]>
Commit | Line | Data |
---|---|---|
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> |
f037571e | 8 | #include <TError.h> |
9e23b054 | 9 | |
ed3ceb24 | 10 | |
11 | static const int kNCH=7; //number of RICH chambers | |
12 | static const int kNpadsX = 144; //number of pads along X in single chamber | |
13 | static const int kNpadsY = 160; //number of pads along Y in single chamber | |
14 | static const int kBad=-101; //useful static const to mark initial (uninitalised) values | |
3582c1f9 | 15 | static const int kNsectors=6; // nb. of sectors per chamber |
ed3ceb24 | 16 | |
17 | static const int kadc_satm = 4096; //dynamic range (10 bits) | |
18 | static const int kCerenkov=50000050; //??? go to something more general like TPDGCode | |
19 | static const int kFeedback=50000051; //??? go to something more general like TPDGCode | |
20 | ||
21 | ||
d48cca74 | 22 | class AliRICHParam :public TObject |
23 | { | |
24 | public: | |
c712cb2f | 25 | AliRICHParam() {;} |
08479a10 | 26 | virtual ~AliRICHParam() {;} |
3582c1f9 | 27 | static const Int_t NpadsX() {return kNpadsX;} //pads along X in chamber |
28 | static const Int_t NpadsY() {return kNpadsY;} //pads along Y in chamber | |
29 | static Int_t NpadsXsec() {return NpadsX()/3;} //pads along X in sector | |
30 | static Int_t NpadsYsec() {return NpadsY()/2;} //pads along Y in sector | |
31 | static Double_t DeadZone() {return 2.6;} //dead zone size in cm | |
32 | static Double_t PadSizeX() {return 0.84;} //pad size x in cm | |
33 | static Double_t PadSizeY() {return 0.8;} //pad size y in cm | |
34 | static Double_t SectorSizeX() {return NpadsX()*PadSizeX()/3;} //sector size x in cm | |
35 | static Double_t SectorSizeY() {return NpadsY()*PadSizeY()/2;} //sector size y in cm | |
36 | static Double_t PcSizeX() {return NpadsX()*PadSizeX()+2*DeadZone();} //photocathode size x in cm | |
37 | static Double_t PcSizeY() {return NpadsY()*PadSizeY()+DeadZone();} //photocathode size y in cm | |
38 | static Double_t WirePitch() {return PadSizeX()/2;} //distance between anode wires | |
c712cb2f | 39 | static Double_t SizeX() {return 132.6;} |
40 | static Double_t SizeY() {return 26;} | |
3582c1f9 | 41 | static Double_t SizeZ() {return 136.7;} |
42 | static Double_t Offset() {return 490+1.267;} //distance from IP to center of chamber in cm | |
43 | static Double_t AngleYZ() {return 19.5*TMath::DegToRad();} //angle between chambers in YZ plane, rad | |
44 | static Double_t AngleXY() {return 20*TMath::DegToRad();} //angle between chambers in XY plane, rad | |
45 | static Double_t AngleRot() {return fgAngleRot*TMath::DegToRad();} //RICH rotation around Z, rad | |
c712cb2f | 46 | static Double_t FreonThickness() {return 1.5;} |
47 | static Double_t QuartzThickness() {return 0.5;} | |
48 | static Double_t GapThickness() {return 8.0;} | |
49 | static Double_t RadiatorToPads() {return FreonThickness()+QuartzThickness()+GapThickness();} | |
3582c1f9 | 50 | static Double_t ProximityGap() {return 0.445;} |
c712cb2f | 51 | static Double_t AnodeCathodeGap() {return 0.2;} |
52 | static Double_t QuartzLength() {return 133;} | |
53 | static Double_t QuartzWidth() {return 127.9;} | |
54 | static Double_t OuterFreonLength() {return 133;} | |
55 | static Double_t OuterFreonWidth() {return 41.3;} | |
56 | static Double_t InnerFreonLength() {return 133;} | |
57 | static Double_t InnerFreonWidth() {return 41.3;} | |
58 | static Double_t IonisationPotential() {return 26.0e-9;} | |
3582c1f9 | 59 | static TVector2 MathiesonDelta() {return TVector2(5*0.18,5*0.18);} |
c712cb2f | 60 | static Int_t MaxQdc() {return 4095;} |
c712cb2f | 61 | static Double_t AlphaFeedback(Int_t sec) {HV(sec);return 0.036;} |
