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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 | ||
18 | #include <TMath.h> | |
19 | #include <TRandom.h> | |
20 | ||
21 | #include "AliMUONMathieson.h" | |
a713db22 | 22 | #include "AliMUONGeometrySegmentation.h" |
7e4a628d | 23 | |
24 | ||
25 | ClassImp(AliMUONMathieson) | |
26 | ||
27 | //__________________________________________________________________________ | |
a713db22 | 28 | AliMUONMathieson::AliMUONMathieson() : |
29 | fSqrtKx3(0.), | |
30 | fKx2(0.), | |
31 | fKx4(0.), | |
32 | fSqrtKy3(0.), | |
33 | fKy2(0.), | |
34 | fKy4(0.), | |
35 | fPitch(0.) | |
7e4a628d | 36 | { |
37 | // Default constructor | |
38 | ||
39 | } | |
40 | ||
41 | //__________________________________________________________________________ | |
42 | void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
43 | { | |
44 | // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") | |
45 | // in the X direction, perpendicular to the wires, | |
46 | // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
47 | // in the same direction | |
48 | fSqrtKx3 = SqrtKx3; | |
49 | fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3); | |
50 | Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3)); | |
51 | fKx4 = cx1 / fKx2 / fSqrtKx3; | |
52 | } | |
53 | ||
54 | //__________________________________________________________________________ | |
55 | void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
56 | { | |
57 | // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") | |
58 | // in the Y direction, along the wires, | |
59 | // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
60 | // in the same direction | |
61 | fSqrtKy3 = SqrtKy3; | |
62 | fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3); | |
63 | Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3)); | |
64 | fKy4 = cy1 / fKy2 / fSqrtKy3; | |
65 | } | |
7e4a628d | 66 | |
a713db22 | 67 | // ------------------------------------------- |
68 | Float_t AliMUONMathieson::IntXY(Int_t idDE, AliMUONGeometrySegmentation* segmentation) | |
69 | { | |
70 | // Calculate charge on current pad according to Mathieson distribution | |
71 | // using Detection elt | |
72 | ||
73 | const Float_t kInversePitch = 1./fPitch; | |
74 | // | |
75 | // Integration limits defined by segmentation model | |
76 | // | |
77 | Float_t xi1, xi2, yi1, yi2; | |
78 | segmentation->IntegrationLimits(idDE, xi1,xi2,yi1,yi2); | |
79 | xi1=xi1*kInversePitch; | |
80 | xi2=xi2*kInversePitch; | |
81 | yi1=yi1*kInversePitch; | |
82 | yi2=yi2*kInversePitch; | |
83 | // | |
84 | // The Mathieson function | |
85 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
86 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
7e4a628d | 87 | |
a713db22 | 88 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); |
89 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
7e4a628d | 90 | |
a713db22 | 91 | |
92 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
93 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
94 | } |