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Simplifying calling test, explicite functions for each type of test
[u/mrichter/AliRoot.git] / RICH / AliRICHParam.h
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d48cca74 1#ifndef AliRICHParam_h
2#define AliRICHParam_h
3
1c349ae5 4#include <TError.h>
c712cb2f 5#include <TMath.h>
1c349ae5 6#include <TObjArray.h>
7#include <TObject.h>
998b831f 8#include <TMath.h>
1c349ae5 9#include <TRandom.h>
10#include <TVector.h>
3582c1f9 11#include <TVector2.h>
e42a7b46 12#include <TVector3.h>
998b831f 13#include <TRandom.h>
14#include <TError.h>
15#include <TObjArray.h>
16#include <AliLog.h>
17#include <TClass.h>
18
e42a7b46 19static const int kNchambers=7; //number of RICH chambers
20static const int kNpadsX = 160; //number of pads along X in single chamber
21static const int kNpadsY = 144; //number of pads along Y in single chamber
e42a7b46 22static const int kNsectors=6; //number of sectors per chamber
ed3ceb24 23
ed3ceb24 24static const int kCerenkov=50000050; //??? go to something more general like TPDGCode
25static const int kFeedback=50000051; //??? go to something more general like TPDGCode
26
e42a7b46 27class AliRICHChamber;
ed3ceb24 28
ae754cdf 29// Class providing all the needed parametrised information
30// to construct the geometry, to define segmentation and to provide response model
31// In future will also provide all the staff needed for alignment and calibration
32
33
d48cca74 34class AliRICHParam :public TObject
35{
36public:
a25b3368 37//ctor&dtor
e42a7b46 38 AliRICHParam():TObject(),fpChambers(0) {CreateChambers();}
39 virtual ~AliRICHParam() {delete fpChambers;}
a25b3368 40//test methodes
c4a03891 41 void Print(Option_t *opt="") const; //print current parametrization
a25b3368 42 void Test() {TestSeg();TestTrans();TestResp();} //test all groups of methodes
43 void TestResp(); //test the response group of methodes
44 void TestSeg(); //test the segmentation group of methodes
45 void TestTrans(); //test the transform group of methodes
d3eb6079 46 static void DrawAxis();
47 static void DrawSectors();
a25b3368 48//flags staff
49 static void SetAerogel(Bool_t a) {fgIsAerogel=a;}
50 static Bool_t IsAerogel() {return fgIsAerogel;}
51 static void SetRadioSrc(Bool_t a) {fgIsRadioSrc=a;}
52 static Bool_t IsRadioSrc() {return fgIsRadioSrc;}
53 static void SetTestBeam(Bool_t a) {fgIsTestBeam=a;}
54 static Bool_t IsTestBeam() {return fgIsTestBeam;}
55 static void SetWireSag(Bool_t a) {fgIsWireSag=a;}
56 static Bool_t IsWireSag() {return fgIsWireSag;}
57 static void SetResolveClusters(Bool_t a) {fgIsResolveClusters=a;}
58 static Bool_t IsResolveClusters() {return fgIsResolveClusters;}
59//Chambers manipulation methodes
60 void CreateChambers(); //form chamber structure
998b831f 61 AliRICHChamber* C(Int_t i) {return (AliRICHChamber*)fpChambers->UncheckedAt(i-1);} //returns pointer to chamber i
a25b3368 62 Int_t Nchambers() {return fpChambers->GetEntriesFast();} //returns number of chambers
63//Geometrical properties
0422a446 64 static Int_t NpadsX() {return kNpadsX;} //pads along X in chamber
65 static Int_t NpadsY() {return kNpadsY;} //pads along Y in chamber
66 static Int_t NpadsXsec() {return NpadsX()/2;} //pads along X in sector
67 static Int_t NpadsYsec() {return NpadsY()/3;} //pads along Y in sector
68 static Double_t DeadZone() {return 2.6;} //dead zone size in cm
69 static Double_t SectorSizeX() {return NpadsX()*PadSizeX()/2;} //sector size x, cm
70 static Double_t SectorSizeY() {return NpadsY()*PadSizeY()/3;} //sector size y, cm
