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4c039060 | 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 | /* | |
87a6e868 | 17 | $Log$ |
4c039060 | 18 | */ |
19 | ||
87a6e868 | 20 | |
ddae0931 | 21 | #include "AliRICHSegResV0.h" |
22 | #include "AliRun.h" | |
23 | #include "TParticle.h" | |
24 | #include "TMath.h" | |
25 | #include "TRandom.h" | |
87a6e868 | 26 | #include "TArc.h" |
ddae0931 | 27 | |
28 | ||
87a6e868 | 29 | ClassImp(AliRICHSegmentation) |
30 | ClassImp(AliRICHResponse) | |
31 | ClassImp(AliRICHGeometry) | |
ddae0931 | 32 | //___________________________________________ |
87a6e868 | 33 | ClassImp(AliRICHSegmentationV0) |
ddae0931 | 34 | |
87a6e868 | 35 | void AliRICHSegmentationV0::Init(AliRICHChamber* Chamber) |
ddae0931 | 36 | { |
87a6e868 | 37 | //fNpx=(Int_t) (Chamber->ROuter()/fDpx+1); |
38 | //fNpy=(Int_t) (Chamber->ROuter()/fDpy+1); | |
39 | fNpx=160; | |
40 | fNpy=144; | |
41 | //fNpx=80; | |
42 | //fNpy=48; | |
43 | fSector=-1; | |
ddae0931 | 44 | } |
45 | ||
46 | ||
87a6e868 | 47 | Float_t AliRICHSegmentationV0::GetAnod(Float_t xhit) |
ddae0931 | 48 | { |
49 | Float_t wire= (xhit>0)? Int_t(xhit/fWireD)+0.5:Int_t(xhit/fWireD)-0.5; | |
50 | return fWireD*wire; | |
51 | } | |
52 | ||
87a6e868 | 53 | void AliRICHSegmentationV0::SetPadSize(Float_t p1, Float_t p2) |
ddae0931 | 54 | { |
55 | fDpx=p1; | |
56 | fDpy=p2; | |
57 | } | |
87a6e868 | 58 | void AliRICHSegmentationV0::GetPadIxy(Float_t x, Float_t y, Int_t &ix, Int_t &iy) |
ddae0931 | 59 | { |
60 | // returns pad coordinates (ix,iy) for given real coordinates (x,y) | |
61 | // | |
87a6e868 | 62 | // Please check origin of pad numbering !!! |
63 | ||
64 | ||
65 | ix = (x>0)? Int_t(x/fDpx)+1 : Int_t(x/fDpx); | |
66 | iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy); | |
67 | if (iy > fNpy) iy= fNpy; | |
68 | if (iy < -fNpy) iy=-fNpy; | |
69 | if (ix > fNpx) ix= fNpx; | |
70 | if (ix < -fNpx) ix=-fNpx; | |
ddae0931 | 71 | } |
87a6e868 | 72 | void AliRICHSegmentationV0:: |
ddae0931 | 73 | GetPadCxy(Int_t ix, Int_t iy, Float_t &x, Float_t &y) |
74 | { | |
75 | // returns real coordinates (x,y) for given pad coordinates (ix,iy) | |
76 | // | |
87a6e868 | 77 | |
78 | x = (ix>0) ? Float_t(ix*fDpx)-fDpx/2. : Float_t(ix*fDpx)-fDpx/2.; | |
79 | y = (iy>0) ? Float_t(iy*fDpy)-fDpy/2. : Float_t(iy*fDpy)-fDpy/2.; | |
80 | } | |
81 | ||
82 | void AliRICHSegmentationV0:: | |
83 | SetHit(Float_t xhit, Float_t yhit) | |
84 | { | |
85 | // | |
86 | // Find the wire position (center of charge distribution) | |
87 | // Float_t x0a=GetAnod(xhit); | |
88 | fxhit=xhit; | |
89 | fyhit=yhit; | |
90 | } | |
91 | ||
92 | void AliRICHSegmentationV0:: | |
93 | SetPad(Int_t ix, Int_t iy) | |
94 | { | |
95 | GetPadCxy(ix,iy,fx,fy); | |
ddae0931 | 96 | } |
97 | ||
87a6e868 | 98 | |
