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b0f5e3fc | 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 | $Log$ | |
b0f5e3fc | 18 | */ |
e8189707 | 19 | #include <TRandom.h> |
b0f5e3fc | 20 | |
b0f5e3fc | 21 | #include "AliITS.h" |
517784f0 | 22 | #include "AliITShit.h" |
23 | #include "AliITSRecPoint.h" | |
24 | #include "AliITSmodule.h" | |
25 | #include "AliITSgeom.h" | |
e8189707 | 26 | #include "AliRun.h" |
b0f5e3fc | 27 | #include "AliITSsimulationFastPoints.h" |
e8189707 | 28 | |
b0f5e3fc | 29 | |
30 | ClassImp(AliITSsimulationFastPoints) | |
31 | ||
32 | AliITSsimulationFastPoints::AliITSsimulationFastPoints() | |
33 | { | |
34 | //constructor | |
e8189707 | 35 | fSigmaRPhi[0] = fSigmaRPhi[1] = 12e-4; |
36 | fSigmaRPhi[2] = fSigmaRPhi[3] = 38e-4; | |
37 | fSigmaRPhi[4] = fSigmaRPhi[5] = 20e-4; | |
38 | fSigmaZ[0] = fSigmaZ[1] = 70e-4; | |
39 | fSigmaZ[2] = fSigmaZ[3] = 28e-4; | |
40 | fSigmaZ[4] = fSigmaZ[5] = 830e-4; | |
41 | fSigmaDe[0] = fSigmaDe[1] = 0.72e-6; | |
42 | fSigmaDe[2] = fSigmaDe[3] = 0.90e-6; | |
43 | fSigmaDe[4] = fSigmaDe[5] = 5e-6; | |
44 | fThrDe[0] = fThrDe[1] = 7.2e-6; | |
45 | fThrDe[2] = fThrDe[3] = 2.70e-6; | |
46 | fThrDe[4] = fThrDe[5] = 10e-6; | |
b0f5e3fc | 47 | } |
48 | ||
e8189707 | 49 | //------------------------------------------------------------- |
50 | void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule *mod, Int_t module, TRandom *random){ | |
51 | // Fast points simulator | |
52 | ||
53 | AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
54 | AliITSgeom *gm = aliITS->GetITSgeom(); | |
55 | ||
56 | const Float_t kdEdXtoQ = 2.778e+8; | |
57 | ||
58 | Int_t ihit,flag,numofhits; | |
59 | Float_t xg,yg,zg,xl,yl,zl; | |
60 | Float_t px,py,pz; | |
61 | //Double_t p, theta, pt, ps; | |
62 | Float_t locals[3]; | |
63 | Float_t globals[3]; | |
64 | //Float_t xg1,yg1,zg1; | |
65 | Double_t sigmarphi=0., sigmaz=0., sigmade=0., thrde=0.; | |
66 | Float_t deltaXl,deltaZl,deltaDe; | |
67 | ||
68 | Int_t hitlay, hitlad, hitdet, hitstatus, hittrack; | |
69 | Float_t hitx, hity, hitz, hitpx, hitpy, hitpz, hitdestep; | |
70 | ||
71 | ||
72 | Int_t hitstatus1, hittrack1; | |
73 | Float_t hitx1, hity1, hitz1; | |
74 | Float_t hitdestep1; | |
75 | ||
76 | Float_t xMg,yMg,zMg; | |
77 | //Float_t dx,dy,dz,ds; | |
78 | ||
79 | ||
80 | numofhits = mod->GetNhits(); | |
517784f0 | 81 | printf("numofhits %d \n",numofhits); |
e8189707 | 82 | flag = 1; |
83 | for(ihit=0;ihit<numofhits;ihit++){ | |
84 | AliITShit *hit=mod->GetHit(ihit); | |
85 | hit->GetPositionG(hitx1,hity1,hitz1); | |
86 | hitstatus1 = hit->GetTrackStatus(); | |
87 | hitdestep1 = hit->GetIonization(); | |
88 | ||
89 | hittrack1 = hit->GetTrack(); | |
90 | ||
91 | mod->MedianHit(module,hitx1,hity1,hitz1,hitstatus1,xMg,yMg,zMg,flag); | |
92 | if (flag!=1) { | |
93 | hitx = xMg; | |
94 | hity = yMg; | |
95 | hitz = zMg; | |
96 | hit->GetDetectorID(hitlay,hitlad,hitdet); | |
97 | hit->GetMomentumG(hitpx,hitpy,hitpz); | |
98 | hitdestep = hit->GetIonization(); | |
99 | hitstatus = hitstatus1; | |
100 | hittrack = hit->GetTrack(); | |
101 | ||
102 | if (hitdestep > 0) { | |
103 | xg = hitx; | |
104 | yg = hity; | |
105 | zg = hitz; | |
106 | // Transform to the module local frame | |
107 | globals[0] = hitx; | |
108 | globals[1] = hity; | |
109 | globals[2] = hitz; | |
110 | gm->GtoL(hitlay,hitlad,hitdet,globals,locals); | |
111 | xl = locals[0]; | |
112 | yl = locals[1]; | |
113 | zl = locals[2]; | |
114 | px = hitpx; | |
