]>
Commit | Line | Data |
---|---|---|
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" |
e8189707 | 22 | #include "AliRun.h" |
b0f5e3fc | 23 | #include "AliITSsimulationFastPoints.h" |
e8189707 | 24 | |
b0f5e3fc | 25 | |
26 | ClassImp(AliITSsimulationFastPoints) | |
27 | ||
28 | AliITSsimulationFastPoints::AliITSsimulationFastPoints() | |
29 | { | |
30 | //constructor | |
e8189707 | 31 | fSigmaRPhi[0] = fSigmaRPhi[1] = 12e-4; |
32 | fSigmaRPhi[2] = fSigmaRPhi[3] = 38e-4; | |
33 | fSigmaRPhi[4] = fSigmaRPhi[5] = 20e-4; | |
34 | fSigmaZ[0] = fSigmaZ[1] = 70e-4; | |
35 | fSigmaZ[2] = fSigmaZ[3] = 28e-4; | |
36 | fSigmaZ[4] = fSigmaZ[5] = 830e-4; | |
37 | fSigmaDe[0] = fSigmaDe[1] = 0.72e-6; | |
38 | fSigmaDe[2] = fSigmaDe[3] = 0.90e-6; | |
39 | fSigmaDe[4] = fSigmaDe[5] = 5e-6; | |
40 | fThrDe[0] = fThrDe[1] = 7.2e-6; | |
41 | fThrDe[2] = fThrDe[3] = 2.70e-6; | |
42 | fThrDe[4] = fThrDe[5] = 10e-6; | |
b0f5e3fc | 43 | } |
44 | ||
e8189707 | 45 | //------------------------------------------------------------- |
46 | void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule *mod, Int_t module, TRandom *random){ | |
47 | // Fast points simulator | |
48 | ||
49 | AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
50 | AliITSgeom *gm = aliITS->GetITSgeom(); | |
51 | ||
52 | const Float_t kdEdXtoQ = 2.778e+8; | |
53 | ||
54 | Int_t ihit,flag,numofhits; | |
55 | Float_t xg,yg,zg,xl,yl,zl; | |
56 | Float_t px,py,pz; | |
57 | //Double_t p, theta, pt, ps; | |
58 | Float_t locals[3]; | |
59 | Float_t globals[3]; | |
60 | //Float_t xg1,yg1,zg1; | |
61 | Double_t sigmarphi=0., sigmaz=0., sigmade=0., thrde=0.; | |
62 | Float_t deltaXl,deltaZl,deltaDe; | |
63 | ||
64 | Int_t hitlay, hitlad, hitdet, hitstatus, hittrack; | |
65 | Float_t hitx, hity, hitz, hitpx, hitpy, hitpz, hitdestep; | |
66 | ||
67 | ||
68 | Int_t hitstatus1, hittrack1; | |
69 | Float_t hitx1, hity1, hitz1; | |
70 | Float_t hitdestep1; | |
71 | ||
72 | Float_t xMg,yMg,zMg; | |
73 | //Float_t dx,dy,dz,ds; | |
74 | ||
75 | ||
76 | numofhits = mod->GetNhits(); | |
77 | flag = 1; | |
78 | for(ihit=0;ihit<numofhits;ihit++){ | |
79 | AliITShit *hit=mod->GetHit(ihit); | |
80 | hit->GetPositionG(hitx1,hity1,hitz1); | |
81 | hitstatus1 = hit->GetTrackStatus(); | |
82 | hitdestep1 = hit->GetIonization(); | |
83 | ||
84 | hittrack1 = hit->GetTrack(); | |
85 | ||
86 | mod->MedianHit(module,hitx1,hity1,hitz1,hitstatus1,xMg,yMg,zMg,flag); | |
87 | if (flag!=1) { | |
88 | hitx = xMg; | |
89 | hity = yMg; | |
90 | hitz = zMg; | |
91 | hit->GetDetectorID(hitlay,hitlad,hitdet); | |
92 | hit->GetMomentumG(hitpx,hitpy,hitpz); | |
93 | hitdestep = hit->GetIonization(); | |
94 | hitstatus = hitstatus1; | |
95 | hittrack = hit->GetTrack(); | |
96 | ||
97 | if (hitdestep > 0) { | |
98 | xg = hitx; | |
99 | yg = hity; | |
100 | zg = hitz; | |
101 | // Transform to the module local frame | |
102 | globals[0] = hitx; | |
103 | globals[1] = hity; | |
104 | globals[2] = hitz; | |
105 | gm->GtoL(hitlay,hitlad,hitdet,globals,locals); | |
106 | xl = locals[0]; | |
107 | yl = locals[1]; | |
108 | zl = locals[2]; | |
109 | px = hitpx; | |
110 | py = hitpy; | |
111 | pz = hitpz; | |
112 | /* | |
113 | // Calculate transverse momentum and pseudorapidity | |
114 | // to allow pt and eta dependence in sigma values | |