71 static Double_t PcSizeX() {return NpadsX()*PadSizeX()+DeadZone();} //PC size x, cm
72 static Double_t PcSizeY() {return NpadsY()*PadSizeY()+2*DeadZone();} //PC size y, cm
73 static Double_t Zfreon() {return 1.5;} //freon thinkness, cm
74 static Double_t Zwin() {return 0.5;} //radiator quartz window, cm
75 static Double_t Pc2Win() {return 8.0;} //cm between CsI PC and radiator quartz window
76 static Double_t Pc2Coll() {return 7.0;} //cm between CsI PC and third wire grid (collection wires)
77 static Double_t Pc2Anod() {return 0.204;} //cm between CsI PC and first wire grid (anod wires)
78 static Double_t Pc2Cath() {return 0.445;} //cm between CsI PC and second wire grid (cathode wires)
79 static Double_t Freon2Pc() {return Zfreon()+Zwin()+Pc2Win();} //cm between CsI PC and entrance to freon
80 static Double_t PitchAnod() {return PadSizeY()/2;} //cm between anode wires
81 static Double_t PitchCath() {return PadSizeY()/4;} //cm between cathode wires
82 static Double_t PitchColl() {return 0.5;} //cm between collection wires
83 static Double_t PadSizeX() {return 0.8;} //pad size x, cm
84 static Double_t PadSizeY ( ){return 0.84;} //pad size y, cm
85//trasformation methodes
86 static Int_t Pad2Cha (Int_t pad ){return pad/100000000; }//abs pad -> chamber
87 static Int_t Pad2Sec (Int_t pad ){return pad%100000000/1000000; }//abs pad -> sector
88 static Int_t Pad2PadX (Int_t pad ){return pad%1000000/1000; }//abs pad -> pad x
89 static Int_t Pad2PadY (Int_t pad ){return pad%1000000%100; }//abs pad -> pad y
90 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
91 static inline TVector2 Pad2Loc (Int_t pad ); //abs pad ->LORS
92 static inline TVector2 Pad2Loc (TVector pad ); //pad -> LORS returns center of the pad
93 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)
94 static inline TVector Loc2Area (const TVector2 &x2 ); //pads area affected by hit x2. area is LeftDown-RightUp pad numbers
95 static inline Int_t Loc2Sec (const TVector2 &x2 ); //LORS -> sector
96 static Int_t Loc2Sec (Double_t x,Double_t y ){return Loc2Sec(TVector2(x,y));} //LORS -> sector
97 static inline TVector Loc2Pad (const TVector2 &x2 ); //LORS -> pad
98 static TVector Loc2Pad (Double_t x,Double_t y ){return Loc2Pad(TVector2(x,y));} //LORS -> pad
99 static inline Int_t Pad2Sec (const TVector &pad ); //pad -> sector
100 static inline Int_t PadNeighbours (Int_t iPadX,Int_t iPadY,Int_t aListX[4],Int_t aListY[4]); //pad -> list of it neighbours
101 static Bool_t IsAccepted (const TVector2 &x2 ){return ( x2.X()>=0 && x2.X()<=PcSizeX() && x2.Y()>=0 && x2.Y()<=PcSizeY() ) ? kTRUE:kFALSE;}
102//optical properties methodes
103 static Double_t MeanCkovEnergy( ){return 6.766;} //mean Ckov energy according to the total trasmission curve
104 static Float_t PhotonEnergy (Int_t i ){return 0.1*i+5.5;} //photon energy (eV) for i-th point
105 static Float_t AbsCH4 (Float_t ev ); //CH4 abs len (cm)
106 static Float_t AbsGel (Float_t ){return 500;} //Aerogel abs len (cm)
107 static Float_t RefIdxC6F14 (Float_t eV ){return eV*0.0172+1.177;} //Freon ref idx
108 static Float_t RefIdxCH4 (Float_t ){return 1.000444;} //Methane ref idx
109 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
110 static Float_t RefIdxGel (Float_t ){return 1.05;} //aerogel ref index
111 static Float_t DenGel ( ){return (RefIdxGel(0)-1)/0.21;} //aerogel density gr/cm^3 parametrization by E.Nappi
112
e42a7b46 113
e42a7b46 114 static Double_t IonisationPotential() {return 26.0e-9;} //for CH4 in GeV taken from ????
