#ifndef AliRICHParam_h
#define AliRICHParam_h
-#include <TObject.h>
#include "AliRICHConst.h"
-
-
+#include <TObject.h>
+#include <TMath.h>
+#include <TVector3.h>
+#include <TRandom.h>
class AliRICHParam :public TObject
{
public:
- AliRICHParam();
+ AliRICHParam() {;}
virtual ~AliRICHParam() {;}
+ static Int_t NpadsX() {return 144;}
+ static Int_t NpadsY() {return 160;}
+ static Int_t NpadsXsec() {return NpadsX()/3;}
+ static Int_t NpadsYsec() {return NpadsY()/2;}
+ static Double_t DeadZone() {return 2.6;}
+ static Double_t PadSizeX() {return 0.84;}
+ static Double_t PadSizeY() {return 0.8;}
+ static Double_t SectorSizeX() {return NpadsX()*PadSizeX()/3;}
+ static Double_t SectorSizeY() {return NpadsY()*PadSizeY()/2;}
+ static Double_t PcSizeX() {return NpadsX()*PadSizeX()+2*DeadZone();}
+ static Double_t PcSizeY() {return NpadsY()*PadSizeY()+DeadZone();}
+ static Double_t WirePitch() {return PadSizeX()/2;}
+ static Double_t SizeX() {return 132.6;}
+ static Double_t SizeY() {return 26;}
+ static Double_t SizeZ() {return 136.7;}
+ static Double_t Offset() {return 490+1.267;}
+ static Double_t AngleYZ() {return 19.5*TMath::DegToRad();}
+ static Double_t AngleXY() {return 20*TMath::DegToRad();}
+ static Double_t FreonThickness() {return 1.5;}
+ static Double_t QuartzThickness() {return 0.5;}
+ static Double_t GapThickness() {return 8.0;}
+ static Double_t RadiatorToPads() {return FreonThickness()+QuartzThickness()+GapThickness();}
+ static Double_t ProximityGapThickness() {return 0.4;}
+ static Double_t AnodeCathodeGap() {return 0.2;}
+ static Double_t QuartzLength() {return 133;}
+ static Double_t QuartzWidth() {return 127.9;}
+ static Double_t OuterFreonLength() {return 133;}
+ static Double_t OuterFreonWidth() {return 41.3;}
+ static Double_t InnerFreonLength() {return 133;}
+ static Double_t InnerFreonWidth() {return 41.3;}
+ static Double_t IonisationPotential() {return 26.0e-9;}
+ static Double_t MathiensonDeltaX() {return 5*0.18;}
+ static Double_t MathiensonDeltaY() {return 5*0.18;}
+ static Int_t MaxQdc() {return 4095;}
+ static Double_t QdcSlope(Int_t sec) {HV(sec);return 27;}
+ static Double_t AlphaFeedback(Int_t sec) {HV(sec);return 0.036;}
- inline Int_t Neighbours(Int_t iPadX,Int_t iPadY,Int_t aListX[4],Int_t aListY[4])const; //pad->neibours
- inline void SigGenInit(Float_t x,Float_t y);
- inline Bool_t SigGenCond(Float_t x,Float_t y);
- static Int_t Local2Pad(Float_t x,Float_t y,Int_t &padx,Int_t &pady); //(x,y)->(padx,pady), returns sector code
- static Int_t Local2PadX(Float_t x,Float_t y) {Int_t padx,pady;Local2Pad(x,y,padx,pady);return padx;}//(x,y)->padx
- static Int_t Local2PadY(Float_t x,Float_t y) {Int_t padx,pady;Local2Pad(x,y,padx,pady);return pady;}//(x,y)->pady
- static void Pad2Local(Int_t padx,Int_t pady,Float_t &x,Float_t &y); //(padx,pady)->(x,y)
- static Int_t LocalX2Wire(Float_t x) {return Int_t((x+PcSizeX()/2)/WirePitch())+1;} //x->wire number
- static Float_t Wire2LocalX(Int_t iWireN) {return iWireN*WirePitch()-PcSizeX()/2;} //wire number->x
+ static Bool_t IsWireSag() {return fgIsWireSag;}
+ static Int_t HV(Int_t) {return fgHV;}
+ static Double_t AngleRot() {return fgAngleRot*TMath::DegToRad();}
+ static void SetWireSag(Bool_t status) {fgIsWireSag=status;}
+ static void SetHV(Int_t hv) {fgHV =hv;}
+ static void SetAngleRot(Double_t rot) {fgAngleRot =rot;}
+
+ inline static Double_t Mathienson(Double_t lx1,Double_t lx2,Double_t ly1,Double_t ly2);
+ inline static void Loc2Area(TVector3 hitX3,Int_t &padxMin,Int_t &padyMin,Int_t &padxMax,Int_t &padyMax);
