#ifndef AliRICHParam_h
#define AliRICHParam_h
+#include <TError.h>
+#include <TMath.h>
+#include <TObjArray.h>
#include <TObject.h>
-#include "AliRICHConst.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 kBad=-101; //useful static const to mark initial (uninitalised) values
+static const int kNsectors=6; //number of sectors per chamber
+
+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 AliRICHParam :public TObject
{
public:
- AliRICHParam();
- virtual ~AliRICHParam() {;}
+//ctor&dtor
+ AliRICHParam():TObject(),fpChambers(0) {CreateChambers();}
+ virtual ~AliRICHParam() {delete fpChambers;}
+//test methodes
+ 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 PadSizeX() {return 0.8;} //pad size x, cm
+ static Double_t PadSizeY() {return 0.84;} //pad size y, cm
- 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 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
- 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;}
+ 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 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;}
- void Offset(Float_t offset) { fOffset=offset;}
- Float_t Offset() const{return fOffset;}
- void Angles(Float_t xy,Float_t yz) { fAngleXY=xy;fAngleYZ=yz;}
- Float_t AngleYZ() const{return fAngleYZ*kD2r;}
- Float_t AngleXY() const{return fAngleXY*kD2r;}
- void AngleRot(Float_t angle) { fAngleRot=angle;}
- Float_t AngleRot() const{return fAngleRot*kD2r;}
- void GapThickness(Float_t a) { fGapThickness=a;}
- Float_t GapThickness() const{return fGapThickness;}
- 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;}
- void QuartzThickness(Float_t a) { fQuartzThickness=a;}
- Float_t QuartzThickness() const{return fQuartzThickness;}
- 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;}
- void FreonThickness(Float_t a) { fFreonThickness=a;}
- Float_t FreonThickness() const{return fFreonThickness;}
- void RadiatorToPads(Float_t a) { fRadiatorToPads=a;}
- Float_t RadiatorToPads() const{return fRadiatorToPads;}
-
- 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
+ static Int_t HV(Int_t sector) {
+ if (sector>=1 && sector <=6)
+ return fgHV[sector-1];
+ else {
+ return kBad;
+ }
+ } //high voltage for this sector
+ static void SetHV(Int_t sector,Int_t hv){fgHV[sector-1]=hv;}
+//optical properties methodes
+ 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 absorption length (cm) for photon with given energy (eV)
+ static Float_t AbsGel(Float_t) {return 500;} //Aerogel absorption length (cm) for photon with given energy (eV)
+ static Float_t RefIdxC6F14(Float_t eV) {return eV*0.0172+1.177;} //Freon ref index for photon with given energy (eV)
+ static Float_t RefIdxCH4(Float_t) {return 1.000444;} //Methane ref index for photon with given energy (eV)
+ 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
+//trasformation methodes
+ inline static TVector Loc2Area(const TVector2 &x2); //return area affected by hit x2
+ inline static Int_t Loc2Sec(const TVector2 &x2); //return sector containing given position
+ static Int_t Loc2Sec(Double_t x,Double_t y) {return Loc2Sec(TVector2(x,y));} //return sector containing given position
+ inline static TVector Loc2Pad(const TVector2 &x2); //return pad containing given position
+ static TVector Loc2Pad(Double_t x,Double_t y) {return Loc2Pad(TVector2(x,y));} //return pad containing given position
+ inline static TVector2 Pad2Loc(TVector pad); //return 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)
+ inline static Int_t Pad2Sec(const TVector &pad); //return sector of given pad
+ 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
+ static Bool_t IsAccepted(const TVector2 &x2) {return ( x2.X()>=0 && x2.X()<=PcSizeX() && x2.Y()>=0 && x2.Y()<=PcSizeY() ) ? kTRUE:kFALSE;}
+//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 kBad: 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 hit eloss=0 for photons
+ inline 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
+
+ inline 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);}
- Int_t fCurrentPadX,fCurrentPadY; //???
- Int_t fCurrentWire; //???
-
- Float_t fSizeX; Float_t fSizeY; Float_t fSizeZ; //chamber outer size, cm
- Float_t fAngleRot; //azimuthal rotation XY plane, deg
- Float_t fAngleYZ; //angle between chambers YZ plane, deg
- Float_t fAngleXY; //angle between chambers XY plane, deg
- Float_t fOffset; //chambers offset from IP, cm
- Float_t fGapThickness; //gap thickness, cm
- Float_t fProximityGapThickness; //proximity gap thickness, cm
- Float_t fQuartzLength; Float_t fQuartzWidth; Float_t fQuartzThickness; //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
- Float_t fFreonThickness; //freon thickness
- Float_t fRadiatorToPads; //distance from radiator to pads, 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)
+ static Bool_t fgIsAerogel; //aerogel geometry instead of normal RICH flag
+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?
- ClassDef(AliRICHParam,2) //RICH main parameters
+ 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
+ ClassDef(AliRICHParam,5) //RICH main parameters class
};
//__________________________________________________________________________________________________
-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])
+{
+//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=kBad;
+ if (v2.X() >= x0 && v2.X() <= x1 ) sector=1;
+ else if(v2.X() >= x2 && v2.X() <= x3 ) sector=2;
+ else return kBad;
+
+ 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 kBad;
+ 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==kBad) {pad[0]=pad[1]=kBad; 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;
}
//__________________________________________________________________________________________________
-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(const TVector &pad)
+{
+//Determines sector containing the given pad.
+ Int_t sector=kBad;
+ 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=kBad,y=kBad;
+ 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
- return kFALSE;
-}//Bool_t AliRICHParam::SigGenCond(Float_t x,Float_t y)
+ AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
+
+ return TVector2(x,y);
+}
+//__________________________________________________________________________________________________
+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)==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);
+}
//__________________________________________________________________________________________________
-Int_t AliRICHParam::Neighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4])const
+Double_t AliRICHParam::FracQdc(const TVector2 &x2,const TVector &pad)
{
- 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;
+//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 xMin,Double_t yMin,Double_t xMax,Double_t yMax)
+{
+//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;
+
+ Double_t ux1=kSqrtKx3*TMath::TanH(kX2*xMin);
+ Double_t ux2=kSqrtKx3*TMath::TanH(kX2*xMax);
+ Double_t uy1=kSqrtKy3*TMath::TanH(kY2*yMin);
+ Double_t uy2=kSqrtKy3*TMath::TanH(kY2*yMax);
+ 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
+
+
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