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d48cca74 1#ifndef AliRICHParam_h
2#define AliRICHParam_h
3
d48cca74 4#include "AliRICHConst.h"
c712cb2f 5#include <TObject.h>
6#include <TMath.h>
7#include <TVector3.h>
8#include <TRandom.h>
9e23b054 9
d48cca74 10class AliRICHParam :public TObject
11{
12public:
c712cb2f 13 AliRICHParam() {;}
853634d3 14 virtual ~AliRICHParam() {;}
c712cb2f 15 static Int_t NpadsX() {return 144;}
16 static Int_t NpadsY() {return 160;}
17 static Int_t NpadsXsec() {return NpadsX()/3;}
18 static Int_t NpadsYsec() {return NpadsY()/2;}
19 static Double_t DeadZone() {return 2.6;}
20 static Double_t PadSizeX() {return 0.84;}
21 static Double_t PadSizeY() {return 0.8;}
22 static Double_t SectorSizeX() {return NpadsX()*PadSizeX()/3;}
23 static Double_t SectorSizeY() {return NpadsY()*PadSizeY()/2;}
24 static Double_t PcSizeX() {return NpadsX()*PadSizeX()+2*DeadZone();}
25 static Double_t PcSizeY() {return NpadsY()*PadSizeY()+DeadZone();}
26 static Double_t WirePitch() {return PadSizeX()/2;}
27 static Double_t SizeX() {return 132.6;}
28 static Double_t SizeY() {return 26;}
29 static Double_t SizeZ() {return 136.7;}
30 static Double_t Offset() {return 490+1.267;}
31 static Double_t AngleYZ() {return 19.5*TMath::DegToRad();}
32 static Double_t AngleXY() {return 20*TMath::DegToRad();}
33 static Double_t FreonThickness() {return 1.5;}
34 static Double_t QuartzThickness() {return 0.5;}
35 static Double_t GapThickness() {return 8.0;}
36 static Double_t RadiatorToPads() {return FreonThickness()+QuartzThickness()+GapThickness();}
37 static Double_t ProximityGapThickness() {return 0.4;}
38 static Double_t AnodeCathodeGap() {return 0.2;}
39 static Double_t QuartzLength() {return 133;}
40 static Double_t QuartzWidth() {return 127.9;}
41 static Double_t OuterFreonLength() {return 133;}
42 static Double_t OuterFreonWidth() {return 41.3;}
43 static Double_t InnerFreonLength() {return 133;}
44 static Double_t InnerFreonWidth() {return 41.3;}
45 static Double_t IonisationPotential() {return 26.0e-9;}
46 static Double_t MathiensonDeltaX() {return 5*0.18;}
47 static Double_t MathiensonDeltaY() {return 5*0.18;}
48 static Int_t MaxQdc() {return 4095;}
49 static Double_t QdcSlope(Int_t sec) {HV(sec);return 27;}
50 static Double_t AlphaFeedback(Int_t sec) {HV(sec);return 0.036;}
853634d3 51
c712cb2f 52 static Bool_t IsWireSag() {return fgIsWireSag;}
53 static Int_t HV(Int_t) {return fgHV;}
54 static Double_t AngleRot() {return fgAngleRot*TMath::DegToRad();}
55 static void SetWireSag(Bool_t status) {fgIsWireSag=status;}
56 static void SetHV(Int_t hv) {fgHV =hv;}
57 static void SetAngleRot(Double_t rot) {fgAngleRot =rot;}
58
59 inline static Double_t Mathienson(Double_t lx1,Double_t lx2,Double_t ly1,Double_t ly2);
60 inline static void Loc2Area(TVector3 hitX3,Int_t &padxMin,Int_t &padyMin,Int_t &padxMax,Int_t &padyMax);
61 inline static Int_t PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t aListX[4],Int_t aListY[4]);
62 inline static Int_t Loc2Pad(Double_t x,Double_t y,Int_t &padx,Int_t &pady);
63 inline static void Pad2Loc(Int_t padx,Int_t pady,Double_t &x,Double_t &y);
64 inline static Double_t GainVariation(Double_t y,Int_t sector);
65 inline static Int_t Loc2TotQdc(TVector3 locX3,Double_t eloss,Int_t iPid, Int_t &sector);
66 inline static Double_t Loc2PadFrac(TVector3 locX3,Int_t padx,Int_t pady);
543d5224 67
6a005d35 68 void SigGenInit(Double_t,Double_t){;}
69 Bool_t SigGenCond(Double_t,Double_t){return kFALSE;}
c712cb2f 70 inline static Int_t Loc2Sec(Double_t &x,Double_t &y);
71 inline static Int_t Pad2Sec(Int_t &padx,Int_t &pady);
cbaf35fb 72 inline static Bool_t IsResolveClusters() {return kTRUE;}
d48cca74 73protected:
c712cb2f 74 static Bool_t fgIsWireSag; //is wire sagitta taken into account
75 static Int_t fgHV; //HV applied to anod wires
76 static Double_t fgAngleRot; //rotation of RICH from up postion (0,0,490)cm
d48cca74 77
c712cb2f 78 ClassDef(AliRICHParam,4) //RICH main parameters
d48cca74 79};
c2c6679b 80//__________________________________________________________________________________________________
c712cb2f 81Int_t AliRICHParam::PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4])
82{
83 Int_t nPads=0;
84 if(iPadY<NpadsY()){listX[nPads]=iPadX; listY[nPads]=iPadY+1; nPads++;}
85 if(iPadX<NpadsX()){listX[nPads]=iPadX+1; listY[nPads]=iPadY; nPads++;}
86 if(iPadY>1) {listX[nPads]=iPadX; listY[nPads]=iPadY-1; nPads++;}
87 if(iPadX>1) {listX[nPads]=iPadX-1; listY[nPads]=iPadY; nPads++;}
88 return nPads;
89}//Pad2ClosePads()
90//__________________________________________________________________________________________________
91Int_t AliRICHParam::Loc2Sec(Double_t &x,Double_t &y)
92{//Determines sector for a given hit (x,y) and trasform this point to the local system of that sector.
