1 // **************************************************************************
2 // * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 // * Author: The ALICE Off-line Project. *
5 // * Contributors are mentioned in the code where appropriate. *
7 // * Permission to use, copy, modify and distribute this software and its *
8 // * documentation strictly for non-commercial purposes is hereby granted *
9 // * without fee, provided that the above copyright notice appears in all *
10 // * copies and that both the copyright notice and this permission notice *
11 // * appear in the supporting documentation. The authors make no claims *
12 // * about the suitability of this software for any purpose. It is *
13 // * provided "as is" without express or implied warranty. *
14 // **************************************************************************
15 #include "AliHMPIDParam.h" //class header
16 #include "AliHMPIDDigit.h" //ctor
17 #include "AliLog.h" //general
18 #include <AliRunLoader.h> //Stack()
19 #include <AliStack.h> //Stack()
20 #include <TLatex.h> //TestTrans()
21 #include <TView.h> //TestTrans()
22 #include <TPolyMarker3D.h> //TestTrans()
23 #include <TRotation.h>
24 #include <TParticle.h> //Stack()
25 #include <TGeoPhysicalNode.h> //ctor
27 ClassImp(AliHMPIDParam)
30 Float_t AliHMPIDParam::fgkMinPcX[]={0.,0.,0.,0.,0.,0.};
31 Float_t AliHMPIDParam::fgkMaxPcX[]={0.,0.,0.,0.,0.,0.};
32 Float_t AliHMPIDParam::fgkMinPcY[]={0.,0.,0.,0.,0.,0.};
33 Float_t AliHMPIDParam::fgkMaxPcY[]={0.,0.,0.,0.,0.,0.};
35 Float_t AliHMPIDParam::fgCellX=0.;
36 Float_t AliHMPIDParam::fgCellY=0.;
38 Float_t AliHMPIDParam::fgPcX=0;
39 Float_t AliHMPIDParam::fgPcY=0;
41 Float_t AliHMPIDParam::fgAllX=0;
42 Float_t AliHMPIDParam::fgAllY=0;
44 Bool_t AliHMPIDParam::fgInstanceType=kTRUE;
46 AliHMPIDParam* AliHMPIDParam::fgInstance=0x0; //singleton pointer
48 Int_t AliHMPIDParam::fgSigmas=4;
50 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
51 AliHMPIDParam::AliHMPIDParam(Bool_t noGeo=kFALSE):TNamed("HmpidParam","default version")
53 // Here all the intitializition is taken place when AliHMPIDParam::Instance() is invoked for the first time.
54 // In particular, matrices to be used for LORS<->MARS trasnformations are initialized from TGeo structure.
55 // Note that TGeoManager should be already initialized from geometry.root file
58 fRadNmean = MeanIdxRad(); //initialization of the running ref. index of freon
60 Float_t dead=2.6;// cm of the dead zones between PCs-> See 2CRC2099P1
63 if(noGeo==kTRUE) fgInstanceType=kFALSE; //instance from ideal geometry, no actual geom is present
65 if(noGeo==kFALSE && !gGeoManager)
67 TGeoManager::Import("geometry.root");
68 if(!gGeoManager) AliFatal("!!!!!!No geometry loaded!!!!!!!");
71 fgCellX=0.8;fgCellY=0.84;
74 TGeoVolume *pCellVol = gGeoManager->GetVolume("Hcel");
76 TGeoBBox *bcell = (TGeoBBox *)pCellVol->GetShape();
77 fgCellX=2.*bcell->GetDX(); fgCellY = 2.*bcell->GetDY(); // overwrite the values with the read ones
80 fgPcX=80.*fgCellX; fgPcY = 48.*fgCellY;
82 fgAllY=3.*fgPcY+2.*dead;
84 fgkMinPcX[1]=fgPcX+dead; fgkMinPcX[3]=fgkMinPcX[1]; fgkMinPcX[5]=fgkMinPcX[3];
85 fgkMaxPcX[0]=fgPcX; fgkMaxPcX[2]=fgkMaxPcX[0]; fgkMaxPcX[4]=fgkMaxPcX[2];
