#ifndef AliRICHParam_h
#define AliRICHParam_h
-#include <TError.h>
-#include <TMath.h>
-#include <TObjArray.h>
-#include <TObject.h>
-#include <TMath.h>
-#include <TRandom.h>
-#include <TVector.h>
-#include <TVector2.h>
-#include <TVector3.h>
-#include <TRandom.h>
-#include <TError.h>
-#include <TObjArray.h>
-#include <AliLog.h>
-#include <TClass.h>
-
-static const int kNchambers=7; //number of RICH chambers
-static const int kNpadsX = 160; //number of pads along X in single chamber
-static const int kNpadsY = 144; //number of pads along Y in single chamber
-static const int kNsectors=6; //number of sectors per chamber
-
+#include <TNamed.h> //base class
+#include <TGeoManager.h> //Instance()
+#include <TVector3.h> //Lors2Mars() Mars2Lors()
+
static const int kCerenkov=50000050; //??? go to something more general like TPDGCode
static const int kFeedback=50000051; //??? go to something more general like TPDGCode
-class AliRICHChamber;
-
// Class providing all the needed parametrised information
// to construct the geometry, to define segmentation and to provide response model
// In future will also provide all the staff needed for alignment and calibration
-
-class AliRICHParam :public TObject
+class AliRICHParam :public TNamed
{
public:
//ctor&dtor
- AliRICHParam():TObject(),fpChambers(0) {CreateChambers();}
- virtual ~AliRICHParam() {delete fpChambers;}
-//test methodes
+ virtual ~AliRICHParam() {for(Int_t i=0;i<7;i++) delete fM[i]; delete fgInstance; fgInstance=0;}
void Print(Option_t *opt="") const; //print current parametrization
- void Test() {TestSeg();TestTrans();TestResp();} //test all groups of methodes
- void TestResp(); //test the response group of methodes
- void TestSeg(); //test the segmentation group of methodes
- void TestTrans(); //test the transform group of methodes
- static void DrawAxis();
- static void DrawSectors();
-//flags staff
- static void SetAerogel(Bool_t a) {fgIsAerogel=a;}
- static Bool_t IsAerogel() {return fgIsAerogel;}
- static void SetRadioSrc(Bool_t a) {fgIsRadioSrc=a;}
- static Bool_t IsRadioSrc() {return fgIsRadioSrc;}
- static void SetTestBeam(Bool_t a) {fgIsTestBeam=a;}
- static Bool_t IsTestBeam() {return fgIsTestBeam;}
- static void SetWireSag(Bool_t a) {fgIsWireSag=a;}
- static Bool_t IsWireSag() {return fgIsWireSag;}
- static void SetResolveClusters(Bool_t a) {fgIsResolveClusters=a;}
- static Bool_t IsResolveClusters() {return fgIsResolveClusters;}
-//Chambers manipulation methodes
- void CreateChambers(); //form chamber structure
- AliRICHChamber* C(Int_t i) {return (AliRICHChamber*)fpChambers->UncheckedAt(i-1);} //returns pointer to chamber i
- Int_t Nchambers() {return fpChambers->GetEntriesFast();} //returns number of chambers
-//Geometrical properties
- static Int_t NpadsX() {return kNpadsX;} //pads along X in chamber
- static Int_t NpadsY() {return kNpadsY;} //pads along Y in chamber
- static Int_t NpadsXsec() {return NpadsX()/2;} //pads along X in sector
- static Int_t NpadsYsec() {return NpadsY()/3;} //pads along Y in sector
- static Double_t DeadZone() {return 2.6;} //dead zone size in cm
- static Double_t SectorSizeX() {return NpadsX()*PadSizeX()/2;} //sector size x, cm
- static Double_t SectorSizeY() {return NpadsY()*PadSizeY()/3;} //sector size y, cm
- static Double_t PcSizeX() {return NpadsX()*PadSizeX()+DeadZone();} //PC size x, cm
- static Double_t PcSizeY() {return NpadsY()*PadSizeY()+2*DeadZone();} //PC size y, cm
- static Double_t Zfreon() {return 1.5;} //freon thinkness, cm
