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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 | $Log$ | |
18 | Revision 1.1.2.1 2000/06/11 20:16:05 barbera | |
19 | New: Fast simulation class for the ITS, class as part of new ITS code | |
20 | structure. | |
21 | ||
22 | */ | |
23 | ||
24 | #include <TParticle.h> | |
25 | #include "AliITS.h" | |
26 | #include "AliITSsimulationFastPoints.h" | |
27 | #include "AliITSstatistics.h" | |
28 | ||
29 | ClassImp(AliITSsimulationFastPoints) | |
30 | ||
31 | AliITSsimulationFastPoints::AliITSsimulationFastPoints() | |
32 | { | |
33 | //constructor | |
34 | fSx = new AliITSstatistics(2); | |
35 | fSz = new AliITSstatistics(2); | |
36 | } | |
37 | ||
38 | //---------------------------------------------------------- | |
39 | AliITSsimulationFastPoints::~AliITSsimulationFastPoints() | |
40 | { | |
41 | //destructor | |
42 | delete fSx; | |
43 | delete fSz; | |
44 | ||
45 | } | |
46 | ||
47 | //------------------------------------------------------------- | |
48 | void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule *mod){ | |
49 | // Fast points simulator for all of the ITS. | |
50 | Int_t nhit,h,trk,ifirst; | |
51 | Float_t x,y,z,t,e;// local coordinate (cm) and time of flight, and dedx. | |
52 | Float_t x1,y1,z1; | |
53 | AliITShit *hit; | |
54 | ||
55 | fSx->Reset(); // Start out with things clearly zeroed | |
56 | fSz->Reset(); // Start out with things clearly zeroed | |
57 | e = 0.; // Start out with things clearly zeroed | |
58 | Double_t weight=1.; | |
59 | nhit = mod->GetNhits(); | |
60 | ifirst = 1; | |
61 | for(h=0;h<nhit;h++){ | |
62 | hit = mod->GetHit(h); | |
63 | hit->GetPositionL(x,y,z,t); | |
64 | if(ifirst) {x1=x;y1=y;z1=z;} | |
65 | e += hit->GetIonization(); | |
66 | trk = hit->GetTrack(); | |
67 | fSx->AddValue((Double_t)x,weight); | |
68 | fSz->AddValue((Double_t)z,weight); | |
69 | ifirst = 0; | |
70 | if(hit->StatusExiting()|| // leaving volume | |
71 | hit->StatusDisappeared()|| // interacted/decayed... | |
72 | hit->StatusStop() // dropped below E cuts. | |
73 | ){ // exiting track, write out RecPoint. | |
74 | // if(fSz->GetRMS()>1.E-1) { | |
75 | // TParticle *part = hit->GetParticle(); | |
76 | // printf("idpart %d energy %f \n",part->GetPdgCode(),part->Energy()); | |
77 | // printf("diffx=%e diffy=%e diffz=%e\n",x-x1,y-y1,z-z1); | |
78 | // } | |
79 | switch (mod->GetLayer()){ | |
80 | case 1: case 2: // SPDs | |
81 | AddSPD(e,mod,trk); | |
82 | break; | |
83 | case 3: case 4: // SDDs | |
84 | AddSDD(e,mod,trk); | |
85 | break; | |
86 | case 5: case 6: // SSDs | |
87 | AddSSD(e,mod,trk); | |
88 | break; | |
89 | } // end switch | |
90 | fSx->Reset(); | |
91 | fSz->Reset(); | |
92 | e = 0.; | |
93 | ifirst = 1; | |
94 | continue; | |
95 | }// end if | |
96 | } // end for h | |
97 | } | |
98 | //_______________________________________________________________________ | |
99 | void AliITSsimulationFastPoints::AddSPD(Float_t &e, | |
100 | AliITSmodule *mod,Int_t trackNumber){ | |
101 | const Float_t kcmTomicron = 1.0e4; | |
102 | // const Float_t kdEdXtoQ = ; | |
103 | const Float_t kRMSx = 12.0; // microns ITS TDR Table 1.3 | |
104 | const Float_t kRMSz = 70.0; // microns ITS TDR Table 1.3 | |
105 | Float_t a1,a2; // general float. | |
106 | AliITSRecPoint rpSPD; | |
107 | Int_t *trk = rpSPD.GetTracks(); | |
108 | ||
109 | trk[0] = trackNumber; | |
110 | trk[1] = 0; trk[2] = 0; | |
