#include <TObject.h>
#include <TMath.h>
-#include <TVector3.h>
+#include <TVector2.h>
#include <TRandom.h>
+#include <TError.h>
static const int kNCH=7; //number of RICH chambers
static const int kNpadsX = 144; //number of pads along X in single chamber
static const int kNpadsY = 160; //number of pads along Y in single chamber
static const int kBad=-101; //useful static const to mark initial (uninitalised) values
-
+static const int kNsectors=6; // nb. of sectors per chamber
static const int kadc_satm = 4096; //dynamic range (10 bits)
static const int kCerenkov=50000050; //??? go to something more general like TPDGCode
public:
AliRICHParam() {;}
virtual ~AliRICHParam() {;}
- static const Int_t NpadsX() {return kNpadsX;}
- static const Int_t NpadsY() {return kNpadsY;}
- 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 const Int_t NpadsX() {return kNpadsX;} //pads along X in chamber
+ static const Int_t NpadsY() {return kNpadsY;} //pads along Y in chamber
+ static Int_t NpadsXsec() {return NpadsX()/3;} //pads along X in sector
+ static Int_t NpadsYsec() {return NpadsY()/2;} //pads along Y in sector
+ static Double_t DeadZone() {return 2.6;} //dead zone size in cm
+ static Double_t PadSizeX() {return 0.84;} //pad size x in cm
+ static Double_t PadSizeY() {return 0.8;} //pad size y in cm
+ static Double_t SectorSizeX() {return NpadsX()*PadSizeX()/3;} //sector size x in cm
+ static Double_t SectorSizeY() {return NpadsY()*PadSizeY()/2;} //sector size y in cm
+ static Double_t PcSizeX() {return NpadsX()*PadSizeX()+2*DeadZone();} //photocathode size x in cm
+ static Double_t PcSizeY() {return NpadsY()*PadSizeY()+DeadZone();} //photocathode size y in cm
+ static Double_t WirePitch() {return PadSizeX()/2;} //distance between anode wires
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 SizeZ() {return 136.7;}
+ static Double_t Offset() {return 490+1.267;} //distance from IP to center of chamber in cm
+ static Double_t AngleYZ() {return 19.5*TMath::DegToRad();} //angle between chambers in YZ plane, rad
+ static Double_t AngleXY() {return 20*TMath::DegToRad();} //angle between chambers in XY plane, rad
+ static Double_t AngleRot() {return fgAngleRot*TMath::DegToRad();} //RICH rotation around Z, rad
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 ProximityGap() {return 0.445;}
static Double_t AnodeCathodeGap() {return 0.2;}
static Double_t QuartzLength() {return 133;}
static Double_t QuartzWidth() {return 127.9;}
static Double_t InnerFreonLength() {return 133;}
static Double_t InnerFreonWidth() {return 41.3;}
static Double_t IonisationPotential() {return 26.0e-9;}
- static Double_t MathiesonDeltaX() {return 5*0.18;}
- static Double_t MathiesonDeltaY() {return 5*0.18;}
+ static TVector2 MathiesonDelta() {return TVector2(5*0.18,5*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;}
- static Bool_t IsResolveClusters() {return fgIsResolveClusters;}
- static Bool_t IsWireSag() {return fgIsWireSag;}
- static Int_t HV(Int_t) {return fgHV;}
- static Double_t AngleRot() {return fgAngleRot*TMath::DegToRad();}
- static void SetResolveClusters(Bool_t a){fgIsResolveClusters=a;}
- static void SetWireSag(Bool_t status) {fgIsWireSag=status;}
- static void SetHV(Int_t hv) {fgHV =hv;}
- static void SetAngleRot(Double_t rot) {fgAngleRot =rot;}
+ static Bool_t IsResolveClusters() {return fgIsResolveClusters;} //go after resolved clusters?
+ static Bool_t IsWireSag() {return fgIsWireSag;} //take wire sagita in account?
