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d48cca74 | 1 | #ifndef AliRICHParam_h |
2 | #define AliRICHParam_h | |
3 | ||
c712cb2f | 4 | #include <TObject.h> |
5 | #include <TMath.h> | |
3582c1f9 | 6 | #include <TVector2.h> |
c712cb2f | 7 | #include <TRandom.h> |
9e23b054 | 8 | |
ed3ceb24 | 9 | |
10 | static const int kNCH=7; //number of RICH chambers | |
11 | static const int kNpadsX = 144; //number of pads along X in single chamber | |
12 | static const int kNpadsY = 160; //number of pads along Y in single chamber | |
13 | static const int kBad=-101; //useful static const to mark initial (uninitalised) values | |
3582c1f9 | 14 | static const int kNsectors=6; // nb. of sectors per chamber |
ed3ceb24 | 15 | |
16 | static const int kadc_satm = 4096; //dynamic range (10 bits) | |
17 | static const int kCerenkov=50000050; //??? go to something more general like TPDGCode | |
18 | static const int kFeedback=50000051; //??? go to something more general like TPDGCode | |
19 | ||
20 | ||
d48cca74 | 21 | class AliRICHParam :public TObject |
22 | { | |
23 | public: | |
c712cb2f | 24 | AliRICHParam() {;} |
08479a10 | 25 | virtual ~AliRICHParam() {;} |
3582c1f9 | 26 | static const Int_t NpadsX() {return kNpadsX;} //pads along X in chamber |
27 | static const Int_t NpadsY() {return kNpadsY;} //pads along Y in chamber | |
28 | static Int_t NpadsXsec() {return NpadsX()/3;} //pads along X in sector | |
29 | static Int_t NpadsYsec() {return NpadsY()/2;} //pads along Y in sector | |
30 | static Double_t DeadZone() {return 2.6;} //dead zone size in cm | |
31 | static Double_t PadSizeX() {return 0.84;} //pad size x in cm | |
32 | static Double_t PadSizeY() {return 0.8;} //pad size y in cm | |
33 | static Double_t SectorSizeX() {return NpadsX()*PadSizeX()/3;} //sector size x in cm | |
34 | static Double_t SectorSizeY() {return NpadsY()*PadSizeY()/2;} //sector size y in cm | |
35 | static Double_t PcSizeX() {return NpadsX()*PadSizeX()+2*DeadZone();} //photocathode size x in cm | |
36 | static Double_t PcSizeY() {return NpadsY()*PadSizeY()+DeadZone();} //photocathode size y in cm | |
37 | static Double_t WirePitch() {return PadSizeX()/2;} //distance between anode wires | |
c712cb2f | 38 | static Double_t SizeX() {return 132.6;} |
39 | static Double_t SizeY() {return 26;} | |
3582c1f9 | 40 | static Double_t SizeZ() {return 136.7;} |
41 | static Double_t Offset() {return 490+1.267;} //distance from IP to center of chamber in cm | |
42 | static Double_t AngleYZ() {return 19.5*TMath::DegToRad();} //angle between chambers in YZ plane, rad | |
43 | static Double_t AngleXY() {return 20*TMath::DegToRad();} //angle between chambers in XY plane, rad | |
44 | static Double_t AngleRot() {return fgAngleRot*TMath::DegToRad();} //RICH rotation around Z, rad | |
c712cb2f | 45 | static Double_t FreonThickness() {return 1.5;} |
46 | static Double_t QuartzThickness() {return 0.5;} | |
47 | static Double_t GapThickness() {return 8.0;} | |
48 | static Double_t RadiatorToPads() {return FreonThickness()+QuartzThickness()+GapThickness();} | |
3582c1f9 | 49 | static Double_t ProximityGap() {return 0.445;} |
c712cb2f | 50 | static Double_t AnodeCathodeGap() {return 0.2;} |
51 | static Double_t QuartzLength() {return 133;} | |
52 | static Double_t QuartzWidth() {return 127.9;} | |
53 | static Double_t OuterFreonLength() {return 133;} | |
54 | static Double_t OuterFreonWidth() {return 41.3;} | |
55 | static Double_t InnerFreonLength() {return 133;} | |
56 | static Double_t InnerFreonWidth() {return 41.3;} | |
57 | static Double_t IonisationPotential() {return 26.0e-9;} | |
