | 525 | |
526 | //parameters to calculate freon window refractive index vs. energy | |
527 | Float_t a = 1.177; | |
528 | Float_t b = 0.0172; | |
529 | ||
530 | //parameters to calculate quartz window refractive index vs. energy | |
531 | /* | |
532 | Energ[0] = 5.6; | |
533 | Energ[1] = 7.7; | |
534 | */ | |
237c933d | 535 | energy[0] = 5.0; |
536 | energy[1] = 8.0; | |
537 | e1 = 10.666; | |
538 | e2 = 18.125; | |
539 | f1 = 46.411; | |
540 | f2 = 228.71; | |
e7257cad | 541 | |
e7257cad | 542 | phpad = PhiPad(); |
543 | ||
544 | for (times=0; times<=1; times++) { | |
545 | ||
237c933d | 546 | nfreon[times] = a+b*energy[times]; |
e0b63a71 | 547 | //nfreon[times] = 1; |
e7257cad | 548 | |
00df6e79 | 549 | nquartz[times] = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(energy[times],2)))+ |
550 | (f2/(TMath::Power(e2,2)-TMath::Power(energy[times],2)))); | |
e7257cad | 551 | |
00df6e79 | 552 | beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2)); |
e7257cad | 553 | |
554 | thetacer[times] = CherenkovAngle( nfreon[times], beta[times]); | |
555 | ||
556 | bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times], | |
e0b63a71 | 557 | emissPointLength[times], |
558 | thetacer[times], phpad, pointsOnCathode); | |
559 | //printf(" ppp %f %f %f \n",pointsOnCathode); | |
560 | } | |
e7257cad | 561 | |
562 | bandradius[0] -= 1.6; | |
563 | bandradius[1] += 1.6; | |
00df6e79 | 564 | padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2)); |
e7257cad | 565 | // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]); |
566 | ||
567 | if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1; | |
568 | return 0; | |
569 | } | |
570 | ||
571 | Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz, | |
237c933d | 572 | Float_t emissPointLength, Float_t thetacer, |
e0b63a71 | 573 | Float_t phpad, Float_t pointsOnCathode[3]) |
e7257cad | 574 | { |
e7257cad | 575 | |
237c933d | 576 | // Find the distance to MIP impact |
577 | ||
578 | Float_t distanceValue; | |
579 | ||
580 | TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect | |
e7257cad | 581 | //to local reference sistem with the origin in the MIP entrance |
582 | ||
237c933d | 583 | TVector3 vectEmissPointLength(1,1,1); |
584 | Float_t magEmissPointLenght; | |
e7257cad | 585 | |
237c933d | 586 | TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect |
587 | Float_t magRadExitPhot2; | |
e7257cad | 588 | //to a reference sistem with origin in the photon emission point and |
589 | //axes parallel to the MIP reference sistem | |
590 | ||
237c933d | 591 | TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect |
592 | Float_t magQuarExitPhot; | |
e7257cad | 593 | // |
237c933d | 594 | TVector3 gapExitPhot(1,1,1) ; |
595 | Float_t magGapExitPhot; | |
e7257cad | 596 | // |
e0b63a71 | 597 | TVector3 PhotocatExitPhot(1,1,1); |
e7257cad | 598 | Double_t theta2; |
599 | Double_t thetarad , phirad ; | |
600 | Double_t thetaquar, phiquar; | |
601 | Double_t thetagap , phigap ; | |
602 | ||
603 | Float_t ngas = 1.; | |
604 | ||
237c933d | 605 | magEmissPointLenght = emissPointLength/cos(fTrackTheta); |
e7257cad | 606 | |
237c933d | 607 | vectEmissPointLength.SetMag(magEmissPointLenght); |
608 | vectEmissPointLength.SetTheta(fTrackTheta); | |