115 static TVector2 MathiesonDelta() {return TVector2(5*0.18,5*0.18);} //area of 5 sigmas of Mathieson distribution (cm)
116 static Int_t MaxQdc() {return 4095;} //QDC number of channels
fab9e039 117
118 static Int_t QthMIP() {return 100;}
119 static Double_t DmatchMIP() {return 1.;}
120 static Double_t PmodMax() {return 6.5;}
0fe8fa07 121 static Int_t HV(Int_t sector) {if (sector>=1 && sector <=6) return fgHV[sector-1]; else return -1;} //high voltage for this sector
3582c1f9 122 static void SetHV(Int_t sector,Int_t hv){fgHV[sector-1]=hv;}
a25b3368 123//charge response methodes
124 inline static Double_t Mathieson(Double_t x1,Double_t x2,Double_t y1,Double_t y2); //Mathienson integral over given limits
e42a7b46 125 inline static Double_t GainSag(Double_t x,Int_t sector); //gain variations in %
0fe8fa07 126 static Double_t QdcSlope(Int_t sec){switch(sec){case -1: return 0; default: return 33;}} //weight of electon in QDC channels
a25b3368 127 static Double_t Gain(const TVector2 &x2){//gives chamber gain in terms of QDC channels for given point in local ref system
128 if(fgIsWireSag) return QdcSlope(Loc2Sec(x2))*(1+GainSag(x2.X(),Loc2Sec(x2))/100);
129 else return QdcSlope(Loc2Sec(x2));}
130 inline static Double_t FracQdc(const TVector2 &x2,const TVector &pad); //charge fraction to pad from hit
0422a446 131 inline static Int_t TotQdc(TVector2 x2,Double_t eloss); //total charge for Eloss (GeV) 0 for photons
0fe8fa07 132 inline static Bool_t IsOverTh(Int_t c,TVector pad,Double_t q); //is QDC of the pad registered by FEE
e42a7b46 133 static Int_t NsigmaTh() {return fgNsigmaTh;} //
134 static Float_t SigmaThMean() {return fgSigmaThMean;} //QDC electronic noise mean
135 static Float_t SigmaThSpread() {return fgSigmaThSpread;} //QDC electronic noise width
e42a7b46 136
ae754cdf 137 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
ed83829e 138 -2.66575e-3*TMath::Sin(4*TMath::Pi()/PadSizeX()*x)
f770edb5 139 +2.80553e-3*TMath::Sin(6*TMath::Pi()/PadSizeX()*x)+0.0070;}
d0831219 140 static void ReadErrFiles(); //Read Err file parameters
fab9e039 141 static TVector3 SigmaSinglePhoton(Int_t Npart, Double_t mom, Double_t theta, Double_t phi); //Find Sigma for single photon from momentum and particle id
142 static TVector3 SigmaSinglePhoton(Double_t thetaCer, Double_t theta, Double_t phi); //Fing sigma for single photon from thetacer
101624cd 143 static Double_t Interpolate(Double_t par[4][330],Double_t x, Double_t y, Double_t phi); //Find the error value from interpolation
144
56030c8d 145 static TVector3 ForwardTracing(TVector3 entranceTrackPoint,TVector3 vectorTrack, Double_t thetaC, Double_t phiC); //it traces foward a photon from Emission Point to PC
d0831219 146 static TVector3 PlaneIntersect(TVector3 vstart,TVector3 p0,TVector3 n,TVector3 v0); //it finds intersection between straight track and plane
147 static Double_t SnellAngle(Float_t n1, Float_t n2, Float_t theta1); // Snell law
148 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
149 //Detector Reference System
0422a446 150
a25b3368 151 static Bool_t fgIsAerogel; //aerogel geometry instead of normal RICH flag
068217e3 152 static Double_t fgMass[5]; // mass array
e42a7b46 153protected:
a25b3368 154 static Bool_t fgIsRadioSrc; //radioactive source instead of radiators flag
155 static Bool_t fgIsTestBeam; //test beam geometry instead of normal RICH flag
e42a7b46 156 static Bool_t fgIsWireSag; //wire sagitta ON/OFF flag
157 static Bool_t fgIsResolveClusters; //declustering ON/OFF flag
d3eb6079 158 static Bool_t fgIsFeedback; //generate feedback photon?
a25b3368 159
160 TObjArray *fpChambers; //list of chambers
e42a7b46 161 static Int_t fgHV[6]; //HV applied to anod wires
e42a7b46 162 static Int_t fgNsigmaTh; //n. of sigmas to cut for zero suppression
163 static Float_t fgSigmaThMean; //sigma threshold value
164 static Float_t fgSigmaThSpread; //spread of sigma
101624cd 165
166 static Double_t fgErrChrom[4][330]; //
167 static Double_t fgErrGeom[4][330]; //
168 static Double_t fgErrLoc[4][330]; //Chromatic, Geometric and Localization array to parametrize SigmaCerenkov
169
170 ClassDef(AliRICHParam,6) //RICH main parameters class
d48cca74 171};
c2c6679b 172//__________________________________________________________________________________________________
c712cb2f 173Int_t AliRICHParam::PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4])
174{
a25b3368 175//Determines all the neighbouring pads for the given one (iPadX,iPadY). Returns total number of these pads.
