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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 | ||
88cb7938 | 16 | /* $Id$ */ |
7d62fb64 | 17 | ////////////////////////////////////////////////////////// |
18 | // implements fast simulation // | |
19 | // // | |
20 | // // | |
21 | ////////////////////////////////////////////////////////// | |
22 | ||
b9d0a01d | 23 | |
e8189707 | 24 | #include <TRandom.h> |
b0f5e3fc | 25 | |
b0f5e3fc | 26 | #include "AliITS.h" |
517784f0 | 27 | #include "AliITShit.h" |
28 | #include "AliITSRecPoint.h" | |
29 | #include "AliITSmodule.h" | |
30 | #include "AliITSgeom.h" | |
e8189707 | 31 | #include "AliRun.h" |
b0f5e3fc | 32 | #include "AliITSsimulationFastPoints.h" |
e8189707 | 33 | |
b0f5e3fc | 34 | |
35 | ClassImp(AliITSsimulationFastPoints) | |
36 | ||
37 | AliITSsimulationFastPoints::AliITSsimulationFastPoints() | |
38 | { | |
39 | //constructor | |
e8189707 | 40 | fSigmaRPhi[0] = fSigmaRPhi[1] = 12e-4; |
41 | fSigmaRPhi[2] = fSigmaRPhi[3] = 38e-4; | |
42 | fSigmaRPhi[4] = fSigmaRPhi[5] = 20e-4; | |
21d3c626 | 43 | fSigmaZ[0] = fSigmaZ[1] = 120e-4; // resolution for 425 micron pixels |
e8189707 | 44 | fSigmaZ[2] = fSigmaZ[3] = 28e-4; |
45 | fSigmaZ[4] = fSigmaZ[5] = 830e-4; | |
46 | fSigmaDe[0] = fSigmaDe[1] = 0.72e-6; | |
47 | fSigmaDe[2] = fSigmaDe[3] = 0.90e-6; | |
48 | fSigmaDe[4] = fSigmaDe[5] = 5e-6; | |
49 | fThrDe[0] = fThrDe[1] = 7.2e-6; | |
50 | fThrDe[2] = fThrDe[3] = 2.70e-6; | |
51 | fThrDe[4] = fThrDe[5] = 10e-6; | |
b0f5e3fc | 52 | } |
53 | ||
e8189707 | 54 | //------------------------------------------------------------- |
7d62fb64 | 55 | void AliITSsimulationFastPoints::CreateFastRecPoints(Int_t module, TClonesArray* recp){ |
785086f0 | 56 | // Fast points simulator |
57 | AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
b0f5e3fc | 58 | |
785086f0 | 59 | CreateFastRecPoints((AliITSmodule *)(aliITS->GetModule(module)), |
7d62fb64 | 60 | module,gRandom,recp); |
785086f0 | 61 | } |
62 | //------------------------------------------------------------- | |
63 | void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule *mod, | |
64 | Int_t module, | |
7d62fb64 | 65 | TRandom *random, |
66 | TClonesArray* recp) { | |
67 | // Fast points simulator | |
68 | ||
69 | TClonesArray &pt=*recp; | |
70 | AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
71 | AliITSgeom *gm = aliITS->GetITSgeom(); | |
72 | const Float_t kdEdXtoQ = 2.778e+8; | |
73 | ||
74 | Int_t ihit,flag,numofhits; | |
75 | Float_t locals[3]; | |
76 | Float_t globals[3]; | |
77 | Double_t sigmarphi=0., sigmaz=0., sigmade=0., thrde=0.; | |
78 | Float_t deltaXl,deltaZl,deltaDe; | |
79 | ||
80 | Int_t hitlay, hitlad, hitdet, hitstatus; | |
81 | Float_t hitpx, hitpy, hitpz, hitdestep; | |
82 | ||
83 | Int_t hitstatus1, hittrack1; | |
84 | Float_t hitx1, hity1, hitz1; | |
85 | Float_t hitdestep1; | |
86 | Float_t xMg,yMg,zMg; | |
87 | Int_t irecp=0; | |
88 | numofhits = mod->GetNhits(); | |
89 | //printf("numofhits %d \n",numofhits); | |
90 | for(ihit=0;ihit<numofhits;ihit++){ | |
91 | AliITShit *hit=mod->GetHit(ihit); | |
92 | hit->GetPositionG(hitx1,hity1,hitz1); | |
93 | hitstatus1 = hit->GetTrackStatus(); | |
94 | hitdestep1 = hit->GetIonization(); | |