+ static Int_t HV(Int_t sector) {
+ if (sector>=1 && sector <=6)
+ return fgHV[sector-1];
+ else {
+ ::Error("HV","Wrong sector %d",sector);
+ return kBad;
+ }
+ } //high voltage for this sector
+ static void IsResolveClusters(Bool_t a) {fgIsResolveClusters=a;}
+ static void SetWireSag(Bool_t status) {fgIsWireSag=status;}
+ static void SetHV(Int_t sector,Int_t hv){fgHV[sector-1]=hv;}
+ static void SetAngleRot(Double_t rot) {fgAngleRot =rot;}
- inline static Double_t Mathieson(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);
+ inline static void Loc2Area(TVector2 x2,Int_t &padxMin,Int_t &padyMin,Int_t &padxMax,Int_t &padyMax); //
+ inline static Int_t Loc2Pad(TVector2 x2,Int_t &padx,Int_t &pady); //return sector and pad
+ inline static TVector2 Pad2Loc(Int_t padx,Int_t pady); //return center of the pad
+ static Int_t Sector(Int_t padx,Int_t pady) {return Pad2Sec(padx,pady);} //sector of this pad
+ static Int_t Sector(TVector2 x2) {int x,y;return Loc2Pad(x2,x,y);} //sector of this point
+ inline static Int_t PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t aListX[4],Int_t aListY[4]); //number of neighbours for this pad
+ inline static TVector2 ShiftToWirePos(TVector2 x2); //shift to the nearest wire
- 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 Sector(Int_t padx,Int_t pady) {return Pad2Sec(padx,pady);}
- inline Bool_t IsOverTh(Int_t iChamber, Int_t x, Int_t y, Double_t q);
- static Int_t NsigmaTh() {return fgNsigmaTh;}
- static Float_t SigmaThMean() {return fgSigmaThMean;}
- static Float_t SigmaThSpread() {return fgSigmaThSpread;}
- void GenSigmaThMap();
+ inline static Double_t Mathieson(Double_t lx1,Double_t lx2,Double_t ly1,Double_t ly2); //Mathienson integral over these limits
+ inline static Double_t GainSag(Double_t y,Int_t sector); //gain variations in %
+ inline static Double_t QdcSlope(Int_t sec); //weight of electon in QDC channels
+ inline static Double_t Gain(TVector2 x2); //gain for point in ChRS
+ inline static Double_t FracQdc(TVector2 x2,Int_t padx,Int_t pady); //charge fraction to pad from hit
+ inline static Int_t TotQdc(TVector2 x2,Double_t eloss); //total charge for hit eloss=0 for photons
+ inline Bool_t IsOverTh(Int_t iChamber, Int_t x, Int_t y, Double_t q); //
+ static Int_t NsigmaTh() {return fgNsigmaTh;} //
+ static Float_t SigmaThMean() {return fgSigmaThMean;} //
+ static Float_t SigmaThSpread() {return fgSigmaThSpread;} //
+ void GenSigmaThMap(); //generate pedestal map
+ static void Print();
protected:
- static Bool_t fgIsWireSag; //is wire sagitta taken into account
- static Bool_t fgIsResolveClusters; //performs declustering or not
- static Int_t fgHV; //HV applied to anod wires
- static Double_t fgAngleRot; //rotation of RICH from up postion (0,0,490)cm
- static Float_t fSigmaThMap[kNCH][kNpadsX][kNpadsY]; // sigma of the pedestal distributions for all pads
- static Int_t fgNsigmaTh; // n. of sigmas to cut for zero suppression
- static Float_t fgSigmaThMean; // sigma threshold value
- static Float_t fgSigmaThSpread; // spread of sigma
+ inline static Int_t Loc2Sec(TVector2 &x2); //return sector, x2->Sector RS
+ inline static Int_t Pad2Sec(Int_t &padx,Int_t &pady); //return sector, (padx,pady)->Sector RS
+ static Bool_t fgIsWireSag; //is wire sagitta taken into account
+ static Bool_t fgIsResolveClusters; //performs declustering or not
+ static Int_t fgHV[6]; //HV applied to anod wires
+ static Double_t fgAngleRot; //rotation of RICH from up postion (0,0,490)cm
+ static Float_t fSigmaThMap[kNCH][kNpadsX][kNpadsY]; //sigma of the pedestal distributions for all pads
+ static Int_t fgNsigmaTh; //n. of sigmas to cut for zero suppression
+ static Float_t fgSigmaThMean; //sigma threshold value
+ static Float_t fgSigmaThSpread; //spread of sigma
ClassDef(AliRICHParam,4) //RICH main parameters
};
//__________________________________________________________________________________________________
Int_t AliRICHParam::PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4])
{
+// Determines all the neighbouring pads for the given one. Returns total amount of these pads.
