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 **************************************************************************/
16 #include <Riostream.h>
20 #include "AliRICHParam.h"
22 ClassImp(AliRICHParam)
24 Float_t AliRICHParam::fgAngleRot=-60;
26 // RICH main parameters manipulator
27 //__________________________________________________________________________________________________
28 AliRICHParam::AliRICHParam():
29 fCurrentPadX(0),fCurrentPadY(0),fCurrentWire(0),
31 fProximityGapThickness(0),
47 {//defines the default parameters
48 Size (132.6*kcm,26*kcm,136.7*kcm); //full length, not GEANT half notation
50 ProximityGapThickness(0.4*kcm);
51 QuartzLength (133*kcm);
52 QuartzWidth (127.9*kcm);
53 OuterFreonLength (133*kcm);
54 OuterFreonWidth (41.3*kcm);
55 InnerFreonLength (133*kcm);
56 InnerFreonWidth (41.3*kcm);
59 ChargeSpreadX(0.18);ChargeSpreadY(0.18);
64 WireSag(1); // 1->On, 0->Off
65 Voltage(2150); // Should only be 2000, 2050, 2100 or 2150
66 }//AliRICHParam::named ctor
67 //__________________________________________________________________________________________________
68 Int_t AliRICHParam::Local2Sector(Float_t &x, Float_t &y)
69 {//Determines sector for a given hit (x,y) and trasform this point to the local system of that sector.
71 Float_t x1=-0.5*PcSizeX(); Float_t x2=-0.5*SectorSizeX()-DeadZone(); Float_t x3=-0.5*SectorSizeX();
72 Float_t x4= 0.5*SectorSizeX(); Float_t x5= 0.5*SectorSizeX()+DeadZone(); Float_t x6= 0.5*PcSizeX();
74 if (x>=x1&&x<=x2) {sector=1;x+=0.5*PcSizeX();}
75 else if(x>=x3&&x<=x4) {sector=2;x+=0.5*SectorSizeX();}
76 else if(x>=x5&&x<=x6) {sector=3;x-=0.5*SectorSizeX()+DeadZone();}
77 else if(x< x1||x> x6) {return kBad;}
78 else {return kBad;} //in dead zone
80 if (y>=-0.5*PcSizeY() &&y<=-0.5*DeadZone()) {y+=0.5*PcSizeY(); return -sector;}
81 else if(y> -0.5*DeadZone() &&y< 0.5*DeadZone()) {return kBad;} //in dead zone
82 else if(y>= 0.5*DeadZone() &&y<= 0.5*PcSizeY()) {y-=0.5*DeadZone(); return sector;}
84 }//Int_t AliRICHParam::Local2Sector(Float_t x, Float_t y)
85 //__________________________________________________________________________________________________
86 Int_t AliRICHParam::Pad2Sector(Int_t &padx, Int_t &pady)
87 {//Determines sector for a given pad (padx,pady) and trasform this point to the local system of that sector.