115 | // of the spatial resolution | |
116 | p = TMath::Sqrt((px*px)+(py*py)+(pz*pz)); | |
117 | theta = TMath::ACos(pz/p); | |
118 | pt = p * TMath::Sin(theta); | |
119 | ps = -TMath::Log(TMath::Tan(theta/2)); | |
120 | */ | |
121 | ||
122 | // Retrieve sigma values for position and energy, and energy | |
123 | // threshold | |
124 | ||
125 | sigmarphi = SigmaRPhi(hitlay); | |
126 | sigmaz = SigmaZ(hitlay); | |
127 | sigmade = SigmaDe(hitlay); | |
128 | thrde = ThrDe(hitlay); | |
129 | // Randomize position and deposited energy | |
130 | Int_t k=3*(Int_t)((hitlay-1)/2); | |
131 | ||
132 | deltaXl = (float)(random[k].Gaus(0,sigmarphi)); | |
133 | deltaZl = (float)(random[k+1].Gaus(0,sigmaz)); | |
134 | deltaDe = (float)(random[k+2].Gaus(0,sigmade)); | |
135 | // Apply energy threshold and trasform back to global reference | |
136 | // system | |
137 | if ( (hitdestep+deltaDe) > thrde ){ | |
138 | locals[0] = xl + deltaXl; | |
139 | locals[1] = yl; | |
140 | locals[2] = zl + deltaZl; | |
141 | AliITSRecPoint rp; | |
142 | rp.fTracks[0]=hittrack; | |
143 | rp.fTracks[1]=0; | |
144 | rp.fTracks[2]=0; | |
145 | rp.SetX(locals[0]); | |
146 | rp.SetZ(locals[2]); | |
147 | rp.SetdEdX(hitdestep+deltaDe); | |
148 | rp.SetQ(kdEdXtoQ*(hitdestep+deltaDe)); // number of e | |
149 | rp.SetSigmaX2(sigmarphi*sigmarphi); | |
150 | rp.SetSigmaZ2(sigmaz*sigmaz); | |
151 | rp.SetProbability(1.0); | |
152 | aliITS->AddRecPoint(rp); | |
153 | /* | |
154 | gm->LtoG(hitlay,hitlad,hitdet,locals,globals); | |
155 | xg1 = globals[0]; | |
156 | yg1 = globals[1]; | |
157 | zg1 = globals[2]; | |
158 | dx = TMath::Abs(xg1-hitx); | |
159 | dy = TMath::Abs(yg1-hity); | |
160 | dz = TMath::Abs(zg1-hitz); | |
161 | ds = TMath::Abs(deltaDe); | |
162 | */ | |
163 | } // if ( (hitdestep+deltaDe) | |
164 | else flag=1; | |
165 | } // if (hitdestep > 0) | |
166 | else flag=1; | |
167 | } // if (flag!=1) | |
168 | } | |
b0f5e3fc | 169 | |
170 | } | |
e8189707 | 171 | //_______________________________________________________________________ |
172 | void AliITSsimulationFastPoints::SetSigmaRPhi(Double_t srphi[6]) | |
173 | { | |
174 | // set sigmas in rphi | |
b0f5e3fc | 175 | |
e8189707 | 176 | Int_t i; |
177 | for (i=0; i<6; i++) { | |
178 | fSigmaRPhi[i]=srphi[i]; | |
179 | } | |
b0f5e3fc | 180 | } |
181 | //_______________________________________________________________________ | |
e8189707 | 182 | void AliITSsimulationFastPoints::SetSigmaZ(Double_t sz[6]) |
183 | { | |
184 | // set sigmas in z | |
185 | ||
186 | Int_t i; | |
187 | for (i=0; i<6; i++) { | |
188 | fSigmaZ[i]=sz[i]; | |
189 | } | |
b0f5e3fc | 190 | } |
191 | //_______________________________________________________________________ | |
e8189707 | 192 | void AliITSsimulationFastPoints::SetSigmaDe(Double_t sde[6]) |
193 | { | |
194 | // set sigmas in energy | |
195 | ||
196 | Int_t i; | |
197 | for (i=0; i<6; i++) { | |
198 | fSigmaDe[i]=sde[i]; | |
199 | } | |
b0f5e3fc | 200 | } |
201 | //_______________________________________________________________________ | |
e8189707 | 202 | void AliITSsimulationFastPoints::SetThrDe(Double_t thrde[6]) |
203 | { | |
204 | // set energy thersholds | |
205 | ||
206 | Int_t i; | |
207 | for (i=0; i<6; i++) { | |
208 | fThrDe[i]=thrde[i]; | |
209 | } | |
b0f5e3fc | 210 | } |
e8189707 | 211 |