+// Dead zones are taken into account.
Int_t nPads=0;
if(iPadY!=NpadsY()&&iPadY!=NpadsYsec()) {listX[nPads]=iPadX; listY[nPads]=iPadY+1; nPads++;}
if(iPadX!=NpadsXsec()&&iPadX!=2*NpadsXsec()&&iPadX!=NpadsX()){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 AliRICHParam::Loc2Sec(TVector2 &x2)
+{
+// Determines sector containing the given point and trasform this point to the local system of that sector.
+// Returns sector code: 1 2 3
+// 4 5 6
Int_t sector=kBad;
- Double_t x1=-PcSizeX()/2; Double_t x2=-SectorSizeX()/2-DeadZone(); Double_t x3=-SectorSizeX()/2;
- Double_t x4= SectorSizeX()/2; Double_t x5= SectorSizeX()/2+DeadZone(); Double_t x6= PcSizeX()/2;
-
- if (x>=x1&&x<=x2) {sector=1;x+=PcSizeX()/2;}
- else if(x>=x3&&x<=x4) {sector=2;x+=SectorSizeX()/2;}
- else if(x>=x5&&x<=x6) {sector=3;x-=SectorSizeX()/2+DeadZone();}
- else {return kBad;} //in dead zone
-
- if (y>=-PcSizeY()/2 &&y<=-DeadZone()/2) {y+=PcSizeY()/2; return sector;}
- else if(y> -DeadZone()/2 &&y< DeadZone()/2) {return kBad;} //in dead zone
- else if(y>= DeadZone()/2 &&y<= PcSizeY()/2) {y-=DeadZone()/2; return sector+3;}
- else {return kBad;}
+ Double_t p1=-0.5*PcSizeX(); Double_t p2=-0.5*SectorSizeX()-DeadZone(); Double_t p3=-0.5*SectorSizeX();
+ Double_t p4= 0.5*SectorSizeX(); Double_t p5= 0.5*SectorSizeX()+DeadZone(); Double_t p6= 0.5*PcSizeX();
+ Double_t x,y;
+ if (x2.X()>=p1&&x2.X()<=p2) {sector=1;x=x2.X()+0.5*PcSizeX();}
+ else if(x2.X()>=p3&&x2.X()<=p4) {sector=2;x=x2.X()+0.5*SectorSizeX();}
+ else if(x2.X()>=p5&&x2.X()<=p6) {sector=3;x=x2.X()-0.5*SectorSizeX()-DeadZone();}
+ else {return kBad;} //in dead zone or out of chamber
+
+ if (x2.Y()>=-0.5*PcSizeY() &&x2.Y()<=-0.5*DeadZone()) {y=x2.Y()+0.5*PcSizeY();sector+=3;} //sectors 4,5,6
+ else if(x2.Y()> -0.5*DeadZone()&&x2.Y()< 0.5*DeadZone()) {return kBad;} //in dead zone
+ else if(x2.Y()>= 0.5*DeadZone()&&x2.Y()<= 0.5*PcSizeY()) {y=x2.Y()-0.5*DeadZone();} //sectors 1,2,3
+ else {return kBad;} //out of chamber
+ x2.Set(x,y);
+ return sector;
}//Loc2Sec(Double_t x, Double_t y)
//__________________________________________________________________________________________________
+Int_t AliRICHParam::Loc2Pad(TVector2 x2,Int_t &padx,Int_t &pady)
+{
+// Determines pad number (padx,pady) containing the given point x2 defined the chamber RS.
+// Pad count starts in lower left corner from 1,1 to 144,160 in upper right corner of a chamber.
+// Returns sector number of the determined pad.
+ Int_t sector=Loc2Sec(x2);//trasforms x2 to sector reference system
+ if(sector==kBad) {padx=pady=kBad; return sector;}
+
+ padx=Int_t(x2.X()/PadSizeX())+1; if(padx>NpadsXsec()) padx= NpadsXsec();
+ if(sector==2||sector==5) padx+= NpadsXsec(); // 1 2 3
+ if(sector==3||sector==6) padx+=2*NpadsXsec(); // 4 5 6
+
+ pady=Int_t(x2.Y()/PadSizeY())+1; if(pady>NpadsYsec()) pady= NpadsYsec();
+ if(sector<4) pady+=NpadsYsec();
+ return sector;
+}
+//__________________________________________________________________________________________________
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.