- static Double_t Zwin() {return 0.5;} //radiator quartz window, cm
- static Double_t Pc2Win() {return 8.0;} //cm between CsI PC and radiator quartz window
- static Double_t Pc2Coll() {return 7.0;} //cm between CsI PC and third wire grid (collection wires)
- static Double_t Pc2Anod() {return 0.204;} //cm between CsI PC and first wire grid (anod wires)
- static Double_t Pc2Cath() {return 0.445;} //cm between CsI PC and second wire grid (cathode wires)
- static Double_t Freon2Pc() {return Zfreon()+Zwin()+Pc2Win();} //cm between CsI PC and entrance to freon
- static Double_t PitchAnod() {return PadSizeY()/2;} //cm between anode wires
- static Double_t PitchCath() {return PadSizeY()/4;} //cm between cathode wires
- static Double_t PitchColl() {return 0.5;} //cm between collection wires
- static Double_t PadSizeX() {return 0.8;} //pad size x, cm
- static Double_t PadSizeY ( ){return 0.84;} //pad size y, cm
-//trasformation methodes
- static Int_t Pad2Cha (Int_t pad ){return pad/100000000; }//abs pad -> chamber
- static Int_t Pad2Sec (Int_t pad ){return pad%100000000/1000000; }//abs pad -> sector
- static Int_t Pad2PadX (Int_t pad ){return pad%1000000/1000; }//abs pad -> pad x
- static Int_t Pad2PadY (Int_t pad ){return pad%1000000%100; }//abs pad -> pad y
- static Int_t PadAbs (Int_t c,Int_t s,Int_t x,Int_t y){return 100000000*c+1000000*s+1000*x+y; }//(c,s,x,y) -> abs pad
- static inline TVector2 Pad2Loc (Int_t pad ); //abs pad ->LORS
- static inline TVector2 Pad2Loc (TVector pad ); //pad -> LORS returns center of the pad
- static TVector2 Pad2Loc (Int_t x,Int_t y ){TVector pad(2);pad[0]=x;pad[1]=y;return Pad2Loc(pad);}//return center of the pad (x,y)
- static inline TVector Loc2Area (const TVector2 &x2 ); //pads area affected by hit x2. area is LeftDown-RightUp pad numbers
- static inline Int_t Loc2Sec (const TVector2 &x2 ); //LORS -> sector
- static Int_t Loc2Sec (Double_t x,Double_t y ){return Loc2Sec(TVector2(x,y));} //LORS -> sector
- static inline TVector Loc2Pad (const TVector2 &x2 ); //LORS -> pad
- static TVector Loc2Pad (Double_t x,Double_t y ){return Loc2Pad(TVector2(x,y));} //LORS -> pad
- static inline Int_t Pad2Sec (const TVector &pad ); //pad -> sector
- static inline Int_t PadNeighbours (Int_t iPadX,Int_t iPadY,Int_t aListX[4],Int_t aListY[4]); //pad -> list of it neighbours
- static Bool_t IsAccepted (const TVector2 &x2 ){return ( x2.X()>=0 && x2.X()<=PcSizeX() && x2.Y()>=0 && x2.Y()<=PcSizeY() ) ? kTRUE:kFALSE;}
-//optical properties methodes
- static Double_t MeanCkovEnergy( ){return 6.766;} //mean Ckov energy according to the total trasmission curve
- static Float_t PhotonEnergy (Int_t i ){return 0.1*i+5.5;} //photon energy (eV) for i-th point
- static Float_t AbsCH4 (Float_t ev ); //CH4 abs len (cm)
- static Float_t AbsGel (Float_t ){return 500;} //Aerogel abs len (cm)
- static Float_t RefIdxC6F14 (Float_t eV ){return eV*0.0172+1.177;} //Freon ref idx
- static Float_t RefIdxCH4 (Float_t ){return 1.000444;} //Methane ref idx
- static Float_t RefIdxSiO2 (Float_t eV ){Float_t e1=10.666,e2=18.125,f1=46.411,f2= 228.71; return TMath::Sqrt(1.+f1/(e1*e1-eV*eV)+f2/(e2*e2-eV*eV));}//Quartz window ref index from TDR p.35
- static Float_t RefIdxGel (Float_t ){return 1.05;} //aerogel ref index
- static Float_t DenGel ( ){return (RefIdxGel(0)-1)/0.21;} //aerogel density gr/cm^3 parametrization by E.Nappi
-
-
- static Double_t IonisationPotential() {return 26.0e-9;} //for CH4 in GeV taken from ????