853634d3 | 62 | |
3582c1f9 | 63 | static Bool_t IsResolveClusters() {return fgIsResolveClusters;} //go after resolved clusters? |
64 | static Bool_t IsWireSag() {return fgIsWireSag;} //take wire sagita in account? | |
f037571e | 65 | static Int_t HV(Int_t sector) { |
66 | if (sector>=1 && sector <=6) | |
67 | return fgHV[sector-1]; | |
68 | else { | |
69 | ::Error("HV","Wrong sector %d",sector); | |
70 | return kBad; | |
71 | } | |
72 | } //high voltage for this sector | |
3582c1f9 | 73 | static void IsResolveClusters(Bool_t a) {fgIsResolveClusters=a;} |
74 | static void SetWireSag(Bool_t status) {fgIsWireSag=status;} | |
75 | static void SetHV(Int_t sector,Int_t hv){fgHV[sector-1]=hv;} | |
76 | static void SetAngleRot(Double_t rot) {fgAngleRot =rot;} | |
c712cb2f | 77 | |
3582c1f9 | 78 | inline static void Loc2Area(TVector2 x2,Int_t &padxMin,Int_t &padyMin,Int_t &padxMax,Int_t &padyMax); // |
79 | inline static Int_t Loc2Pad(TVector2 x2,Int_t &padx,Int_t &pady); //return sector and pad | |
80 | inline static TVector2 Pad2Loc(Int_t padx,Int_t pady); //return center of the pad | |
81 | static Int_t Sector(Int_t padx,Int_t pady) {return Pad2Sec(padx,pady);} //sector of this pad | |
82 | static Int_t Sector(TVector2 x2) {int x,y;return Loc2Pad(x2,x,y);} //sector of this point | |
83 | 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 | |
84 | inline static TVector2 ShiftToWirePos(TVector2 x2); //shift to the nearest wire | |
543d5224 | 85 | |
3582c1f9 | 86 | inline static Double_t Mathieson(Double_t lx1,Double_t lx2,Double_t ly1,Double_t ly2); //Mathienson integral over these limits |
87 | inline static Double_t GainSag(Double_t y,Int_t sector); //gain variations in % | |
88 | inline static Double_t QdcSlope(Int_t sec); //weight of electon in QDC channels | |
89 | inline static Double_t Gain(TVector2 x2); //gain for point in ChRS | |
90 | inline static Double_t FracQdc(TVector2 x2,Int_t padx,Int_t pady); //charge fraction to pad from hit | |
91 | inline static Int_t TotQdc(TVector2 x2,Double_t eloss); //total charge for hit eloss=0 for photons | |
92 | inline Bool_t IsOverTh(Int_t iChamber, Int_t x, Int_t y, Double_t q); // | |
93 | static Int_t NsigmaTh() {return fgNsigmaTh;} // | |
94 | static Float_t SigmaThMean() {return fgSigmaThMean;} // | |
95 | static Float_t SigmaThSpread() {return fgSigmaThSpread;} // | |
96 | void GenSigmaThMap(); //generate pedestal map | |
97 | static void Print(); | |
d48cca74 | 98 | protected: |
3582c1f9 | 99 | inline static Int_t Loc2Sec(TVector2 &x2); //return sector, x2->Sector RS |
100 | inline static Int_t Pad2Sec(Int_t &padx,Int_t &pady); //return sector, (padx,pady)->Sector RS | |
101 | static Bool_t fgIsWireSag; //is wire sagitta taken into account | |
102 | static Bool_t fgIsResolveClusters; //performs declustering or not | |
103 | static Int_t fgHV[6]; //HV applied to anod wires | |
104 | static Double_t fgAngleRot; //rotation of RICH from up postion (0,0,490)cm | |
105 | static Float_t fSigmaThMap[kNCH][kNpadsX][kNpadsY]; //sigma of the pedestal distributions for all pads | |
106 | static Int_t fgNsigmaTh; //n. of sigmas to cut for zero suppression | |
107 | static Float_t fgSigmaThMean; //sigma threshold value | |
108 | static Float_t fgSigmaThSpread; //spread of sigma | |
c712cb2f | 109 | ClassDef(AliRICHParam,4) //RICH main parameters |
d48cca74 | 110 | }; |
c2c6679b | 111 | //__________________________________________________________________________________________________ |
c712cb2f | 112 | Int_t AliRICHParam::PadNeighbours(Int_t iPadX,Int_t iPadY,Int_t listX[4],Int_t listY[4]) |
113 | { | |
