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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 | ||
803d1ab0 | 16 | /* $Id$ */ |
e7257cad | 17 | |
853634d3 | 18 | |
b251a2b5 | 19 | #include "AliRICHSDigit.h" |
237c933d | 20 | #include "AliRICHDigit.h" |
21 | #include "AliRICHRawCluster.h" | |
4a5c8776 | 22 | #include "AliRICHRecHit1D.h" |
e7257cad | 23 | #include "AliRun.h" |
24 | #include "AliDetector.h" | |
25 | #include "AliRICH.h" | |
26 | #include "AliRICHPoints.h" | |
a2f7eaf6 | 27 | #include "AliSegmentation.h" |
e7257cad | 28 | #include "AliRICHPatRec.h" |
29 | #include "AliRICH.h" | |
30 | #include "AliRICHConst.h" | |
31 | #include "AliRICHPoints.h" | |
32 | #include "AliConst.h" | |
a2f7eaf6 | 33 | #include "AliHitMap.h" |
237c933d | 34 | |
35 | #include <TParticle.h> | |
36 | #include <TMath.h> | |
37 | #include <TRandom.h> | |
38 | #include <TCanvas.h> | |
39 | #include <TH2.h> | |
94de3818 | 40 | #include <TTree.h> |
e7257cad | 41 | |
42 | ||
43 | ClassImp(AliRICHPatRec) | |
44 | //___________________________________________ | |
45 | AliRICHPatRec::AliRICHPatRec() : TObject() | |
46 | { | |
237c933d | 47 | // Default constructor |
48 | ||
e7257cad | 49 | //fChambers = 0; |
50 | } | |
51 | //___________________________________________ | |
52 | AliRICHPatRec::AliRICHPatRec(const char *name, const char *title) | |
53 | : TObject() | |
54 | { | |
237c933d | 55 | //Constructor for Bari's pattern recogniton method object |
e7257cad | 56 | } |
57 | ||
58 | void AliRICHPatRec::PatRec() | |
59 | { | |
60 | ||
237c933d | 61 | // Pattern recognition algorithm |
62 | ||
e7257cad | 63 | AliRICHChamber* iChamber; |
a2f7eaf6 | 64 | AliSegmentation* segmentation; |
e7257cad | 65 | |
237c933d | 66 | Int_t ntracks, ndigits[kNCH]; |
e7257cad | 67 | Int_t itr, ich, i; |
237c933d | 68 | Int_t goodPhotons; |
e7257cad | 69 | Int_t x,y,q; |
a2f7eaf6 | 70 | Float_t rx,ry,rz; |
e7257cad | 71 | Int_t nent,status; |
e0b63a71 | 72 | Int_t padsUsedX[100]; |
73 | Int_t padsUsedY[100]; | |
e7257cad | 74 | |
e0b63a71 | 75 | Float_t rechit[7]; |
e7257cad | 76 | |
8eb3caf9 | 77 | //printf("PatRec started\n"); |
e7257cad | 78 | |
237c933d | 79 | AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH"); |
88cb7938 | 80 | TTree *treeH = pRICH->TreeH(); |
e7257cad | 81 | |
237c933d | 82 | ntracks =(Int_t) treeH->GetEntries(); |
e7257cad | 83 | // ntracks = 1; |
84 | for (itr=0; itr<ntracks; itr++) { | |
85 | ||
74f08360 | 86 | status = TrackParam(itr,ich,0,0); |
e7257cad | 87 | if(status==1) continue; |
e0b63a71 | 88 | //printf(" theta %f phi %f track \n",fTrackTheta,fTrackPhi); |
e7257cad | 89 | // ring->Fill(fTrackLoc[0],fTrackLoc[1],100.); |
90 | ||
237c933d | 91 | iChamber = &(pRICH->Chamber(ich)); |
e7257cad | 92 | segmentation=iChamber->GetSegmentationModel(); |
93 | ||
94 | nent=(Int_t)gAlice->TreeD()->GetEntries(); | |
8eb3caf9 | 95 | gAlice->TreeD()->GetEvent(0); |
237c933d | 96 | TClonesArray *pDigitss = pRICH->DigitsAddress(ich); |
97 | ndigits[ich] = pDigitss->GetEntriesFast(); | |
e0b63a71 | 98 | printf("Digits in chamber %d: %d\n",ich,ndigits[ich]); |
e7257cad | 99 | AliRICHDigit *padI = 0; |
100 | ||
237c933d | 101 | goodPhotons = 0; |
e7257cad | 102 | |
103 | for (Int_t dig=0;dig<ndigits[ich];dig++) { | |
237c933d | 104 | padI=(AliRICHDigit*) pDigitss->UncheckedAt(dig); |
6e585aa2 | 105 | x=padI->PadX(); |
106 | y=padI->PadY(); | |
107 | q=padI->Signal(); | |
a2f7eaf6 | 108 | segmentation->GetPadC(x,y,rx,ry,rz); |
e7257cad | 109 | |
e0b63a71 | 110 | //printf("Pad coordinates x:%d, Real coordinates x:%f\n",x,rx); |
111 | //printf("Pad coordinates y:%d, Real coordinates y:%f\n",y,ry); | |
112 | ||
e7257cad | 113 | fXpad = rx-fXshift; |
114 | fYpad = ry-fYshift; | |
115 | fQpad = q; | |
116 | ||
e7257cad | 117 | fCerenkovAnglePad = PhotonCerenkovAngle(); |
118 | if(fCerenkovAnglePad==-999) continue; | |
119 | ||