99 | ||
100 | void AliRICHSegmentationV0:: | |
ddae0931 | 101 | FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy) |
102 | { | |
87a6e868 | 103 | |
ddae0931 | 104 | // |
105 | // Find the wire position (center of charge distribution) | |
106 | Float_t x0a=GetAnod(xhit); | |
87a6e868 | 107 | fxhit=x0a; |
108 | fyhit=yhit; | |
ddae0931 | 109 | // |
110 | // and take fNsigma*sigma around this center | |
111 | Float_t x01=x0a - dx; | |
112 | Float_t x02=x0a + dx; | |
113 | Float_t y01=yhit - dy; | |
114 | Float_t y02=yhit + dy; | |
115 | // | |
116 | // find the pads over which the charge distributes | |
117 | GetPadIxy(x01,y01,fixmin,fiymin); | |
118 | GetPadIxy(x02,y02,fixmax,fiymax); | |
119 | // | |
120 | // Set current pad to lower left corner | |
121 | fix=fixmin; | |
122 | fiy=fiymin; | |
123 | GetPadCxy(fix,fiy,fx,fy); | |
87a6e868 | 124 | |
125 | //if (fSector==2) | |
126 | //printf("fix: %d, fiy: %d fx: %f, fy: %f\n",fix,fiy,fx,fy); | |
ddae0931 | 127 | } |
128 | ||
87a6e868 | 129 | void AliRICHSegmentationV0::NextPad() |
ddae0931 | 130 | { |
87a6e868 | 131 | //printf("\n Next Pad \n"); |
132 | ||
ddae0931 | 133 | // |
134 | // Step to next pad in integration region | |
87a6e868 | 135 | if (fix <= fixmax) { |
136 | // if (fix==-1) fix++; | |
ddae0931 | 137 | fix++; |
87a6e868 | 138 | } else if (fiy <= fiymax) { |
139 | // if (fiy==-1) fiy++; | |
ddae0931 | 140 | fix=fixmin; |
141 | fiy++; | |
142 | } else { | |
143 | printf("\n Error: Stepping outside integration region\n "); | |
144 | } | |
145 | GetPadCxy(fix,fiy,fx,fy); | |
146 | } | |
147 | ||
87a6e868 | 148 | Int_t AliRICHSegmentationV0::MorePads() |
149 | ||
ddae0931 | 150 | // |
151 | // Are there more pads in the integration region | |
152 | { | |
87a6e868 | 153 | //printf("\n More Pads ? \n"); |
154 | ||
155 | ||
156 | if (fix >= fixmax && fiy >= fiymax) { | |
157 | //printf("There are no more pads\n\n\n\n\n"); | |
158 | return 0; | |
159 | } else { | |
160 | //printf("There are more pads\n\n"); | |
161 | return 1; | |
162 | } | |
ddae0931 | 163 | } |
164 | ||
87a6e868 | 165 | void AliRICHSegmentationV0::SigGenInit(Float_t x,Float_t y,Float_t) |
ddae0931 | 166 | { |
167 | // | |
168 | // Initialises pad and wire position during stepping | |
169 | fxt =x; | |
170 | fyt =y; | |
171 | GetPadIxy(x,y,fixt,fiyt); | |
87a6e868 | 172 | fiwt= (x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1 ; |
ddae0931 | 173 | } |
174 | ||
87a6e868 | 175 | Int_t AliRICHSegmentationV0::SigGenCond(Float_t x,Float_t y,Float_t) |
ddae0931 | 176 | { |
177 | // | |
178 | // Signal will be generated if particle crosses pad boundary or | |
179 | // boundary between two wires. | |
180 | Int_t ixt, iyt; | |
181 | GetPadIxy(x,y,ixt,iyt); | |
87a6e868 | 182 | Int_t iwt=(x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1; |
