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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.), | |
37 | fPitch(0.) | |
7e4a628d | 38 | { |
39 | // Default constructor | |
40 | ||
41 | } | |
42 | ||
43 | //__________________________________________________________________________ | |
44 | void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
45 | { | |
46 | // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") | |
47 | // in the X direction, perpendicular to the wires, | |
48 | // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
49 | // in the same direction | |
50 | fSqrtKx3 = SqrtKx3; | |
51 | fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3); | |
52 | Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3)); | |
53 | fKx4 = cx1 / fKx2 / fSqrtKx3; | |
54 | } | |
55 | ||
56 | //__________________________________________________________________________ | |
57 | void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
58 | { | |
59 | // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") | |
60 | // in the Y direction, along the wires, | |
61 | // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
62 | // in the same direction | |
63 | fSqrtKy3 = SqrtKy3; | |
64 | fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3); | |
65 | Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3)); | |
66 | fKy4 = cy1 / fKy2 / fSqrtKy3; | |
67 | } | |
7e4a628d | 68 | |
471035eb | 69 | //_____________________________________________________________________________ |
70 | Float_t | |
71 | AliMUONMathieson::IntXY(Float_t xi1, Float_t yi1, Float_t xi2, Float_t yi2) const | |
72 | { | |
73 | AliDebug(1,Form("xi1=%e yi1=%e xi2=%e yi2=%e",xi1,yi1,xi2,yi2)); | |
74 | ||
75 | const Float_t kInversePitch = 1./fPitch; | |
76 | xi1 *= kInversePitch; | |
77 | xi2 *= kInversePitch; | |
78 | yi1 *= kInversePitch; | |
79 | yi2 *= kInversePitch; | |
80 | // | |
81 | // The Mathieson function | |
82 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
83 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
84 | ||
85 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
86 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
87 | ||
88 | ||
89 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
90 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
91 | } | |
92 | ||
a713db22 | 93 | // ------------------------------------------- |
94 | Float_t AliMUONMathieson::IntXY(Int_t idDE, AliMUONGeometrySegmentation* segmentation) | |
95 | { | |
96 | // Calculate charge on current pad according to Mathieson distribution | |
97 | // using Detection elt | |
a713db22 | 98 | // |
99 | // Integration limits defined by segmentation model | |
100 | // | |
101 | Float_t xi1, xi2, yi1, yi2; | |
102 | segmentation->IntegrationLimits(idDE, xi1,xi2,yi1,yi2); | |
471035eb | 103 | return IntXY(xi1,yi1,xi2,yi2); |
a713db22 | 104 | } |