176//Dead zones are taken into account, meaning pads from different sector are not taken.
e42a7b46 177// 1
178// 2 3
179// 4
c712cb2f 180 Int_t nPads=0;
e42a7b46 181 if(iPadY!=NpadsY()&&iPadY!=2*NpadsYsec()&&iPadY!=NpadsYsec()){listX[nPads]=iPadX; listY[nPads]=iPadY+1; nPads++;} //1
182 if(iPadX!=1&&iPadX!=NpadsXsec()+1) {listX[nPads]=iPadX-1; listY[nPads]=iPadY; nPads++;} //2
183 if(iPadX!=NpadsXsec()&&iPadX!=NpadsX()) {listX[nPads]=iPadX+1; listY[nPads]=iPadY; nPads++;} //3
184 if(iPadY!=1&&iPadY!=NpadsYsec()+1&&2*NpadsYsec()+1) {listX[nPads]=iPadX; listY[nPads]=iPadY-1; nPads++;} //4
ed3ceb24 185
c712cb2f 186 return nPads;
187}//Pad2ClosePads()
188//__________________________________________________________________________________________________
a25b3368 189Int_t AliRICHParam::Loc2Sec(const TVector2 &v2)
3582c1f9 190{
a25b3368 191//Determines sector containing the given point.
192//Returns sector code:
e42a7b46 193//y ^ 5 6
194// | 3 4
195// | 1 2
196// -------> x
197 Double_t x0=0; Double_t x1=SectorSizeX(); Double_t x2=SectorSizeX()+DeadZone(); Double_t x3=PcSizeX();
198 Double_t y0=0; Double_t y1=SectorSizeY(); Double_t y2=SectorSizeY()+DeadZone(); Double_t y3=2*SectorSizeY()+DeadZone();
199 Double_t y4=PcSizeY()-SectorSizeY(); Double_t y5=PcSizeY();
200
0fe8fa07 201 Int_t sector=-1;
a25b3368 202 if (v2.X() >= x0 && v2.X() <= x1 ) sector=1;
203 else if(v2.X() >= x2 && v2.X() <= x3 ) sector=2;
0fe8fa07 204 else return -1;
3582c1f9 205
a25b3368 206 if (v2.Y() >= y0 && v2.Y() <= y1 ) ; //sectors 1 or 2
207 else if(v2.Y() >= y2 && v2.Y() <= y3 ) sector+=2; //sectors 3 or 4
208 else if(v2.Y() >= y4 && v2.Y() <= y5 ) sector+=4; //sectors 5 or 6
0fe8fa07 209 else return -1;
3582c1f9 210 return sector;
c712cb2f 211}//Loc2Sec(Double_t x, Double_t y)
c2c6679b 212//__________________________________________________________________________________________________
a25b3368 213TVector AliRICHParam::Loc2Pad(const TVector2 &loc)
3582c1f9 214{
a25b3368 215//Determines pad number TVector(padx,pady) containing the given point x2 defined in the chamber RS.
216//Pad count starts in lower left corner from 1,1 to 144,160 in upper right corner of a chamber.
e42a7b46 217//y ^ 5 6
218// | 3 4
219// | 1 2
220// -------> x
221 TVector pad(2);
a25b3368 222 Int_t sec=Loc2Sec(loc);//trasforms x2 to sector reference system
0fe8fa07 223 if(sec==-1) {pad[0]=pad[1]=-1; return pad;}
a25b3368 224//first we deal with x
225 if(sec==1||sec==3||sec==5) pad[0]= Int_t( loc.X() / PadSizeX() )+1; //sector 1 or 3 or 5
226 else pad[0]=NpadsX() - Int_t( (PcSizeX()-loc.X()) / PadSizeX() ) ; //sector 2 or 4 or 6
227//second deal with y
d3eb6079 228 if(sec==1||sec==2) pad[1]=Int_t( loc.Y() / PadSizeY())+1; //sector 1 or 2
229 else if(sec==3||sec==4) pad[1]=Int_t( (loc.Y()-SectorSizeY()-DeadZone()) / PadSizeY())+NpadsYsec()+1; //sector 3 or 4
230 else pad[1]=NpadsY() - Int_t( (PcSizeY()-loc.Y()) / PadSizeY()); //sector 5 or 6
e42a7b46 231 return pad;
3582c1f9 232}
233//__________________________________________________________________________________________________
998b831f 234Int_t AliRICHParam::Pad2Sec(const TVector &pad)
3582c1f9 235{
a25b3368 236//Determines sector containing the given pad.
