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 **************************************************************************/
22 #include "AliITShit.h"
23 #include "AliITSRecPoint.h"
24 #include "AliITSmodule.h"
25 #include "AliITSgeom.h"
27 #include "AliITSsimulationFastPoints.h"
30 ClassImp(AliITSsimulationFastPoints)
32 AliITSsimulationFastPoints::AliITSsimulationFastPoints()
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;
49 //-------------------------------------------------------------
50 void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule *mod, Int_t module, TRandom *random){
51 // Fast points simulator
53 AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
54 AliITSgeom *gm = aliITS->GetITSgeom();
56 const Float_t kdEdXtoQ = 2.778e+8;
58 Int_t ihit,flag,numofhits;
59 Float_t xg,yg,zg,xl,yl,zl;
61 //Double_t p, theta, pt, ps;
64 //Float_t xg1,yg1,zg1;
65 Double_t sigmarphi=0., sigmaz=0., sigmade=0., thrde=0.;
66 Float_t deltaXl,deltaZl,deltaDe;
68 Int_t hitlay, hitlad, hitdet, hitstatus, hittrack;
69 Float_t hitx, hity, hitz, hitpx, hitpy, hitpz, hitdestep;
72 Int_t hitstatus1, hittrack1;
73 Float_t hitx1, hity1, hitz1;
77 //Float_t dx,dy,dz,ds;
80 numofhits = mod->GetNhits();
81 printf("numofhits %d \n",numofhits);
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();
89 hittrack1 = hit->GetTrack();
91 mod->MedianHit(module,hitx1,hity1,hitz1,hitstatus1,xMg,yMg,zMg,flag);
96 hit->GetDetectorID(hitlay,hitlad,hitdet);
97 hit->GetMomentumG(hitpx,hitpy,hitpz);
98 hitdestep = hit->GetIonization();
99 hitstatus = hitstatus1;
100 hittrack = hit->GetTrack();
106 // Transform to the module local frame
110 gm->GtoL(hitlay,hitlad,hitdet,globals,locals);
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));
127 // Retrieve sigma values for position and energy, and energy
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);
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
143 if ( (hitdestep+deltaDe) > thrde ){
144 locals[0] = xl + deltaXl;
146 locals[2] = zl + deltaZl;
148 rp.fTracks[0]=hittrack;
153 rp.SetdEdX(hitdestep+deltaDe);
154 rp.SetQ(kdEdXtoQ*(hitdestep+deltaDe)); // number of e
155 rp.SetSigmaX2(sigmarphi*sigmarphi);
156 rp.SetSigmaZ2(sigmaz*sigmaz);
157 aliITS->AddRecPoint(rp);
159 gm->LtoG(hitlay,hitlad,hitdet,locals,globals);
163 dx = TMath::Abs(xg1-hitx);
164 dy = TMath::Abs(yg1-hity);
165 dz = TMath::Abs(zg1-hitz);
166 ds = TMath::Abs(deltaDe);
168 } // if ( (hitdestep+deltaDe)
170 } // if (hitdestep > 0)
176 //_______________________________________________________________________
177 void AliITSsimulationFastPoints::SetSigmaRPhi(Double_t srphi[6])
179 // set sigmas in rphi
182 for (i=0; i<6; i++) {
183 fSigmaRPhi[i]=srphi[i];
186 //_______________________________________________________________________
187 void AliITSsimulationFastPoints::SetSigmaZ(Double_t sz[6])
192 for (i=0; i<6; i++) {
196 //_______________________________________________________________________
197 void AliITSsimulationFastPoints::SetSigmaDe(Double_t sde[6])
199 // set sigmas in energy
202 for (i=0; i<6; i++) {
206 //_______________________________________________________________________
207 void AliITSsimulationFastPoints::SetThrDe(Double_t thrde[6])
209 // set energy thersholds
212 for (i=0; i<6; i++) {