120 | if(!PhotonInBand()) continue; | |
121 | ||
e0b63a71 | 122 | Int_t xpad; |
123 | Int_t ypad; | |
124 | ||
a2f7eaf6 | 125 | segmentation->GetPadI(fXpad,fYpad,0,xpad,ypad); |
e7257cad | 126 | |
e0b63a71 | 127 | padsUsedX[goodPhotons]=xpad; |
128 | padsUsedY[goodPhotons]=ypad; | |
129 | ||
237c933d | 130 | goodPhotons++; |
e0b63a71 | 131 | fEtaPhotons[goodPhotons-1] = fCerenkovAnglePad; |
e7257cad | 132 | } |
237c933d | 133 | fNumEtaPhotons = goodPhotons; |
e7257cad | 134 | |
135 | BackgroundEstimation(); | |
136 | ||
e7257cad | 137 | HoughResponse(); |
e0b63a71 | 138 | //CerenkovRingDrawing(); |
e7257cad | 139 | |
140 | rechit[0] = 0; | |
141 | rechit[1] = 0; | |
142 | rechit[2] = fThetaCerenkov; | |
e0b63a71 | 143 | rechit[3] = fXshift + fTrackLoc[0]; |
144 | rechit[4] = fYshift + fTrackLoc[1]; | |
145 | rechit[5] = fEmissPoint; | |
146 | rechit[6] = goodPhotons; | |
e7257cad | 147 | |
e0b63a71 | 148 | //printf("Center coordinates:%f %f\n",rechit[3],rechit[4]); |
e7257cad | 149 | |
4a5c8776 | 150 | pRICH->AddRecHit1D(ich,rechit,fEtaPhotons,padsUsedX,padsUsedY); |
e7257cad | 151 | |
e7257cad | 152 | } |
153 | ||
154 | gAlice->TreeR()->Fill(); | |
155 | TClonesArray *fRec; | |
237c933d | 156 | for (i=0;i<kNCH;i++) { |
4a5c8776 | 157 | fRec=pRICH->RecHitsAddress1D(i); |
e7257cad | 158 | int ndig=fRec->GetEntriesFast(); |
159 | printf ("Chamber %d, rings %d\n",i,ndig); | |
160 | } | |
4a5c8776 | 161 | pRICH->ResetRecHits1D(); |
e7257cad | 162 | |
e7257cad | 163 | } |
164 | ||
165 | ||
74f08360 | 166 | Int_t AliRICHPatRec::TrackParam(Int_t itr, Int_t &ich, Float_t rectheta, Float_t recphi) |
e7257cad | 167 | { |
168 | // Get Local coordinates of track impact | |
169 | ||
170 | AliRICHChamber* iChamber; | |
a2f7eaf6 | 171 | AliSegmentation* segmentation; |
e7257cad | 172 | |
173 | Float_t trackglob[3]; | |
174 | Float_t trackloc[3]; | |
175 | Float_t thetatr; | |
176 | Float_t phitr; | |
177 | Float_t iloss; | |
178 | Float_t part; | |
179 | Float_t pX, pY, pZ; | |
180 | ||
4a5c8776 | 181 | //printf("Calling TrackParam\n"); |
e7257cad | 182 | |
183 | gAlice->ResetHits(); | |
88cb7938 | 184 | AliRICH *pRICH = (AliRICH*)gAlice->GetDetector("RICH"); |
185 | TTree *treeH = pRICH->TreeH(); | |
237c933d | 186 | treeH->GetEvent(itr); |
e7257cad | 187 | |
853634d3 | 188 | AliRICHhit* mHit=(AliRICHhit*)pRICH->FirstHit(-1); |
e7257cad | 189 | if(mHit==0) return 1; |
6e585aa2 | 190 | ich = mHit->Chamber()-1; |
94de3818 | 191 | trackglob[0] = mHit->X(); |
192 | trackglob[1] = mHit->Y(); | |
193 | trackglob[2] = mHit->Z(); | |
6e585aa2 | 194 | pX = mHit->MomX(); |
195 | pY = mHit->MomY(); | |
196 | pZ = mHit->MomZ(); | |
00df6e79 | 197 | fTrackMom = sqrt(TMath::Power(pX,2)+TMath::Power(pY,2)+TMath::Power(pZ,2)); |
74f08360 | 198 | if(recphi!=0 || rectheta!=0) |
199 | { | |
200 | thetatr = rectheta; | |
201 | phitr = recphi; | |
202 | } | |
203 | else | |
204 | { | |
6e585aa2 | 205 | thetatr = mHit->Theta()*TMath::Pi()/180; |
206 | phitr = mHit->Phi()*TMath::Pi()/180; | |
74f08360 | 207 | } |
6e585aa2 | 208 | iloss = mHit->Loss(); |
209 | part = mHit->Particle(); | |
e7257cad | 210 | |
237c933d | 211 | iChamber = &(pRICH->Chamber(ich)); |
e7257cad | 212 | iChamber->GlobaltoLocal(trackglob,trackloc); |
213 | ||
214 | segmentation=iChamber->GetSegmentationModel(); | |
215 | ||
216 | // retrieve geometrical params | |
217 | ||
218 | AliRICHGeometry* fGeometry=iChamber->GetGeometryModel(); | |
219 | ||
220 | fRw = fGeometry->GetFreonThickness(); | |
221 | fQw = fGeometry->GetQuartzThickness(); | |
e0b63a71 | 222 | fTgap = fGeometry->GetGapThickness(); |
223 | Float_t radiatorToPads= fGeometry->GetRadiatorToPads(); | |
224 | //+ fGeometry->GetProximityGapThickness(); | |
e7257cad | 225 | |
e0b63a71 | 226 | //printf("Distance to pads. From geometry:%f, From calculations:%f\n",radiatorToPads,fRw + fQw + fTgap); |
227 | ||
228 | //Float_t apar = (fRw + fQw + fTgap)*tan(thetatr); | |