+ inline static Int_t PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t aListX[4],Int_t aListY[4]);
+ inline static Int_t Loc2Pad(Double_t x,Double_t y,Int_t &padx,Int_t &pady);
+ inline static void Pad2Loc(Int_t padx,Int_t pady,Double_t &x,Double_t &y);
+ inline static Double_t GainVariation(Double_t y,Int_t sector);
+ inline static Int_t Loc2TotQdc(TVector3 locX3,Double_t eloss,Int_t iPid, Int_t §or);
+ inline static Double_t Loc2PadFrac(TVector3 locX3,Int_t padx,Int_t pady);
- Float_t Gain(Float_t y); //Returns total charge induced by single photon
- Float_t TotalCharge(Int_t iPID,Float_t eloss,Float_t y); //Returns total charge induced by particle lost eloss GeV
- static Float_t AssignChargeToPad(Float_t hx,Float_t hy, Int_t px, Int_t py); //Returns charge assigned to given pad for a given hit
- void FirstPad(Float_t x,Float_t y);
-
- static Float_t AnodeCathodeGap() {return 0.2;}
+ inline void SigGenInit(Double_t x,Double_t y);
+ inline Bool_t SigGenCond(Double_t x,Double_t y);
+ inline static Int_t Loc2Sec(Double_t &x,Double_t &y);
+ inline static Int_t Pad2Sec(Int_t &padx,Int_t &pady);
- static Int_t NpadsX() {return 144;}
- static Int_t NpadsY() {return 160;}
- static Int_t NpadsXsec() {return NpadsX()/3;}
- static Int_t NpadsYsec() {return NpadsY()/2;}
- static Float_t DeadZone() {return 2.6;}
- static Float_t PadSizeX() {return 0.84;}
- static Float_t PadSizeY() {return 0.8;}
- static Float_t SectorSizeX() {return NpadsX()*PadSizeX()/3;}
- static Float_t SectorSizeY() {return NpadsY()*PadSizeY()/2;}
- static Float_t PcSizeX() {return NpadsX()*PadSizeX()+2*DeadZone();}
- static Float_t PcSizeY() {return NpadsY()*PadSizeY()+DeadZone();}
- static Float_t WirePitch() {return PadSizeX()/2;}
-
- void Size(Float_t x,Float_t y,Float_t z){fSizeX=x;fSizeY=y;fSizeZ=z;}
- void GeantSize(Float_t *pArr) const{pArr[0]=fSizeX/2;pArr[1]=fSizeY/2;pArr[2]=fSizeZ/2;}
- Float_t SizeX() const{return fSizeX;}
- Float_t SizeY() const{return fSizeY;}
- Float_t SizeZ() const{return fSizeZ;}
- static Float_t Offset() {return 490+1.267;}
- static Float_t AngleYZ() {return 19.5*TMath::DegToRad();}
- static Float_t AngleXY() {return 20*TMath::DegToRad();}
- static void AngleRot(Float_t angle) { fgAngleRot=angle;}
- static Float_t AngleRot() {return fgAngleRot*kD2r;}
- static Float_t GapThickness() {return 8.0;}
- void ProximityGapThickness(Float_t a) { fProximityGapThickness=a;}
- Float_t ProximityGapThickness() const{return fProximityGapThickness;}
- void QuartzLength(Float_t a) { fQuartzLength=a;}
- Float_t QuartzLength() const{return fQuartzLength;}
- void QuartzWidth(Float_t a) { fQuartzWidth=a;}
- Float_t QuartzWidth() const{return fQuartzWidth;}
- static Float_t QuartzThickness() {return 0.5;}
- void OuterFreonLength(Float_t a) { fOuterFreonLength=a;}
- Float_t OuterFreonLength() const{return fOuterFreonLength;}
- void OuterFreonWidth(Float_t a) { fOuterFreonWidth=a;}
- Float_t OuterFreonWidth() const{return fOuterFreonWidth;}
- void InnerFreonLength(Float_t a) { fInnerFreonLength=a;}
- Float_t InnerFreonLength() const{return fInnerFreonLength;}
- void InnerFreonWidth(Float_t a) { fInnerFreonWidth=a;}
- Float_t InnerFreonWidth() const{return fInnerFreonWidth;}
- static Float_t FreonThickness() {return 1.5;}
- static Float_t RadiatorToPads() {return FreonThickness()+QuartzThickness()+GapThickness();}
-
- void SigmaIntegration(Float_t a) { fSigmaIntegration=a;}
- Float_t SigmaIntegration() const{return fSigmaIntegration;}
- void ChargeSpreadX(Float_t a) { fChargeSpreadX=a;}