609 | vectEmissPointLength.SetPhi(fTrackPhi); | |
e7257cad | 610 | |
611 | ||
237c933d | 612 | radExitPhot2.SetTheta(thetacer); |
613 | radExitPhot2.SetPhi(phpad); | |
e7257cad | 614 | |
615 | ||
616 | TRotation r1; | |
617 | TRotation r2; | |
618 | TRotation r; | |
619 | ||
620 | r1. RotateY(fTrackTheta); | |
621 | r2. RotateZ(fTrackPhi); | |
622 | ||
623 | ||
624 | ||
625 | r = r2 * r1;//rotation about the y axis by MIP theta incidence angle | |
626 | //following by a rotation about the z axis by MIP phi incidence angle; | |
627 | ||
628 | ||
237c933d | 629 | radExitPhot2 = r * radExitPhot2; |
630 | theta2 = radExitPhot2.Theta(); | |
631 | magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2); | |
632 | radExitPhot2.SetMag(magRadExitPhot2); | |
e7257cad | 633 | |
634 | ||
237c933d | 635 | radExitPhot = vectEmissPointLength + radExitPhot2; |
636 | thetarad = radExitPhot.Theta(); | |
237c933d | 637 | phirad = radExitPhot.Phi(); //check on the original file // |
e7257cad | 638 | |
639 | thetaquar = SnellAngle( nfreon, nquartz, theta2); | |
237c933d | 640 | phiquar = radExitPhot2.Phi(); |
e7257cad | 641 | if(thetaquar == 999.) return thetaquar; |
237c933d | 642 | magQuarExitPhot = fQw/cos(thetaquar); |
643 | quarExitPhot.SetMag( magQuarExitPhot); | |
644 | quarExitPhot.SetTheta(thetaquar); | |
645 | quarExitPhot.SetPhi(phiquar); | |
e7257cad | 646 | |
647 | thetagap = SnellAngle( nquartz, ngas, thetaquar); | |
648 | phigap = phiquar; | |
649 | if(thetagap == 999.) return thetagap; | |
237c933d | 650 | magGapExitPhot = fTgap/cos(thetagap); |
651 | gapExitPhot.SetMag( magGapExitPhot); | |
652 | gapExitPhot.SetTheta(thetagap); | |
653 | gapExitPhot.SetPhi(phigap); | |
e7257cad | 654 | |
e0b63a71 | 655 | PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot; |
e7257cad | 656 | |
e0b63a71 | 657 | distanceValue = sqrt(TMath::Power(PhotocatExitPhot(0),2) |
658 | +TMath::Power(PhotocatExitPhot(1),2)); | |
659 | pointsOnCathode[0] = (Float_t) PhotocatExitPhot(0) + fXshift - fTrackLoc[0]; | |
660 | pointsOnCathode[1] = (Float_t) PhotocatExitPhot(1) + fYshift - fTrackLoc[1]; | |
661 | pointsOnCathode[2] = (Float_t) PhotocatExitPhot(2); | |
662 | ||
663 | //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]); | |
664 | ||
665 | return distanceValue; | |
666 | ||
667 | } | |
e7257cad | 668 | |
669 | Float_t AliRICHPatRec::PhiPad() | |
670 | { | |
237c933d | 671 | |
672 | // ?? | |
673 | ||
e7257cad | 674 | Float_t zpad; |
675 | Float_t thetapad, phipad; | |
676 | Float_t thetarot, phirot; | |
677 | ||
678 | zpad = fRw + fQw + fTgap; | |
679 | ||
237c933d | 680 | TVector3 photonPad(fXpad, fYpad, zpad); |
681 | thetapad = photonPad.Theta(); | |
682 | phipad = photonPad.Phi(); | |
e7257cad | 683 | |
684 | TRotation r1; | |
685 | TRotation r2; | |
686 | TRotation r; | |
687 | ||
688 | thetarot = - fTrackTheta; | |
689 | phirot = - fTrackPhi; | |
690 | r1. RotateZ(phirot); | |
691 | r2. RotateY(thetarot); | |
692 | ||
693 | r = r2 * r1;//rotation about the z axis by MIP -phi incidence angle | |
694 | //following by a rotation about the y axis by MIP -theta incidence angle; | |
695 | ||
237c933d | 696 | photonPad = r * photonPad; |
e7257cad | 697 | |
237c933d | 698 | phipad = photonPad.Phi(); |