- static TVector2 MathiesonDelta() {return TVector2(5*0.18,5*0.18);} //area of 5 sigmas of Mathieson distribution (cm)
- static Int_t MaxQdc() {return 4095;} //QDC number of channels
+ static inline AliRICHParam* Instance(); //pointer to AliRICHParam singleton
- static Int_t HV(Int_t sector) {if (sector>=1 && sector <=6) return fgHV[sector-1]; else return -1;} //high voltage for this sector
- static void SetHV(Int_t sector,Int_t hv){fgHV[sector-1]=hv;}
-//charge response methodes
- inline static Double_t Mathieson(Double_t x1,Double_t x2,Double_t y1,Double_t y2); //Mathienson integral over given limits
- inline static Double_t GainSag(Double_t x,Int_t sector); //gain variations in %
- static Double_t QdcSlope(Int_t sec){switch(sec){case -1: return 0; default: return 33;}} //weight of electon in QDC channels
- static Double_t Gain(const TVector2 &x2){//gives chamber gain in terms of QDC channels for given point in local ref system
- if(fgIsWireSag) return QdcSlope(Loc2Sec(x2))*(1+GainSag(x2.X(),Loc2Sec(x2))/100);
- else return QdcSlope(Loc2Sec(x2));}
- inline static Double_t FracQdc(const TVector2 &x2,const TVector &pad); //charge fraction to pad from hit
- inline static Int_t TotQdc(TVector2 x2,Double_t eloss); //total charge for Eloss (GeV) 0 for photons
- inline static Bool_t IsOverTh(Int_t c,TVector pad,Double_t q); //is QDC of the pad registered by FEE
- static Int_t NsigmaTh() {return fgNsigmaTh;} //
- static Float_t SigmaThMean() {return fgSigmaThMean;} //QDC electronic noise mean
- static Float_t SigmaThSpread() {return fgSigmaThSpread;} //QDC electronic noise width
-
- static Double_t CogCorr(Double_t x) {return 3.31267e-2*TMath::Sin(2*TMath::Pi()/PadSizeX()*x) //correction of cluster CoG due to sinoidal
- -2.66575e-3*TMath::Sin(4*TMath::Pi()/PadSizeX()*x)
- +2.80553e-3*TMath::Sin(6*TMath::Pi()/PadSizeX()*x)+0.0070;}
- static void ReadErrFiles(); //Read Err file parameters
- static TVector3 SigmaSinglePhoton(Int_t Npart, Double_t mom, Double_t theta, Double_t phi); //Find Sigma for single photon
- static Double_t Interpolate(Double_t par[4][330],Double_t x, Double_t y, Double_t phi); //Find the error value from interpolation
-
- static TVector3 ForwardTracing(TVector3 entranceTrackPoint,TVector3 vectorTrack, Double_t thetaC, Double_t phiC); //it traces foward a photon from Emission Point to PC
- static TVector3 PlaneIntersect(TVector3 vstart,TVector3 p0,TVector3 n,TVector3 v0); //it finds intersection between straight track and plane
- static Double_t SnellAngle(Float_t n1, Float_t n2, Float_t theta1); // Snell law
- static void AnglesInDRS(Double_t trackTheta,Double_t trackPhi,Double_t thetaCerenkov,Double_t phiCerenkov,Double_t &tout,Double_t &pout);//It finds photon angles in
- //Detector Reference System
-
- static Bool_t fgIsAerogel; //aerogel geometry instead of normal RICH flag
+ Double_t MeanIdxRad () {return 1.29204;}//???????????
+ Double_t MeanIdxWin () {return 1.57819;}//???????????
+ static Int_t Stack(Int_t evt=-1,Int_t tid=-1); //Print stack info for event and tid
+ static Int_t StackCount(Int_t pid,Int_t evt); //Counts stack particles of given sort in given event
+//trasformation methodes
+ void Lors2Mars (Int_t c,Float_t x,Float_t y,Double_t *m,Int_t pl=kPc)const{Double_t z=0; switch(pl){case kPc:z=8.0;break; case kAnod:z=7.806;break; case kRad:z=-1.25; break;} Double_t l[3]={x-fX,y-fY,z}; fM[c]->LocalToMaster(l,m); }
+ TVector3 Lors2Mars (Int_t c,Float_t x,Float_t y, Int_t pl=kPc)const{Double_t m[3];Lors2Mars(c,x,y,m,pl); return TVector3(m); }//MRS->LRS
+ void Mars2Lors (Int_t c,Double_t *m,Float_t &x,Float_t &y )const{Double_t l[3];fM[c]->MasterToLocal(m,l);x=l[0]+fX;y=l[1]+fY;}//MRS->LRS
+ void Mars2LorsVec(Int_t c,Double_t *m,Float_t &th,Float_t &ph )const{Double_t l[3]; fM[c]->MasterToLocalVect(m,l); Float_t pt=TMath::Sqrt(l[0]*l[0]+l[1]*l[1]); th=TMath::ATan(l[3]/pt); ph=TMath::ATan(l[0]/pt);}
+ TVector3 Norm (Int_t c )const{Double_t n[3]; Norm(c,n); return TVector3(n); }//norm
+ void Norm (Int_t c,Double_t *n )const{Double_t l[3]={0,0,1};fM[c]->LocalToMasterVect(l,n); }//norm
+
+ enum EPlaneId {kPc,kRad,kAnod}; //3 planes in chamber
protected:
- static Bool_t fgIsRadioSrc; //radioactive source instead of radiators flag
- static Bool_t fgIsTestBeam; //test beam geometry instead of normal RICH flag
- static Bool_t fgIsWireSag; //wire sagitta ON/OFF flag
- static Bool_t fgIsResolveClusters; //declustering ON/OFF flag
- static Bool_t fgIsFeedback; //generate feedback photon?