111 | rpSPD.SetX(kcmTomicron*fSx->GetMean()); | |
112 | rpSPD.SetZ(kcmTomicron*fSz->GetMean()); | |
113 | rpSPD.SetdEdX(0.0); | |
114 | rpSPD.SetQ(1.0); | |
115 | a1 = kcmTomicron*fSx->GetRMS(); a1 *= a1; a1 += kRMSx*kRMSx; | |
116 | // if(a1>1.E5) printf("addSPD: layer=%d track #%d dedx=%e sigmaX2= %e ", | |
117 | // mod->GetLayer(),trackNumber,e,a1); | |
118 | rpSPD.SetSigmaX2(a1); | |
119 | a2 = kcmTomicron*fSz->GetRMS(); a2 *= a2; a2 += kRMSz*kRMSz; | |
120 | // if(a1>1.E5) printf(" sigmaZ2= %e\n",a2); | |
121 | rpSPD.SetSigmaZ2(a2); | |
122 | rpSPD.SetProbability(1.0); | |
123 | ||
124 | (mod->GetITS())->AddRecPoint(rpSPD); | |
125 | } | |
126 | //_______________________________________________________________________ | |
127 | void AliITSsimulationFastPoints::AddSDD(Float_t &e, | |
128 | AliITSmodule *mod,Int_t trackNumber){ | |
129 | ||
130 | const Float_t kcmTomicron = 1.0e4; | |
131 | const Float_t kdEdXtoQ = 2.778e+8; // Boris Batyuna June 10 2000. | |
132 | const Float_t kRMSx = 38.0; // microns ITS TDR Table 1.3 | |
133 | const Float_t kRMSz = 28.0; // microns ITS TDR Table 1.3 | |
134 | Float_t a1,a2; // general float. | |
135 | AliITSRecPoint rpSDD; | |
136 | Int_t *trk = rpSDD.GetTracks(); | |
137 | ||
138 | trk[0] = trackNumber; | |
139 | trk[1] = 0; trk[2] = 0; | |
140 | rpSDD.SetX(kcmTomicron*fSx->GetMean()); | |
141 | rpSDD.SetZ(kcmTomicron*fSz->GetMean()); | |
142 | rpSDD.SetdEdX(e); | |
143 | rpSDD.SetQ(kdEdXtoQ*e); | |
144 | a1 = kcmTomicron*fSx->GetRMS(); a1 *= a1; a1 += kRMSx*kRMSx; | |
145 | // if(a1>1.E5) printf("addSDD: layer=%d track #%d dedx=%e sigmaX2= %e ", | |
146 | // mod->GetLayer(),trackNumber,e,a1); | |
147 | rpSDD.SetSigmaX2(a1); | |
148 | a2 = kcmTomicron*fSz->GetRMS(); a2 *= a2; a2 += kRMSz*kRMSz; | |
149 | // if(a1>1.E5) printf(" sigmaZ2= %e\n",a2); | |
150 | rpSDD.SetSigmaZ2(a2); | |
151 | rpSDD.SetProbability(1.0); | |
152 | ||
153 | (mod->GetITS())->AddRecPoint(rpSDD); | |
154 | } | |
155 | //_______________________________________________________________________ | |
156 | void AliITSsimulationFastPoints::AddSSD(Float_t &e, | |
157 | AliITSmodule *mod,Int_t trackNumber){ | |
158 | ||
159 | const Float_t kcmTomicron = 1.0e4; | |
160 | const Float_t kdEdXtoQ = 2.778e+8; // Boris Batyuna June 10 2000. | |
161 | const Float_t kRMSx = 20.0; // microns ITS TDR Table 1.3 | |
162 | const Float_t kRMSz = 830.0; // microns ITS TDR Table 1.3 | |
163 | Float_t a1,a2; // general float. | |
164 | AliITSRecPoint rpSSD; | |
165 | Int_t *trk = rpSSD.GetTracks(); | |
166 | ||
167 | trk[0] = trackNumber; | |
168 | trk[1] = 0; trk[2] = 0; | |
169 | rpSSD.SetX(kcmTomicron*fSx->GetMean()); | |
170 | rpSSD.SetZ(kcmTomicron*fSz->GetMean()); | |
171 | rpSSD.SetdEdX(e); | |
172 | rpSSD.SetQ(kdEdXtoQ*e); | |
173 | a1 = kcmTomicron*fSx->GetRMS(); a1 *= a1; a1 += kRMSx*kRMSx; | |
174 | // if(a1>1.E5) printf("addSSD: layer=%d track #%d dedx=%e sigmaX2= %e ", | |
175 | // mod->GetLayer(),trackNumber,e,a1); | |
176 | rpSSD.SetSigmaX2(a1); | |
177 | a2 = kcmTomicron*fSz->GetRMS(); a2 *= a2; a2 += kRMSz*kRMSz; | |
178 | // if(a1>1.E5) printf(" sigmaZ2= %e RMSx=%e RMSz=%e\n",a2,fSx->GetRMS(),fSz->GetRMS()); | |
179 | rpSSD.SetSigmaZ2(a2); | |
180 | rpSSD.SetProbability(1.0); | |
181 | ||
182 | (mod->GetITS())->AddRecPoint(rpSSD); | |
183 | } | |
184 | //_______________________________________________________________________ |