- Float_t ChargeSpreadX() const{return fChargeSpreadX;}
- void ChargeSpreadY(Float_t a) { fChargeSpreadY=a;}
- Float_t ChargeSpreadY() const{return fChargeSpreadY;}
- Float_t AreaX() const{return fSigmaIntegration*fChargeSpreadX;}
- Float_t AreaY() const{return fSigmaIntegration*fChargeSpreadY;}
- void ChargeSlope(Float_t a) { fChargeSlope=a;}
- Float_t ChargeSlope() {return fChargeSlope;}
- void MaxAdc(Int_t a) { fMaxAdc=a;}
- Int_t MaxAdc() const{return fMaxAdc;}
- void AlphaFeedback(Float_t a) { fAlphaFeedback=a;}
- Float_t AlphaFeedback() const{return fAlphaFeedback;}
- void EIonisation(Float_t a) { fEIonisation=a;}
- Float_t EIonisation() const{return fEIonisation;}
- static Float_t SqrtKx3() {return 0.77459667;}
- static Float_t Kx2() {return 0.962;}
- static Float_t Kx4() {return 0.379;}
- static Float_t SqrtKy3() {return 0.77459667;}
- static Float_t Ky2() {return 0.962;}
- static Float_t Ky4() {return 0.379;}
-
- void WireSag(Int_t a) { fWireSag=a;}
- void Voltage(Int_t a) { fVoltage=a;}
- Float_t Voltage() const{return fVoltage;}
protected:
- static Int_t Local2Sector(Float_t &x,Float_t &y); //(x,y)->sector
- static Int_t Pad2Sector(Int_t &padx,Int_t &pady); //(padx,pady)->sector
-
- Int_t fCurrentPadX,fCurrentPadY; //???
- Int_t fCurrentWire; //???
-
- Float_t fSizeX; Float_t fSizeY; Float_t fSizeZ; //chamber outer size, cm
- static Float_t fgAngleRot; //azimuthal rotation XY plane, deg
- Float_t fProximityGapThickness; //proximity gap thickness, cm
- Float_t fQuartzLength; Float_t fQuartzWidth; //quartz window size, cm
- Float_t fOuterFreonLength; Float_t fOuterFreonWidth; //freon box outer size, cm
- Float_t fInnerFreonLength; Float_t fInnerFreonWidth; //freon box inner size, cm
+ static Bool_t fgIsWireSag; //is wire sagitta taken into account
+ static Int_t fgHV; //HV applied to anod wires
+ static Double_t fgAngleRot; //rotation of RICH from up postion (0,0,490)cm
- Float_t fChargeSlope; //Slope of the charge distribution
- Float_t fChargeSpreadX; //Width of the charge distribution in x
- Float_t fChargeSpreadY; //Width of the charge distribution in y
- Float_t fSigmaIntegration; //Number of sigma's used for charge distribution
- Float_t fAlphaFeedback; //Feedback photons coefficient
- Float_t fEIonisation; //Mean ionisation energy
- Int_t fMaxAdc; //Maximum ADC channel
- Int_t fWireSag; //Flag to turn on/off (0/1) wire sag
- Int_t fVoltage; //Working voltage (2000, 2050, 2100, 2150)
-
- ClassDef(AliRICHParam,2) //RICH main parameters
+ ClassDef(AliRICHParam,4) //RICH main parameters
};
//__________________________________________________________________________________________________
-void AliRICHParam::SigGenInit(Float_t x,Float_t y)
-{//Initialises pad and wire position during stepping
- Local2Pad(x,y,fCurrentPadX,fCurrentPadY);
- fCurrentWire= (x>0) ? Int_t(x/WirePitch())+1 : Int_t(x/WirePitch())-1 ;
-}
+Int_t AliRICHParam::PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4])
+{
+ Int_t nPads=0;
+ if(iPadY<NpadsY()){listX[nPads]=iPadX; listY[nPads]=iPadY+1; nPads++;}
+ if(iPadX<NpadsX()){listX[nPads]=iPadX+1; listY[nPads]=iPadY; nPads++;}
+ if(iPadY>1) {listX[nPads]=iPadX; listY[nPads]=iPadY-1; nPads++;}
+ if(iPadX>1) {listX[nPads]=iPadX-1; listY[nPads]=iPadY; nPads++;}
+ return nPads;
+}//Pad2ClosePads()
+//__________________________________________________________________________________________________
+Int_t AliRICHParam::Loc2Sec(Double_t &x,Double_t &y)
+{//Determines sector for a given hit (x,y) and trasform this point to the local system of that sector.
