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4347b38f | 1 | /************************************************************************** |
c4bcfd14 | 2 | * Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. * |
4347b38f | 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 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
c4bcfd14 | 18 | //__________________________________________________________________ |
4347b38f | 19 | // |
20 | // Utility class to help implement collection of FMD modules into | |
1a1fdef7 | 21 | // rings. This is used by AliFMDDetector and AliFMDGeometry. |
4347b38f | 22 | // |
1a1fdef7 | 23 | // The AliFMDGeometry object owns the AliFMDRing objects, and the |
24 | // AliFMDDetector objects reference these. That is, the AliFMDRing | |
25 | // objects are share amoung the AliFMDDetector objects. | |
4347b38f | 26 | // |
27 | // Latest changes by Christian Holm Christensen | |
28 | // | |
5edc364e | 29 | |
56b1929b | 30 | #include <AliLog.h> // ALILOG_H |
e802be3e | 31 | #include "AliFMDRing.h" // ALIFMDRING_H |
56b1929b | 32 | #include <TMath.h> // ROOT_TMath |
56b1929b | 33 | #include <TVector2.h> // ROOT_TVector2 |
4347b38f | 34 | |
1a1fdef7 | 35 | //==================================================================== |
e6a0eb08 | 36 | ClassImp(AliFMDRing) |
1a1fdef7 | 37 | #if 0 |
38 | ; // This is here to keep Emacs for indenting the next line | |
39 | #endif | |
4347b38f | 40 | |
41 | //____________________________________________________________________ | |
1a1fdef7 | 42 | AliFMDRing::AliFMDRing(Char_t id) |
43 | : TNamed(Form("FMD%c", id), "Forward multiplicity ring"), | |
44 | fId(id), | |
45 | fVerticies(0) | |
4347b38f | 46 | { |
1a1fdef7 | 47 | SetBondingWidth(); |
48 | SetWaferRadius(); | |
49 | SetSiThickness(); | |
50 | SetLegRadius(); | |
51 | SetLegLength(); | |
52 | SetLegOffset(); | |
53 | SetModuleSpacing(); | |
54 | SetPrintboardThickness(); | |
4347b38f | 55 | |
1a1fdef7 | 56 | if (fId == 'I' || fId == 'i') { |
57 | SetLowR(4.3); | |
58 | SetHighR(17.2); | |
59 | SetTheta(36/2); | |
60 | SetNStrips(512); | |
61 | } | |
62 | else if (fId == 'O' || fId == 'o') { | |
63 | SetLowR(15.6); | |
64 | SetHighR(28.0); | |
65 | SetTheta(18/2); | |
66 | SetNStrips(256); | |
4347b38f | 67 | } |
4347b38f | 68 | } |
69 | ||
4347b38f | 70 | //____________________________________________________________________ |
71 | void | |
1a1fdef7 | 72 | AliFMDRing::Init() |
4347b38f | 73 | { |
1a1fdef7 | 74 | Double_t tanTheta = TMath::Tan(fTheta * TMath::Pi() / 180.); |
75 | Double_t tanTheta2 = TMath::Power(tanTheta,2); | |
76 | Double_t r2 = TMath::Power(fWaferRadius,2); | |
77 | Double_t yA = tanTheta * fLowR; | |
78 | Double_t lr2 = TMath::Power(fLowR, 2); | |
79 | Double_t hr2 = TMath::Power(fHighR,2); | |
80 | Double_t xD = fLowR + TMath::Sqrt(r2 - tanTheta2 * lr2); | |
81 | Double_t xD2 = TMath::Power(xD,2); | |
82 | Double_t yB = TMath::Sqrt(r2 - hr2 + 2 * fHighR * xD - xD2); | |
83 | Double_t xC = ((xD + TMath::Sqrt(-tanTheta2 * xD2 + r2 | |
84 | + r2 * tanTheta2)) | |
85 | / (1 + tanTheta2)); | |
86 | Double_t yC = tanTheta * xC; | |
4347b38f | 87 | |
1a1fdef7 | 88 | fVerticies.Expand(6); |
89 | fVerticies.AddAt(new TVector2(fLowR, -yA), 0); | |
90 | fVerticies.AddAt(new TVector2(xC, -yC), 1); | |
91 | fVerticies.AddAt(new TVector2(fHighR, -yB), 2); | |
92 | fVerticies.AddAt(new TVector2(fHighR, yB), 3); | |
93 | fVerticies.AddAt(new TVector2(xC, yC), 4); | |
94 | fVerticies.AddAt(new TVector2(fLowR, yA), 5); | |
95 | ||
96 | fRingDepth = (fSiThickness + fPrintboardThickness | |
97 | + fLegLength + fModuleSpacing); | |
4347b38f | 98 | } |
99 | ||
100 | //____________________________________________________________________ | |
1a1fdef7 | 101 | TVector2* |
102 | AliFMDRing::GetVertex(Int_t i) const | |
4347b38f | 103 | { |
1a1fdef7 | 104 | return static_cast<TVector2*>(fVerticies.At(i)); |
4347b38f | 105 | } |
106 | ||
107 | //____________________________________________________________________ | |
1a1fdef7 | 108 | void |
109 | AliFMDRing::Detector2XYZ(UShort_t sector, | |
110 | UShort_t strip, | |
111 | Double_t& x, | |
112 | Double_t& y, | |
113 | Double_t& z) const | |
4347b38f | 114 | { |
1a1fdef7 | 115 | if (sector >= GetNSectors()) { |
116 | Error("Detector2XYZ", "Invalid sector number %d (>=%d) in ring %c", | |
117 | sector, GetNSectors(), fId); | |
118 | return; | |
4347b38f | 119 | } |
1a1fdef7 | 120 | if (strip >= GetNStrips()) { |
121 | Error("Detector2XYZ", "Invalid strip number %d (>=%d)", | |
122 | strip, GetNStrips(), fId); | |
123 | return; | |
4347b38f | 124 | } |
1a1fdef7 | 125 | Double_t phi = Float_t(sector + .5) / GetNSectors() * 2 * TMath::Pi(); |
126 | Double_t r = Float_t(strip + .5) / GetNStrips() * (fHighR - fLowR) + fLowR; | |
127 | x = r * TMath::Cos(phi); | |
128 | y = r * TMath::Sin(phi); | |
129 | if (((sector / 2) % 2) == 1) | |
130 | z += TMath::Sign(fModuleSpacing, z); | |
4347b38f | 131 | } |
132 | ||
133 | // | |
134 | // EOF | |
135 | // |