93 Int_t sector=kBad;
6a005d35 94 Double_t x1=-PcSizeX()/2; Double_t x2=-SectorSizeX()/2-DeadZone(); Double_t x3=-SectorSizeX()/2;
95 Double_t x4= SectorSizeX()/2; Double_t x5= SectorSizeX()/2+DeadZone(); Double_t x6= PcSizeX()/2;
c712cb2f 96
6a005d35 97 if (x>=x1&&x<=x2) {sector=1;x+=PcSizeX()/2;}
98 else if(x>=x3&&x<=x4) {sector=2;x+=SectorSizeX()/2;}
99 else if(x>=x5&&x<=x6) {sector=3;x-=SectorSizeX()/2+DeadZone();}
100 else {return kBad;} //in dead zone
c712cb2f 101
c1863e3c 102 if (y>=-PcSizeY()/2 &&y<=-DeadZone()/2) {y+=PcSizeY()/2; return sector;}
6a005d35 103 else if(y> -DeadZone()/2 &&y< DeadZone()/2) {return kBad;} //in dead zone
c1863e3c 104 else if(y>= DeadZone()/2 &&y<= PcSizeY()/2) {y-=DeadZone()/2; return sector+3;}
6a005d35 105 else {return kBad;}
c712cb2f 106}//Loc2Sec(Double_t x, Double_t y)
c2c6679b 107//__________________________________________________________________________________________________
c712cb2f 108Int_t AliRICHParam::Pad2Sec(Int_t &padx, Int_t &pady)
109{//Determines sector for a given pad (padx,pady) and trasform this point to the local system of that sector.
110 Int_t sector=kBad;
111 if (padx>=1 &&padx<=NpadsXsec()) {sector=1;}
112 else if(padx> NpadsXsec() &&padx<=NpadsXsec()*2) {sector=2;padx-=NpadsXsec();}
113 else if(padx> NpadsXsec()*2&&padx<=NpadsX()) {sector=3;padx-=NpadsXsec()*2;}
114 else {return kBad;}
115
c1863e3c 116 if (pady>=1 &&pady<= NpadsYsec()) {return sector;}
117 else if(pady>NpadsYsec()&&pady<= NpadsY()) {pady-=NpadsYsec();return sector+3;}
c712cb2f 118 else {return kBad;}
119}//Pad2Sec()
120//__________________________________________________________________________________________________
121Int_t AliRICHParam::Loc2Pad(Double_t x, Double_t y, Int_t &padx, Int_t &pady)
122{//returns pad numbers (iPadX,iPadY) for given point in local coordinates (x,y)
123 //count starts in lower left corner from 1,1 to 144,180
124
125 padx=pady=kBad;
126 Int_t sector=Loc2Sec(x,y);
127 if(sector==kBad) return sector;
128
129 padx=Int_t(x/PadSizeX())+1;
130 if(padx>NpadsXsec()) padx= NpadsXsec();
c1863e3c 131 if(sector==2||sector==5) padx+=NpadsXsec();
132 else if(sector==3||sector==6) padx+=NpadsXsec()*2;
c712cb2f 133
134 pady=Int_t(y/PadSizeY())+1;
135 if(pady>NpadsYsec()) padx= NpadsYsec();
136 if(sector>0) pady+=NpadsYsec();
137
138 return sector;
139}//Loc2Pad()
140//__________________________________________________________________________________________________
141void AliRICHParam::Pad2Loc(Int_t padx,Int_t pady,Double_t &x,Double_t &y)
142{
143 Int_t sector=Pad2Sec(padx,pady);
c1863e3c 144 if(sector>3)
c712cb2f 145 y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY();
146 else{
c712cb2f 147 y=-0.5*PcSizeY()+pady*PadSizeY()-0.5*PadSizeY();
148 }
c1863e3c 149 if(sector==1||sector==4)
c712cb2f 150 x=-0.5*PcSizeX()+padx*PadSizeX()-0.5*PadSizeX();
c1863e3c 151 else if(sector==2||sector==5)
c712cb2f 152 x=-0.5*SectorSizeX()+padx*PadSizeX()-0.5*PadSizeX();
c2c6679b 153 else
c712cb2f 154 x= 0.5*SectorSizeX()+DeadZone()+padx*PadSizeX()-0.5*PadSizeX();
155 return;
156}//Pad2Loc()
c60862bf 157//__________________________________________________________________________________________________