+ Int_t sector=kBad;
+ Double_t x1=-0.5*PcSizeX(); Double_t x2=-0.5*SectorSizeX()-DeadZone(); Double_t x3=-0.5*SectorSizeX();
+ Double_t x4= 0.5*SectorSizeX(); Double_t x5= 0.5*SectorSizeX()+DeadZone(); Double_t x6= 0.5*PcSizeX();
+
+ if (x>=x1&&x<=x2) {sector=1;x+=0.5*PcSizeX();}
+ else if(x>=x3&&x<=x4) {sector=2;x+=0.5*SectorSizeX();}
+ else if(x>=x5&&x<=x6) {sector=3;x-=0.5*SectorSizeX()+DeadZone();}
+ else if(x< x1||x> x6) {return kBad;}
+ else {return kBad;} //in dead zone
+
+ if (y>=-0.5*PcSizeY() &&y<=-0.5*DeadZone()) {y+=0.5*PcSizeY(); return -sector;}
+ else if(y> -0.5*DeadZone() &&y< 0.5*DeadZone()) {return kBad;} //in dead zone
+ else if(y>= 0.5*DeadZone() &&y<= 0.5*PcSizeY()) {y-=0.5*DeadZone(); return sector;}
+ else {return kBad;}
+}//Loc2Sec(Double_t x, Double_t y)
//__________________________________________________________________________________________________
-Bool_t AliRICHParam::SigGenCond(Float_t x,Float_t y)
-{//Signal will be generated if particle crosses pad boundary or boundary between two wires.
- Int_t curPadX,curPadY;
- Local2Pad(x,y,curPadX,curPadY);
- Int_t currentWire=(x>0) ? Int_t(x/WirePitch())+1 : Int_t(x/WirePitch())-1;
- if((curPadX != fCurrentPadX) || (curPadY != fCurrentPadY) || (currentWire!=fCurrentWire))
- return kTRUE;
+Int_t AliRICHParam::Pad2Sec(Int_t &padx, Int_t &pady)
+{//Determines sector for a given pad (padx,pady) and trasform this point to the local system of that sector.
+ Int_t sector=kBad;
+ if (padx>=1 &&padx<=NpadsXsec()) {sector=1;}
+ else if(padx> NpadsXsec() &&padx<=NpadsXsec()*2) {sector=2;padx-=NpadsXsec();}
+ else if(padx> NpadsXsec()*2&&padx<=NpadsX()) {sector=3;padx-=NpadsXsec()*2;}
+ else {return kBad;}
+
+ if (pady>=1 &&pady<= NpadsYsec()) {return -sector;}
+ else if(pady>NpadsYsec()&&pady<= NpadsY()) {pady-=NpadsYsec();return sector;}
+ else {return kBad;}
+}//Pad2Sec()
+//__________________________________________________________________________________________________
+Int_t AliRICHParam::Loc2Pad(Double_t x, Double_t y, Int_t &padx, Int_t &pady)
+{//returns pad numbers (iPadX,iPadY) for given point in local coordinates (x,y)
+ //count starts in lower left corner from 1,1 to 144,180
+
+ padx=pady=kBad;
+ Int_t sector=Loc2Sec(x,y);
+ if(sector==kBad) return sector;
+
+ padx=Int_t(x/PadSizeX())+1;
+ if(padx>NpadsXsec()) padx= NpadsXsec();
+ if(sector==2||sector==-2) padx+=NpadsXsec();
+ else if(sector==3||sector==-3) padx+=NpadsXsec()*2;
+
+ pady=Int_t(y/PadSizeY())+1;
+ if(pady>NpadsYsec()) padx= NpadsYsec();
+ if(sector>0) pady+=NpadsYsec();
+
+ return sector;
+}//Loc2Pad()
+//__________________________________________________________________________________________________
+void AliRICHParam::Pad2Loc(Int_t padx,Int_t pady,Double_t &x,Double_t &y)
+{
+ Int_t sector=Pad2Sec(padx,pady);
+ if(sector>0)
+ y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY();
+ else{
+ sector=-sector;
+ y=-0.5*PcSizeY()+pady*PadSizeY()-0.5*PadSizeY();
+ }
+ if(sector==1)
+ x=-0.5*PcSizeX()+padx*PadSizeX()-0.5*PadSizeX();
+ else if(sector==2)
+ x=-0.5*SectorSizeX()+padx*PadSizeX()-0.5*PadSizeX();
else
- return kFALSE;
-}//Bool_t AliRICHParam::SigGenCond(Float_t x,Float_t y)
+ x= 0.5*SectorSizeX()+DeadZone()+padx*PadSizeX()-0.5*PadSizeX();
+ return;
+}//Pad2Loc()
//__________________________________________________________________________________________________