ddae0931 | 183 | |
184 | if ((ixt != fixt) || (iyt !=fiyt) || (iwt != fiwt)) { | |
87a6e868 | 185 | return 1; |
ddae0931 | 186 | } else { |
87a6e868 | 187 | return 0; |
ddae0931 | 188 | } |
189 | } | |
87a6e868 | 190 | void AliRICHSegmentationV0:: |
ddae0931 | 191 | IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2) |
192 | { | |
87a6e868 | 193 | /* |
194 | x1=fxt-fx-fDpx/2.; | |
195 | x2=x1+fDpx; | |
196 | y1=fyt-fy-fDpy/2.; | |
197 | y2=y1+fDpy; | |
198 | */ | |
199 | x1=fxhit-fx-fDpx/2.; | |
200 | x2=x1+fDpx; | |
201 | y1=fyhit-fy-fDpy/2.; | |
202 | y2=y1+fDpy; | |
ddae0931 | 203 | } |
204 | ||
87a6e868 | 205 | void AliRICHSegmentationV0:: |
ddae0931 | 206 | Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[7], Int_t Ylist[7]) |
207 | { | |
208 | //Is used for the cluster finder, include diagonal elements | |
209 | ||
210 | *Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1; | |
211 | Ylist[0]=iY-1;Ylist[1]=iY+1;Ylist[2]=Ylist[3]=iY; | |
87a6e868 | 212 | /* |
213 | *Nlist=8; | |
214 | Xlist[0]=Xlist[1]=iX; | |
215 | Xlist[2]=iX-1; | |
216 | Xlist[3]=iX+1; | |
217 | Ylist[0]=iY-1; | |
218 | Ylist[1]=iY+1; | |
219 | Ylist[2]=Ylist[3]=iY; | |
220 | ||
221 | // Diagonal elements | |
222 | Xlist[4]=iX+1; | |
223 | Ylist[4]=iY+1; | |
224 | ||
225 | Xlist[5]=iX-1; | |
226 | Ylist[5]=iY-1; | |
227 | ||
228 | Xlist[6]=iX-1; | |
229 | Ylist[6]=iY+1; | |
230 | ||
231 | Xlist[7]=iX+1; | |
232 | Ylist[7]=iY-1; | |
233 | */ | |
ddae0931 | 234 | } |
235 | ||
87a6e868 | 236 | Float_t AliRICHSegmentationV0::Distance2AndOffset(Int_t iX, Int_t iY, Float_t X, Float_t Y |
237 | , Int_t *dummy) | |
238 | // Returns the square of the distance between 1 pad | |
239 | // labelled by its Channel numbers and a coordinate | |
ddae0931 | 240 | { |
87a6e868 | 241 | Float_t x,y; |
242 | GetPadCxy(iX,iY,x,y); | |
243 | return (x-X)*(x-X) + (y-Y)*(y-Y); | |
244 | } | |
245 | ||
246 | ||
247 | void AliRICHSegmentationV0::GiveTestPoints(Int_t &n, Float_t *x, Float_t *y) | |
248 | { | |
249 | n=1; | |
250 | x[0]=0.; | |
251 | y[0]=x[0]; | |
252 | } | |
253 | ||
254 | void AliRICHSegmentationV0::Draw() | |
255 | { | |
256 | /* | |
257 | TArc *circle; | |
258 | Float_t scale=0.95/fRmax/2.; | |
259 | ||
260 | ||
261 | circle = new TArc(0.5,0.5,fRmax*scale,0.,360.); | |
262 | circle->SetFillColor(2); | |
263 | circle->Draw(); | |
264 | ||
265 | circle = new TArc(0.5,0.5,fRmin*scale,0.,360.); | |
266 | circle->SetFillColor(1); | |
267 | circle->Draw(); | |
268 | */ | |
ddae0931 | 269 | ; |
87a6e868 | 270 | |
ddae0931 | 271 | } |
272 | ||
273 | ||
274 | //___________________________________________ | |
87a6e868 | 275 | ClassImp(AliRICHResponseV0) |
276 | ||
277 | Float_t AliRICHResponseV0::IntPH(Float_t eloss) | |
ddae0931 | 278 | { |
