1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
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14 **************************************************************************/
18 //_________________________________________________________________________
19 // Main class for TRD1 geometry of Shish-Kebab case.
20 // Author: Aleksei Pavlinov(WSU).
22 // See web page with description of Shish-Kebab geometries:
23 // http://pdsfweb01.nersc.gov/~pavlinov/ALICE/SHISHKEBAB/RES/shishkebabALICE.html
24 //_________________________________________________________________________
26 #include "AliEMCALShishKebabTrd1Module.h"
28 #include "AliEMCALGeometry.h"
30 #include <Riostream.h>
33 ClassImp(AliEMCALShishKebabTrd1Module)
35 AliEMCALGeometry *AliEMCALShishKebabTrd1Module::fgGeometry=0;
36 Double_t AliEMCALShishKebabTrd1Module::fga=0.;
37 Double_t AliEMCALShishKebabTrd1Module::fga2=0.;
38 Double_t AliEMCALShishKebabTrd1Module::fgb=0.;
39 Double_t AliEMCALShishKebabTrd1Module::fgr=0.;
40 Double_t AliEMCALShishKebabTrd1Module::fgangle=0.; // around one degree
41 Double_t AliEMCALShishKebabTrd1Module::fgtanBetta=0; //
43 //_____________________________________________________________________________
44 AliEMCALShishKebabTrd1Module::AliEMCALShishKebabTrd1Module(Double_t theta, AliEMCALGeometry *g) : TNamed()
46 // theta in radians ; first object shold be with theta=pi/2.
49 fTheta = TMath::PiOver2();
54 } else Warning("AliEMCALShishKebabTrd1Module(theta)","You should call this constractor just once !!");
56 cout<< "AliEMCALShishKebabTrd1Module - first module: theta " << fTheta << " geometry " << g << endl;
59 //_____________________________________________________________________________
60 AliEMCALShishKebabTrd1Module::AliEMCALShishKebabTrd1Module(AliEMCALShishKebabTrd1Module &leftNeighbor) : TNamed()
62 // printf("** Left Neighbor : %s **\n", leftNeighbor.GetName());
63 TObject::SetUniqueID(leftNeighbor.GetUniqueID()+1);
64 fTheta = leftNeighbor.GetTheta() - fgangle;
65 Init(leftNeighbor.GetA(),leftNeighbor.GetB());
68 //________________________________________________________________
69 AliEMCALShishKebabTrd1Module::AliEMCALShishKebabTrd1Module(const AliEMCALShishKebabTrd1Module& mod) : TNamed(mod.GetName(),mod.GetTitle())
75 fThetaA = mod.fThetaA;
85 //________________________________________________________________
86 void AliEMCALShishKebabTrd1Module::Init(Double_t A, Double_t B)
88 // Define parameter module from parameters A,B from previos.
89 Double_t yl = (fgb/2)*TMath::Sin(fTheta) + (fga/2)*TMath::Cos(fTheta) + fgr, y = yl;
90 Double_t xl = (yl - B) / A; // y=A*x+B
92 // Double_t xp1 = (fga/2. + fgb/2.*fgtanBetta)/(TMath::Sin(fTheta) + fgtanBetta*TMath::Cos(fTheta));
93 // printf(" xp1 %9.3f \n ", xp1);
94 // xp1 == xp => both methods give the same results - 3-feb-05
95 Double_t alpha = TMath::Pi()/2. + fgangle/2;
96 Double_t xt = (fga+fga2)*TMath::Tan(fTheta)*TMath::Tan(alpha)/(4.*(1.-TMath::Tan(fTheta)*TMath::Tan(alpha)));
97 Double_t yt = xt / TMath::Tan(fTheta), xp = TMath::Sqrt(xt*xt + yt*yt);
100 // printf(" yl %9.3f | xl %9.3f | xp %9.3f \n", yl, xl, xp);
102 // have to define A and B;
103 Double_t yCprev = fgr + fga*TMath::Cos(fTheta);
104 Double_t xCprev = (yCprev - B) / A;
105 Double_t xA = xCprev + fga*TMath::Sin(fTheta), yA = fgr;
107 fThetaA = fTheta - fgangle/2.;
108 fA = TMath::Tan(fThetaA); // !!