e7257cad | 699 | |
700 | return phipad; | |
701 | } | |
702 | ||
703 | Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1) | |
704 | { | |
237c933d | 705 | |
706 | // Compute the Snell angle | |
707 | ||
e7257cad | 708 | Float_t sinrefractangle; |
709 | Float_t refractangle; | |
710 | ||
711 | sinrefractangle = (n1/n2)*sin(theta1); | |
712 | ||
713 | if(sinrefractangle>1.) { | |
714 | refractangle = 999.; | |
715 | return refractangle; | |
716 | } | |
717 | ||
718 | refractangle = asin(sinrefractangle); | |
719 | return refractangle; | |
720 | } | |
721 | ||
722 | Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta) | |
723 | { | |
237c933d | 724 | |
725 | // Compute the cerenkov angle | |
726 | ||
e7257cad | 727 | Float_t thetacer; |
728 | ||
729 | if((n*beta)<1.) { | |
730 | thetacer = 999.; | |
731 | return thetacer; | |
732 | } | |
733 | ||
734 | thetacer = acos (1./(n*beta)); | |
735 | return thetacer; | |
736 | } | |
737 | ||
738 | Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta) | |
739 | { | |
237c933d | 740 | |
741 | // Find beta | |
742 | ||
e7257cad | 743 | Float_t beta; |
744 | ||
745 | beta = 1./(n*cos(theta)); | |
746 | return beta; | |
747 | } | |
748 | ||
749 | ||
750 | ||
751 | ||
752 | void AliRICHPatRec::HoughResponse() | |
753 | ||
754 | { | |
237c933d | 755 | |
756 | // Implement Hough response pat. rec. method | |
757 | ||
e7257cad | 758 | int bin=0; |
759 | int bin1=0; | |
760 | int bin2=0; | |
237c933d | 761 | int i, j, k, nCorrBand; |
762 | int etaBin = 750; | |
763 | float hcs[750]; | |
764 | float angle, thetaCerMean; | |
e7257cad | 765 | |
237c933d | 766 | float etaPeak[30]; |
767 | float etaMin = 0.00; | |
768 | float etaMax = 0.75; | |
769 | float stepEta = 0.001; | |
770 | float windowEta = 0.040; | |
e7257cad | 771 | |
237c933d | 772 | int nBin; |
e7257cad | 773 | |
237c933d | 774 | float etaPeakPos = -1; |
775 | Int_t etaPeakCount = -1; | |
e7257cad | 776 | |
237c933d | 777 | thetaCerMean = 0.; |
e7257cad | 778 | fThetaCerenkov = 0.; |
779 | ||
237c933d | 780 | nBin = (int)(0.5+etaMax/(stepEta)); |
781 | nCorrBand = (int)(0.5+ windowEta/(2 * stepEta)); | |
782 | memset ((void *)hcs, 0, etaBin*sizeof(int)); | |
e7257cad | 783 | |
784 | for (k=0; k< fNumEtaPhotons; k++) { | |
785 | ||
786 | angle = fEtaPhotons[k]; | |
787 | ||
237c933d | 788 | if (angle>=etaMin && angle<= etaMax) { |
789 | bin = (int)(0.5+angle/(stepEta)); | |
790 | bin1= bin-nCorrBand; | |
791 | bin2= bin+nCorrBand; | |
e7257cad | 792 | if (bin1<0) bin1=0; |
237c933d | 793 | if (bin2>nBin) bin2=nBin; |
e7257cad | 794 | |
795 | for (j=bin1; j<bin2; j++) { | |
237c933d | 796 | hcs[j] += fWeightPhotons[k]; |
e7257cad | 797 | } |
798 | ||
237c933d | 799 | thetaCerMean += angle; |
e7257cad | 800 | } |
801 | } | |
802 | ||
237c933d | 803 | thetaCerMean /= fNumEtaPhotons; |
e7257cad | 804 | |
237c933d | 805 | HoughFiltering(hcs); |
806 | ||
807 | for (bin=0; bin <nBin; bin++) { | |
808 | angle = (bin+0.5) * (stepEta); | |
809 | if (hcs[bin] && hcs[bin] > etaPeakPos) { | |
810 | etaPeakCount = 0; | |
811 | etaPeakPos = hcs[bin]; | |
812 | etaPeak[0]=angle; | |
e7257cad | 813 | } |
814 | else { | |
237c933d | 815 | if (hcs[bin] == etaPeakPos) { |
816 | etaPeak[++etaPeakCount] = angle; | |