279 | // Get number of electrons and return charge | |
280 | ||
281 | Int_t nel; | |
87a6e868 | 282 | nel= Int_t(eloss/fEIonisation); |
283 | ||
ddae0931 | 284 | Float_t charge=0; |
285 | if (nel == 0) nel=1; | |
286 | for (Int_t i=1;i<=nel;i++) { | |
87a6e868 | 287 | charge -= fChargeSlope*TMath::Log(gRandom->Rndm()); |
ddae0931 | 288 | } |
289 | return charge; | |
290 | } | |
87a6e868 | 291 | |
292 | Float_t AliRICHResponseV0::IntPH() | |
293 | { | |
294 | Float_t charge = -fChargeSlope*TMath::Log(gRandom->Rndm()); | |
295 | return charge; | |
296 | } | |
297 | ||
298 | ||
299 | ||
ddae0931 | 300 | // ------------------------------------------- |
87a6e868 | 301 | Float_t AliRICHResponseV0::IntXY(AliRICHSegmentation * segmentation) |
ddae0931 | 302 | { |
303 | ||
304 | const Float_t invpitch = 1/fPitch; | |
305 | Float_t response; | |
306 | // | |
307 | // Integration limits defined by segmentation model | |
308 | // | |
309 | ||
310 | Float_t xi1, xi2, yi1, yi2; | |
311 | segmentation->IntegrationLimits(xi1,xi2,yi1,yi2); | |
87a6e868 | 312 | |
ddae0931 | 313 | xi1=xi1*invpitch; |
314 | xi2=xi2*invpitch; | |
315 | yi1=yi1*invpitch; | |
316 | yi2=yi2*invpitch; | |
87a6e868 | 317 | |
318 | //printf("Integration Limits: %f-%f, %f-%f\n",xi1,xi2,yi1,yi2); | |
ddae0931 | 319 | |
87a6e868 | 320 | //printf("Invpitch:%f\n",invpitch); |
321 | ||
ddae0931 | 322 | // |
323 | // The Mathieson function | |
324 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
325 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
326 | ||
327 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
328 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
87a6e868 | 329 | |
330 | //printf("Integration Data: %f-%f, %f-%f\n",ux1,ux2,uy1,uy2); | |
331 | ||
332 | //printf("%f %f %f %f\n",fSqrtKx3,fKx2,fKy4,fKx4); | |
ddae0931 | 333 | |
334 | response=4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)); | |
335 | ||
87a6e868 | 336 | //printf("Response:%f\n",response); |
337 | ||
ddae0931 | 338 | return response; |
339 | ||
340 | } | |
87a6e868 | 341 | |
342 | Int_t AliRICHResponseV0::FeedBackPhotons(Float_t *source, Float_t qtot) | |
ddae0931 | 343 | { |
344 | // | |
345 | // Generate FeedBack photons | |
346 | // | |
347 | Int_t j, ipart, nt; | |
348 | ||
ddae0931 | 349 | Int_t sNfeed=0; |
350 | ||
87a6e868 | 351 | |
ddae0931 | 352 | // Local variables |
87a6e868 | 353 | Float_t cthf, ranf[2], phif, enfp = 0, sthf; |
ddae0931 | 354 | Int_t i, ifeed; |
355 | Float_t e1[3], e2[3], e3[3]; | |
356 | Float_t vmod, uswop; | |
357 | Float_t fp, random; | |
358 | Float_t dir[3], phi; | |
359 | Int_t nfp; | |
360 | Float_t pol[3], mom[3]; | |
361 | TLorentzVector position; | |
362 | // | |
363 | // Determine number of feedback photons | |
364 | ||
365 | // Get weight of current particle | |
