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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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14 **************************************************************************/
17 @author Christian Holm Christensen <cholm@nbi.dk>
18 @date Sun Mar 26 18:26:12 2006
19 @brief Concrete implementation of AliFMDDetector for FMD3
21 //____________________________________________________________________
23 // Concrete implementation of AliFMDDetector
25 // This implements the geometry for FMD3.
27 // The support of the FMD3 is a carbon-fibre cone, attached to the ITS
28 // support via flanges. The cone also supports the beam-pipe.
29 // The support is a special cone of carbon-fibre made by a Danish
33 #include <TMath.h> // ROOT_TMath
35 #include "AliFMD3.h" // ALIFMD3_H
36 #include "AliFMDDebug.h" // ALIFMDDEBUG_H ALILOG_H
37 #include "AliFMDRing.h" // ALIFMDRING_H
40 //====================================================================
43 ; // This is here to keep Emacs for indenting the next line
46 //____________________________________________________________________
47 AliFMD3::AliFMD3(AliFMDRing* inner, AliFMDRing* outer)
48 : AliFMDDetector(3, inner, outer),
50 fNoseZ(18.13 - inner->GetModuleDepth()-inner->GetModuleSpacing()/2), // From drawing
52 fFlangeHighR(49.25), // From drawing
54 fFlangeWidth(6), // From drawing
58 fHoleOffset(6.9), // From drawing
59 fHoleDepth(2), // What's needed
60 fHoleLength(31.2), // From drawing
61 fHoleLowWidth(3), // 4), // What's needed
62 fHoleHighWidth(18.5), // 17.5), // 18), // What's needed
63 fBoltLength(1), // Guessed
64 fBoltRadius(0.15), // Estimate
69 Double_t off = 0; // -0.39615-0.10185; // -0.25;
71 AliWarning(Form("Z position of FMD3 rings may be off by %fcm!", off));
73 SetInnerZ(-62.8+off); // By design
74 SetOuterZ(-75.2+off); // By design
76 SetInnerHoneyLowR(4.18207); // From drawing
77 SetInnerHoneyHighR(19.74922); // From drawing
78 SetOuterHoneyLowR(13.4776); // From drawing
79 SetOuterHoneyHighR(31.01964); // From drawing
81 // These are from the drawings
82 fConeRadii.Add(new TVector3( 0, 5.55, 6.25));
83 fConeRadii.Add(new TVector3( 2.35, 5.55, 6.25));
84 fConeRadii.Add(new TVector3( 2.9935, 5.55, 6.88479));
85 fConeRadii.Add(new TVector3(28.9435, 31.50, 32.75850));
86 fConeRadii.Add(new TVector3(29.5, 31.50, 33.4));
87 fConeRadii.Add(new TVector3(30.9, 31.50, 33.4));
89 // These are from the drawings
90 fFiducialHoles.Add(new TVector2(29.666, 32.495));
91 fFiducialHoles.Add(new TVector2(31.082, 33.910));
92 fFiducialHoles.Add(new TVector2(32.674, 35.503));
93 fFiducialHoles.Add(new TVector2(33.403, 34.818));
96 //____________________________________________________________________
101 AliFMDDetector::Init();
102 // TVector3& v0 = *(static_cast<TVector3*>(fConeRadii.At(0)));
103 TVector3& v1 = *(static_cast<TVector3*>(fConeRadii.At(1)));
104 TVector3& v2 = *(static_cast<TVector3*>(fConeRadii.At(2)));
105 TVector3& v3 = *(static_cast<TVector3*>(fConeRadii.At(3)));
106 TVector3& v4 = *(static_cast<TVector3*>(fConeRadii.At(4)));
107 TVector3& v5 = *(static_cast<TVector3*>(fConeRadii.At(5)));
109 fFlangeDepth = v5.X() - v4.X();
110 fFlangeLength = fFlangeHighR - v5.Y();
112 fConeInnerAngle = TMath::ATan2(v4.Z()-v1.Z(), v4.X()-v1.X());
113 fConeOuterAngle = TMath::ATan2(v3.Y()-v2.Y(), v3.X()-v2.X());
116 Double_t hz1 = -fHoleOffset+fInnerZ+fNoseZ;
117 fHoleLength = TMath::Sqrt(TMath::Power(v4.Z()-ConeR(hz1),2) +
118 TMath::Power(v4.X()-fHoleOffset,2));
122 //____________________________________________________________________
124 AliFMD3::ConeR(Double_t z, Option_t* opt) const
126 // Calculate the cone radius at Z
127 // TVector3& v0 = *(static_cast<TVector3*>(fConeRadii.At(0)));
128 TVector3& v1 = *(static_cast<TVector3*>(fConeRadii.At(1)));
129 TVector3& v2 = *(static_cast<TVector3*>(fConeRadii.At(2)));
130 TVector3& v3 = *(static_cast<TVector3*>(fConeRadii.At(3)));
131 TVector3& v4 = *(static_cast<TVector3*>(fConeRadii.At(4)));
132 TVector3& v5 = *(static_cast<TVector3*>(fConeRadii.At(5)));
134 if (z > fInnerZ + fNoseZ) {
135 AliWarning(Form("z=%lf is before start of cone %lf", z, fInnerZ + fNoseZ));
138 if (z < fInnerZ + fNoseZ - v5.Z()) {
139 AliWarning(Form("z=%lf is after end of cone %lf", z,
140 fInnerZ + fNoseZ - v5.Z()));
143 Double_t rz = -(z-fInnerZ-fNoseZ);
144 Bool_t inner = opt[0] == 'I' || opt[1] == 'i';
145 if (inner && rz <= v2.X()) return v2.Y();
146 if (!inner && rz <= v1.X()) return v1.Z();
147 if (inner && rz > v3.X()) return v3.Y();
148 if (!inner && rz > v4.X()) return v4.Z();
150 rz -= (inner ? v2.X() : v1.X());
151 Double_t sr = (inner ? v2.Y() : v1.Z());
152 Double_t ang = (inner ? fConeInnerAngle : fConeOuterAngle);
153 return sr + rz * TMath::Tan(ang);
157 //____________________________________________________________________