115 | py = hitpy; | |
116 | pz = hitpz; | |
117 | /* | |
118 | // Calculate transverse momentum and pseudorapidity | |
119 | // to allow pt and eta dependence in sigma values | |
120 | // of the spatial resolution | |
121 | p = TMath::Sqrt((px*px)+(py*py)+(pz*pz)); | |
122 | theta = TMath::ACos(pz/p); | |
123 | pt = p * TMath::Sin(theta); | |
124 | ps = -TMath::Log(TMath::Tan(theta/2)); | |
125 | */ | |
126 | ||
127 | // Retrieve sigma values for position and energy, and energy | |
128 | // threshold | |
129 | ||
130 | sigmarphi = SigmaRPhi(hitlay); | |
131 | sigmaz = SigmaZ(hitlay); | |
132 | sigmade = SigmaDe(hitlay); | |
133 | thrde = ThrDe(hitlay); | |
134 | // Randomize position and deposited energy | |
135 | Int_t k=3*(Int_t)((hitlay-1)/2); | |
136 | ||
137 | deltaXl = (float)(random[k].Gaus(0,sigmarphi)); | |
138 | deltaZl = (float)(random[k+1].Gaus(0,sigmaz)); | |
139 | deltaDe = (float)(random[k+2].Gaus(0,sigmade)); | |
140 | // Apply energy threshold and trasform back to global reference | |
141 | // system | |
517784f0 | 142 | |
e8189707 | 143 | if ( (hitdestep+deltaDe) > thrde ){ |
144 | locals[0] = xl + deltaXl; | |
145 | locals[1] = yl; | |
146 | locals[2] = zl + deltaZl; | |
147 | AliITSRecPoint rp; | |
148 | rp.fTracks[0]=hittrack; | |
517784f0 | 149 | rp.fTracks[1]=-3; |
150 | rp.fTracks[2]=-3; | |
e8189707 | 151 | rp.SetX(locals[0]); |
152 | rp.SetZ(locals[2]); | |
153 | rp.SetdEdX(hitdestep+deltaDe); | |
154 | rp.SetQ(kdEdXtoQ*(hitdestep+deltaDe)); // number of e | |
155 | rp.SetSigmaX2(sigmarphi*sigmarphi); | |
156 | rp.SetSigmaZ2(sigmaz*sigmaz); | |
e8189707 | 157 | aliITS->AddRecPoint(rp); |
158 | /* | |
159 | gm->LtoG(hitlay,hitlad,hitdet,locals,globals); | |
160 | xg1 = globals[0]; | |
161 | yg1 = globals[1]; | |
162 | zg1 = globals[2]; | |
163 | dx = TMath::Abs(xg1-hitx); | |
164 | dy = TMath::Abs(yg1-hity); | |
165 | dz = TMath::Abs(zg1-hitz); | |
166 | ds = TMath::Abs(deltaDe); | |
167 | */ | |
168 | } // if ( (hitdestep+deltaDe) | |
169 | else flag=1; | |
170 | } // if (hitdestep > 0) | |
171 | else flag=1; | |
172 | } // if (flag!=1) | |
173 | } | |
b0f5e3fc | 174 | |
175 | } | |
e8189707 | 176 | //_______________________________________________________________________ |
177 | void AliITSsimulationFastPoints::SetSigmaRPhi(Double_t srphi[6]) | |
178 | { | |
179 | // set sigmas in rphi | |
b0f5e3fc | 180 | |
e8189707 | 181 | Int_t i; |
182 | for (i=0; i<6; i++) { | |
183 | fSigmaRPhi[i]=srphi[i]; | |
184 | } | |
b0f5e3fc | 185 | } |
186 | //_______________________________________________________________________ | |
e8189707 | 187 | void AliITSsimulationFastPoints::SetSigmaZ(Double_t sz[6]) |
188 | { | |
189 | // set sigmas in z | |
190 | ||
191 | Int_t i; | |
192 | for (i=0; i<6; i++) { | |
193 | fSigmaZ[i]=sz[i]; | |
194 | } | |
b0f5e3fc | 195 | } |
196 | //_______________________________________________________________________ | |
e8189707 | 197 | void AliITSsimulationFastPoints::SetSigmaDe(Double_t sde[6]) |
198 | { | |
199 | // set sigmas in energy | |
200 | ||
201 | Int_t i; | |
202 | for (i=0; i<6; i++) { | |
203 | fSigmaDe[i]=sde[i]; | |
204 | } | |
b0f5e3fc | 205 | } |
206 | //_______________________________________________________________________ | |
e8189707 | 207 | void AliITSsimulationFastPoints::SetThrDe(Double_t thrde[6]) |
208 | { | |
209 | // set energy thersholds | |
210 | ||
211 | Int_t i; | |
212 | for (i=0; i<6; i++) { | |
213 | fThrDe[i]=thrde[i]; | |
214 | } | |
b0f5e3fc | 215 | } |
e8189707 | 216 |