86 fgkMaxPcX[1]=fgAllX; fgkMaxPcX[3]=fgkMaxPcX[1]; fgkMaxPcX[5]=fgkMaxPcX[3];
88 fgkMinPcY[2]=fgPcY+dead; fgkMinPcY[3]=fgkMinPcY[2];
89 fgkMinPcY[4]=2.*fgPcY+2.*dead; fgkMinPcY[5]=fgkMinPcY[4];
90 fgkMaxPcY[0]=fgPcY; fgkMaxPcY[1]=fgkMaxPcY[0];
91 fgkMaxPcY[2]=2.*fgPcY+dead; fgkMaxPcY[3]=fgkMaxPcY[2];
92 fgkMaxPcY[4]=fgAllY; fgkMaxPcY[5]=fgkMaxPcY[4];
97 for(Int_t i=kMinCh;i<=kMaxCh;i++)
98 if(gGeoManager && gGeoManager->IsClosed()) {
99 TGeoPNEntry* pne = gGeoManager->GetAlignableEntry(Form("/HMPID/Chamber%i",i));
101 AliErrorClass(Form("The symbolic volume %s does not correspond to any physical entry!",Form("HMPID_%i",i)));
102 fM[i]=new TGeoHMatrix;
103 IdealPosition(i,fM[i]);
105 TGeoPhysicalNode *pnode = pne->GetPhysicalNode();
106 if(pnode) fM[i]=new TGeoHMatrix(*(pnode->GetMatrix()));
108 fM[i]=new TGeoHMatrix;
109 IdealPosition(i,fM[i]);
113 fM[i]=new TGeoHMatrix;
114 IdealPosition(i,fM[i]);
118 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
119 void AliHMPIDParam::Print(Option_t* opt) const
121 // print some usefull (hopefully) info on some internal guts of HMPID parametrisation
123 for(Int_t i=0;i<7;i++) fM[i]->Print(opt);
125 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
126 void AliHMPIDParam::IdealPosition(Int_t iCh, TGeoHMatrix *pMatrix)
128 // Construct ideal position matrix for a given chamber
129 // Arguments: iCh- chamber ID; pMatrix- pointer to precreated unity matrix where to store the results
131 const Double_t kAngHor=19.5; // horizontal angle between chambers 19.5 grad
132 const Double_t kAngVer=20; // vertical angle between chambers 20 grad
133 const Double_t kAngCom=30; // common HMPID rotation with respect to x axis 30 grad
134 const Double_t kTrans[3]={490,0,0}; // center of the chamber is on window-gap surface
135 pMatrix->RotateY(90); // rotate around y since initial position is in XY plane -> now in YZ plane
136 pMatrix->SetTranslation(kTrans); // now plane in YZ is shifted along x
138 case 0: pMatrix->RotateY(kAngHor); pMatrix->RotateZ(-kAngVer); break; //right and down
139 case 1: pMatrix->RotateZ(-kAngVer); break; //down
140 case 2: pMatrix->RotateY(kAngHor); break; //right
141 case 3: break; //no rotation
142 case 4: pMatrix->RotateY(-kAngHor); break; //left
143 case 5: pMatrix->RotateZ(kAngVer); break; //up
144 case 6: pMatrix->RotateY(-kAngHor); pMatrix->RotateZ(kAngVer); break; //left and up
146 pMatrix->RotateZ(kAngCom); //apply common rotation in XY plane
149 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
150 Int_t AliHMPIDParam::Stack(Int_t evt,Int_t tid)
152 // Prints some useful info from stack
153 // Arguments: evt - event number. if not -1 print info only for that event
154 // tid - track id. if not -1 then print it and all it's mothers if any
155 // Returns: mother tid of the given tid if any
156 AliRunLoader *pAL=AliRunLoader::Open();
157 if(pAL->LoadHeader()) return -1;
158 if(pAL->LoadKinematics()) return -1;
161 Int_t iNevt=pAL->GetNumberOfEvents();
163 for(Int_t iEvt=0;iEvt<iNevt;iEvt++){//events loop
164 if(evt!=-1 && evt!=iEvt) continue; //in case one needs to print the requested event, ignore all others
166 AliStack *pStack=pAL->Stack();
167 if(tid==-1){ //print all tids for this event
168 for(Int_t i=0;i<pStack->GetNtrack();i++) pStack->Particle(i)->Print();