+{
+// Determines sector containing the given pad (padx,pady) and trasform it to the local RS 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+3;}
- else {return kBad;}
+ if (pady>=1 &&pady<=NpadsYsec()) {return sector+3;}
+ 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==5) padx+=NpadsXsec();
- else if(sector==3||sector==6) 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)
+TVector2 AliRICHParam::Pad2Loc(Int_t padx,Int_t pady)
{
- Int_t sector=Pad2Sec(padx,pady);
- if(sector>3)
- y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY();
- else{
+// Returns position of the center of the given pad (padx,pady) in local RS of the chamber
+ Int_t sector=Pad2Sec(padx,pady);//shifts to sector RS
+ if(sector==kBad) return TVector2(-101,-101);
+ Double_t x,y;
+ if(sector<=3)
+ y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY(); // 1 2 3
+ else{ // 4 5 6
y=-0.5*PcSizeY()+pady*PadSizeY()-0.5*PadSizeY();
}
if(sector==1||sector==4)
x=-0.5*SectorSizeX()+padx*PadSizeX()-0.5*PadSizeX();
else
x= 0.5*SectorSizeX()+DeadZone()+padx*PadSizeX()-0.5*PadSizeX();
- return;
-}//Pad2Loc()
+ return TVector2(x,y);
+}
//__________________________________________________________________________________________________
-Double_t AliRICHParam::GainVariation(Double_t y,Int_t sector)
+Double_t AliRICHParam::GainSag(Double_t y,Int_t sector)
{
-//returns % of gain degradation due to wire sagita
- if(IsWireSag()){
- if(y>0) y-=SectorSizeY()/2; else y+=SectorSizeY()/2;
- switch(HV(sector)){
- case 2150: return 9e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0316*TMath::Power(y,2)-3e-4*y+25.367;//%
- case 2100: return 8e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0283*TMath::Power(y,2)-2e-4*y+23.015;
- case 2050: return 7e-6*TMath::Power(y,4)+1e-7*TMath::Power(y,3)-0.0254*TMath::Power(y,2)-2e-4*y+20.888;
- case 2000: return 6e-6*TMath::Power(y,4)+8e-8*TMath::Power(y,3)-0.0227*TMath::Power(y,2)-1e-4*y+18.961;
- default: return 0;
- }
- }else
- return 0;
+// Returns % of gain variation due to wire sagita.
+// All cureves are parametrized per sector basis, so y must be scaled to the Sector RS.
+ if(y>0) y-=SectorSizeY()/2; else y+=SectorSizeY()/2;
+ switch(HV(sector)){
+ case 2150: return 9e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0316*TMath::Power(y,2)-3e-4*y+25.367;//%
+ case 2100: return 8e-6*TMath::Power(y,4)+2e-7*TMath::Power(y,3)-0.0283*TMath::Power(y,2)-2e-4*y+23.015;
+ case 2050: return 7e-6*TMath::Power(y,4)+1e-7*TMath::Power(y,3)-0.0254*TMath::Power(y,2)-2e-4*y+20.888;
+ case 2000: return 6e-6*TMath::Power(y,4)+8e-8*TMath::Power(y,3)-0.0227*TMath::Power(y,2)-1e-4*y+18.961;
+ default: 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::QdcSlope(Int_t sec)
+{
+// Returns number of QDC channels per single electron at the unknown yet ???? point for a given sector
+ switch(sec){
+ case kBad: return 0;
+ default: return 27;
}
}
//__________________________________________________________________________________________________
-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();
+Double_t AliRICHParam::Gain(TVector2 x2)
+{
+//
+ if(IsWireSag())
+ return QdcSlope(Sector(x2))*(1+GainSag(x2.Y(),Sector(x2))/100);
+ else
+ return QdcSlope(Sector(x2));
+}
+//__________________________________________________________________________________________________
+Int_t AliRICHParam::TotQdc(TVector2 x2,Double_t eloss)
+{
+// Calculates the total charge produced by the eloss in point x2 (Chamber RS).
+// Returns this change parametrised in QDC channels.