89 if (padx>=1 &&padx<=NpadsXsec()) {sector=1;}
90 else if(padx> NpadsXsec() &&padx<=NpadsXsec()*2) {sector=2;padx-=NpadsXsec();}
91 else if(padx> NpadsXsec()*2&&padx<=NpadsX()) {sector=3;padx-=NpadsXsec()*2;}
94 if (pady>=1 &&pady<= NpadsYsec()) {return -sector;}
95 else if(pady>NpadsYsec()&&pady<= NpadsY()) {pady-=NpadsYsec();return sector;}
98 //__________________________________________________________________________________________________
99 Int_t AliRICHParam::Local2Pad(Float_t x, Float_t y, Int_t &padx, Int_t &pady)
100 {//returns pad numbers (iPadX,iPadY) for given point in local coordinates (x,y)
101 //count starts in lower left corner from 1,1 to 144,180
104 Int_t sector=Local2Sector(x,y);
105 if(sector==kBad) return sector;
107 padx=Int_t(x/PadSizeX())+1;
108 if(padx>NpadsXsec()) padx= NpadsXsec();
109 if(sector==2||sector==-2) padx+=NpadsXsec();
110 else if(sector==3||sector==-3) padx+=NpadsXsec()*2;
112 pady=Int_t(y/PadSizeY())+1;
113 if(pady>NpadsYsec()) padx= NpadsYsec();
114 if(sector>0) pady+=NpadsYsec();
118 //__________________________________________________________________________________________________
119 void AliRICHParam::Pad2Local(Int_t padx,Int_t pady,Float_t &x,Float_t &y)
121 Int_t sector=Pad2Sector(padx,pady);
123 y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY();
126 y=-0.5*PcSizeY()+pady*PadSizeY()-0.5*PadSizeY();
129 x=-0.5*PcSizeX()+padx*PadSizeX()-0.5*PadSizeX();
131 x=-0.5*SectorSizeX()+padx*PadSizeX()-0.5*PadSizeX();
133 x= 0.5*SectorSizeX()+DeadZone()+padx*PadSizeX()-0.5*PadSizeX();
136 //__________________________________________________________________________________________________
137 Float_t AliRICHParam::Gain(Float_t y)
138 {//Calculates the gain
140 Float_t gainK=9e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0316*TMath::Power(y,2)-3e-4*y+25.367;
141 Float_t gain = (ChargeSlope()+ChargeSlope()*gainK/100)*0.9;
142 return -gain*TMath::Log(gRandom->Rndm());
144 return -ChargeSlope()*TMath::Log(gRandom->Rndm());
145 }//Float_t AliRICHParam::IntPH(Float_t yhit)
146 //__________________________________________________________________________________________________
147 Float_t AliRICHParam::TotalCharge(Int_t iPID,Float_t eloss,Float_t y)
148 {//Get number of electrons and return charge
150 if(iPID>50000)//it's photon no more then 1 electron after photoelectron conversion
153 Int_t iNelectrons=Int_t(eloss/fEIonisation);if(iNelectrons==0) iNelectrons=1;
155 for(Int_t i=1;i<=iNelectrons;i++)
159 }//Float_t AliRICHParam::TotalCharge(Int_t iPID,Float_t eloss, Float_t y)
160 //__________________________________________________________________________________________________
161 void AliRICHParam::FirstPad(Float_t x,Float_t y)
164 Local2Pad(x,y,padx,pady);
165 }//void AliRICHParam::FirstPad(Float_t x,Float_t y)
166 //__________________________________________________________________________________________________
167 Float_t AliRICHParam::AssignChargeToPad(Float_t hitx,Float_t hity,Int_t padx,Int_t pady)
169 Float_t padXcenter=0,padYcenter=0;
170 Pad2Local(padx,pady,padXcenter,padYcenter);
172 Float_t xi1=hitx-padXcenter-PadSizeX()/2;
173 Float_t xi2=hitx-padXcenter+PadSizeX()/2;
174 Float_t yi1=hity-padYcenter-PadSizeY()/2;
175 Float_t yi2=hity-padYcenter+PadSizeY()/2;
176 xi1/=AnodeCathodeGap();
177 xi2/=AnodeCathodeGap();
178 yi1/=AnodeCathodeGap();
179 yi2/=AnodeCathodeGap();
180 // The Mathieson function
181 Double_t ux1=SqrtKx3()*TMath::TanH(Kx2()*xi1);
182 Double_t ux2=SqrtKx3()*TMath::TanH(Kx2()*xi2);
183 Double_t uy1=SqrtKy3()*TMath::TanH(Ky2()*yi1);
184 Double_t uy2=SqrtKy3()*TMath::TanH(Ky2()*yi2);
185 return 4.*Kx4()*(TMath::ATan(ux2)-TMath::ATan(ux1))*Ky4()*(TMath::ATan(uy2)-TMath::ATan(uy1));
186 }//AssignChargeToPad()
187 //__________________________________________________________________________________________________