3582c1f9 | 58 | static TVector2 MathiesonDelta() {return TVector2(5*0.18,5*0.18);} |
c712cb2f | 59 | static Int_t MaxQdc() {return 4095;} |
c712cb2f | 60 | static Double_t AlphaFeedback(Int_t sec) {HV(sec);return 0.036;} |
853634d3 | 61 | |
3582c1f9 | 62 | static Bool_t IsResolveClusters() {return fgIsResolveClusters;} //go after resolved clusters? |
63 | static Bool_t IsWireSag() {return fgIsWireSag;} //take wire sagita in account? | |
64 | static Int_t HV(Int_t sector) {return fgHV[sector-1];} //high voltage for this sector | |
65 | static void IsResolveClusters(Bool_t a) {fgIsResolveClusters=a;} | |
66 | static void SetWireSag(Bool_t status) {fgIsWireSag=status;} | |
67 | static void SetHV(Int_t sector,Int_t hv){fgHV[sector-1]=hv;} | |
68 | static void SetAngleRot(Double_t rot) {fgAngleRot =rot;} | |
c712cb2f | 69 | |
3582c1f9 | 70 | inline static void Loc2Area(TVector2 x2,Int_t &padxMin,Int_t &padyMin,Int_t &padxMax,Int_t &padyMax); // |
71 | inline static Int_t Loc2Pad(TVector2 x2,Int_t &padx,Int_t &pady); //return sector and pad | |
72 | inline static TVector2 Pad2Loc(Int_t padx,Int_t pady); //return center of the pad | |
73 | static Int_t Sector(Int_t padx,Int_t pady) {return Pad2Sec(padx,pady);} //sector of this pad | |
74 | static Int_t Sector(TVector2 x2) {int x,y;return Loc2Pad(x2,x,y);} //sector of this point | |
75 | 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 | |
76 | inline static TVector2 ShiftToWirePos(TVector2 x2); //shift to the nearest wire | |
543d5224 | 77 | |
3582c1f9 | 78 | inline static Double_t Mathieson(Double_t lx1,Double_t lx2,Double_t ly1,Double_t ly2); //Mathienson integral over these limits |
79 | inline static Double_t GainSag(Double_t y,Int_t sector); //gain variations in % | |
80 | inline static Double_t QdcSlope(Int_t sec); //weight of electon in QDC channels | |
81 | inline static Double_t Gain(TVector2 x2); //gain for point in ChRS | |
82 | inline static Double_t FracQdc(TVector2 x2,Int_t padx,Int_t pady); //charge fraction to pad from hit | |
83 | inline static Int_t TotQdc(TVector2 x2,Double_t eloss); //total charge for hit eloss=0 for photons | |
84 | inline Bool_t IsOverTh(Int_t iChamber, Int_t x, Int_t y, Double_t q); // | |
85 | static Int_t NsigmaTh() {return fgNsigmaTh;} // | |
86 | static Float_t SigmaThMean() {return fgSigmaThMean;} // | |
87 | static Float_t SigmaThSpread() {return fgSigmaThSpread;} // | |
88 | void GenSigmaThMap(); //generate pedestal map | |
89 | static void Print(); | |
d48cca74 | 90 | protected: |
3582c1f9 | 91 | inline static Int_t Loc2Sec(TVector2 &x2); //return sector, x2->Sector RS |
92 | inline static Int_t Pad2Sec(Int_t &padx,Int_t &pady); //return sector, (padx,pady)->Sector RS | |
93 | static Bool_t fgIsWireSag; //is wire sagitta taken into account | |
94 | static Bool_t fgIsResolveClusters; //performs declustering or not | |
95 | static Int_t fgHV[6]; //HV applied to anod wires | |
96 | static Double_t fgAngleRot; //rotation of RICH from up postion (0,0,490)cm | |
97 | static Float_t fSigmaThMap[kNCH][kNpadsX][kNpadsY]; //sigma of the pedestal distributions for all pads | |
98 | static Int_t fgNsigmaTh; //n. of sigmas to cut for zero suppression | |
99 | static Float_t fgSigmaThMean; //sigma threshold value | |
100 | static Float_t fgSigmaThSpread; //spread of sigma | |
c712cb2f | 101 | ClassDef(AliRICHParam,4) //RICH main parameters |
d48cca74 | 102 | }; |
c2c6679b | 103 | //__________________________________________________________________________________________________ |
c712cb2f | 104 | Int_t AliRICHParam::PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4]) |
105 | { | |
