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[u/mrichter/AliRoot.git] / RICH / AliRICHChamber.cxx
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2e5f0f7b 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 $Log$
237c933d 18 Revision 1.2 2000/05/18 13:45:57 jbarbosa
19 Fixed feedback photon origin coordinates
20
64cdfc12 21 Revision 1.1 2000/04/19 12:57:20 morsch
22 Newly structured and updated version (JB, AM)
23
2e5f0f7b 24*/
25
26
27#include "AliRICHChamber.h"
237c933d 28
2e5f0f7b 29#include <TLorentzVector.h>
30#include <TParticle.h>
31#include <TRandom.h>
32
33ClassImp(AliRICHChamber)
34
35AliRICHChamber::AliRICHChamber()
36{
237c933d 37
38//
39// Chamber object constructor
40
2e5f0f7b 41 fSegmentation = 0;
42 fResponse= 0;
43 fGeometry= 0;
44 frMin=0.1;
45 frMax=140;
46 fnsec=1;
47}
48
237c933d 49AliRICHChamber::AliRICHChamber(const AliRICHChamber& Chamber)
50{
51// Copy Constructor
52}
53
54
2e5f0f7b 55AliRICHResponse* AliRICHChamber::GetResponseModel()
56{
237c933d 57//
58// Get reference to response model
2e5f0f7b 59 return fResponse;
60}
61
2e5f0f7b 62void AliRICHChamber::ResponseModel(AliRICHResponse* thisResponse)
63{
237c933d 64// Configure response model
2e5f0f7b 65 fResponse=thisResponse;
66}
67
68void AliRICHChamber::Init()
69{
237c933d 70// Initialise chambers
2e5f0f7b 71 fSegmentation->Init(this);
72}
73
74void AliRICHChamber::LocaltoGlobal(Float_t pos[3],Float_t Globalpos[3])
75{
76
237c933d 77// Local coordinates to global coordinates transformation
78
2e5f0f7b 79 Double_t *fMatrix;
80 fMatrix = fChamberMatrix->GetMatrix();
81 Globalpos[0]=pos[0]*fMatrix[0]+pos[1]*fMatrix[3]+pos[2]*fMatrix[6];
82 Globalpos[1]=pos[0]*fMatrix[1]+pos[1]*fMatrix[4]+pos[2]*fMatrix[7];
83 Globalpos[2]=pos[0]*fMatrix[2]+pos[1]*fMatrix[5]+pos[2]*fMatrix[8];
84 Globalpos[0]+=fChamberTrans[0];
85 Globalpos[1]+=fChamberTrans[1];
86 Globalpos[2]+=fChamberTrans[2];
87}
88
89void AliRICHChamber::GlobaltoLocal(Float_t pos[3],Float_t Localpos[3])
90{
91
237c933d 92// Global coordinates to local coordinates transformation
93
2e5f0f7b 94 Double_t *fMatrixOrig;
95 TMatrix fMatrixCopy(3,3);
96 fMatrixOrig = fChamberMatrix->GetMatrix();
97 for(Int_t i=0;i<3;i++)
98 {
99 for(Int_t j=0;j<3;j++)
100 fMatrixCopy(j,i)=fMatrixOrig[j+3*i];
101 }
102 fMatrixCopy.Invert();
103 //Int_t elements=fMatrixCopy.GetNoElements();
104 //printf("Elements:%d\n",elements);
105 //fMatrixOrig= (Double_t*) fMatrixCopy;
106 Localpos[0] = pos[0] - fChamberTrans[0];
107 Localpos[1] = pos[1] - fChamberTrans[1];
108 Localpos[2] = pos[2] - fChamberTrans[2];
109 //printf("r1:%f, r2:%f, r3:%f\n",Localpos[0],Localpos[1],Localpos[2]);
110 //printf("t1:%f t2:%f t3:%f\n",fChamberTrans[0],fChamberTrans[1],fChamberTrans[2]);
