]>
Commit | Line | Data |
---|---|---|
237c933d | 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 | $Log$ | |
b9d0a01d | 18 | Revision 1.9.6.1 2002/06/10 15:12:46 hristov |
19 | Merged with v3-08-02 | |
20 | ||
21 | Revision 1.9 2001/11/08 20:10:45 dibari | |
22 | ctor with initialising of parmeters added | |
23 | ||
ababa188 | 24 | Revision 1.8 2001/09/05 09:09:38 hristov |
25 | The energy of feedback photons calculated correctly | |
26 | ||
d9042b8a | 27 | Revision 1.7 2001/05/10 12:32:27 jbarbosa |
28 | Changed call to SetTrack. | |
29 | ||
3c5ffeb4 | 30 | Revision 1.6 2001/02/23 17:39:02 jbarbosa |
31 | Removed verbose output. | |
32 | ||
d65c4a20 | 33 | Revision 1.5 2001/02/23 17:25:08 jbarbosa |
34 | Re-definition of IntPH() to accomodate for wire sag effect. | |
35 | ||
733b4fa4 | 36 | Revision 1.4 2000/12/01 17:37:44 morsch |
37 | Replace in argument of SetTrack(..) string constant by kPFeedBackPhoton. | |
38 | ||
9e4670f0 | 39 | Revision 1.3 2000/10/03 21:44:09 morsch |
40 | Use AliSegmentation and AliHit abstract base classes. | |
41 | ||
a2f7eaf6 | 42 | Revision 1.2 2000/10/02 21:28:12 fca |
43 | Removal of useless dependecies via forward declarations | |
44 | ||
94de3818 | 45 | Revision 1.1 2000/06/12 15:29:37 jbarbosa |
46 | Cleaned up version. | |
47 | ||
237c933d | 48 | */ |
49 | ||
50 | #include "AliRICHResponseV0.h" | |
a2f7eaf6 | 51 | #include "AliSegmentation.h" |
237c933d | 52 | #include "AliRun.h" |
94de3818 | 53 | #include "AliMC.h" |
237c933d | 54 | |
55 | #include <TMath.h> | |
56 | #include <TRandom.h> | |
57 | #include <TParticle.h> | |
58 | //___________________________________________ | |
59 | ClassImp(AliRICHResponseV0) | |
60 | ||
ababa188 | 61 | AliRICHResponseV0::AliRICHResponseV0() |
62 | { | |
63 | SetSigmaIntegration(5.); | |
64 | SetChargeSlope(27.); | |
65 | SetChargeSpread(0.18, 0.18); | |
66 | SetMaxAdc(4096); | |
67 | SetAlphaFeedback(0.036); | |
68 | SetEIonisation(26.e-9); | |
69 | SetSqrtKx3(0.77459667); | |
70 | SetKx2(0.962); | |
71 | SetKx4(0.379); | |
72 | SetSqrtKy3(0.77459667); | |
73 | SetKy2(0.962); | |
74 | SetKy4(0.379); | |
75 | SetPitch(0.25); | |
76 | SetWireSag(1); // 1->On, 0->Off | |
77 | SetVoltage(2150); // Should only be 2000, 2050, 2100 or 2150 | |
78 | }//AliRICHResponseV0::ctor() | |
733b4fa4 | 79 | Float_t AliRICHResponseV0::IntPH(Float_t eloss, Float_t yhit) |
237c933d | 80 | { |
81 | // Get number of electrons and return charge | |
82 | ||
83 | Int_t nel; | |
84 | nel= Int_t(eloss/fEIonisation); | |
85 | ||
86 | Float_t charge=0; | |
733b4fa4 | 87 | Double_t gain_var=1; |
88 | ||
237c933d | 89 | if (nel == 0) nel=1; |
733b4fa4 | 90 | |
91 | if (fWireSag) | |
92 | { | |
93 | //printf("Voltage:%d, Yhit:%f\n",fVoltage, yhit); | |
94 | ||
95 | if (fVoltage==2150) | |
96 | { | |
