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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" | |
a713db22 | 28 | #include "AliMUONGeometrySegmentation.h" |
7e4a628d | 29 | |
471035eb | 30 | #include <TClass.h> |
31 | #include <TMath.h> | |
32 | #include <TRandom.h> | |
7e4a628d | 33 | |
34 | ClassImp(AliMUONMathieson) | |
35 | ||
36 | //__________________________________________________________________________ | |
a713db22 | 37 | AliMUONMathieson::AliMUONMathieson() : |
38 | fSqrtKx3(0.), | |
39 | fKx2(0.), | |
40 | fKx4(0.), | |
41 | fSqrtKy3(0.), | |
42 | fKy2(0.), | |
43 | fKy4(0.), | |
8bd8c4ce | 44 | fPitch(0.), |
45 | fInversePitch(0.) | |
7e4a628d | 46 | { |
d19b6003 | 47 | /// Default constructor |
7e4a628d | 48 | |
49 | } | |
50 | ||
51 | //__________________________________________________________________________ | |
52 | void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
53 | { | |
d19b6003 | 54 | /// Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") |
55 | /// in the X direction, perpendicular to the wires, | |
56 | /// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
57 | /// in the same direction | |
7e4a628d | 58 | fSqrtKx3 = SqrtKx3; |
59 | fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3); | |
60 | Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3)); | |
61 | fKx4 = cx1 / fKx2 / fSqrtKx3; | |
62 | } | |
63 | ||
64 | //__________________________________________________________________________ | |
65 | void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
66 | { | |
d19b6003 | 67 | /// Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") |
68 | /// in the Y direction, along the wires, | |
69 | /// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
70 | /// in the same direction | |
7e4a628d | 71 | fSqrtKy3 = SqrtKy3; |
72 | fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3); | |
73 | Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3)); | |
74 | fKy4 = cy1 / fKy2 / fSqrtKy3; | |
75 | } | |
7e4a628d | 76 | |
471035eb | 77 | //_____________________________________________________________________________ |
78 | Float_t | |
79 | AliMUONMathieson::IntXY(Float_t xi1, Float_t yi1, Float_t xi2, Float_t yi2) const | |
80 | { | |
d19b6003 | 81 | /// Integrate the Mathieson over x and y |
82 | ||
8bd8c4ce | 83 | xi1 *= fInversePitch; |
84 | xi2 *= fInversePitch; | |
85 | yi1 *= fInversePitch; | |
86 | yi2 *= fInversePitch; | |
471035eb | 87 | // |
88 | // The Mathieson function | |
89 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
90 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
91 | ||
92 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
93 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
94 | ||
95 | ||
96 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
97 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
98 | } | |
99 | ||
a713db22 | 100 | // ------------------------------------------- |
85fec35d | 101 | Float_t AliMUONMathieson::IntXY(Int_t idDE, AliMUONGeometrySegmentation* segmentation) const |
a713db22 | 102 | { |
d19b6003 | 103 | /// Calculate charge on current pad according to Mathieson distribution |
104 | /// using Detection elt | |
105 | ||
a713db22 | 106 | // Integration limits defined by segmentation model |
107 | // | |
108 | Float_t xi1, xi2, yi1, yi2; | |
109 | segmentation->IntegrationLimits(idDE, xi1,xi2,yi1,yi2); | |
471035eb | 110 | return IntXY(xi1,yi1,xi2,yi2); |
a713db22 | 111 | } |
8bd8c4ce | 112 | |
113 | //______________________________________________________________________________ | |
114 | void | |
115 | AliMUONMathieson::SetPitch(Float_t p1) | |
116 | { | |
d19b6003 | 117 | /// Defines the pitch, and store its inverse, which is what is used in fact. |
118 | ||
8bd8c4ce | 119 | fPitch = p1; |
120 | if ( fPitch ) | |
121 | { | |
122 | fInversePitch = 1/fPitch; | |
123 | } | |
124 | else | |
125 | { | |
126 | AliError(Form("Invalid pitch %e",p1)); | |
127 | fInversePitch = 0.0; | |
128 | } | |
129 | } | |
130 |