-Int_t AliRICHParam::Neighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4])const
+Double_t AliRICHParam::GainVariation(Double_t y,Int_t sector)
{
- listX[0]=iPadX; listY[0]=iPadY-1;
- listX[1]=iPadX+1; listY[1]=iPadY;
- listX[2]=iPadX; listY[2]=iPadY+1;
- listX[3]=iPadX-1; listY[3]=iPadY;
- return 4;
+ if(IsWireSag()){
+ if(y>0) y-=SectorSizeY()/2; else y+=SectorSizeY()/2;
+ switch(HV(sector)){
+ case 2150:
+ default:
+ return 9e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0316*TMath::Power(y,2)-3e-4*y+25.367;//%
+ }
+ }else
+ return 0;
+}
+//__________________________________________________________________________________________________
+Int_t AliRICHParam::Loc2TotQdc(TVector3 x3,Double_t eloss,Int_t iPid,Int_t §or)
+{//calculates the total charge produced by the hit given in local refenrence system
+ Double_t x=x3.X(),y=x3.Y();
+
+ sector=Loc2Sec(x,y);
+
+ Double_t gain=QdcSlope(sector)*(1+GainVariation(x3.Y(),sector)/100);
+
+
+ if(iPid>50000){//it's photon => 1 electron
+ return Int_t(gain*-TMath::Log(gRandom->Rndm()));
+ }else{//it's MIP
+ Int_t iNelectrons=Int_t(eloss/IonisationPotential());
+ if(iNelectrons==0) return 0;
+ Double_t qdc=0;
+ for(Int_t i=1;i<=iNelectrons;i++) qdc+=gain*-TMath::Log(gRandom->Rndm());
+ return Int_t(qdc);
+ }
}
//__________________________________________________________________________________________________
+Double_t AliRICHParam::Loc2PadFrac(TVector3 hitX3,Int_t padx,Int_t pady)
+{//
+ Double_t padXcenter=0,padYcenter=0; Pad2Loc(padx,pady,padXcenter,padYcenter);
+
+ //correction to the position of the nearest wire
+
+ Double_t normXmin=(hitX3.X()-padXcenter-PadSizeX()/2) /AnodeCathodeGap();
+ Double_t normXmax=(hitX3.X()-padXcenter+PadSizeX()/2) /AnodeCathodeGap();
+ Double_t normYmin=(hitX3.Y()-padYcenter-PadSizeY()/2) /AnodeCathodeGap();
+ Double_t normYmax=(hitX3.Y()-padYcenter+PadSizeY()/2) /AnodeCathodeGap();
+
+ return Mathienson(normXmin,normYmin,normXmax,normYmax);
+}//Loc2PadQdc()
+//__________________________________________________________________________________________________
+Double_t AliRICHParam::Mathienson(Double_t xMin,Double_t yMin,Double_t xMax,Double_t yMax)
+{//see NIM A370(1988)602-603
+ const Double_t SqrtKx3=0.77459667;const Double_t Kx2=0.962;const Double_t Kx4=0.379;
+ const Double_t SqrtKy3=0.77459667;const Double_t Ky2=0.962;const Double_t Ky4=0.379;
+
+ Double_t ux1=SqrtKx3*TMath::TanH(Kx2*xMin);
+ Double_t ux2=SqrtKx3*TMath::TanH(Kx2*xMax);
+ Double_t uy1=SqrtKy3*TMath::TanH(Ky2*yMin);
+ Double_t uy2=SqrtKy3*TMath::TanH(Ky2*yMax);
+ return 4*Kx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*Ky4*(TMath::ATan(uy2)-TMath::ATan(uy1));
+}
+//__________________________________________________________________________________________________
+void AliRICHParam::Loc2Area(TVector3 hitX3,Int_t &iPadXmin,Int_t &iPadYmin,Int_t &iPadXmax,Int_t &iPadYmax)
+{//calculates the area of disintegration for a given hit. Area is a rectangulare set pf pads
+ //defined by its left-down and right-up coners
+ // hitX3.SetX(Shift2NearestWire(hitX3.X());
+ Loc2Pad(hitX3.X()-MathiensonDeltaX(),hitX3.X()-MathiensonDeltaY(),iPadXmin,iPadYmin);
+ Loc2Pad(hitX3.X()+MathiensonDeltaX(),hitX3.X()+MathiensonDeltaY(),iPadXmax,iPadYmax);
+}//
#endif //AliRICHParam_h
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