4 #include "AliRICHConst.h"
10 class AliRICHParam :public TObject
14 virtual ~AliRICHParam() {;}
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;}
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;}
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 §or);
66 inline static Double_t Loc2PadFrac(TVector3 locX3,Int_t padx,Int_t pady);
68 inline void SigGenInit(Double_t x,Double_t y);
69 inline Bool_t SigGenCond(Double_t x,Double_t y);
70 inline static Int_t Loc2Sec(Double_t &x,Double_t &y);
71 inline static Int_t Pad2Sec(Int_t &padx,Int_t &pady);
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
78 ClassDef(AliRICHParam,4) //RICH main parameters
80 //__________________________________________________________________________________________________
81 Int_t AliRICHParam::PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4])
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++;}
90 //__________________________________________________________________________________________________
91 Int_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.
94 Double_t x1=-0.5*PcSizeX(); Double_t x2=-0.5*SectorSizeX()-DeadZone(); Double_t x3=-0.5*SectorSizeX();
95 Double_t x4= 0.5*SectorSizeX(); Double_t x5= 0.5*SectorSizeX()+DeadZone(); Double_t x6= 0.5*PcSizeX();
97 if (x>=x1&&x<=x2) {sector=1;x+=0.5*PcSizeX();}
98 else if(x>=x3&&x<=x4) {sector=2;x+=0.5*SectorSizeX();}
99 else if(x>=x5&&x<=x6) {sector=3;x-=0.5*SectorSizeX()+DeadZone();}
100 else if(x< x1||x> x6) {return kBad;}
101 else {return kBad;} //in dead zone
103 if (y>=-0.5*PcSizeY() &&y<=-0.5*DeadZone()) {y+=0.5*PcSizeY(); return -sector;}
104 else if(y> -0.5*DeadZone() &&y< 0.5*DeadZone()) {return kBad;} //in dead zone
105 else if(y>= 0.5*DeadZone() &&y<= 0.5*PcSizeY()) {y-=0.5*DeadZone(); return sector;}
107 }//Loc2Sec(Double_t x, Double_t y)
108 //__________________________________________________________________________________________________
109 Int_t AliRICHParam::Pad2Sec(Int_t &padx, Int_t &pady)
110 {//Determines sector for a given pad (padx,pady) and trasform this point to the local system of that sector.
112 if (padx>=1 &&padx<=NpadsXsec()) {sector=1;}
113 else if(padx> NpadsXsec() &&padx<=NpadsXsec()*2) {sector=2;padx-=NpadsXsec();}
114 else if(padx> NpadsXsec()*2&&padx<=NpadsX()) {sector=3;padx-=NpadsXsec()*2;}
117 if (pady>=1 &&pady<= NpadsYsec()) {return -sector;}
118 else if(pady>NpadsYsec()&&pady<= NpadsY()) {pady-=NpadsYsec();return sector;}
121 //__________________________________________________________________________________________________
122 Int_t AliRICHParam::Loc2Pad(Double_t x, Double_t y, Int_t &padx, Int_t &pady)
123 {//returns pad numbers (iPadX,iPadY) for given point in local coordinates (x,y)
124 //count starts in lower left corner from 1,1 to 144,180
127 Int_t sector=Loc2Sec(x,y);
128 if(sector==kBad) return sector;
130 padx=Int_t(x/PadSizeX())+1;
131 if(padx>NpadsXsec()) padx= NpadsXsec();
132 if(sector==2||sector==-2) padx+=NpadsXsec();
133 else if(sector==3||sector==-3) padx+=NpadsXsec()*2;
135 pady=Int_t(y/PadSizeY())+1;
136 if(pady>NpadsYsec()) padx= NpadsYsec();
137 if(sector>0) pady+=NpadsYsec();
141 //__________________________________________________________________________________________________
142 void AliRICHParam::Pad2Loc(Int_t padx,Int_t pady,Double_t &x,Double_t &y)