-
- TObjArray *fpChambers; //list of chambers
- static Int_t fgHV[6]; //HV applied to anod wires
- 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
-
- static Double_t fgErrChrom[4][330]; //
- static Double_t fgErrGeom[4][330]; //
- static Double_t fgErrLoc[4][330]; //Chromatic, Geometric and Localization array to parametrize SigmaCerenkov
-
- ClassDef(AliRICHParam,6) //RICH main parameters class
+ AliRICHParam(); //default ctor is protected to enforce it to be singleton
+ static AliRICHParam *fgInstance; //static pointer to instance of AliRICHParam singleton
+ TGeoHMatrix *fM[7]; //poiners to matrices defining RICH chambers rotations-translations
+ Float_t fX; //x shift of LORS with respect to rotated MARS
+ Float_t fY; //y shift of LORS with respect to rotated MARS
+ ClassDef(AliRICHParam,0) //RICH main parameters class
};
-//__________________________________________________________________________________________________
-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 (iPadX,iPadY). Returns total number of these pads.
-//Dead zones are taken into account, meaning pads from different sector are not taken.
-// 1
-// 2 3
-// 4
- Int_t nPads=0;
- if(iPadY!=NpadsY()&&iPadY!=2*NpadsYsec()&&iPadY!=NpadsYsec()){listX[nPads]=iPadX; listY[nPads]=iPadY+1; nPads++;} //1
- if(iPadX!=1&&iPadX!=NpadsXsec()+1) {listX[nPads]=iPadX-1; listY[nPads]=iPadY; nPads++;} //2
- if(iPadX!=NpadsXsec()&&iPadX!=NpadsX()) {listX[nPads]=iPadX+1; listY[nPads]=iPadY; nPads++;} //3
- if(iPadY!=1&&iPadY!=NpadsYsec()+1&&2*NpadsYsec()+1) {listX[nPads]=iPadX; listY[nPads]=iPadY-1; nPads++;} //4
-
- return nPads;
-}//Pad2ClosePads()
-//__________________________________________________________________________________________________
-Int_t AliRICHParam::Loc2Sec(const TVector2 &v2)
-{
-//Determines sector containing the given point.
-//Returns sector code:
-//y ^ 5 6
-// | 3 4
-// | 1 2
-// -------> x
- Double_t x0=0; Double_t x1=SectorSizeX(); Double_t x2=SectorSizeX()+DeadZone(); Double_t x3=PcSizeX();
- Double_t y0=0; Double_t y1=SectorSizeY(); Double_t y2=SectorSizeY()+DeadZone(); Double_t y3=2*SectorSizeY()+DeadZone();
- Double_t y4=PcSizeY()-SectorSizeY(); Double_t y5=PcSizeY();
-
- Int_t sector=-1;
- if (v2.X() >= x0 && v2.X() <= x1 ) sector=1;
- else if(v2.X() >= x2 && v2.X() <= x3 ) sector=2;
- else return -1;
-
- if (v2.Y() >= y0 && v2.Y() <= y1 ) ; //sectors 1 or 2
- else if(v2.Y() >= y2 && v2.Y() <= y3 ) sector+=2; //sectors 3 or 4
- else if(v2.Y() >= y4 && v2.Y() <= y5 ) sector+=4; //sectors 5 or 6
- else return -1;
- return sector;
-}//Loc2Sec(Double_t x, Double_t y)
-//__________________________________________________________________________________________________
-TVector AliRICHParam::Loc2Pad(const TVector2 &loc)
-{
-//Determines pad number TVector(padx,pady) containing the given point x2 defined in the chamber RS.