0fe8fa07 237 Int_t sector=-1;
e42a7b46 238 if (pad[0] >= 1 && pad[0] <= NpadsXsec() ) {sector=1;}
239 else if(pad[0] > NpadsXsec() && pad[0] <= NpadsX() ) {sector=2;}
998b831f 240 else AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
e42a7b46 241
242 if (pad[1] >= 1 && pad[1] <= NpadsYsec() ) {}
243 else if(pad[1] > NpadsYsec() && pad[1] <= 2*NpadsYsec() ) {sector+=2;}
244 else if(pad[1] > 2*NpadsYsec() && pad[1] <= NpadsY() ) {sector+=4;}
998b831f 245 else AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
c712cb2f 246
e42a7b46 247 return sector;
c712cb2f 248}//Pad2Sec()
249//__________________________________________________________________________________________________
e42a7b46 250TVector2 AliRICHParam::Pad2Loc(TVector pad)
c712cb2f 251{
a25b3368 252//Returns position of the center of the given pad in local system of the chamber (cm)
e42a7b46 253// y ^ 5 6
998b831f 254// | 3 4 sector numbers
e42a7b46 255// | 1 2
256// -------> x
0fe8fa07 257 Double_t x=-1,y=-1;
e42a7b46 258 if(pad[0] > 0 && pad[0] <= NpadsXsec())//it's 1 or 3 or 5
259 x=(pad[0]-0.5)*PadSizeX();
260 else if(pad[0] > NpadsXsec() && pad[0] <= NpadsX())//it's 2 or 4 or 6
261 x=(pad[0]-0.5)*PadSizeX()+DeadZone();
c2c6679b 262 else
998b831f 263 AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
e42a7b46 264
265 if(pad[1] > 0 && pad[1] <= NpadsYsec())//it's 1 or 2
266 y=(pad[1]-0.5)*PadSizeY();
267 else if(pad[1] > NpadsYsec() && pad[1] <= 2*NpadsYsec())//it's 3 or 4
268 y=(pad[1]-0.5)*PadSizeY()+DeadZone();
269 else if(pad[1] > 2*NpadsYsec() && pad[1]<= NpadsY())//it's 5 or 6
270 y=(pad[1]-0.5)*PadSizeY()+2*DeadZone();
271 else
998b831f 272 AliDebugClass(1,Form("Wrong pad (%3.0f,%3.0f)",pad[0],pad[1]));
e42a7b46 273
3582c1f9 274 return TVector2(x,y);
275}
c60862bf 276//__________________________________________________________________________________________________
0422a446 277TVector2 AliRICHParam::Pad2Loc(Int_t pad)
278{
279//Converts absolute pad number to local position in LORS
280//LORS is a chamber reference system with origin in left-down coner looking from IP
281//Arguments: pad- absolute pad number
282// Returns: pad center position as TVector2 in PCRS
283 TVector2 pos;
284 pos.Set((Pad2PadX(pad)-0.5)*PadSizeX() , (Pad2PadY(pad)-0.5)*PadSizeY());//set to sector LORS
285 return pos;
286}
287//__________________________________________________________________________________________________
e42a7b46 288Double_t AliRICHParam::GainSag(Double_t x,Int_t sector)
c60862bf 289{
a25b3368 290//Returns % of gain variation due to wire sagita.
291//All curves are parametrized as per sector basis, so x must be apriory transformed to the Sector RS.
292//Here x is a distance along wires.
e42a7b46 293 x-=SectorSizeX()/2;
294 if(x>SectorSizeX()) x-=SectorSizeX();
3582c1f9 295 switch(HV(sector)){
e42a7b46 296 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;//%
297 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;
298 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;
299 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;
3582c1f9 300 default: return 0;
301 }
c712cb2f 302}
303//__________________________________________________________________________________________________
3582c1f9 304Int_t AliRICHParam::TotQdc(TVector2 x2,Double_t eloss)
305{
a25b3368 306//Calculates the total charge produced by the eloss in point x2 (Chamber RS).
307//Returns this change parametrised in QDC channels, or 0 if the hit in the dead zone.
