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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 | ||
d19b6003 | 18 | // ----------------------- |
19 | // Class AliMUONMathieson | |
20 | // ----------------------- | |
21 | // Implementation of Mathieson response | |
22 | // Separated from other classes by CH. Finck with removing circular | |
23 | // dependencies | |
24 | ||
7e4a628d | 25 | #include "AliMUONMathieson.h" |
471035eb | 26 | |
27 | #include "AliLog.h" | |
7e4a628d | 28 | |
471035eb | 29 | #include <TClass.h> |
30 | #include <TMath.h> | |
31 | #include <TRandom.h> | |
7e4a628d | 32 | |
5398f946 | 33 | /// \cond CLASSIMP |
7e4a628d | 34 | ClassImp(AliMUONMathieson) |
5398f946 | 35 | /// \endcond |
7e4a628d | 36 | |
37 | //__________________________________________________________________________ | |
5398f946 | 38 | AliMUONMathieson::AliMUONMathieson() : |
a713db22 | 39 | fSqrtKx3(0.), |
40 | fKx2(0.), | |
41 | fKx4(0.), | |
42 | fSqrtKy3(0.), | |
43 | fKy2(0.), | |
44 | fKy4(0.), | |
8bd8c4ce | 45 | fPitch(0.), |
46 | fInversePitch(0.) | |
7e4a628d | 47 | { |
d19b6003 | 48 | /// Default constructor |
7e4a628d | 49 | |
5398f946 | 50 | } |
51 | ||
52 | //__________________________________________________________________________ | |
53 | AliMUONMathieson::~AliMUONMathieson() | |
54 | { | |
55 | /// Destructor | |
7e4a628d | 56 | } |
57 | ||
58 | //__________________________________________________________________________ | |
59 | void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
60 | { | |
d19b6003 | 61 | /// Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") |
62 | /// in the X direction, perpendicular to the wires, | |
63 | /// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
64 | /// in the same direction | |
7e4a628d | 65 | fSqrtKx3 = SqrtKx3; |
66 | fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3); | |
67 | Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3)); | |
68 | fKx4 = cx1 / fKx2 / fSqrtKx3; | |
69 | } | |
70 | ||
71 | //__________________________________________________________________________ | |
72 | void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
73 | { | |
d19b6003 | 74 | /// Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") |
75 | /// in the Y direction, along the wires, | |
76 | /// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
77 | /// in the same direction | |
7e4a628d | 78 | fSqrtKy3 = SqrtKy3; |
79 | fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3); | |
80 | Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3)); | |
81 | fKy4 = cy1 / fKy2 / fSqrtKy3; | |
82 | } | |
7e4a628d | 83 | |
471035eb | 84 | //_____________________________________________________________________________ |
85 | Float_t | |
86 | AliMUONMathieson::IntXY(Float_t xi1, Float_t yi1, Float_t xi2, Float_t yi2) const | |
87 | { | |
d19b6003 | 88 | /// Integrate the Mathieson over x and y |
89 | ||
8bd8c4ce | 90 | xi1 *= fInversePitch; |
91 | xi2 *= fInversePitch; | |
92 | yi1 *= fInversePitch; | |
93 | yi2 *= fInversePitch; | |
471035eb | 94 | // |
95 | // The Mathieson function | |
96 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
97 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
98 | ||
99 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
100 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
101 | ||
102 | ||
103 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
104 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
105 | } | |
106 | ||
8bd8c4ce | 107 | //______________________________________________________________________________ |
108 | void | |
109 | AliMUONMathieson::SetPitch(Float_t p1) | |
110 | { | |
d19b6003 | 111 | /// Defines the pitch, and store its inverse, which is what is used in fact. |
112 | ||
8bd8c4ce | 113 | fPitch = p1; |
114 | if ( fPitch ) | |
115 | { | |
116 | fInversePitch = 1/fPitch; | |
117 | } | |
118 | else | |
119 | { | |
120 | AliError(Form("Invalid pitch %e",p1)); | |
121 | fInversePitch = 0.0; | |
122 | } | |
123 | } | |
124 |