144 Int_t sector=Pad2Sec(padx,pady);
146 y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY();
149 y=-0.5*PcSizeY()+pady*PadSizeY()-0.5*PadSizeY();
152 x=-0.5*PcSizeX()+padx*PadSizeX()-0.5*PadSizeX();
154 x=-0.5*SectorSizeX()+padx*PadSizeX()-0.5*PadSizeX();
156 x= 0.5*SectorSizeX()+DeadZone()+padx*PadSizeX()-0.5*PadSizeX();
159 //__________________________________________________________________________________________________
160 Double_t AliRICHParam::GainVariation(Double_t y,Int_t sector)
163 if(y>0) y-=SectorSizeY()/2; else y+=SectorSizeY()/2;
167 return 9e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0316*TMath::Power(y,2)-3e-4*y+25.367;//%
172 //__________________________________________________________________________________________________
173 Int_t AliRICHParam::Loc2TotQdc(TVector3 x3,Double_t eloss,Int_t iPid,Int_t §or)
174 {//calculates the total charge produced by the hit given in local refenrence system
175 Double_t x=x3.X(),y=x3.Y();
179 Double_t gain=QdcSlope(sector)*(1+GainVariation(x3.Y(),sector)/100);
182 if(iPid>50000){//it's photon => 1 electron
183 return Int_t(gain*-TMath::Log(gRandom->Rndm()));
185 Int_t iNelectrons=Int_t(eloss/IonisationPotential());
186 if(iNelectrons==0) return 0;
188 for(Int_t i=1;i<=iNelectrons;i++) qdc+=gain*-TMath::Log(gRandom->Rndm());
192 //__________________________________________________________________________________________________
193 Double_t AliRICHParam::Loc2PadFrac(TVector3 hitX3,Int_t padx,Int_t pady)
195 Double_t padXcenter=0,padYcenter=0; Pad2Loc(padx,pady,padXcenter,padYcenter);
197 //correction to the position of the nearest wire
199 Double_t normXmin=(hitX3.X()-padXcenter-PadSizeX()/2) /AnodeCathodeGap();
200 Double_t normXmax=(hitX3.X()-padXcenter+PadSizeX()/2) /AnodeCathodeGap();
201 Double_t normYmin=(hitX3.Y()-padYcenter-PadSizeY()/2) /AnodeCathodeGap();
202 Double_t normYmax=(hitX3.Y()-padYcenter+PadSizeY()/2) /AnodeCathodeGap();
204 return Mathienson(normXmin,normYmin,normXmax,normYmax);
206 //__________________________________________________________________________________________________
207 Double_t AliRICHParam::Mathienson(Double_t xMin,Double_t yMin,Double_t xMax,Double_t yMax)
208 {//see NIM A370(1988)602-603
209 const Double_t SqrtKx3=0.77459667;const Double_t Kx2=0.962;const Double_t Kx4=0.379;
210 const Double_t SqrtKy3=0.77459667;const Double_t Ky2=0.962;const Double_t Ky4=0.379;
212 Double_t ux1=SqrtKx3*TMath::TanH(Kx2*xMin);
213 Double_t ux2=SqrtKx3*TMath::TanH(Kx2*xMax);
214 Double_t uy1=SqrtKy3*TMath::TanH(Ky2*yMin);
215 Double_t uy2=SqrtKy3*TMath::TanH(Ky2*yMax);
216 return 4*Kx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*Ky4*(TMath::ATan(uy2)-TMath::ATan(uy1));
218 //__________________________________________________________________________________________________
219 void AliRICHParam::Loc2Area(TVector3 hitX3,Int_t &iPadXmin,Int_t &iPadYmin,Int_t &iPadXmax,Int_t &iPadYmax)
220 {//calculates the area of disintegration for a given hit. Area is a rectangulare set pf pads
221 //defined by its left-down and right-up coners
222 // hitX3.SetX(Shift2NearestWire(hitX3.X());
223 Loc2Pad(hitX3.X()-MathiensonDeltaX(),hitX3.X()-MathiensonDeltaY(),iPadXmin,iPadYmin);
224 Loc2Pad(hitX3.X()+MathiensonDeltaX(),hitX3.X()+MathiensonDeltaY(),iPadXmax,iPadYmax);
226 #endif //AliRICHParam_h