308//eloss=0 means photon which produces 1 electron only eloss > 0 for Mip
0fe8fa07 309 if(Loc2Sec(x2)==-1) return 0; //hit in the dead zone
3582c1f9 310 Int_t iNelectrons=Int_t(eloss/IonisationPotential()); if(iNelectrons==0) iNelectrons=1;
311 Double_t qdc=0;
312 for(Int_t i=1;i<=iNelectrons;i++) qdc+=-Gain(x2)*TMath::Log(gRandom->Rndm());
313 return Int_t(qdc);
314}
315//__________________________________________________________________________________________________
a25b3368 316Double_t AliRICHParam::FracQdc(const TVector2 &x2,const TVector &pad)
3582c1f9 317{
a25b3368 318//Calculates the charge fraction induced to given pad by the hit from the given point.
319//Integrated Mathieson distribution is used.
e42a7b46 320 TVector2 center2=Pad2Loc(pad);//gives center of requested pad
998b831f 321 Double_t normXmin=(x2.X()-center2.X()-PadSizeX()/2) /Pc2Cath();//parametrise for Mathienson
322 Double_t normXmax=(x2.X()-center2.X()+PadSizeX()/2) /Pc2Cath();
323 Double_t normYmin=(x2.Y()-center2.Y()-PadSizeY()/2) /Pc2Cath();
324 Double_t normYmax=(x2.Y()-center2.Y()+PadSizeY()/2) /Pc2Cath();
325
326//requested pad might not belong to the sector of the given hit position, hence the check:
327 return (Loc2Sec(x2)!=Pad2Sec(pad)) ? 0:Mathieson(normXmin, normYmin, normXmax, normYmax);
3582c1f9 328}
c712cb2f 329//__________________________________________________________________________________________________
0422a446 330Double_t AliRICHParam::Mathieson(Double_t x1,Double_t y1,Double_t x2,Double_t y2)
3582c1f9 331{
0422a446 332//This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
333//Arguments: x1- diff between center of distribution and left margin of interested pad divided by anod-cathode distance
334// x2,y1,y2- analogically
335// Returns: a charge fraction [0-1].
53fd478b 336 const Double_t kSqrtKx3=0.77459667;const Double_t kX2=0.962;const Double_t kX4=0.379;
337 const Double_t kSqrtKy3=0.77459667;const Double_t kY2=0.962;const Double_t kY4=0.379;
c712cb2f 338
0422a446 339 Double_t ux1=kSqrtKx3*TMath::TanH(kX2*x1);
340 Double_t ux2=kSqrtKx3*TMath::TanH(kX2*x2);
341 Double_t uy1=kSqrtKy3*TMath::TanH(kY2*y1);
342 Double_t uy2=kSqrtKy3*TMath::TanH(kY2*y2);
53fd478b 343 return 4*kX4*(TMath::ATan(ux2)-TMath::ATan(ux1))*kY4*(TMath::ATan(uy2)-TMath::ATan(uy1));
0422a446 344}
c712cb2f 345//__________________________________________________________________________________________________
a25b3368 346TVector AliRICHParam::Loc2Area(const TVector2 &x2)
3582c1f9 347{
a25b3368 348//Calculates the area of disintegration for a given point. It's assumed here that this points lays on anode wire.
349//Area is a rectangulare set of pads defined by its left-down and right-up coners.
e42a7b46 350 TVector area(4);
351 TVector pad=Loc2Pad(x2);
352 area[0]=area[2]=pad[0]; area[1]=area[3]=pad[1];//area is just a pad fired
353 if(pad[0]!=1 && pad[0]!= NpadsXsec()+1 ) area[0]--; //left down coner X
354 if(pad[1]!=1 && pad[1]!= NpadsYsec()+1 && pad[1]!= 2*NpadsYsec()+1) area[1]--; //left down coner Y
355 if(pad[0]!=NpadsXsec() && pad[0]!= NpadsX() ) area[2]++; //right up coner X
356 if(pad[1]!=NpadsYsec() && pad[1]!= 2*NpadsYsec() && pad[1]!= NpadsY() ) area[3]++; //right up coner Y
357 return area;
3582c1f9 358}
08479a10 359//__________________________________________________________________________________________________
e42a7b46 360Bool_t AliRICHParam::IsOverTh(Int_t ,TVector ,Double_t q)
3582c1f9 361{
a25b3368 362//Checks if the current q is over threshold and FEE will save this value to data concentrator.
e42a7b46 363 return (q>NsigmaTh()*(SigmaThMean()+(1.-2*gRandom->Rndm())*SigmaThSpread()));
3582c1f9 364}
0422a446 365//__________________________________________________________________________________________________
d48cca74 366#endif //AliRICHParam_h