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7e4a628d | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, 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 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
7e4a628d | 18 | #include "AliMUONMathieson.h" |
471035eb | 19 | |
20 | #include "AliLog.h" | |
a713db22 | 21 | #include "AliMUONGeometrySegmentation.h" |
7e4a628d | 22 | |
471035eb | 23 | #include <TClass.h> |
24 | #include <TMath.h> | |
25 | #include <TRandom.h> | |
7e4a628d | 26 | |
27 | ClassImp(AliMUONMathieson) | |
28 | ||
29 | //__________________________________________________________________________ | |
a713db22 | 30 | AliMUONMathieson::AliMUONMathieson() : |
31 | fSqrtKx3(0.), | |
32 | fKx2(0.), | |
33 | fKx4(0.), | |
34 | fSqrtKy3(0.), | |
35 | fKy2(0.), | |
36 | fKy4(0.), | |
8bd8c4ce | 37 | fPitch(0.), |
38 | fInversePitch(0.) | |
7e4a628d | 39 | { |
40 | // Default constructor | |
41 | ||
42 | } | |
43 | ||
44 | //__________________________________________________________________________ | |
45 | void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
46 | { | |
47 | // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") | |
48 | // in the X direction, perpendicular to the wires, | |
49 | // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
50 | // in the same direction | |
51 | fSqrtKx3 = SqrtKx3; | |
52 | fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3); | |
53 | Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3)); | |
54 | fKx4 = cx1 / fKx2 / fSqrtKx3; | |
55 | } | |
56 | ||
57 | //__________________________________________________________________________ | |
58 | void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
59 | { | |
60 | // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") | |
61 | // in the Y direction, along the wires, | |
62 | // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
63 | // in the same direction | |
64 | fSqrtKy3 = SqrtKy3; | |
65 | fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3); | |
66 | Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3)); | |
67 | fKy4 = cy1 / fKy2 / fSqrtKy3; | |
68 | } | |
7e4a628d | 69 | |
471035eb | 70 | //_____________________________________________________________________________ |
71 | Float_t | |
72 | AliMUONMathieson::IntXY(Float_t xi1, Float_t yi1, Float_t xi2, Float_t yi2) const | |
73 | { | |
8bd8c4ce | 74 | // |
75 | // Integrate the Mathieson over x and y | |
76 | // | |
77 | xi1 *= fInversePitch; | |
78 | xi2 *= fInversePitch; | |
79 | yi1 *= fInversePitch; | |
80 | yi2 *= fInversePitch; | |
471035eb | 81 | // |
82 | // The Mathieson function | |
83 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
84 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
85 | ||
86 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
87 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
88 | ||
89 | ||
90 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
91 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
92 | } | |
93 | ||
a713db22 | 94 | // ------------------------------------------- |
95 | Float_t AliMUONMathieson::IntXY(Int_t idDE, AliMUONGeometrySegmentation* segmentation) | |
96 | { | |
97 | // Calculate charge on current pad according to Mathieson distribution | |
98 | // using Detection elt | |
a713db22 | 99 | // |
100 | // Integration limits defined by segmentation model | |
101 | // | |
102 | Float_t xi1, xi2, yi1, yi2; | |
103 | segmentation->IntegrationLimits(idDE, xi1,xi2,yi1,yi2); | |
471035eb | 104 | return IntXY(xi1,yi1,xi2,yi2); |
a713db22 | 105 | } |
8bd8c4ce | 106 | |
107 | //______________________________________________________________________________ | |
108 | void | |
109 | AliMUONMathieson::SetPitch(Float_t p1) | |
110 | { | |
111 | // | |
112 | // Defines the pitch, and store its inverse, which is what is used in fact. | |
113 | // | |
114 | fPitch = p1; | |
115 | if ( fPitch ) | |
116 | { | |
117 | fInversePitch = 1/fPitch; | |
118 | } | |
119 | else | |
120 | { | |
121 | AliError(Form("Invalid pitch %e",p1)); | |
122 | fInversePitch = 0.0; | |
123 | } | |
124 | } | |
125 |