3582c1f9 | 114 | // Determines all the neighbouring pads for the given one. Returns total amount of these pads. |
115 | // Dead zones are taken into account. | |
c712cb2f | 116 | Int_t nPads=0; |
ed3ceb24 | 117 | if(iPadY!=NpadsY()&&iPadY!=NpadsYsec()) {listX[nPads]=iPadX; listY[nPads]=iPadY+1; nPads++;} |
118 | if(iPadX!=NpadsXsec()&&iPadX!=2*NpadsXsec()&&iPadX!=NpadsX()){listX[nPads]=iPadX+1; listY[nPads]=iPadY; nPads++;} | |
119 | if(iPadY!=1&&iPadY!=NpadsYsec()+1) {listX[nPads]=iPadX; listY[nPads]=iPadY-1; nPads++;} | |
120 | if(iPadX!=1&&iPadX!=NpadsXsec()+1&&iPadX!=2*NpadsXsec()+1) {listX[nPads]=iPadX-1; listY[nPads]=iPadY; nPads++;} | |
121 | ||
c712cb2f | 122 | return nPads; |
123 | }//Pad2ClosePads() | |
124 | //__________________________________________________________________________________________________ | |
3582c1f9 | 125 | Int_t AliRICHParam::Loc2Sec(TVector2 &x2) |
126 | { | |
127 | // Determines sector containing the given point and trasform this point to the local system of that sector. | |
128 | // Returns sector code: 1 2 3 | |
129 | // 4 5 6 | |
c712cb2f | 130 | Int_t sector=kBad; |
3582c1f9 | 131 | Double_t p1=-0.5*PcSizeX(); Double_t p2=-0.5*SectorSizeX()-DeadZone(); Double_t p3=-0.5*SectorSizeX(); |
132 | Double_t p4= 0.5*SectorSizeX(); Double_t p5= 0.5*SectorSizeX()+DeadZone(); Double_t p6= 0.5*PcSizeX(); | |
133 | Double_t x,y; | |
134 | if (x2.X()>=p1&&x2.X()<=p2) {sector=1;x=x2.X()+0.5*PcSizeX();} | |
135 | else if(x2.X()>=p3&&x2.X()<=p4) {sector=2;x=x2.X()+0.5*SectorSizeX();} | |
136 | else if(x2.X()>=p5&&x2.X()<=p6) {sector=3;x=x2.X()-0.5*SectorSizeX()-DeadZone();} | |
137 | else {return kBad;} //in dead zone or out of chamber | |
138 | ||
139 | if (x2.Y()>=-0.5*PcSizeY() &&x2.Y()<=-0.5*DeadZone()) {y=x2.Y()+0.5*PcSizeY();sector+=3;} //sectors 4,5,6 | |
140 | else if(x2.Y()> -0.5*DeadZone()&&x2.Y()< 0.5*DeadZone()) {return kBad;} //in dead zone | |
141 | else if(x2.Y()>= 0.5*DeadZone()&&x2.Y()<= 0.5*PcSizeY()) {y=x2.Y()-0.5*DeadZone();} //sectors 1,2,3 | |
142 | else {return kBad;} //out of chamber | |
143 | x2.Set(x,y); | |
144 | return sector; | |
c712cb2f | 145 | }//Loc2Sec(Double_t x, Double_t y) |
c2c6679b | 146 | //__________________________________________________________________________________________________ |
3582c1f9 | 147 | Int_t AliRICHParam::Loc2Pad(TVector2 x2,Int_t &padx,Int_t &pady) |
148 | { | |
149 | // Determines pad number (padx,pady) containing the given point x2 defined the chamber RS. | |
150 | // Pad count starts in lower left corner from 1,1 to 144,160 in upper right corner of a chamber. | |
151 | // Returns sector number of the determined pad. | |
152 | Int_t sector=Loc2Sec(x2);//trasforms x2 to sector reference system | |
153 | if(sector==kBad) {padx=pady=kBad; return sector;} | |
154 | ||
155 | padx=Int_t(x2.X()/PadSizeX())+1; if(padx>NpadsXsec()) padx= NpadsXsec(); | |
156 | if(sector==2||sector==5) padx+= NpadsXsec(); // 1 2 3 | |
157 | if(sector==3||sector==6) padx+=2*NpadsXsec(); // 4 5 6 | |
158 | ||
159 | pady=Int_t(x2.Y()/PadSizeY())+1; if(pady>NpadsYsec()) pady= NpadsYsec(); | |
160 | if(sector<4) pady+=NpadsYsec(); | |
161 | return sector; | |
162 | } | |
163 | //__________________________________________________________________________________________________ | |
c712cb2f | 164 | Int_t AliRICHParam::Pad2Sec(Int_t &padx, Int_t &pady) |
3582c1f9 | 165 | { |
166 | // Determines sector containing the given pad (padx,pady) and trasform it to the local RS of that sector. | |
c712cb2f | 167 | Int_t sector=kBad; |
168 | if (padx>=1 &&padx<=NpadsXsec()) {sector=1;} | |
169 | else if(padx> NpadsXsec() &&padx<=NpadsXsec()*2) {sector=2;padx-=NpadsXsec();} | |