229 | Float_t apar = radiatorToPads*tan(thetatr); | |
e7257cad | 230 | fTrackLoc[0] = apar*cos(phitr); |
231 | fTrackLoc[1] = apar*sin(phitr); | |
e0b63a71 | 232 | //fTrackLoc[2] = fRw + fQw + fTgap; |
233 | fTrackLoc[2] = radiatorToPads; | |
e7257cad | 234 | fTrackTheta = thetatr; |
235 | fTrackPhi = phitr; | |
236 | ||
237 | fXshift = trackloc[0] - fTrackLoc[0]; | |
238 | fYshift = trackloc[2] - fTrackLoc[1]; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | Float_t AliRICHPatRec::EstimationAtLimits(Float_t lim, Float_t radius, | |
244 | Float_t phiphot) | |
245 | { | |
237c933d | 246 | |
247 | // Estimation of emission point | |
248 | ||
e7257cad | 249 | Float_t nquartz = 1.585; |
250 | Float_t ngas = 1.; | |
251 | Float_t nfreon = 1.295; | |
252 | Float_t value; | |
253 | ||
254 | // printf("Calling EstimationLimits\n"); | |
255 | ||
256 | Float_t apar = (fRw -fEmissPoint + fQw + fTgap)*tan(fTrackTheta); | |
257 | Float_t b1 = (fRw-fEmissPoint)*tan(lim); | |
00df6e79 | 258 | Float_t b2 = fQw / sqrt(TMath::Power(nquartz,2)-TMath::Power(nfreon*sin(lim),2)); |
259 | Float_t b3 = fTgap / sqrt(TMath::Power(ngas,2)-TMath::Power(nfreon*sin(lim),2)); | |
e7257cad | 260 | Float_t bpar = b1 + nfreon*sin(lim)*(b2+b3); |
00df6e79 | 261 | value = TMath::Power(radius,2) |
262 | -TMath::Power((apar*cos(fTrackPhi)-bpar*cos(phiphot)),2) | |
263 | -TMath::Power((apar*sin(fTrackPhi)-bpar*sin(phiphot)),2); | |
e7257cad | 264 | return value; |
265 | } | |
266 | ||
267 | ||
268 | Float_t AliRICHPatRec::PhotonCerenkovAngle() | |
269 | { | |
270 | // Cherenkov pad angle reconstruction | |
271 | ||
272 | Float_t radius; | |
273 | Float_t cherMin = 0; | |
274 | Float_t cherMax = 0.8; | |
275 | Float_t phiphot; | |
276 | Float_t eps = 0.0001; | |
277 | Int_t niterEmiss = 0; | |
278 | Int_t niterEmissMax = 0; | |
237c933d | 279 | Float_t x1,x2,x3=0,p1,p2,p3; |
e7257cad | 280 | Float_t argY,argX; |
281 | Int_t niterFun; | |
282 | ||
283 | // printf("Calling PhotonCerenkovAngle\n"); | |
284 | ||
00df6e79 | 285 | radius = sqrt(TMath::Power(fTrackLoc[0]-fXpad,2)+TMath::Power(fTrackLoc[1]-fYpad,2)); |
e7257cad | 286 | fEmissPoint = fRw/2.; //Start value of EmissionPoint |
287 | ||
288 | while(niterEmiss<=niterEmissMax) { | |
289 | ||
290 | niterFun = 0; | |
291 | argY = fYpad - fEmissPoint*tan(fTrackTheta)*sin(fTrackPhi); | |
292 | argX = fXpad - fEmissPoint*tan(fTrackTheta)*cos(fTrackPhi); | |
293 | phiphot = atan2(argY,argX); | |
294 | p1 = EstimationAtLimits(cherMin,radius,phiphot); | |
295 | p2 = EstimationAtLimits(cherMax,radius,phiphot); | |
296 | if(p1*p2>0) | |
297 | { | |
298 | // printf("PhotonCerenkovAngle failed\n"); | |
299 | return -999; | |
300 | } | |
301 | ||
302 | //start to find the Cherenkov pad angle | |
303 | x1 = cherMin; | |
304 | x2 = cherMax; | |
305 | x3 = (x1+x2)/2.; | |
306 | p3 = EstimationAtLimits(x3,radius,phiphot); | |
307 | while(TMath::Abs(p3)>eps){ | |
308 | if(p1*p3<0) x2 = x3; | |
309 | if(p1*p3>0) { | |
310 | x1 = x3; | |
311 | p1 = EstimationAtLimits(x1,radius,phiphot); | |
312 | } | |
313 | x3 = (x1+x2)/2.; | |
314 | p3 = EstimationAtLimits(x3,radius,phiphot); | |
315 | niterFun++; | |
316 | ||
317 | if(niterFun>=1000) { | |
318 | // printf(" max iterations in PhotonCerenkovAngle\n"); | |
319 | return x3; | |
320 | } | |
321 | } | |
322 | // printf("niterFun %i \n",niterFun); | |
323 | niterEmiss++; | |
324 | if (niterEmiss != niterEmissMax+1) EmissionPoint(); | |
325 | } | |
326 | /* | |
327 | printf(" phiphot %f fXpad %f fYpad %f fEmiss %f \n", | |
328 | phiphot,fXpad,fYpad,fEmissPoint); | |
329 | */ | |
330 | ||
331 | return x3; | |
332 | ||
333 | } | |
334 | ||
335 | ||
336 | void AliRICHPatRec::EmissionPoint() | |
337 | { | |
237c933d | 338 | |
339 | // Find emission point | |
340 | ||
341 | Float_t absorbtionLength=7.83*fRw; //absorption length in the freon (cm) | |