+// eloss=0 means photons which provided for only 1 electron
+// eloss > 0 for Mip
+ if(Sector(x2)==kBad) return 0; //hit in the dead zone
+ Int_t iNelectrons=Int_t(eloss/IonisationPotential()); if(iNelectrons==0) iNelectrons=1;
+ Double_t qdc=0;
+ for(Int_t i=1;i<=iNelectrons;i++) qdc+=-Gain(x2)*TMath::Log(gRandom->Rndm());
+ return Int_t(qdc);
+}
+//__________________________________________________________________________________________________
+Double_t AliRICHParam::FracQdc(TVector2 x2,Int_t padx,Int_t pady)
+{
+// Calculates the charge fraction for a given pad (padx,pady) from the given hit point.
+// Mathieson distribution integrated is used.
+ TVector2 center2=Pad2Loc(padx,pady);//gives center of requested pad
+ Double_t normXmin=(x2.X()-center2.X()-PadSizeX()/2) /AnodeCathodeGap();
+ Double_t normXmax=(x2.X()-center2.X()+PadSizeX()/2) /AnodeCathodeGap();
+ Double_t normYmin=(x2.Y()-center2.Y()-PadSizeY()/2) /AnodeCathodeGap();
+ Double_t normYmax=(x2.Y()-center2.Y()+PadSizeY()/2) /AnodeCathodeGap();
- return Mathieson(normXmin,normYmin,normXmax,normYmax);
-}//Loc2PadQdc()
+ if(Sector(x2)!=Sector(padx,pady)) return 0;//requested pad does not belong to the sector of given point
+ else return Mathieson(normXmin, normYmin, normXmax, normYmax);
+}
//__________________________________________________________________________________________________
Double_t AliRICHParam::Mathieson(Double_t xMin,Double_t yMin,Double_t xMax,Double_t yMax)
-{//see NIM A370(1988)602-603
+{
+// All arguments are parametrised according to NIM A370(1988)602-603
+// Returns a charge fraction.
const Double_t kSqrtKx3=0.77459667;const Double_t kX2=0.962;const Double_t kX4=0.379;
const Double_t kSqrtKy3=0.77459667;const Double_t kY2=0.962;const Double_t kY4=0.379;
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()-MathiesonDeltaX(),hitX3.Y()-MathiesonDeltaY(),iPadXmin,iPadYmin);
- Loc2Pad(hitX3.X()+MathiesonDeltaX(),hitX3.Y()+MathiesonDeltaY(),iPadXmax,iPadYmax);
-}//
+void AliRICHParam::Loc2Area(TVector2 x2,Int_t &iPadXmin,Int_t &iPadYmin,Int_t &iPadXmax,Int_t &iPadYmax)
+{
+// Calculates the area of disintegration for a given point. It's assumed here that this points lays on anode wire.
+// Area is a rectangulare set of pads defined by its left-down and right-up coners.
+ Loc2Pad(x2-MathiesonDelta(),iPadXmin,iPadYmin);
+ Loc2Pad(x2+MathiesonDelta(),iPadXmax,iPadYmax);
+}
//__________________________________________________________________________________________________
-Bool_t AliRICHParam::IsOverTh(Int_t iChamber, Int_t x, Int_t y, Double_t q)
-{// Calculate the new charge subtracting pedestal and if the current digit is over threshold
- if(q>NsigmaTh()*fSigmaThMap[iChamber-1][x-1][y-1]) return kTRUE; else return kFALSE;
-}//
+Bool_t AliRICHParam::IsOverTh(Int_t c,Int_t x,Int_t y,Double_t q)
+{
+// Calculate the new charge subtracting pedestal and if the current digit is over threshold
+ if(q>NsigmaTh()*fSigmaThMap[c-1][x-1][y-1]) return kTRUE; else return kFALSE;
+}
+//__________________________________________________________________________________________________
+TVector2 AliRICHParam::ShiftToWirePos(TVector2 x2)
+{
+// Calculate the position of the wire nearest to the hit
+ Int_t padx,pady;
+ Loc2Pad(x2,padx,pady);
+ Double_t x;
+ TVector2 center2=Pad2Loc(padx,pady);
+ if(x2.X()>center2.X()) x=center2.X()+0.5*WirePitch();
+ else x=center2.X()-0.5*WirePitch();
+ x2.Set(x,x2.Y());
+ return x2;
+}
#endif //AliRICHParam_h
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