170 | else if(padx> NpadsXsec()*2&&padx<=NpadsX()) {sector=3;padx-=NpadsXsec()*2;} | |
171 | else {return kBad;} | |
172 | ||
3582c1f9 | 173 | if (pady>=1 &&pady<=NpadsYsec()) {return sector+3;} |
174 | else if(pady>NpadsYsec() &&pady<=NpadsY()) {pady-=NpadsYsec();return sector;} | |
175 | else {return kBad;} | |
c712cb2f | 176 | }//Pad2Sec() |
177 | //__________________________________________________________________________________________________ | |
3582c1f9 | 178 | TVector2 AliRICHParam::Pad2Loc(Int_t padx,Int_t pady) |
c712cb2f | 179 | { |
3582c1f9 | 180 | // Returns position of the center of the given pad (padx,pady) in local RS of the chamber |
181 | Int_t sector=Pad2Sec(padx,pady);//shifts to sector RS | |
182 | if(sector==kBad) return TVector2(-101,-101); | |
183 | Double_t x,y; | |
184 | if(sector<=3) | |
185 | y=0.5*DeadZone()+pady*PadSizeY()-0.5*PadSizeY(); // 1 2 3 | |
186 | else{ // 4 5 6 | |
c712cb2f | 187 | y=-0.5*PcSizeY()+pady*PadSizeY()-0.5*PadSizeY(); |
188 | } | |
c1863e3c | 189 | if(sector==1||sector==4) |
c712cb2f | 190 | x=-0.5*PcSizeX()+padx*PadSizeX()-0.5*PadSizeX(); |
c1863e3c | 191 | else if(sector==2||sector==5) |
c712cb2f | 192 | x=-0.5*SectorSizeX()+padx*PadSizeX()-0.5*PadSizeX(); |
c2c6679b | 193 | else |
c712cb2f | 194 | x= 0.5*SectorSizeX()+DeadZone()+padx*PadSizeX()-0.5*PadSizeX(); |
3582c1f9 | 195 | return TVector2(x,y); |
196 | } | |
c60862bf | 197 | //__________________________________________________________________________________________________ |
3582c1f9 | 198 | Double_t AliRICHParam::GainSag(Double_t y,Int_t sector) |
c60862bf | 199 | { |
3582c1f9 | 200 | // Returns % of gain variation due to wire sagita. |
201 | // All cureves are parametrized per sector basis, so y must be scaled to the Sector RS. | |
202 | if(y>0) y-=SectorSizeY()/2; else y+=SectorSizeY()/2; | |
203 | switch(HV(sector)){ | |
204 | 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;//% | |
205 | 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; | |
206 | 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; | |
207 | 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; | |
208 | default: return 0; | |
209 | } | |
c712cb2f | 210 | } |
211 | //__________________________________________________________________________________________________ | |
3582c1f9 | 212 | Double_t AliRICHParam::QdcSlope(Int_t sec) |
213 | { | |
214 | // Returns number of QDC channels per single electron at the unknown yet ???? point for a given sector | |
215 | switch(sec){ | |
216 | case kBad: return 0; | |
217 | default: return 27; | |
c712cb2f | 218 | } |
543d5224 | 219 | } |
c2c6679b | 220 | //__________________________________________________________________________________________________ |
3582c1f9 | 221 | Double_t AliRICHParam::Gain(TVector2 x2) |
222 | { | |
223 | // | |
224 | if(IsWireSag()) | |
225 | return QdcSlope(Sector(x2))*(1+GainSag(x2.Y(),Sector(x2))/100); | |
226 | else | |
227 | return QdcSlope(Sector(x2)); | |
228 | } | |
229 | //__________________________________________________________________________________________________ | |
230 | Int_t AliRICHParam::TotQdc(TVector2 x2,Double_t eloss) | |
231 | { | |
232 | // Calculates the total charge produced by the eloss in point x2 (Chamber RS). | |
233 | // Returns this change parametrised in QDC channels. | |
234 | // eloss=0 means photons which provided for only 1 electron | |
09c52ebc | 235 | // eloss > 0 for Mip |
236 | if(Sector(x2)==kBad) return 0; //hit in the dead zone | |
3582c1f9 | 237 | Int_t iNelectrons=Int_t(eloss/IonisationPotential()); if(iNelectrons==0) iNelectrons=1; |
238 | Double_t qdc=0; | |