e7257cad | 342 | // 7.83 = -1/ln(T0) where |
343 | // T0->Trasmission freon at 180nm = 0.88 (Eph=6.85eV) | |
237c933d | 344 | Float_t photonLength, photonLengthMin, photonLengthMax; |
e7257cad | 345 | |
237c933d | 346 | photonLength=exp(-fRw/(absorbtionLength*cos(fCerenkovAnglePad))); |
347 | photonLengthMin=fRw*photonLength/(1.-photonLength); | |
348 | photonLengthMax=absorbtionLength*cos(fCerenkovAnglePad); | |
349 | fEmissPoint = fRw + photonLengthMin - photonLengthMax; | |
e7257cad | 350 | |
351 | } | |
352 | ||
353 | void AliRICHPatRec::PhotonSelection(Int_t track, Int_t &nphot, Float_t &thetamean) | |
354 | { | |
237c933d | 355 | |
356 | // not implemented yet | |
357 | ||
e7257cad | 358 | printf("Calling PhotonSelection\n"); |
359 | } | |
360 | ||
361 | void AliRICHPatRec::BackgroundEstimation() | |
362 | { | |
237c933d | 363 | |
364 | // estimate background noise | |
365 | ||
366 | Float_t stepEta = 0.001; | |
367 | Float_t etaMinBkg = 0.72; | |
368 | Float_t etaMaxBkg = 0.75; | |
369 | Float_t etaMin = 0.; | |
370 | Float_t etaMax = 0.75; | |
e7257cad | 371 | Float_t ngas = 1.; |
372 | Float_t nfreon = 1.295; | |
373 | ||
237c933d | 374 | Float_t etaStepMin,etaStepMax,etaStepAvg; |
e7257cad | 375 | Int_t i,ip,nstep; |
237c933d | 376 | Int_t numPhotBkg, numPhotonStep; |
377 | Float_t funBkg,areaBkg,normBkg; | |
378 | Float_t densityBkg,storeBkg,numStore; | |
379 | Float_t thetaSig; | |
e7257cad | 380 | |
237c933d | 381 | numPhotBkg = 0; |
382 | areaBkg = 0.; | |
e7257cad | 383 | |
237c933d | 384 | nstep = (int)((etaMaxBkg-etaMinBkg)/stepEta); |
e7257cad | 385 | |
386 | for (i=0;i<fNumEtaPhotons;i++) { | |
387 | ||
237c933d | 388 | if(fEtaPhotons[i]>etaMinBkg && fEtaPhotons[i]<etaMaxBkg) { |
389 | numPhotBkg++; | |
e7257cad | 390 | } |
391 | } | |
237c933d | 392 | if (numPhotBkg == 0) { |
e7257cad | 393 | for (i=0;i<fNumEtaPhotons;i++) { |
394 | fWeightPhotons[i] = 1.; | |
395 | } | |
396 | return; | |
397 | } | |
398 | ||
237c933d | 399 | // printf(" numPhotBkg %i ",numPhotBkg); |
e7257cad | 400 | |
401 | for (i=0;i<nstep;i++) { | |
237c933d | 402 | etaStepMin = etaMinBkg + (Float_t)(i)*stepEta; |
403 | etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta; | |
404 | etaStepAvg = 0.5*(etaStepMax + etaStepMin); | |
e7257cad | 405 | /* |
00df6e79 | 406 | funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)), |
237c933d | 407 | 5.52)-7.803 + 22.02*tan(etaStepAvg); |
e7257cad | 408 | */ |
4a5c8776 | 409 | |
410 | //printf("etaStepAvg: %f, etaStepMax: %f, etaStepMin: %f", etaStepAvg,etaStepMax,etaStepMin); | |
411 | ||
412 | thetaSig = TMath::ASin(nfreon/ngas*TMath::Sin(etaStepAvg)); | |
00df6e79 | 413 | funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon |
237c933d | 414 | /ngas*cos(etaStepAvg)/cos(thetaSig); |
415 | areaBkg += stepEta*funBkg; | |
e7257cad | 416 | } |
417 | ||
237c933d | 418 | densityBkg = 0.95*(Float_t)(numPhotBkg)/areaBkg; |
419 | // printf(" densityBkg %f \n",densityBkg); | |
e7257cad | 420 | |
237c933d | 421 | nstep = (int)((etaMax-etaMin)/stepEta); |
422 | storeBkg = 0.; | |
423 | numStore = 0; | |
e7257cad | 424 | for (i=0;i<nstep;i++) { |
237c933d | 425 | etaStepMin = etaMinBkg + (Float_t)(i)*stepEta; |
426 | etaStepMax = etaMinBkg + (Float_t)(i+1)*stepEta; | |
427 | etaStepAvg = 0.5*(etaStepMax + etaStepMin); | |
e7257cad | 428 | /* |
00df6e79 | 429 | funBkg = tan(etaStepAvg)*TMath::Power((1.+TMath::Power(tan(etaStepAvg),2)), |
237c933d | 430 | 5.52)-7.803 + 22.02*tan(etaStepAvg); |
e7257cad | 431 | */ |
432 | ||
237c933d | 433 | thetaSig = asin(nfreon/ngas*sin(etaStepAvg)); |
00df6e79 | 434 | funBkg = tan(thetaSig)*(1.+TMath::Power(tan(thetaSig),2))*nfreon |
237c933d | 435 | /ngas*cos(etaStepAvg)/cos(thetaSig); |
e7257cad | 436 | |
237c933d | 437 | areaBkg = stepEta*funBkg; |
438 | normBkg = densityBkg*areaBkg; | |
439 | numPhotonStep = 0; | |
e7257cad | 440 | for (ip=0;ip<fNumEtaPhotons;ip++) { |