97 | gain_var = 9e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0316*TMath::Power(yhit,2) - 3e-4*yhit + 25.367; | |
98 | //gain_var = 9e-5*TMath::Power(yhit,4) + 2e-6*TMath::Power(yhit,3) - 0.316*TMath::Power(yhit,2) - 3e-3*yhit + 253.67; | |
99 | } | |
100 | if (fVoltage==2100) | |
101 | gain_var = 8e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0283*TMath::Power(yhit,2) - 2e-4*yhit + 23.015; | |
102 | if (fVoltage==2050) | |
103 | gain_var = 7e-6*TMath::Power(yhit,4) + 1e-7*TMath::Power(yhit,3) - 0.0254*TMath::Power(yhit,2) - 2e-4*yhit + 20.888; | |
104 | if (fVoltage==2000) | |
105 | gain_var = 6e-6*TMath::Power(yhit,4) + 8e-8*TMath::Power(yhit,3) - 0.0227*TMath::Power(yhit,2) - 1e-4*yhit + 18.961; | |
106 | ||
107 | gain_var = gain_var/100; | |
108 | //printf("Yhit:%f, Gain variation:%f\n",yhit,gain_var); | |
109 | ||
110 | Float_t gain = (fChargeSlope + fChargeSlope*gain_var)*.9; | |
d65c4a20 | 111 | //printf(" Yhit:%f, Gain variation:%f\n",yhit, gain); |
733b4fa4 | 112 | |
113 | for (Int_t i=1;i<=nel;i++) { | |
114 | charge -= gain*TMath::Log(gRandom->Rndm()); | |
115 | } | |
116 | } | |
117 | else | |
118 | { | |
119 | for (Int_t i=1;i<=nel;i++) { | |
120 | charge -= fChargeSlope*TMath::Log(gRandom->Rndm()); | |
121 | } | |
122 | } | |
123 | ||
237c933d | 124 | return charge; |
125 | } | |
126 | ||
733b4fa4 | 127 | Float_t AliRICHResponseV0::IntPH(Float_t yhit) |
237c933d | 128 | { |
129 | ||
130 | // Get number of electrons and return charge, for a single photon | |
131 | ||
733b4fa4 | 132 | Float_t charge=0; |
133 | Double_t gain_var=1; | |
134 | ||
135 | if (fWireSag) | |
136 | { | |
137 | if (fVoltage==2150) | |
138 | { | |
139 | gain_var = 9e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0316*TMath::Power(yhit,2) - 3e-4*yhit + 25.367; | |
140 | //gain_var = 9e-5*TMath::Power(yhit,4) + 2e-6*TMath::Power(yhit,3) - 0.316*TMath::Power(yhit,2) - 3e-3*yhit + 253.67; | |
141 | } | |
142 | if (fVoltage==2100) | |
143 | gain_var = 8e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0283*TMath::Power(yhit,2) - 2e-4*yhit + 23.015; | |
144 | if (fVoltage==2050) | |
145 | gain_var = 7e-6*TMath::Power(yhit,4) + 1e-7*TMath::Power(yhit,3) - 0.0254*TMath::Power(yhit,2) - 2e-4*yhit + 20.888; | |
146 | if (fVoltage==2000) | |
147 | gain_var = 6e-6*TMath::Power(yhit,4) + 8e-8*TMath::Power(yhit,3) - 0.0227*TMath::Power(yhit,2) - 1e-4*yhit + 18.961; | |
148 | ||
149 | gain_var = gain_var/100; | |
150 | //printf(" Yhit:%f, Gain variation:%f\n",yhit, gain_var); | |
151 | ||
152 | Float_t gain = (fChargeSlope + fChargeSlope*gain_var)*.9; | |
153 | ||
154 | charge -= gain*TMath::Log(gRandom->Rndm()); | |
d65c4a20 | 155 | //printf(" Yhit:%f, Gain variation:%f\n",yhit, gain); |
733b4fa4 | 156 | } |
157 | else | |
158 | { | |
159 | charge -= fChargeSlope*TMath::Log(gRandom->Rndm()); | |
160 | } | |
237c933d | 161 | return charge; |
162 | } | |
163 | ||