239 | for(Int_t i=1;i<=iNelectrons;i++) qdc+=-Gain(x2)*TMath::Log(gRandom->Rndm()); | |
240 | return Int_t(qdc); | |
241 | } | |
242 | //__________________________________________________________________________________________________ | |
243 | Double_t AliRICHParam::FracQdc(TVector2 x2,Int_t padx,Int_t pady) | |
244 | { | |
245 | // Calculates the charge fraction for a given pad (padx,pady) from the given hit point. | |
246 | // Mathieson distribution integrated is used. | |
247 | TVector2 center2=Pad2Loc(padx,pady);//gives center of requested pad | |
248 | Double_t normXmin=(x2.X()-center2.X()-PadSizeX()/2) /AnodeCathodeGap(); | |
249 | Double_t normXmax=(x2.X()-center2.X()+PadSizeX()/2) /AnodeCathodeGap(); | |
250 | Double_t normYmin=(x2.Y()-center2.Y()-PadSizeY()/2) /AnodeCathodeGap(); | |
251 | Double_t normYmax=(x2.Y()-center2.Y()+PadSizeY()/2) /AnodeCathodeGap(); | |
c712cb2f | 252 | |
3582c1f9 | 253 | if(Sector(x2)!=Sector(padx,pady)) return 0;//requested pad does not belong to the sector of given point |
254 | else return Mathieson(normXmin, normYmin, normXmax, normYmax); | |
255 | } | |
c712cb2f | 256 | //__________________________________________________________________________________________________ |
9d6f9427 | 257 | Double_t AliRICHParam::Mathieson(Double_t xMin,Double_t yMin,Double_t xMax,Double_t yMax) |
3582c1f9 | 258 | { |
259 | // All arguments are parametrised according to NIM A370(1988)602-603 | |
260 | // Returns a charge fraction. | |
53fd478b | 261 | const Double_t kSqrtKx3=0.77459667;const Double_t kX2=0.962;const Double_t kX4=0.379; |
262 | const Double_t kSqrtKy3=0.77459667;const Double_t kY2=0.962;const Double_t kY4=0.379; | |
c712cb2f | 263 | |
53fd478b | 264 | Double_t ux1=kSqrtKx3*TMath::TanH(kX2*xMin); |
265 | Double_t ux2=kSqrtKx3*TMath::TanH(kX2*xMax); | |
266 | Double_t uy1=kSqrtKy3*TMath::TanH(kY2*yMin); | |
267 | Double_t uy2=kSqrtKy3*TMath::TanH(kY2*yMax); | |
268 | return 4*kX4*(TMath::ATan(ux2)-TMath::ATan(ux1))*kY4*(TMath::ATan(uy2)-TMath::ATan(uy1)); | |
c712cb2f | 269 | } |
270 | //__________________________________________________________________________________________________ | |
3582c1f9 | 271 | void AliRICHParam::Loc2Area(TVector2 x2,Int_t &iPadXmin,Int_t &iPadYmin,Int_t &iPadXmax,Int_t &iPadYmax) |
272 | { | |
273 | // Calculates the area of disintegration for a given point. It's assumed here that this points lays on anode wire. | |
274 | // Area is a rectangulare set of pads defined by its left-down and right-up coners. | |
275 | Loc2Pad(x2-MathiesonDelta(),iPadXmin,iPadYmin); | |
276 | Loc2Pad(x2+MathiesonDelta(),iPadXmax,iPadYmax); | |
277 | } | |
08479a10 | 278 | //__________________________________________________________________________________________________ |
3582c1f9 | 279 | Bool_t AliRICHParam::IsOverTh(Int_t c,Int_t x,Int_t y,Double_t q) |
280 | { | |
281 | // Calculate the new charge subtracting pedestal and if the current digit is over threshold | |
282 | if(q>NsigmaTh()*fSigmaThMap[c-1][x-1][y-1]) return kTRUE; else return kFALSE; | |
283 | } | |
284 | //__________________________________________________________________________________________________ | |
285 | TVector2 AliRICHParam::ShiftToWirePos(TVector2 x2) | |
286 | { | |
287 | // Calculate the position of the wire nearest to the hit | |
288 | Int_t padx,pady; | |
289 | Loc2Pad(x2,padx,pady); | |
290 | Double_t x; | |
291 | TVector2 center2=Pad2Loc(padx,pady); | |
292 | if(x2.X()>center2.X()) x=center2.X()+0.5*WirePitch(); | |
293 | else x=center2.X()-0.5*WirePitch(); | |
294 | x2.Set(x,x2.Y()); | |
295 | return x2; | |
296 | } | |
d48cca74 | 297 | #endif //AliRICHParam_h |