237c933d | 441 | if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) { |
442 | numPhotonStep++; | |
e7257cad | 443 | } |
444 | } | |
237c933d | 445 | if (numPhotonStep == 0) { |
446 | storeBkg += normBkg; | |
447 | numStore++; | |
448 | if (numStore>50) { | |
449 | numStore = 0; | |
450 | storeBkg = 0.; | |
e7257cad | 451 | } |
452 | } | |
237c933d | 453 | if (numPhotonStep == 0) continue; |
e7257cad | 454 | for (ip=0;ip<fNumEtaPhotons;ip++) { |
237c933d | 455 | if(fEtaPhotons[ip]>etaStepMin && fEtaPhotons[ip]<etaStepMax) { |
456 | normBkg +=storeBkg; | |
457 | storeBkg = 0; | |
458 | numStore = 0; | |
459 | fWeightPhotons[ip] = 1. - normBkg/(Float_t)(numPhotonStep); | |
e7257cad | 460 | /* |
237c933d | 461 | printf(" normBkg %f numPhotonStep %i fW %f \n", |
462 | normBkg, numPhotonStep, fWeightPhotons[ip]); | |
e7257cad | 463 | */ |
464 | if(fWeightPhotons[ip]<0) fWeightPhotons[ip] = 0.; | |
465 | } | |
466 | } | |
467 | } | |
468 | } | |
469 | ||
470 | ||
471 | void AliRICHPatRec::FlagPhotons(Int_t track, Float_t theta) | |
472 | { | |
237c933d | 473 | |
474 | // not implemented yet | |
475 | ||
e7257cad | 476 | printf("Calling FlagPhotons\n"); |
477 | } | |
478 | ||
479 | ||
480 | ////////////////////////////////////////// | |
481 | ||
482 | ||
483 | ||
484 | ||
485 | ||
486 | Int_t AliRICHPatRec::PhotonInBand() | |
487 | { | |
488 | //0=label for parameters giving internal band ellipse | |
489 | //1=label for parameters giving external band ellipse | |
490 | ||
237c933d | 491 | Float_t imp[2], mass[2], energy[2], beta[2]; |
492 | Float_t emissPointLength[2]; | |
493 | Float_t e1, e2, f1, f2; | |
e7257cad | 494 | Float_t nfreon[2], nquartz[2]; |
495 | Int_t times; | |
e0b63a71 | 496 | Float_t pointsOnCathode[3]; |
e7257cad | 497 | |
498 | Float_t phpad, thetacer[2]; | |
499 | Float_t bandradius[2], padradius; | |
500 | ||
501 | imp[0] = 5.0; //threshold momentum for the proton Cherenkov emission | |
502 | imp[1] = 1.2; | |
503 | ||
504 | mass[0] = 0.938; //proton mass | |
505 | mass[1] = 0.139; //pion mass | |
506 | ||
237c933d | 507 | emissPointLength[0] = fRw-0.0001; //at the beginning of the radiator |
508 | emissPointLength[1] = 0.;//at the end of radiator | |
e7257cad | 509 | |
510 | //parameters to calculate freon window refractive index vs. energy | |
511 | Float_t a = 1.177; | |
512 | Float_t b = 0.0172; | |
513 | ||
514 | //parameters to calculate quartz window refractive index vs. energy | |
515 | /* | |
516 | Energ[0] = 5.6; | |
517 | Energ[1] = 7.7; | |
518 | */ | |
237c933d | 519 | energy[0] = 5.0; |
520 | energy[1] = 8.0; | |
521 | e1 = 10.666; | |
522 | e2 = 18.125; | |
523 | f1 = 46.411; | |
524 | f2 = 228.71; | |
e7257cad | 525 | |
74f08360 | 526 | phpad = PhiPad(fTrackTheta,fTrackPhi); |
e7257cad | 527 | |
528 | for (times=0; times<=1; times++) { | |
529 | ||
237c933d | 530 | nfreon[times] = a+b*energy[times]; |
e0b63a71 | 531 | //nfreon[times] = 1; |
e7257cad | 532 | |
00df6e79 | 533 | nquartz[times] = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(energy[times],2)))+ |
534 | (f2/(TMath::Power(e2,2)-TMath::Power(energy[times],2)))); | |
e7257cad | 535 | |
00df6e79 | 536 | beta[times] = imp[times]/sqrt(TMath::Power(imp[times],2)+TMath::Power(mass[times],2)); |
e7257cad | 537 | |
538 | thetacer[times] = CherenkovAngle( nfreon[times], beta[times]); | |
539 | ||
540 | bandradius[times] = DistanceFromMip( nfreon[times], nquartz[times], | |
e0b63a71 | 541 | emissPointLength[times], |
74f08360 | 542 | thetacer[times], phpad, pointsOnCathode,fTrackTheta,fTrackPhi); |
e0b63a71 | 543 | //printf(" ppp %f %f %f \n",pointsOnCathode); |
544 | } | |
e7257cad | 545 | |
546 | bandradius[0] -= 1.6; | |
547 | bandradius[1] += 1.6; | |
00df6e79 | 548 | padradius = sqrt(TMath::Power(fXpad,2)+TMath::Power(fYpad,2)); |
e7257cad | 549 | // printf(" rmin %f r %f rmax %f \n",bandradius[0],padradius,bandradius[1]); |