164 | ||
165 | ||
166 | // ------------------------------------------- | |
a2f7eaf6 | 167 | Float_t AliRICHResponseV0::IntXY(AliSegmentation * segmentation) |
237c933d | 168 | { |
169 | ||
170 | const Float_t kInversePitch = 1/fPitch; | |
171 | Float_t response; | |
172 | // | |
173 | // Integration limits defined by segmentation model | |
174 | // | |
175 | ||
176 | Float_t xi1, xi2, yi1, yi2; | |
177 | segmentation->IntegrationLimits(xi1,xi2,yi1,yi2); | |
178 | ||
179 | xi1=xi1*kInversePitch; | |
180 | xi2=xi2*kInversePitch; | |
181 | yi1=yi1*kInversePitch; | |
182 | yi2=yi2*kInversePitch; | |
183 | ||
184 | //printf("Integration Limits: %f-%f, %f-%f\n",xi1,xi2,yi1,yi2); | |
185 | ||
186 | //printf("KInversePitch:%f\n",kInversePitch); | |
187 | ||
188 | // | |
189 | // The Mathieson function | |
190 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
191 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
192 | ||
193 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
194 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
195 | ||
196 | //printf("Integration Data: %f-%f, %f-%f\n",ux1,ux2,uy1,uy2); | |
197 | ||
198 | //printf("%f %f %f %f\n",fSqrtKx3,fKx2,fKy4,fKx4); | |
199 | ||
200 | response=4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)); | |
201 | ||
202 | //printf("Response:%f\n",response); | |
203 | ||
204 | return response; | |
205 | ||
206 | } | |
207 | ||
208 | Int_t AliRICHResponseV0::FeedBackPhotons(Float_t *source, Float_t qtot) | |
209 | { | |
210 | // | |
211 | // Generate FeedBack photons | |
212 | // | |
213 | Int_t j, ipart, nt; | |
214 | ||
215 | Int_t sNfeed=0; | |
216 | ||
217 | ||
218 | // Local variables | |
b9d0a01d | 219 | Double_t ranf[2]; |
220 | Float_t cthf, phif, enfp = 0, sthf; | |
237c933d | 221 | Int_t i, ifeed; |
222 | Float_t e1[3], e2[3], e3[3]; | |
223 | Float_t vmod, uswop; | |
b9d0a01d | 224 | Float_t fp; |
225 | Double_t random; | |
237c933d | 226 | Float_t dir[3], phi; |
227 | Int_t nfp; | |
d9042b8a | 228 | Float_t pol[3], mom[4]; |
237c933d | 229 | TLorentzVector position; |
230 | // | |
231 | // Determine number of feedback photons | |
232 | ||
233 | // Get weight of current particle | |
234 | TParticle *current = (TParticle*) | |
235 | (*gAlice->Particles())[gAlice->CurrentTrack()]; | |
236 | ||
237 | ifeed = Int_t(current->GetWeight()/100+0.5); | |
238 | ipart = gMC->TrackPid(); | |
239 | fp = fAlphaFeedback * qtot; | |
240 | nfp = gRandom->Poisson(fp); | |
241 | ||
242 | // This call to fill the time of flight | |
243 | gMC->TrackPosition(position); | |
3c5ffeb4 | 244 | //printf("Track position: %f %f %f %15.12f\n", position[0],position[1],position[2],position[3]); |
237c933d | 245 | // |
246 | // Generate photons | |
247 | for (i = 0; i <nfp; i++) { | |
248 | ||
249 | // Direction | |
b9d0a01d | 250 | gMC->GetRandom()->RndmArray(2,ranf); |