3582c1f9 | 106 | // Determines all the neighbouring pads for the given one. Returns total amount of these pads. |
107 | // Dead zones are taken into account. | |
c712cb2f | 108 | Int_t nPads=0; |
ed3ceb24 | 109 | if(iPadY!=NpadsY()&&iPadY!=NpadsYsec()) {listX[nPads]=iPadX; listY[nPads]=iPadY+1; nPads++;} |
110 | if(iPadX!=NpadsXsec()&&iPadX!=2*NpadsXsec()&&iPadX!=NpadsX()){listX[nPads]=iPadX+1; listY[nPads]=iPadY; nPads++;} | |
111 | if(iPadY!=1&&iPadY!=NpadsYsec()+1) {listX[nPads]=iPadX; listY[nPads]=iPadY-1; nPads++;} | |
112 | if(iPadX!=1&&iPadX!=NpadsXsec()+1&&iPadX!=2*NpadsXsec()+1) {listX[nPads]=iPadX-1; listY[nPads]=iPadY; nPads++;} | |
113 | ||
c712cb2f | 114 | return nPads; |
115 | }//Pad2ClosePads() | |
116 | //__________________________________________________________________________________________________ | |
3582c1f9 | 117 | Int_t AliRICHParam::Loc2Sec(TVector2 &x2) |
118 | { | |
119 | // Determines sector containing the given point and trasform this point to the local system of that sector. | |
120 | // Returns sector code: 1 2 3 | |
121 | // 4 5 6 | |
c712cb2f | 122 | Int_t sector=kBad; |
3582c1f9 | 123 | Double_t p1=-0.5*PcSizeX(); Double_t p2=-0.5*SectorSizeX()-DeadZone(); Double_t p3=-0.5*SectorSizeX(); |
124 | Double_t p4= 0.5*SectorSizeX(); Double_t p5= 0.5*SectorSizeX()+DeadZone(); Double_t p6= 0.5*PcSizeX(); | |
125 | Double_t x,y; | |
126 | if (x2.X()>=p1&&x2.X()<=p2) {sector=1;x=x2.X()+0.5*PcSizeX();} | |
127 | else if(x2.X()>=p3&&x2.X()<=p4) {sector=2;x=x2.X()+0.5*SectorSizeX();} | |
128 | else if(x2.X()>=p5&&x2.X()<=p6) {sector=3;x=x2.X()-0.5*SectorSizeX()-DeadZone();} | |
129 | else {return kBad;} //in dead zone or out of chamber | |
130 | ||
131 | if (x2.Y()>=-0.5*PcSizeY() &&x2.Y()<=-0.5*DeadZone()) {y=x2.Y()+0.5*PcSizeY();sector+=3;} //sectors 4,5,6 | |
132 | else if(x2.Y()> -0.5*DeadZone()&&x2.Y()< 0.5*DeadZone()) {return kBad;} //in dead zone | |
133 | else if(x2.Y()>= 0.5*DeadZone()&&x2.Y()<= 0.5*PcSizeY()) {y=x2.Y()-0.5*DeadZone();} //sectors 1,2,3 | |
134 | else {return kBad;} //out of chamber | |
135 | x2.Set(x,y); | |
136 | return sector; | |
c712cb2f | 137 | }//Loc2Sec(Double_t x, Double_t y) |
c2c6679b | 138 | //__________________________________________________________________________________________________ |
3582c1f9 | 139 | Int_t AliRICHParam::Loc2Pad(TVector2 x2,Int_t &padx,Int_t &pady) |
140 | { | |
141 | // Determines pad number (padx,pady) containing the given point x2 defined the chamber RS. | |
142 | // Pad count starts in lower left corner from 1,1 to 144,160 in upper right corner of a chamber. | |
143 | // Returns sector number of the determined pad. | |
144 | Int_t sector=Loc2Sec(x2);//trasforms x2 to sector reference system | |
145 | if(sector==kBad) {padx=pady=kBad; return sector;} | |
146 | ||
147 | padx=Int_t(x2.X()/PadSizeX())+1; if(padx>NpadsXsec()) padx= NpadsXsec(); | |
148 | if(sector==2||sector==5) padx+= NpadsXsec(); // 1 2 3 | |
149 | if(sector==3||sector==6) padx+=2*NpadsXsec(); // 4 5 6 | |
150 | ||
151 | pady=Int_t(x2.Y()/PadSizeY())+1; if(pady>NpadsYsec()) pady= NpadsYsec(); | |
152 | if(sector<4) pady+=NpadsYsec(); | |
153 | return sector; | |
154 | } | |
155 | //__________________________________________________________________________________________________ | |
c712cb2f | 156 | Int_t AliRICHParam::Pad2Sec(Int_t &padx, Int_t &pady) |
3582c1f9 | 157 | { |
158 | // Determines sector containing the given pad (padx,pady) and trasform it to the local RS of that sector. | |
c712cb2f | 159 | Int_t sector=kBad; |
160 | if (padx>=1 &&padx<=NpadsXsec()) {sector=1;} | |
161 | else if(padx> NpadsXsec() &&padx<=NpadsXsec()*2) {sector=2;padx-=NpadsXsec();} | |