550 | ||
551 | if(padradius>=bandradius[0] && padradius<=bandradius[1]) return 1; | |
552 | return 0; | |
553 | } | |
554 | ||
555 | Float_t AliRICHPatRec::DistanceFromMip(Float_t nfreon, Float_t nquartz, | |
237c933d | 556 | Float_t emissPointLength, Float_t thetacer, |
74f08360 | 557 | Float_t phpad, Float_t pointsOnCathode[3], Float_t rectheta, Float_t recphi) |
e7257cad | 558 | { |
e7257cad | 559 | |
237c933d | 560 | // Find the distance to MIP impact |
561 | ||
562 | Float_t distanceValue; | |
563 | ||
564 | TVector3 radExitPhot(1,1,1);//photon impact at the radiator exit with respect | |
e7257cad | 565 | //to local reference sistem with the origin in the MIP entrance |
566 | ||
237c933d | 567 | TVector3 vectEmissPointLength(1,1,1); |
568 | Float_t magEmissPointLenght; | |
e7257cad | 569 | |
237c933d | 570 | TVector3 radExitPhot2(1,1,1);//photon impact at the radiator exit with respect |
571 | Float_t magRadExitPhot2; | |
e7257cad | 572 | //to a reference sistem with origin in the photon emission point and |
573 | //axes parallel to the MIP reference sistem | |
574 | ||
237c933d | 575 | TVector3 quarExitPhot(1,1,1);//photon impact at the quartz exit with respect |
576 | Float_t magQuarExitPhot; | |
e7257cad | 577 | // |
237c933d | 578 | TVector3 gapExitPhot(1,1,1) ; |
579 | Float_t magGapExitPhot; | |
e7257cad | 580 | // |
e0b63a71 | 581 | TVector3 PhotocatExitPhot(1,1,1); |
e7257cad | 582 | Double_t theta2; |
583 | Double_t thetarad , phirad ; | |
584 | Double_t thetaquar, phiquar; | |
585 | Double_t thetagap , phigap ; | |
586 | ||
587 | Float_t ngas = 1.; | |
588 | ||
74f08360 | 589 | magEmissPointLenght = emissPointLength/cos(rectheta); |
e7257cad | 590 | |
237c933d | 591 | vectEmissPointLength.SetMag(magEmissPointLenght); |
74f08360 | 592 | vectEmissPointLength.SetTheta(rectheta); |
593 | vectEmissPointLength.SetPhi(recphi); | |
e7257cad | 594 | |
595 | ||
237c933d | 596 | radExitPhot2.SetTheta(thetacer); |
597 | radExitPhot2.SetPhi(phpad); | |
e7257cad | 598 | |
599 | ||
600 | TRotation r1; | |
601 | TRotation r2; | |
602 | TRotation r; | |
603 | ||
74f08360 | 604 | r1. RotateY(rectheta); |
605 | r2. RotateZ(recphi); | |
e7257cad | 606 | |
607 | ||
608 | ||
609 | r = r2 * r1;//rotation about the y axis by MIP theta incidence angle | |
610 | //following by a rotation about the z axis by MIP phi incidence angle; | |
611 | ||
612 | ||
237c933d | 613 | radExitPhot2 = r * radExitPhot2; |
614 | theta2 = radExitPhot2.Theta(); | |
615 | magRadExitPhot2 = (fRw - vectEmissPointLength(2))/cos(theta2); | |
616 | radExitPhot2.SetMag(magRadExitPhot2); | |
e7257cad | 617 | |
618 | ||
237c933d | 619 | radExitPhot = vectEmissPointLength + radExitPhot2; |
620 | thetarad = radExitPhot.Theta(); | |
237c933d | 621 | phirad = radExitPhot.Phi(); //check on the original file // |
e7257cad | 622 | |
623 | thetaquar = SnellAngle( nfreon, nquartz, theta2); | |
237c933d | 624 | phiquar = radExitPhot2.Phi(); |
e7257cad | 625 | if(thetaquar == 999.) return thetaquar; |
237c933d | 626 | magQuarExitPhot = fQw/cos(thetaquar); |
627 | quarExitPhot.SetMag( magQuarExitPhot); | |
628 | quarExitPhot.SetTheta(thetaquar); | |
629 | quarExitPhot.SetPhi(phiquar); | |
e7257cad | 630 | |
631 | thetagap = SnellAngle( nquartz, ngas, thetaquar); | |
632 | phigap = phiquar; | |
633 | if(thetagap == 999.) return thetagap; | |
237c933d | 634 | magGapExitPhot = fTgap/cos(thetagap); |
635 | gapExitPhot.SetMag( magGapExitPhot); | |
636 | gapExitPhot.SetTheta(thetagap); | |
637 | gapExitPhot.SetPhi(phigap); | |
e7257cad | 638 | |
e0b63a71 | 639 | PhotocatExitPhot = radExitPhot + quarExitPhot + gapExitPhot; |
e7257cad | 640 | |
e0b63a71 | 641 | distanceValue = sqrt(TMath::Power(PhotocatExitPhot(0),2) |
642 | +TMath::Power(PhotocatExitPhot(1),2)); | |
643 | pointsOnCathode[0] = (Float_t) PhotocatExitPhot(0) + fXshift - fTrackLoc[0]; | |