c712cb2f 158Double_t AliRICHParam::GainVariation(Double_t y,Int_t sector)
c60862bf 159{
c712cb2f 160 if(IsWireSag()){
161 if(y>0) y-=SectorSizeY()/2; else y+=SectorSizeY()/2;
162 switch(HV(sector)){
163 case 2150:
164 default:
165 return 9e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0316*TMath::Power(y,2)-3e-4*y+25.367;//%
166 }
167 }else
168 return 0;
169}
170//__________________________________________________________________________________________________
171Int_t AliRICHParam::Loc2TotQdc(TVector3 x3,Double_t eloss,Int_t iPid,Int_t &sector)
172{//calculates the total charge produced by the hit given in local refenrence system
173 Double_t x=x3.X(),y=x3.Y();
174
175 sector=Loc2Sec(x,y);
176
177 Double_t gain=QdcSlope(sector)*(1+GainVariation(x3.Y(),sector)/100);
178
179
180 if(iPid>50000){//it's photon => 1 electron
181 return Int_t(gain*-TMath::Log(gRandom->Rndm()));
182 }else{//it's MIP
183 Int_t iNelectrons=Int_t(eloss/IonisationPotential());
184 if(iNelectrons==0) return 0;
185 Double_t qdc=0;
186 for(Int_t i=1;i<=iNelectrons;i++) qdc+=gain*-TMath::Log(gRandom->Rndm());
187 return Int_t(qdc);
188 }
543d5224 189}
c2c6679b 190//__________________________________________________________________________________________________
c712cb2f 191Double_t AliRICHParam::Loc2PadFrac(TVector3 hitX3,Int_t padx,Int_t pady)
192{//
193 Double_t padXcenter=0,padYcenter=0; Pad2Loc(padx,pady,padXcenter,padYcenter);
194
195 //correction to the position of the nearest wire
196
197 Double_t normXmin=(hitX3.X()-padXcenter-PadSizeX()/2) /AnodeCathodeGap();
198 Double_t normXmax=(hitX3.X()-padXcenter+PadSizeX()/2) /AnodeCathodeGap();
199 Double_t normYmin=(hitX3.Y()-padYcenter-PadSizeY()/2) /AnodeCathodeGap();
200 Double_t normYmax=(hitX3.Y()-padYcenter+PadSizeY()/2) /AnodeCathodeGap();
201
202 return Mathienson(normXmin,normYmin,normXmax,normYmax);
203}//Loc2PadQdc()
204//__________________________________________________________________________________________________
205Double_t AliRICHParam::Mathienson(Double_t xMin,Double_t yMin,Double_t xMax,Double_t yMax)
206{//see NIM A370(1988)602-603
207 const Double_t SqrtKx3=0.77459667;const Double_t Kx2=0.962;const Double_t Kx4=0.379;
208 const Double_t SqrtKy3=0.77459667;const Double_t Ky2=0.962;const Double_t Ky4=0.379;
209
210 Double_t ux1=SqrtKx3*TMath::TanH(Kx2*xMin);
211 Double_t ux2=SqrtKx3*TMath::TanH(Kx2*xMax);
212 Double_t uy1=SqrtKy3*TMath::TanH(Ky2*yMin);
213 Double_t uy2=SqrtKy3*TMath::TanH(Ky2*yMax);
214 return 4*Kx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*Ky4*(TMath::ATan(uy2)-TMath::ATan(uy1));
215}
216//__________________________________________________________________________________________________
217void AliRICHParam::Loc2Area(TVector3 hitX3,Int_t &iPadXmin,Int_t &iPadYmin,Int_t &iPadXmax,Int_t &iPadYmax)
218{//calculates the area of disintegration for a given hit. Area is a rectangulare set pf pads
219 //defined by its left-down and right-up coners
220 // hitX3.SetX(Shift2NearestWire(hitX3.X());
6a005d35 221 Loc2Pad(hitX3.X()-MathiensonDeltaX(),hitX3.Y()-MathiensonDeltaY(),iPadXmin,iPadYmin);
222 Loc2Pad(hitX3.X()+MathiensonDeltaX(),hitX3.Y()+MathiensonDeltaY(),iPadXmax,iPadYmax);
c712cb2f 223}//
d48cca74 224#endif //AliRICHParam_h