111 Localpos[0]=Localpos[0]*fMatrixCopy(0,0)+Localpos[1]*fMatrixCopy(0,1)+Localpos[2]*fMatrixCopy(0,2);
112 Localpos[1]=Localpos[0]*fMatrixCopy(1,0)+Localpos[1]*fMatrixCopy(1,1)+Localpos[2]*fMatrixCopy(1,2);
113 Localpos[2]=Localpos[0]*fMatrixCopy(2,0)+Localpos[1]*fMatrixCopy(2,1)+Localpos[2]*fMatrixCopy(2,2);
114 //Localpos[0]-=fChamberTrans[0];
115 //Localpos[1]-=fChamberTrans[1];
116 //Localpos[2]-=fChamberTrans[2];
117}
118
119
120void AliRICHChamber::DisIntegration(Float_t eloss, Float_t xhit, Float_t yhit,
237c933d 121 Int_t& nnew,Float_t newclust[6][500],ResponseType res)
2e5f0f7b 122{
123//
124// Generates pad hits (simulated cluster)
125// using the segmentation and the response model
126
127 Float_t dx, dy;
128 Float_t local[3];
129 //Float_t source[3];
130 Float_t global[3];
131 //
132 // Width of the integration area
133 //
134 dx=(fResponse->SigmaIntegration())*(fResponse->ChargeSpreadX());
135 dy=(fResponse->SigmaIntegration())*(fResponse->ChargeSpreadY());
136 //
137 // Get pulse height from energy loss and generate feedback photons
138 Float_t qtot=0;
139
140 local[0]=xhit;
141 // z-position of the wires relative to the RICH mother volume
142 // (2 mmm before CsI) old value: 6.076
64cdfc12 143 local[1]=1.276 + fGeometry->GetGapThickness()/2 - .2;
2e5f0f7b 144 //printf("AliRICHChamber feedback origin:%f",local[1]);
145 local[2]=yhit;
146
147 LocaltoGlobal(local,global);
148
237c933d 149 Int_t nFp=0;
2e5f0f7b 150
237c933d 151 if (res==kMip) {
2e5f0f7b 152 qtot = fResponse->IntPH(eloss);
237c933d 153 nFp = fResponse->FeedBackPhotons(global,qtot);
154 } else if (res==kCerenkov) {
2e5f0f7b 155 qtot = fResponse->IntPH();
237c933d 156 nFp = fResponse->FeedBackPhotons(global,qtot);
2e5f0f7b 157 }
158
237c933d 159 //printf("Feedbacks:%d\n",nFp);
2e5f0f7b 160
161 //
162 // Loop Over Pads
163
164 Float_t qcheck=0, qp=0;
165
166 nnew=0;
167 for (Int_t i=1; i<=fnsec; i++) {
168 qcheck=0;
169 for (fSegmentation->FirstPad(xhit, yhit, dx, dy);
170 fSegmentation->MorePads();
171 fSegmentation->NextPad())
172 {
173 qp= fResponse->IntXY(fSegmentation);
174 qp= TMath::Abs(qp);
175
176 //printf("Qp:%f\n",qp);
177
178 if (qp > 1.e-4) {
179 qcheck+=qp;
180 //
181 // --- store signal information
182 newclust[0][nnew]=qtot;
183 newclust[1][nnew]=fSegmentation->Ix();
184 newclust[2][nnew]=fSegmentation->Iy();
185 newclust[3][nnew]=qp * qtot;
186 newclust[4][nnew]=fSegmentation->ISector();
187 newclust[5][nnew]=(Float_t) i;
188 nnew++;
189 //printf("Newcluster:%d\n",i);
190 }
191 } // Pad loop
192 } // Cathode plane loop
193 //if (fSegmentation->ISector()==2)
194 //printf("Nnew:%d\n\n\n\n",nnew);
195}
196
197
237c933d 198AliRICHChamber& AliRICHChamber::operator=(const AliRICHChamber& rhs)
199{
200// Assignment operator
201 return *this;
202
203}
2e5f0f7b 204
205