644 | pointsOnCathode[1] = (Float_t) PhotocatExitPhot(1) + fYshift - fTrackLoc[1]; | |
645 | pointsOnCathode[2] = (Float_t) PhotocatExitPhot(2); | |
646 | ||
647 | //printf(" point in Distance.2. %f %f %f \n",pointsOnCathode[0],pointsOnCathode[1],pointsOnCathode[2]); | |
648 | ||
649 | return distanceValue; | |
650 | ||
651 | } | |
e7257cad | 652 | |
74f08360 | 653 | Float_t AliRICHPatRec::PhiPad(Float_t rectheta, Float_t recphi) |
e7257cad | 654 | { |
237c933d | 655 | |
656 | // ?? | |
657 | ||
e7257cad | 658 | Float_t zpad; |
659 | Float_t thetapad, phipad; | |
660 | Float_t thetarot, phirot; | |
661 | ||
662 | zpad = fRw + fQw + fTgap; | |
663 | ||
237c933d | 664 | TVector3 photonPad(fXpad, fYpad, zpad); |
665 | thetapad = photonPad.Theta(); | |
666 | phipad = photonPad.Phi(); | |
e7257cad | 667 | |
668 | TRotation r1; | |
669 | TRotation r2; | |
670 | TRotation r; | |
671 | ||
74f08360 | 672 | thetarot = - rectheta; |
673 | phirot = - recphi; | |
e7257cad | 674 | r1. RotateZ(phirot); |
675 | r2. RotateY(thetarot); | |
676 | ||
677 | r = r2 * r1;//rotation about the z axis by MIP -phi incidence angle | |
678 | //following by a rotation about the y axis by MIP -theta incidence angle; | |
679 | ||
237c933d | 680 | photonPad = r * photonPad; |
e7257cad | 681 | |
237c933d | 682 | phipad = photonPad.Phi(); |
e7257cad | 683 | |
684 | return phipad; | |
685 | } | |
686 | ||
687 | Float_t AliRICHPatRec:: SnellAngle(Float_t n1, Float_t n2, Float_t theta1) | |
688 | { | |
237c933d | 689 | |
690 | // Compute the Snell angle | |
691 | ||
e7257cad | 692 | Float_t sinrefractangle; |
693 | Float_t refractangle; | |
694 | ||
695 | sinrefractangle = (n1/n2)*sin(theta1); | |
696 | ||
697 | if(sinrefractangle>1.) { | |
698 | refractangle = 999.; | |
699 | return refractangle; | |
700 | } | |
701 | ||
702 | refractangle = asin(sinrefractangle); | |
703 | return refractangle; | |
704 | } | |
705 | ||
706 | Float_t AliRICHPatRec::CherenkovAngle(Float_t n, Float_t beta) | |
707 | { | |
237c933d | 708 | |
709 | // Compute the cerenkov angle | |
710 | ||
e7257cad | 711 | Float_t thetacer; |
712 | ||
713 | if((n*beta)<1.) { | |
714 | thetacer = 999.; | |
715 | return thetacer; | |
716 | } | |
717 | ||
718 | thetacer = acos (1./(n*beta)); | |
719 | return thetacer; | |
720 | } | |
721 | ||
722 | Float_t AliRICHPatRec::BetaCerenkov(Float_t n, Float_t theta) | |
723 | { | |
237c933d | 724 | |
725 | // Find beta | |
726 | ||
e7257cad | 727 | Float_t beta; |
728 | ||
729 | beta = 1./(n*cos(theta)); | |
730 | return beta; | |
731 | } | |
732 | ||
733 | ||
734 | ||
735 | ||
736 | void AliRICHPatRec::HoughResponse() | |
737 | ||
738 | { | |
237c933d | 739 | |
740 | // Implement Hough response pat. rec. method | |
741 | ||
e7257cad | 742 | int bin=0; |
743 | int bin1=0; | |
744 | int bin2=0; | |
237c933d | 745 | int i, j, k, nCorrBand; |
746 | int etaBin = 750; | |
747 | float hcs[750]; | |
748 | float angle, thetaCerMean; | |
e7257cad | 749 | |
237c933d | 750 | float etaPeak[30]; |
751 | float etaMin = 0.00; | |
752 | float etaMax = 0.75; | |
753 | float stepEta = 0.001; | |
754 | float windowEta = 0.040; | |
e7257cad | 755 | |
237c933d | 756 | int nBin; |
e7257cad | 757 | |
237c933d | 758 | float etaPeakPos = -1; |
759 | Int_t etaPeakCount = -1; | |
e7257cad | 760 | |
237c933d | 761 | thetaCerMean = 0.; |
e7257cad | 762 | fThetaCerenkov = 0.; |
763 | ||
237c933d | 764 | nBin = (int)(0.5+etaMax/(stepEta)); |
765 | nCorrBand = (int)(0.5+ windowEta/(2 * stepEta)); | |
766 | memset ((void *)hcs, 0, etaBin*sizeof(int)); | |
e7257cad | 767 | |
768 | for (k=0; k< fNumEtaPhotons; k++) { | |
769 | ||
770 | angle = fEtaPhotons[k]; | |
771 | ||
237c933d | 772 | if (angle>=etaMin && angle<= etaMax) { |
773 | bin = (int)(0.5+angle/(stepEta)); | |
774 | bin1= bin-nCorrBand; | |
775 | bin2= bin+nCorrBand; | |
e7257cad | 776 | if (bin1<0) bin1=0; |
237c933d | 777 | if (bin2>nBin) bin2=nBin; |
