Commit of new FMD3 geometry and other geometry related issues.
[u/mrichter/AliRoot.git] / FMD / AliFMD3.cxx
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4347b38f 1/**************************************************************************
2 * Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
4347b38f 15/* $Id$ */
c2fc1258 16/** @file AliFMD3.cxx
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
20*/
ba224443 21//____________________________________________________________________
4347b38f 22//
1a1fdef7 23// Concrete implementation of AliFMDDetector
4347b38f 24//
088f8e79 25// This implements the geometry for FMD3.
26// This has 2 rings.
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.
6169f936 29// The support is a special cone of carbon-fibre made by a Danish
30// Yacht company.
4347b38f 31//
090026bf 32
33#include <TMath.h> // ROOT_TMath
34
e802be3e 35#include "AliFMD3.h" // ALIFMD3_H
f95a63c4 36#include "AliFMDDebug.h" // ALIFMDDEBUG_H ALILOG_H
e802be3e 37#include "AliFMDRing.h" // ALIFMDRING_H
ed82d35e 38#include <TVector3.h>
4347b38f 39
1a1fdef7 40//====================================================================
925e6570 41ClassImp(AliFMD3)
1a1fdef7 42#if 0
43 ; // This is here to keep Emacs for indenting the next line
44#endif
4347b38f 45
46//____________________________________________________________________
1a1fdef7 47AliFMD3::AliFMD3(AliFMDRing* inner, AliFMDRing* outer)
b5ee4425 48 : AliFMDDetector(3, inner, outer),
ed82d35e 49 fNoseZ(16.54667), // From drawing
50 fFlangeDepth(0),
51 fFlangeHighR(49.25), // From drawing
52 fFlangeLength(0),
53 fFlangeWidth(6), // From drawing
54 fFiducialRadius(.25),
55 fConeInnerAngle(0),
56 fConeOuterAngle(0),
57 fHoleOffset(7), // From drawing
58 fHoleDepth(2), // What's needed
59 fHoleLength(0),
60 fHoleLowWidth(4), // What's needed
61 fHoleHighWidth(18), // What's needed
62 fBoltLength(1), // Guessed
63 fBoltRadius(0.15), // Estimate
64 fConeRadii(6),
65 fFiducialHoles(4)
4347b38f 66{
088f8e79 67 // Constructor.
ed82d35e 68 // SetInnerZ(-62.8); // By design
69 // SetOuterZ(-75.2); // By design
70 AliWarning("Z position of FMD3 rings may be off by 0.25cm!");
71 SetInnerZ(-63.05); // Slightly off (2.5mm) from design
72 SetOuterZ(-75.45); // Slightly off (2.5mm) from design
73
74 SetInnerHoneyLowR(4.18207); // From drawing
75 SetInnerHoneyHighR(19.74922); // From drawing
76 SetOuterHoneyLowR(13.4776); // From drawing
77 SetOuterHoneyHighR(31.01964); // From drawing
78
79 // These are from the drawings
80 fConeRadii.Add(new TVector3( 0, 5.55, 6.25));
81 fConeRadii.Add(new TVector3( 2.35, 5.55, 6.25));
82 fConeRadii.Add(new TVector3( 2.9935, 5.55, 6.88479));
83 fConeRadii.Add(new TVector3(28.9435, 31.50, 32.75850));
84 fConeRadii.Add(new TVector3(29.5, 31.50, 33.4));
85 fConeRadii.Add(new TVector3(30.9, 31.50, 33.4));
86
87 // These are from the drawings
88 fFiducialHoles.Add(new TVector2(29.666, 32.495));
89 fFiducialHoles.Add(new TVector2(31.082, 33.910));
90 fFiducialHoles.Add(new TVector2(32.674, 35.503));
91 fFiducialHoles.Add(new TVector2(33.403, 34.818));
4347b38f 92}
93
94//____________________________________________________________________
1a1fdef7 95void
96AliFMD3::Init()
4347b38f 97{
088f8e79 98 // Initialize
1a1fdef7 99 AliFMDDetector::Init();
ed82d35e 100 // TVector3& v0 = *(static_cast<TVector3*>(fConeRadii.At(0)));
101 TVector3& v1 = *(static_cast<TVector3*>(fConeRadii.At(1)));
102 TVector3& v2 = *(static_cast<TVector3*>(fConeRadii.At(2)));
103 TVector3& v3 = *(static_cast<TVector3*>(fConeRadii.At(3)));
104 TVector3& v4 = *(static_cast<TVector3*>(fConeRadii.At(4)));
105 TVector3& v5 = *(static_cast<TVector3*>(fConeRadii.At(5)));
106
107 fFlangeDepth = v5.X() - v4.X();
108 fFlangeLength = fFlangeHighR - v5.Y();
109
110 fConeInnerAngle = TMath::ATan2(v4.Z()-v1.Z(), v4.X()-v1.X());
111 fConeOuterAngle = TMath::ATan2(v3.Y()-v2.Y(), v3.X()-v2.X());
112
113 Double_t hz1 = -fHoleOffset+fInnerZ+fNoseZ;
114 fHoleLength = TMath::Sqrt(TMath::Power(v4.Z()-ConeR(hz1),2) +
115 TMath::Power(v4.X()-fHoleOffset,2));
4347b38f 116}
117
ba224443 118//____________________________________________________________________
1a1fdef7 119Double_t
120AliFMD3::ConeR(Double_t z, Option_t* opt) const
ba224443 121{
1a1fdef7 122 // Calculate the cone radius at Z
ed82d35e 123 // TVector3& v0 = *(static_cast<TVector3*>(fConeRadii.At(0)));
124 TVector3& v1 = *(static_cast<TVector3*>(fConeRadii.At(1)));
125 TVector3& v2 = *(static_cast<TVector3*>(fConeRadii.At(2)));
126 TVector3& v3 = *(static_cast<TVector3*>(fConeRadii.At(3)));
127 TVector3& v4 = *(static_cast<TVector3*>(fConeRadii.At(4)));
128 TVector3& v5 = *(static_cast<TVector3*>(fConeRadii.At(5)));
129
130 if (z > fInnerZ + fNoseZ) {
131 AliWarning(Form("z=%lf is before start of cone %lf", z, fInnerZ + fNoseZ));
1a1fdef7 132 return -1;
ba224443 133 }
ed82d35e 134 if (z < fInnerZ + fNoseZ - v5.Z()) {
088f8e79 135 AliWarning(Form("z=%lf is after end of cone %lf", z,
ed82d35e 136 fInnerZ + fNoseZ - v5.Z()));
1a1fdef7 137 return -1;
138 }
ed82d35e 139 Double_t rz = -(z-fInnerZ-fNoseZ);
d98fbfa5 140 Bool_t inner = opt[0] == 'I' || opt[1] == 'i';
ed82d35e 141 if (inner && rz <= v2.X()) return v2.Y();
142 if (!inner && rz <= v1.X()) return v1.Z();
143 if (inner && rz > v3.X()) return v3.Y();
144 if (!inner && rz > v4.X()) return v4.Z();
145
146 rz -= (inner ? v2.X() : v1.X());
147 Double_t sr = (inner ? v2.Y() : v1.Z());
148 Double_t ang = (inner ? fConeInnerAngle : fConeOuterAngle);
149 return sr + rz * TMath::Tan(ang);
ba224443 150}
151
4347b38f 152
153//____________________________________________________________________
154//
155// EOF
156//