113 Double_t kk1 = (fga+fga2)/(2.*4.); // kk1=kk2
115 Double_t xk1 = fOK.X() - kk1*TMath::Sin(fTheta);
116 Double_t yk1 = fOK.Y() + kk1*TMath::Cos(fTheta) - fgr;
119 Double_t xk2 = fOK.X() + kk1*TMath::Sin(fTheta);
120 Double_t yk2 = fOK.Y() - kk1*TMath::Cos(fTheta) - fgr;
123 // May 15, 2006; position of cell face of cells
124 fOB.Set(fOK.X()-fgb/2.*TMath::Cos(fTheta), fOK.Y()-fgb/2.*TMath::Sin(fTheta)-fgr);
125 fOB1.Set(fOB.X()-fga/4.*TMath::Sin(fTheta), fOB.Y()+fga/4.*TMath::Cos(fTheta));
126 fOB2.Set(fOB.X()+fga/4.*TMath::Sin(fTheta), fOB.Y()-fga/4.*TMath::Cos(fTheta));
129 //_____________________________________________________________________________
130 void AliEMCALShishKebabTrd1Module::DefineFirstModule()
132 // Define first module
133 fOK.Set(fga2/2., fgr + fgb/2.); // position the center of module vs o
135 // parameters of right line : y = A*z + B in system where zero point is IP.
136 fThetaA = fTheta - fgangle/2.;
137 fA = TMath::Tan(fThetaA);
138 Double_t xA = fga/2. + fga2/2., yA = fgr;
141 Double_t kk1 = (fga+fga2)/(2.*4.); // kk1=kk2
142 fOK1.Set(fOK.X() - kk1, fOK.Y()-fgr);
143 fOK2.Set(fOK.X() + kk1, fOK.Y()-fgr);
145 fOB.Set(fOK.X(),fOK.Y()-fgb/2.-fgr);
146 fOB1.Set(fOB.X()-fga/4., fOB.Y());
147 fOB2.Set(fOB.X()+fga/4., fOB.Y());
149 TObject::SetUniqueID(1); //
152 //_____________________________________________________________________________
153 void AliEMCALShishKebabTrd1Module::DefineName(Double_t theta)
155 // Define name of object
156 SetName(Form("%2i(%5.2f)", TObject::GetUniqueID(), theta*TMath::RadToDeg()));
159 //_____________________________________________________________________________
160 Bool_t AliEMCALShishKebabTrd1Module::GetParameters()
162 // Get needing module parameters from EMCAL geometry
163 if(!fgGeometry) fgGeometry = AliEMCALGeometry::GetInstance();
164 TString sn(fgGeometry->GetName()); // 2-Feb-05
167 Warning("GetParameters()"," No geometry ");
171 fga = (Double_t)fgGeometry->GetEtaModuleSize();
172 fgb = (Double_t)fgGeometry->GetLongModuleSize();
173 fgangle = Double_t(fgGeometry->GetTrd1Angle())*TMath::DegToRad();
174 fgtanBetta = TMath::Tan(fgangle/2.);
175 fgr = (Double_t)fgGeometry->GetIPDistance();
176 if(!sn.Contains("TRD2")) fgr += fgGeometry->GetSteelFrontThickness();
177 fga2 = Double_t(fgGeometry->Get2Trd1Dx2());
183 //_____________________________________________________________________________
184 void AliEMCALShishKebabTrd1Module::PrintShish(int pri) const
188 printf("PrintShish() \n a %7.3f:%7.3f | b %7.2f | r %7.2f \n TRD1 angle %7.6f(%5.2f) | tanBetta %7.6f",
189 fga, fga2, fgb, fgr, fgangle, fgangle*TMath::RadToDeg(), fgtanBetta);
190 printf(" fTheta %f : %5.2f : cos(theta) %f\n",
191 fTheta, GetThetaInDegree(),TMath::Cos(fTheta));
193 printf(" %i |%s| theta %f : fOK.Phi = %f(%5.2f)\n",
194 GetUniqueID(), GetName(), fTheta, fOK.Phi(),fOK.Phi()*TMath::RadToDeg());
195 printf(" A %f B %f | fThetaA %7.6f(%5.2f)\n", fA,fB, fThetaA,fThetaA*TMath::RadToDeg());
196 printf(" fOK : X %9.4f: Y %9.4f \n", fOK.X(), fOK.Y());
197 printf(" fOK1 : X %9.4f: Y %9.4f (local, ieta=2)\n", fOK1.X(), fOK1.Y());
198 printf(" fOK2 : X %9.4f: Y %9.4f (local, ieta=1)\n\n", fOK2.X(), fOK2.Y());
199 printf(" fOB : X %9.4f: Y %9.4f \n", fOB.X(), fOB.Y());
200 printf(" fOB1 : X %9.4f: Y %9.4f (local, ieta=2)\n", fOB1.X(), fOB1.Y());
201 printf(" fOB2 : X %9.4f: Y %9.4f (local, ieta=1)\n", fOB2.X(), fOB2.Y());
207 //_____________________________________________________________________________
208 Double_t AliEMCALShishKebabTrd1Module::GetThetaInDegree() const
210 return fTheta*TMath::RadToDeg();
213 //_____________________________________________________________________________
214 Double_t AliEMCALShishKebabTrd1Module::GetEtaOfCenterOfModule() const
216 return -TMath::Log(TMath::Tan(fOK.Phi()/2.));