162 | else if(padx> NpadsXsec()*2&&padx<=NpadsX()) {sector=3;padx-=NpadsXsec()*2;} | |
163 | else {return kBad;} | |
164 | ||
3582c1f9 | 165 | if (pady>=1 &&pady<=NpadsYsec()) {return sector+3;} |
166 | else if(pady>NpadsYsec() &&pady<=NpadsY()) {pady-=NpadsYsec();return sector;} | |
167 | else {return kBad;} | |
c712cb2f | 168 | }//Pad2Sec() |
169 | //__________________________________________________________________________________________________ | |
3582c1f9 | 170 | TVector2 AliRICHParam::Pad2Loc(Int_t padx,Int_t pady) |
c712cb2f | 171 | { |
3582c1f9 | 172 | // Returns position of the center of the given pad (padx,pady) in local RS of the chamber |
173 | Int_t sector=Pad2Sec(padx,pady);//shifts to sector RS | |
174 | if(sector==kBad) return TVector2(-101,-101); | |
175 | Double_t x,y; | |
176 | if(sector<=3) | |
177 | y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY(); // 1 2 3 | |
178 | else{ // 4 5 6 | |
c712cb2f | 179 | y=-0.5*PcSizeY()+pady*PadSizeY()-0.5*PadSizeY(); |
180 | } | |
c1863e3c | 181 | if(sector==1||sector==4) |
c712cb2f | 182 | x=-0.5*PcSizeX()+padx*PadSizeX()-0.5*PadSizeX(); |
c1863e3c | 183 | else if(sector==2||sector==5) |
c712cb2f | 184 | x=-0.5*SectorSizeX()+padx*PadSizeX()-0.5*PadSizeX(); |
c2c6679b | 185 | else |
c712cb2f | 186 | x= 0.5*SectorSizeX()+DeadZone()+padx*PadSizeX()-0.5*PadSizeX(); |
3582c1f9 | 187 | return TVector2(x,y); |
188 | } | |
c60862bf | 189 | //__________________________________________________________________________________________________ |
3582c1f9 | 190 | Double_t AliRICHParam::GainSag(Double_t y,Int_t sector) |
c60862bf | 191 | { |
3582c1f9 | 192 | // Returns % of gain variation due to wire sagita. |
193 | // All cureves are parametrized per sector basis, so y must be scaled to the Sector RS. | |
194 | if(y>0) y-=SectorSizeY()/2; else y+=SectorSizeY()/2; | |
195 | switch(HV(sector)){ | |
196 | 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;//% | |
197 | 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; | |
198 | 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; | |
199 | 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; | |
200 | default: return 0; | |
201 | } | |
c712cb2f | 202 | } |
203 | //__________________________________________________________________________________________________ | |
3582c1f9 | 204 | Double_t AliRICHParam::QdcSlope(Int_t sec) |
205 | { | |
206 | // Returns number of QDC channels per single electron at the unknown yet ???? point for a given sector | |
207 | switch(sec){ | |
208 | case kBad: return 0; | |
209 | default: return 27; | |
c712cb2f | 210 | } |
543d5224 | 211 | } |
c2c6679b | 212 | //__________________________________________________________________________________________________ |
3582c1f9 | 213 | Double_t AliRICHParam::Gain(TVector2 x2) |
214 | { | |
215 | // | |
216 | if(IsWireSag()) | |
217 | return QdcSlope(Sector(x2))*(1+GainSag(x2.Y(),Sector(x2))/100); | |
218 | else | |
219 | return QdcSlope(Sector(x2)); | |
220 | } | |
221 | //__________________________________________________________________________________________________ | |
222 | Int_t AliRICHParam::TotQdc(TVector2 x2,Double_t eloss) | |
223 | { | |
224 | // Calculates the total charge produced by the eloss in point x2 (Chamber RS). | |
225 | // Returns this change parametrised in QDC channels. | |
226 | // eloss=0 means photons which provided for only 1 electron | |
227 | // eloss > 0 for Mip | |
228 | Int_t iNelectrons=Int_t(eloss/IonisationPotential()); if(iNelectrons==0) iNelectrons=1; | |
229 | Double_t qdc=0; | |