e7257cad | 817 | } |
818 | } | |
819 | } | |
820 | ||
237c933d | 821 | for (i=0; i<etaPeakCount+1; i++) { |
822 | fThetaCerenkov += etaPeak[i]; | |
e7257cad | 823 | } |
237c933d | 824 | if (etaPeakCount>=0) { |
825 | fThetaCerenkov /= etaPeakCount+1; | |
826 | fThetaPeakPos = etaPeakPos; | |
e7257cad | 827 | } |
828 | } | |
829 | ||
830 | ||
237c933d | 831 | void AliRICHPatRec::HoughFiltering(float hcs[]) |
e7257cad | 832 | { |
237c933d | 833 | |
834 | // hough filtering | |
835 | ||
836 | float hcsFilt[750]; | |
837 | float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05}; | |
838 | int nx, i, nxDx; | |
e7257cad | 839 | int sizeHCS; |
237c933d | 840 | int nBin; |
e7257cad | 841 | |
237c933d | 842 | int etaBin = 750; |
843 | float etaMax = 0.75; | |
844 | float stepEta = 0.001; | |
e7257cad | 845 | |
237c933d | 846 | nBin = (int)(1+etaMax/stepEta); |
847 | sizeHCS = etaBin*sizeof(float); | |
e7257cad | 848 | |
237c933d | 849 | memset ((void *)hcsFilt, 0, sizeHCS); |
e7257cad | 850 | |
237c933d | 851 | for (nx = 0; nx < nBin; nx++) { |
e7257cad | 852 | for (i = 0; i < 5; i++) { |
237c933d | 853 | nxDx = nx + (i-2); |
854 | if (nxDx> -1 && nxDx<nBin) | |
855 | hcsFilt[nx] += hcs[nxDx] * k[i]; | |
e7257cad | 856 | } |
857 | } | |
858 | ||
237c933d | 859 | for (nx = 0; nx < nBin; nx++) { |
860 | hcs[nx] = hcsFilt[nx]; | |
e7257cad | 861 | } |
862 | } | |
863 | ||
e0b63a71 | 864 | /*void AliRICHPatRec::CerenkovRingDrawing() |
e7257cad | 865 | { |
866 | ||
867 | //to draw Cherenkov ring by known Cherenkov angle | |
868 | ||
e0b63a71 | 869 | Int_t nmaxdegrees; |
870 | Int_t Nphpad; | |
871 | Float_t phpad; | |
237c933d | 872 | Float_t nfreonave, nquartzave; |
873 | Float_t aveEnerg; | |
874 | Float_t energy[2]; | |
875 | Float_t e1, e2, f1, f2; | |
876 | Float_t bandradius; | |
e0b63a71 | 877 | |
e7257cad | 878 | //parameters to calculate freon window refractive index vs. energy |
e0b63a71 | 879 | |
237c933d | 880 | Float_t a = 1.177; |
881 | Float_t b = 0.0172; | |
882 | ||
e7257cad | 883 | //parameters to calculate quartz window refractive index vs. energy |
e0b63a71 | 884 | |
237c933d | 885 | energy[0] = 5.0; |
886 | energy[1] = 8.0; | |
887 | e1 = 10.666; | |
888 | e2 = 18.125; | |
889 | f1 = 46.411; | |
890 | f2 = 228.71; | |
891 | ||
e7257cad | 892 | |
e0b63a71 | 893 | nmaxdegrees = 36; |
237c933d | 894 | |
e0b63a71 | 895 | for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) { |
896 | ||
897 | phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad; | |
e7257cad | 898 | |
237c933d | 899 | aveEnerg = (energy[0]+energy[1])/2.; |
900 | ||
901 | nfreonave = a+b*aveEnerg; | |
00df6e79 | 902 | nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+ |
903 | (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2)))); | |
237c933d | 904 | |
237c933d | 905 | bandradius = DistanceFromMip(nfreonave, nquartzave, |
e0b63a71 | 906 | fEmissPoint,fThetaCerenkov, phpad); |
e7257cad | 907 | |
e0b63a71 | 908 | fCoordEllipse[0][Nphpad] = fOnCathode[0]; |
909 | fCoordEllipse[1][Nphpad] = fOnCathode[1]; | |
910 | printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]); | |
237c933d | 911 | |
237c933d | 912 | } |
913 | ||
e0b63a71 | 914 | }*/ |
e7257cad | 915 | |
e7257cad | 916 |