e7257cad | 778 | |
779 | for (j=bin1; j<bin2; j++) { | |
237c933d | 780 | hcs[j] += fWeightPhotons[k]; |
e7257cad | 781 | } |
782 | ||
237c933d | 783 | thetaCerMean += angle; |
e7257cad | 784 | } |
785 | } | |
786 | ||
237c933d | 787 | thetaCerMean /= fNumEtaPhotons; |
e7257cad | 788 | |
237c933d | 789 | HoughFiltering(hcs); |
790 | ||
791 | for (bin=0; bin <nBin; bin++) { | |
792 | angle = (bin+0.5) * (stepEta); | |
793 | if (hcs[bin] && hcs[bin] > etaPeakPos) { | |
794 | etaPeakCount = 0; | |
795 | etaPeakPos = hcs[bin]; | |
796 | etaPeak[0]=angle; | |
e7257cad | 797 | } |
798 | else { | |
237c933d | 799 | if (hcs[bin] == etaPeakPos) { |
800 | etaPeak[++etaPeakCount] = angle; | |
e7257cad | 801 | } |
802 | } | |
803 | } | |
804 | ||
237c933d | 805 | for (i=0; i<etaPeakCount+1; i++) { |
806 | fThetaCerenkov += etaPeak[i]; | |
e7257cad | 807 | } |
237c933d | 808 | if (etaPeakCount>=0) { |
809 | fThetaCerenkov /= etaPeakCount+1; | |
810 | fThetaPeakPos = etaPeakPos; | |
e7257cad | 811 | } |
812 | } | |
813 | ||
814 | ||
237c933d | 815 | void AliRICHPatRec::HoughFiltering(float hcs[]) |
e7257cad | 816 | { |
237c933d | 817 | |
818 | // hough filtering | |
819 | ||
820 | float hcsFilt[750]; | |
821 | float k[5] = {0.05, 0.25, 0.4, 0.25, 0.05}; | |
822 | int nx, i, nxDx; | |
e7257cad | 823 | int sizeHCS; |
237c933d | 824 | int nBin; |
e7257cad | 825 | |
237c933d | 826 | int etaBin = 750; |
827 | float etaMax = 0.75; | |
828 | float stepEta = 0.001; | |
e7257cad | 829 | |
237c933d | 830 | nBin = (int)(1+etaMax/stepEta); |
831 | sizeHCS = etaBin*sizeof(float); | |
e7257cad | 832 | |
237c933d | 833 | memset ((void *)hcsFilt, 0, sizeHCS); |
e7257cad | 834 | |
237c933d | 835 | for (nx = 0; nx < nBin; nx++) { |
e7257cad | 836 | for (i = 0; i < 5; i++) { |
237c933d | 837 | nxDx = nx + (i-2); |
838 | if (nxDx> -1 && nxDx<nBin) | |
839 | hcsFilt[nx] += hcs[nxDx] * k[i]; | |
e7257cad | 840 | } |
841 | } | |
842 | ||
237c933d | 843 | for (nx = 0; nx < nBin; nx++) { |
844 | hcs[nx] = hcsFilt[nx]; | |
e7257cad | 845 | } |
846 | } | |
847 | ||
e0b63a71 | 848 | /*void AliRICHPatRec::CerenkovRingDrawing() |
e7257cad | 849 | { |
850 | ||
851 | //to draw Cherenkov ring by known Cherenkov angle | |
852 | ||
e0b63a71 | 853 | Int_t nmaxdegrees; |
854 | Int_t Nphpad; | |
855 | Float_t phpad; | |
237c933d | 856 | Float_t nfreonave, nquartzave; |
857 | Float_t aveEnerg; | |
858 | Float_t energy[2]; | |
859 | Float_t e1, e2, f1, f2; | |
860 | Float_t bandradius; | |
e0b63a71 | 861 | |
e7257cad | 862 | //parameters to calculate freon window refractive index vs. energy |
e0b63a71 | 863 | |
237c933d | 864 | Float_t a = 1.177; |
865 | Float_t b = 0.0172; | |
866 | ||
e7257cad | 867 | //parameters to calculate quartz window refractive index vs. energy |
e0b63a71 | 868 | |
237c933d | 869 | energy[0] = 5.0; |
870 | energy[1] = 8.0; | |
871 | e1 = 10.666; | |
872 | e2 = 18.125; | |
873 | f1 = 46.411; | |
874 | f2 = 228.71; | |
875 | ||
e7257cad | 876 | |
e0b63a71 | 877 | nmaxdegrees = 36; |
237c933d | 878 | |
e0b63a71 | 879 | for (Nphpad=0; Nphpad<nmaxdegrees;Nphpad++) { |
880 | ||
881 | phpad = (360./(Float_t)nmaxdegrees)*(Float_t)Nphpad; | |
e7257cad | 882 | |
237c933d | 883 | aveEnerg = (energy[0]+energy[1])/2.; |
884 | ||
885 | nfreonave = a+b*aveEnerg; | |
00df6e79 | 886 | nquartzave = sqrt(1+(f1/(TMath::Power(e1,2)-TMath::Power(aveEnerg,2)))+ |
887 | (f2/(TMath::Power(e2,2)-TMath::Power(aveEnerg,2)))); | |
237c933d | 888 | |
237c933d | 889 | bandradius = DistanceFromMip(nfreonave, nquartzave, |
e0b63a71 | 890 | fEmissPoint,fThetaCerenkov, phpad); |
e7257cad | 891 | |
e0b63a71 | 892 | fCoordEllipse[0][Nphpad] = fOnCathode[0]; |
893 | fCoordEllipse[1][Nphpad] = fOnCathode[1]; | |
894 | printf(" values %f %f \n",fOnCathode[0],fOnCathode[1]); | |
237c933d | 895 | |
237c933d | 896 | } |
897 | ||
e0b63a71 | 898 | }*/ |
e7257cad | 899 | |
e7257cad | 900 |