169 Printf("totally %i tracks including %i primaries for event %i out of %i event(s)",
170 pStack->GetNtrack(),pStack->GetNprimary(),iEvt,iNevt);
171 }else{ //print only this tid and it;s mothers
172 if(tid<0 || tid>pStack->GetNtrack()) {Printf("Wrong tid, valid tid range for event %i is 0-%i",iEvt,pStack->GetNtrack());break;}
173 TParticle *pTrack=pStack->Particle(tid); mtid=pTrack->GetFirstMother();
174 TString str=pTrack->GetName();
175 while((tid=pTrack->GetFirstMother()) >= 0){
176 pTrack=pStack->Particle(tid);
177 str+=" from ";str+=pTrack->GetName();
181 pAL->UnloadHeader(); pAL->UnloadKinematics();
184 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
185 Int_t AliHMPIDParam::StackCount(Int_t pid,Int_t evt)
187 // Counts total number of particles of given sort (including secondary) for a given event
188 AliRunLoader *pAL=AliRunLoader::Open();
190 if(pAL->LoadHeader()) return 0;
191 if(pAL->LoadKinematics()) return 0;
192 AliStack *pStack=pAL->Stack();
195 for(Int_t i=0;i<pStack->GetNtrack();i++) if(pStack->Particle(i)->GetPdgCode()==pid) iCnt++;
197 pAL->UnloadHeader(); pAL->UnloadKinematics();
200 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
201 Double_t AliHMPIDParam::Sigma2(Double_t trkTheta,Double_t trkPhi,Double_t ckovTh, Double_t ckovPh)
203 // Analithical calculation of total error (as a sum of localization, geometrical and chromatic errors) on Cerenkov angle for a given Cerenkov photon
204 // created by a given MIP. Fromulae according to CERN-EP-2000-058
205 // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
206 // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
208 // Returns: absolute error on Cerenkov angle, [radians]
210 TVector3 v(-999,-999,-999);
211 Double_t trkBeta = 1./(TMath::Cos(ckovTh)*GetRefIdx());
213 if(trkBeta > 1) trkBeta = 1; //protection against bad measured thetaCer
214 if(trkBeta < 0) trkBeta = 0.0001; //
216 v.SetX(SigLoc (trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
217 v.SetY(SigGeom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
218 v.SetZ(SigCrom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
222 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
223 Double_t AliHMPIDParam::SigLoc(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
225 // Analitical calculation of localization error (due to finite segmentation of PC) on Cerenkov angle for a given Cerenkov photon
226 // created by a given MIP. Fromulae according to CERN-EP-2000-058
227 // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
228 // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
230 // Returns: absolute error on Cerenkov angle, [radians]
232 Double_t phiDelta = phiC - trkPhi;
234 Double_t sint = TMath::Sin(trkTheta);
235 Double_t cost = TMath::Cos(trkTheta);
236 Double_t sinf = TMath::Sin(trkPhi);
237 Double_t cosf = TMath::Cos(trkPhi);
238 Double_t sinfd = TMath::Sin(phiDelta);
239 Double_t cosfd = TMath::Cos(phiDelta);
240 Double_t tantheta = TMath::Tan(thetaC);
242 Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
243 Double_t k = 1.-GetRefIdx()*GetRefIdx()+alpha*alpha/(betaM*betaM); // formula (after 8 in the text)
244 if (k<0) return 1e10;
245 Double_t mu =sint*sinf+tantheta*(cost*cosfd*sinf+sinfd*cosf); // formula (10)