237c933d | 251 | cthf = ranf[0] * 2 - 1.; |
252 | if (cthf < 0) continue; | |
253 | sthf = TMath::Sqrt((1 - cthf) * (1 + cthf)); | |
254 | phif = ranf[1] * 2 * TMath::Pi(); | |
255 | // | |
b9d0a01d | 256 | //gMC->Rndm(&random, 1); |
257 | gMC->GetRandom()->RndmArray(1, &random); | |
237c933d | 258 | if (random <= .57) { |
259 | enfp = 7.5e-9; | |
260 | } else if (random <= .7) { | |
261 | enfp = 6.4e-9; | |
262 | } else { | |
263 | enfp = 7.9e-9; | |
264 | } | |
265 | ||
266 | dir[0] = sthf * TMath::Sin(phif); | |
267 | dir[1] = cthf; | |
268 | dir[2] = sthf * TMath::Cos(phif); | |
269 | gMC->Gdtom(dir, mom, 2); | |
270 | mom[0]*=enfp; | |
271 | mom[1]*=enfp; | |
272 | mom[2]*=enfp; | |
d9042b8a | 273 | mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]); |
3c5ffeb4 | 274 | //printf("Dir %f %f %f\n",dir[0],dir[1],dir[2]); |
275 | //printf("Momentum %15.12f %15.12f %15.12f\n",mom[0],mom[1],mom[2]); | |
d9042b8a | 276 | //printf("Energy %e\n", mom[3]); |
237c933d | 277 | |
278 | // Polarisation | |
279 | e1[0] = 0; | |
280 | e1[1] = -dir[2]; | |
281 | e1[2] = dir[1]; | |
282 | ||
283 | e2[0] = -dir[1]; | |
284 | e2[1] = dir[0]; | |
285 | e2[2] = 0; | |
286 | ||
287 | e3[0] = dir[1]; | |
288 | e3[1] = 0; | |
289 | e3[2] = -dir[0]; | |
290 | ||
291 | vmod=0; | |
292 | for(j=0;j<3;j++) vmod+=e1[j]*e1[j]; | |
293 | if (!vmod) for(j=0;j<3;j++) { | |
294 | uswop=e1[j]; | |
295 | e1[j]=e3[j]; | |
296 | e3[j]=uswop; | |
297 | } | |
298 | vmod=0; | |
299 | for(j=0;j<3;j++) vmod+=e2[j]*e2[j]; | |
300 | if (!vmod) for(j=0;j<3;j++) { | |
301 | uswop=e2[j]; | |
302 | e2[j]=e3[j]; | |
303 | e3[j]=uswop; | |
304 | } | |
305 | ||
306 | vmod=0; | |
307 | for(j=0;j<3;j++) vmod+=e1[j]*e1[j]; | |
308 | vmod=TMath::Sqrt(1/vmod); | |
309 | for(j=0;j<3;j++) e1[j]*=vmod; | |
310 | ||
311 | vmod=0; | |
312 | for(j=0;j<3;j++) vmod+=e2[j]*e2[j]; | |
313 | vmod=TMath::Sqrt(1/vmod); | |
314 | for(j=0;j<3;j++) e2[j]*=vmod; | |
315 | ||
b9d0a01d | 316 | //gMC->Rndm(ranf, 1); |
317 | gMC->GetRandom()->RndmArray(1,ranf); | |
237c933d | 318 | phi = ranf[0] * 2 * TMath::Pi(); |
319 | for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi); | |
320 | gMC->Gdtom(pol, pol, 2); | |
321 | ||
322 | // Put photon on the stack and label it as feedback (51, 52) | |
323 | ++sNfeed; | |
324 | ||
325 | gAlice->SetTrack(Int_t(1), gAlice->CurrentTrack(), Int_t(50000051), | |
3c5ffeb4 | 326 | mom[0],mom[1],mom[2],mom[3],source[0],source[1],source[2],position[3],pol[0],pol[1],pol[2], |
9e4670f0 | 327 | kPFeedBackPhoton, nt, 1.); |
3c5ffeb4 | 328 | |
329 | //printf("Adding feedback with tof %f and going to %f %f %f\n",position[3],mom[0],mom[1],mom[2]); | |
237c933d | 330 | } |
3c5ffeb4 | 331 | //if(sNfeed) |
332 | //printf("feedbacks produced:%d\n",sNfeed); | |
237c933d | 333 | return(sNfeed); |
334 | } | |
335 | ||
336 | ||
337 | ||
338 |