1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
17 //////////////////////////////////////////////////////////
18 // implements fast simulation //
21 //////////////////////////////////////////////////////////
27 #include "AliITShit.h"
28 #include "AliITSRecPoint.h"
29 #include "AliITSmodule.h"
30 #include "AliITSgeom.h"
32 #include "AliITSsimulationFastPoints.h"
35 ClassImp(AliITSsimulationFastPoints)
37 AliITSsimulationFastPoints::AliITSsimulationFastPoints()
40 fSigmaRPhi[0] = fSigmaRPhi[1] = 12e-4;
41 fSigmaRPhi[2] = fSigmaRPhi[3] = 38e-4;
42 fSigmaRPhi[4] = fSigmaRPhi[5] = 20e-4;
43 fSigmaZ[0] = fSigmaZ[1] = 120e-4; // resolution for 425 micron pixels
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;
54 //-------------------------------------------------------------
55 void AliITSsimulationFastPoints::CreateFastRecPoints(Int_t module, TClonesArray* recp){
56 // Fast points simulator
57 AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
59 CreateFastRecPoints((AliITSmodule *)(aliITS->GetModule(module)),
62 //-------------------------------------------------------------
63 void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule *mod,
67 // Fast points simulator
69 TClonesArray &pt=*recp;
70 AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
71 AliITSgeom *gm = aliITS->GetITSgeom();
72 const Float_t kdEdXtoQ = 1.0e+6; // GeV->KeV
75 gm->GetModuleId(module,lay,lad,det);
76 Int_t ind=(lad-1)*gm->GetNdetectors(lay)+(det-1);
80 Int_t ihit,flag,numofhits;
83 Double_t sigmarphi=0., sigmaz=0., sigmade=0., thrde=0.;
84 Float_t deltaXl,deltaZl,deltaDe;
86 Int_t hitlay, hitlad, hitdet, hitstatus;
87 Float_t hitpx, hitpy, hitpz, hitdestep;
89 Int_t hitstatus1, hittrack1;
90 Float_t hitx1, hity1, hitz1;
94 numofhits = mod->GetNhits();
95 //printf("numofhits %d \n",numofhits);
96 for(ihit=0;ihit<numofhits;ihit++){
97 AliITShit *hit=mod->GetHit(ihit);
98 hit->GetPositionG(hitx1,hity1,hitz1);
99 hitstatus1 = hit->GetTrackStatus();
100 hitdestep1 = hit->GetIonization();
101 hittrack1 = hit->GetTrack();
103 mod->MedianHit(module,hitx1,hity1,hitz1,hitstatus1,xMg,yMg,zMg,flag);
105 hitdestep = hit->GetIonization();
108 hit->GetDetectorID(hitlay,hitlad,hitdet);
109 hit->GetMomentumG(hitpx,hitpy,hitpz);
110 hitstatus = hitstatus1;
111 // Transform to the module local frame
115 gm->GtoL(hitlay,hitlad,hitdet,globals,locals);
116 // Retrieve sigma values for position and energy, and energy
118 sigmarphi = SigmaRPhi(hitlay);
119 sigmaz = SigmaZ(hitlay);
120 sigmade = SigmaDe(hitlay);
121 thrde = ThrDe(hitlay);
122 deltaXl = random->Gaus(0,sigmarphi);
123 deltaZl = random->Gaus(0,sigmaz);
124 deltaDe = random->Gaus(0,sigmade);
126 // Apply energy threshold and trasform back to global reference
129 if ( (hitdestep+deltaDe) > thrde ){
130 locals[0] += deltaXl;
131 locals[2] += deltaZl;
132 Int_t lab[4] = {hit->GetTrack(),-3,-3,ind};
133 Float_t q=kdEdXtoQ*(hitdestep+deltaDe);
134 if(hitlay<3) q=1.; // SPD binary readout
135 Float_t hitv[6] = {locals[0],locals[2],sigmarphi*sigmarphi,sigmaz*sigmaz,q,q};
136 Int_t info[3] = {0,0,lyr};
137 AliITSRecPoint rp(lab,hitv,info,kTRUE);
139 new (pt[irecp]) AliITSRecPoint(rp);
141 } // end if ( (hitdestep+deltaDe)
142 } // end if (hitdestep > 0)
143 } // end if (flag!=1)
146 //_______________________________________________________________________
147 void AliITSsimulationFastPoints::SetSigmaRPhi(Double_t srphi[6])
149 // set sigmas in rphi
152 for (i=0; i<6; i++) {
153 fSigmaRPhi[i]=srphi[i];
156 //_______________________________________________________________________
157 void AliITSsimulationFastPoints::SetSigmaZ(Double_t sz[6])
162 for (i=0; i<6; i++) {
166 //_______________________________________________________________________
167 void AliITSsimulationFastPoints::SetSigmaDe(Double_t sde[6])
169 // set sigmas in energy
172 for (i=0; i<6; i++) {
176 //_______________________________________________________________________
177 void AliITSsimulationFastPoints::SetThrDe(Double_t thrde[6])
179 // set energy thersholds
182 for (i=0; i<6; i++) {