-//Pad count starts in lower left corner from 1,1 to 144,160 in upper right corner of a chamber.
-//y ^ 5 6
-// | 3 4
-// | 1 2
-// -------> x
- TVector pad(2);
- Int_t sec=Loc2Sec(loc);//trasforms x2 to sector reference system
- if(sec==-1) {pad[0]=pad[1]=-1; return pad;}
-//first we deal with x
- if(sec==1||sec==3||sec==5) pad[0]= Int_t( loc.X() / PadSizeX() )+1; //sector 1 or 3 or 5
- else pad[0]=NpadsX() - Int_t( (PcSizeX()-loc.X()) / PadSizeX() ) ; //sector 2 or 4 or 6
-//second deal with y
- if(sec==1||sec==2) pad[1]=Int_t( loc.Y() / PadSizeY())+1; //sector 1 or 2
- else if(sec==3||sec==4) pad[1]=Int_t( (loc.Y()-SectorSizeY()-DeadZone()) / PadSizeY())+NpadsYsec()+1; //sector 3 or 4
- else pad[1]=NpadsY() - Int_t( (PcSizeY()-loc.Y()) / PadSizeY()); //sector 5 or 6
- return pad;
-}
-//__________________________________________________________________________________________________
-Int_t AliRICHParam::Pad2Sec(const TVector &pad)
-{
-//Determines sector containing the given pad.
- Int_t sector=-1;
- if (pad[0] >= 1 && pad[0] <= NpadsXsec() ) {sector=1;}
- else if(pad[0] > NpadsXsec() && pad[0] <= NpadsX() ) {sector=2;}
- else AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
-
- if (pad[1] >= 1 && pad[1] <= NpadsYsec() ) {}
- else if(pad[1] > NpadsYsec() && pad[1] <= 2*NpadsYsec() ) {sector+=2;}
- else if(pad[1] > 2*NpadsYsec() && pad[1] <= NpadsY() ) {sector+=4;}
- else AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
-
- return sector;
-}//Pad2Sec()
-//__________________________________________________________________________________________________
-TVector2 AliRICHParam::Pad2Loc(TVector pad)
-{
-//Returns position of the center of the given pad in local system of the chamber (cm)
-// y ^ 5 6
-// | 3 4 sector numbers
-// | 1 2
-// -------> x
- Double_t x=-1,y=-1;
- if(pad[0] > 0 && pad[0] <= NpadsXsec())//it's 1 or 3 or 5
- x=(pad[0]-0.5)*PadSizeX();
- else if(pad[0] > NpadsXsec() && pad[0] <= NpadsX())//it's 2 or 4 or 6
- x=(pad[0]-0.5)*PadSizeX()+DeadZone();
- else
- AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
-
- if(pad[1] > 0 && pad[1] <= NpadsYsec())//it's 1 or 2
- y=(pad[1]-0.5)*PadSizeY();
- else if(pad[1] > NpadsYsec() && pad[1] <= 2*NpadsYsec())//it's 3 or 4
- y=(pad[1]-0.5)*PadSizeY()+DeadZone();
- else if(pad[1] > 2*NpadsYsec() && pad[1]<= NpadsY())//it's 5 or 6
- y=(pad[1]-0.5)*PadSizeY()+2*DeadZone();
- else
- AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
-
- return TVector2(x,y);
-}
-//__________________________________________________________________________________________________
-TVector2 AliRICHParam::Pad2Loc(Int_t pad)
-{
-//Converts absolute pad number to local position in LORS
-//LORS is a chamber reference system with origin in left-down coner looking from IP
-//Arguments: pad- absolute pad number
-// Returns: pad center position as TVector2 in PCRS
- TVector2 pos;
- pos.Set((Pad2PadX(pad)-0.5)*PadSizeX() , (Pad2PadY(pad)-0.5)*PadSizeY());//set to sector LORS
- return pos;
-}
-//__________________________________________________________________________________________________
-Double_t AliRICHParam::GainSag(Double_t x,Int_t sector)
-{
-//Returns % of gain variation due to wire sagita.
-//All curves are parametrized as per sector basis, so x must be apriory transformed to the Sector RS.
-//Here x is a distance along wires.