366 | TParticle *current = (TParticle*) | |
367 | (*gAlice->Particles())[gAlice->CurrentTrack()]; | |
368 | ||
369 | ifeed = Int_t(current->GetWeight()/100+0.5); | |
370 | ipart = gMC->TrackPid(); | |
87a6e868 | 371 | fp = fAlphaFeedback * qtot; |
ddae0931 | 372 | nfp = gRandom->Poisson(fp); |
373 | ||
374 | // This call to fill the time of flight | |
375 | gMC->TrackPosition(position); | |
376 | // | |
377 | // Generate photons | |
87a6e868 | 378 | for (i = 0; i <nfp; i++) { |
ddae0931 | 379 | |
380 | // Direction | |
381 | gMC->Rndm(ranf, 2); | |
382 | cthf = ranf[0] * 2 - 1.; | |
383 | if (cthf < 0) continue; | |
384 | sthf = TMath::Sqrt((1 - cthf) * (1 + cthf)); | |
385 | phif = ranf[1] * 2 * TMath::Pi(); | |
386 | // | |
387 | gMC->Rndm(&random, 1); | |
388 | if (random <= .57) { | |
389 | enfp = 7.5e-9; | |
390 | } else if (random <= .7) { | |
391 | enfp = 6.4e-9; | |
392 | } else { | |
393 | enfp = 7.9e-9; | |
394 | } | |
395 | ||
396 | dir[0] = sthf * TMath::Sin(phif); | |
397 | dir[1] = cthf; | |
398 | dir[2] = sthf * TMath::Cos(phif); | |
399 | gMC->Gdtom(dir, mom, 2); | |
400 | mom[0]*=enfp; | |
401 | mom[1]*=enfp; | |
402 | mom[2]*=enfp; | |
403 | ||
404 | // Polarisation | |
405 | e1[0] = 0; | |
406 | e1[1] = -dir[2]; | |
407 | e1[2] = dir[1]; | |
408 | ||
409 | e2[0] = -dir[1]; | |
410 | e2[1] = dir[0]; | |
411 | e2[2] = 0; | |
412 | ||
413 | e3[0] = dir[1]; | |
414 | e3[1] = 0; | |
415 | e3[2] = -dir[0]; | |
416 | ||
417 | vmod=0; | |
418 | for(j=0;j<3;j++) vmod+=e1[j]*e1[j]; | |
419 | if (!vmod) for(j=0;j<3;j++) { | |
420 | uswop=e1[j]; | |
421 | e1[j]=e3[j]; | |
422 | e3[j]=uswop; | |
423 | } | |
424 | vmod=0; | |
425 | for(j=0;j<3;j++) vmod+=e2[j]*e2[j]; | |
426 | if (!vmod) for(j=0;j<3;j++) { | |
427 | uswop=e2[j]; | |
428 | e2[j]=e3[j]; | |
429 | e3[j]=uswop; | |
430 | } | |
431 | ||
432 | vmod=0; | |
433 | for(j=0;j<3;j++) vmod+=e1[j]*e1[j]; | |
434 | vmod=TMath::Sqrt(1/vmod); | |
435 | for(j=0;j<3;j++) e1[j]*=vmod; | |
436 | ||
437 | vmod=0; | |
438 | for(j=0;j<3;j++) vmod+=e2[j]*e2[j]; | |
439 | vmod=TMath::Sqrt(1/vmod); | |
440 | for(j=0;j<3;j++) e2[j]*=vmod; | |
441 | ||
442 | gMC->Rndm(ranf, 1); | |
443 | phi = ranf[0] * 2 * TMath::Pi(); | |
444 | for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi); | |
445 | gMC->Gdtom(pol, pol, 2); | |
446 | ||
447 | // Put photon on the stack and label it as feedback (51, 52) | |
448 | ++sNfeed; | |
87a6e868 | 449 | |
450 | gAlice->SetTrack(Int_t(1), gAlice->CurrentTrack(), Int_t(50000051), | |
ddae0931 | 451 | mom,source,pol,position[3], |
87a6e868 | 452 | "Feedback", nt, 1.); |
ddae0931 | 453 | } |
f91473f6 | 454 | return(sNfeed); |
ddae0931 | 455 | } |
87a6e868 | 456 | |
457 | //___________________________________________ | |
458 | ClassImp(AliRICHGeometryV0) |