95 | hittrack1 = hit->GetTrack(); | |
96 | ||
97 | mod->MedianHit(module,hitx1,hity1,hitz1,hitstatus1,xMg,yMg,zMg,flag); | |
98 | if (flag!=1) { | |
99 | hitdestep = hit->GetIonization(); | |
100 | ||
101 | if (hitdestep > 0) { | |
102 | hit->GetDetectorID(hitlay,hitlad,hitdet); | |
103 | hit->GetMomentumG(hitpx,hitpy,hitpz); | |
104 | hitstatus = hitstatus1; | |
785086f0 | 105 | // Transform to the module local frame |
7d62fb64 | 106 | globals[0] = xMg; |
107 | globals[1] = yMg; | |
108 | globals[2] = zMg; | |
109 | gm->GtoL(hitlay,hitlad,hitdet,globals,locals); | |
110 | // Retrieve sigma values for position and energy, and energy | |
111 | // threshold | |
112 | sigmarphi = SigmaRPhi(hitlay); | |
113 | sigmaz = SigmaZ(hitlay); | |
114 | sigmade = SigmaDe(hitlay); | |
115 | thrde = ThrDe(hitlay); | |
116 | deltaXl = random->Gaus(0,sigmarphi); | |
117 | deltaZl = random->Gaus(0,sigmaz); | |
118 | deltaDe = random->Gaus(0,sigmade); | |
119 | ||
120 | // Apply energy threshold and trasform back to global reference | |
121 | // system | |
122 | ||
123 | if ( (hitdestep+deltaDe) > thrde ){ | |
124 | locals[0] += deltaXl; | |
125 | locals[2] += deltaZl; | |
126 | AliITSRecPoint rp; | |
127 | rp.fTracks[0]=hit->GetTrack(); | |
128 | // rp.fTracks[0]=mod->GetHitTrackIndex(ihit); | |
129 | rp.fTracks[1]=-3; | |
130 | rp.fTracks[2]=-3; | |
131 | rp.SetX(locals[0]); | |
132 | rp.SetZ(locals[2]); | |
133 | rp.SetdEdX(hitdestep+deltaDe); | |
134 | rp.SetQ(kdEdXtoQ*(hitdestep+deltaDe)); // number of e | |
135 | rp.SetSigmaX2(sigmarphi*sigmarphi); | |
136 | rp.SetSigmaZ2(sigmaz*sigmaz); | |
137 | new (pt[irecp]) AliITSRecPoint(rp); | |
138 | irecp++; | |
139 | } // end if ( (hitdestep+deltaDe) | |
140 | } // end if (hitdestep > 0) | |
141 | } // end if (flag!=1) | |
142 | } // end for ihit | |
b0f5e3fc | 143 | } |
e8189707 | 144 | //_______________________________________________________________________ |
145 | void AliITSsimulationFastPoints::SetSigmaRPhi(Double_t srphi[6]) | |
146 | { | |
147 | // set sigmas in rphi | |
b0f5e3fc | 148 | |
e8189707 | 149 | Int_t i; |
150 | for (i=0; i<6; i++) { | |
151 | fSigmaRPhi[i]=srphi[i]; | |
152 | } | |
b0f5e3fc | 153 | } |
154 | //_______________________________________________________________________ | |
e8189707 | 155 | void AliITSsimulationFastPoints::SetSigmaZ(Double_t sz[6]) |
156 | { | |
157 | // set sigmas in z | |
158 | ||
159 | Int_t i; | |
160 | for (i=0; i<6; i++) { | |
161 | fSigmaZ[i]=sz[i]; | |
162 | } | |
b0f5e3fc | 163 | } |
164 | //_______________________________________________________________________ | |
e8189707 | 165 | void AliITSsimulationFastPoints::SetSigmaDe(Double_t sde[6]) |
166 | { | |
167 | // set sigmas in energy | |
168 | ||
169 | Int_t i; | |
170 | for (i=0; i<6; i++) { | |
171 | fSigmaDe[i]=sde[i]; | |
172 | } | |
b0f5e3fc | 173 | } |
174 | //_______________________________________________________________________ | |
e8189707 | 175 | void AliITSsimulationFastPoints::SetThrDe(Double_t thrde[6]) |
176 | { | |
177 | // set energy thersholds | |
178 | ||
179 | Int_t i; | |
180 | for (i=0; i<6; i++) { | |
181 | fThrDe[i]=thrde[i]; | |
182 | } | |
b0f5e3fc | 183 | } |
e8189707 | 184 |