- x-=SectorSizeX()/2;
- if(x>SectorSizeX()) x-=SectorSizeX();
- switch(HV(sector)){
- case 2150: return 9e-6*TMath::Power(x,4)+2e-7*TMath::Power(x,3)-0.0316*TMath::Power(x,2)-3e-4*x+25.367;//%
- case 2100: return 8e-6*TMath::Power(x,4)+2e-7*TMath::Power(x,3)-0.0283*TMath::Power(x,2)-2e-4*x+23.015;
- case 2050: return 7e-6*TMath::Power(x,4)+1e-7*TMath::Power(x,3)-0.0254*TMath::Power(x,2)-2e-4*x+20.888;
- case 2000: return 6e-6*TMath::Power(x,4)+8e-8*TMath::Power(x,3)-0.0227*TMath::Power(x,2)-1e-4*x+18.961;
- default: return 0;
- }
-}
-//__________________________________________________________________________________________________
-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, or 0 if the hit in the dead zone.
-//eloss=0 means photon which produces 1 electron only eloss > 0 for Mip
- if(Loc2Sec(x2)==-1) 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(const TVector2 &x2,const TVector &pad)
-{
-//Calculates the charge fraction induced to given pad by the hit from the given point.
-//Integrated Mathieson distribution is used.
- TVector2 center2=Pad2Loc(pad);//gives center of requested pad
- Double_t normXmin=(x2.X()-center2.X()-PadSizeX()/2) /Pc2Cath();//parametrise for Mathienson
- Double_t normXmax=(x2.X()-center2.X()+PadSizeX()/2) /Pc2Cath();
- Double_t normYmin=(x2.Y()-center2.Y()-PadSizeY()/2) /Pc2Cath();
- Double_t normYmax=(x2.Y()-center2.Y()+PadSizeY()/2) /Pc2Cath();
-
-//requested pad might not belong to the sector of the given hit position, hence the check:
- return (Loc2Sec(x2)!=Pad2Sec(pad)) ? 0:Mathieson(normXmin, normYmin, normXmax, normYmax);
-}
-//__________________________________________________________________________________________________
-Double_t AliRICHParam::Mathieson(Double_t x1,Double_t y1,Double_t x2,Double_t y2)
-{
-//This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
-//Arguments: x1- diff between center of distribution and left margin of interested pad divided by anod-cathode distance
-// x2,y1,y2- analogically
-// Returns: a charge fraction [0-1].
- 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;
-
- Double_t ux1=kSqrtKx3*TMath::TanH(kX2*x1);
- Double_t ux2=kSqrtKx3*TMath::TanH(kX2*x2);
- Double_t uy1=kSqrtKy3*TMath::TanH(kY2*y1);
- Double_t uy2=kSqrtKy3*TMath::TanH(kY2*y2);
- return 4*kX4*(TMath::ATan(ux2)-TMath::ATan(ux1))*kY4*(TMath::ATan(uy2)-TMath::ATan(uy1));
-}
-//__________________________________________________________________________________________________
-TVector AliRICHParam::Loc2Area(const TVector2 &x2)
-{
-//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.
- TVector area(4);
- TVector pad=Loc2Pad(x2);
- area[0]=area[2]=pad[0]; area[1]=area[3]=pad[1];//area is just a pad fired
- if(pad[0]!=1 && pad[0]!= NpadsXsec()+1 ) area[0]--; //left down coner X
- if(pad[1]!=1 && pad[1]!= NpadsYsec()+1 && pad[1]!= 2*NpadsYsec()+1) area[1]--; //left down coner Y
- if(pad[0]!=NpadsXsec() && pad[0]!= NpadsX() ) area[2]++; //right up coner X
- if(pad[1]!=NpadsYsec() && pad[1]!= 2*NpadsYsec() && pad[1]!= NpadsY() ) area[3]++; //right up coner Y
- return area;
-}
-//__________________________________________________________________________________________________
-Bool_t AliRICHParam::IsOverTh(Int_t ,TVector ,Double_t q)
-{
-//Checks if the current q is over threshold and FEE will save this value to data concentrator.
- return (q>NsigmaTh()*(SigmaThMean()+(1.-2*gRandom->Rndm())*SigmaThSpread()));
-}
-//__________________________________________________________________________________________________
-#endif //AliRICHParam_h
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+AliRICHParam* AliRICHParam::Instance()
+{
+// Return pointer to the AliRICHParam singleton.
+// Arguments: none
+// Returns: pointer to the instance of AliRICHParam or 0 if no geometry
+ if(!fgInstance)
+ if(gGeoManager) new AliRICHParam;
+ else Printf("AliRICHParam> Error:: No geometry defined!");
+ return fgInstance;
+}//Instance()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+#endif
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