246 Double_t e =sint*cosf+tantheta*(cost*cosfd*cosf-sinfd*sinf); // formula (9)
248 Double_t kk = betaM*TMath::Sqrt(k)/(GapThick()*alpha); // formula (6) and (7)
249 Double_t dtdxc = kk*(k*(cosfd*cosf-cost*sinfd*sinf)-(alpha*mu/(betaM*betaM))*sint*sinfd); // formula (6)
250 Double_t dtdyc = kk*(k*(cosfd*sinf+cost*sinfd*cosf)+(alpha* e/(betaM*betaM))*sint*sinfd); // formula (7) pag.4
252 Double_t errX = 0.2,errY=0.25; //end of page 7
253 return TMath::Sqrt(errX*errX*dtdxc*dtdxc + errY*errY*dtdyc*dtdyc);
255 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
256 Double_t AliHMPIDParam::SigCrom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
258 // Analitical calculation of chromatic error (due to lack of knowledge of Cerenkov photon energy) on Cerenkov angle for a given Cerenkov photon
259 // created by a given MIP. Fromulae according to CERN-EP-2000-058
260 // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
261 // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
263 // Returns: absolute error on Cerenkov angle, [radians]
265 Double_t phiDelta = phiC - trkPhi;
267 Double_t sint = TMath::Sin(trkTheta);
268 Double_t cost = TMath::Cos(trkTheta);
269 Double_t cosfd = TMath::Cos(phiDelta);
270 Double_t tantheta = TMath::Tan(thetaC);
272 Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
273 Double_t dtdn = cost*GetRefIdx()*betaM*betaM/(alpha*tantheta); // formula (12)
275 // Double_t f = 0.00928*(7.75-5.635)/TMath::Sqrt(12.);
276 Double_t f = 0.0172*(7.75-5.635)/TMath::Sqrt(24.);
280 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
281 Double_t AliHMPIDParam::SigGeom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
283 // Analitical calculation of geometric error (due to lack of knowledge of creation point in radiator) on Cerenkov angle for a given Cerenkov photon
284 // created by a given MIP. Formulae according to CERN-EP-2000-058
285 // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
286 // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
288 // Returns: absolute error on Cerenkov angle, [radians]
290 Double_t phiDelta = phiC - trkPhi;
292 Double_t sint = TMath::Sin(trkTheta);
293 Double_t cost = TMath::Cos(trkTheta);
294 Double_t sinf = TMath::Sin(trkPhi);
295 Double_t cosfd = TMath::Cos(phiDelta);
296 Double_t costheta = TMath::Cos(thetaC);
297 Double_t tantheta = TMath::Tan(thetaC);
299 Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
301 Double_t k = 1.-GetRefIdx()*GetRefIdx()+alpha*alpha/(betaM*betaM); // formula (after 8 in the text)
302 if (k<0) return 1e10;
304 Double_t eTr = 0.5*RadThick()*betaM*TMath::Sqrt(k)/(GapThick()*alpha); // formula (14)
305 Double_t lambda = 1.-sint*sint*sinf*sinf; // formula (15)
307 Double_t c1 = 1./(1.+ eTr*k/(alpha*alpha*costheta*costheta)); // formula (13.a)
308 Double_t c2 = betaM*TMath::Power(k,1.5)*tantheta*lambda/(GapThick()*alpha*alpha); // formula (13.b)
309 Double_t c3 = (1.+eTr*k*betaM*betaM)/((1+eTr)*alpha*alpha); // formula (13.c)
310 Double_t c4 = TMath::Sqrt(k)*tantheta*(1-lambda)/(GapThick()*betaM); // formula (13.d)
311 Double_t dtdT = c1 * (c2+c3*c4);
312 Double_t trErr = RadThick()/(TMath::Sqrt(12.)*cost);
316 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++