230 | for(Int_t i=1;i<=iNelectrons;i++) qdc+=-Gain(x2)*TMath::Log(gRandom->Rndm()); | |
231 | return Int_t(qdc); | |
232 | } | |
233 | //__________________________________________________________________________________________________ | |
234 | Double_t AliRICHParam::FracQdc(TVector2 x2,Int_t padx,Int_t pady) | |
235 | { | |
236 | // Calculates the charge fraction for a given pad (padx,pady) from the given hit point. | |
237 | // Mathieson distribution integrated is used. | |
238 | TVector2 center2=Pad2Loc(padx,pady);//gives center of requested pad | |
239 | Double_t normXmin=(x2.X()-center2.X()-PadSizeX()/2) /AnodeCathodeGap(); | |
240 | Double_t normXmax=(x2.X()-center2.X()+PadSizeX()/2) /AnodeCathodeGap(); | |
241 | Double_t normYmin=(x2.Y()-center2.Y()-PadSizeY()/2) /AnodeCathodeGap(); | |
242 | Double_t normYmax=(x2.Y()-center2.Y()+PadSizeY()/2) /AnodeCathodeGap(); | |
c712cb2f | 243 | |
3582c1f9 | 244 | if(Sector(x2)!=Sector(padx,pady)) return 0;//requested pad does not belong to the sector of given point |
245 | else return Mathieson(normXmin, normYmin, normXmax, normYmax); | |
246 | } | |
c712cb2f | 247 | //__________________________________________________________________________________________________ |
9d6f9427 | 248 | Double_t AliRICHParam::Mathieson(Double_t xMin,Double_t yMin,Double_t xMax,Double_t yMax) |
3582c1f9 | 249 | { |
250 | // All arguments are parametrised according to NIM A370(1988)602-603 | |
251 | // Returns a charge fraction. | |
53fd478b | 252 | const Double_t kSqrtKx3=0.77459667;const Double_t kX2=0.962;const Double_t kX4=0.379; |
253 | const Double_t kSqrtKy3=0.77459667;const Double_t kY2=0.962;const Double_t kY4=0.379; | |
c712cb2f | 254 | |
53fd478b | 255 | Double_t ux1=kSqrtKx3*TMath::TanH(kX2*xMin); |
256 | Double_t ux2=kSqrtKx3*TMath::TanH(kX2*xMax); | |
257 | Double_t uy1=kSqrtKy3*TMath::TanH(kY2*yMin); | |
258 | Double_t uy2=kSqrtKy3*TMath::TanH(kY2*yMax); | |
259 | return 4*kX4*(TMath::ATan(ux2)-TMath::ATan(ux1))*kY4*(TMath::ATan(uy2)-TMath::ATan(uy1)); | |
c712cb2f | 260 | } |
261 | //__________________________________________________________________________________________________ | |
3582c1f9 | 262 | void AliRICHParam::Loc2Area(TVector2 x2,Int_t &iPadXmin,Int_t &iPadYmin,Int_t &iPadXmax,Int_t &iPadYmax) |
263 | { | |
264 | // Calculates the area of disintegration for a given point. It's assumed here that this points lays on anode wire. | |
265 | // Area is a rectangulare set of pads defined by its left-down and right-up coners. | |
266 | Loc2Pad(x2-MathiesonDelta(),iPadXmin,iPadYmin); | |
267 | Loc2Pad(x2+MathiesonDelta(),iPadXmax,iPadYmax); | |
268 | } | |
08479a10 | 269 | //__________________________________________________________________________________________________ |
3582c1f9 | 270 | Bool_t AliRICHParam::IsOverTh(Int_t c,Int_t x,Int_t y,Double_t q) |
271 | { | |
272 | // Calculate the new charge subtracting pedestal and if the current digit is over threshold | |
273 | if(q>NsigmaTh()*fSigmaThMap[c-1][x-1][y-1]) return kTRUE; else return kFALSE; | |
274 | } | |
275 | //__________________________________________________________________________________________________ | |
276 | TVector2 AliRICHParam::ShiftToWirePos(TVector2 x2) | |
277 | { | |
278 | // Calculate the position of the wire nearest to the hit | |
279 | Int_t padx,pady; | |
280 | Loc2Pad(x2,padx,pady); | |
281 | Double_t x; | |
282 | TVector2 center2=Pad2Loc(padx,pady); | |
283 | if(x2.X()>center2.X()) x=center2.X()+0.5*WirePitch(); | |
284 | else x=center2.X()-0.5*WirePitch(); | |
285 | x2.Set(x,x2.Y()); | |
286 | return x2; | |
287 | } | |
d48cca74 | 288 | #endif //AliRICHParam_h |