1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
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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 **************************************************************************/
18 // -----------------------
19 // Class AliMUONMathieson
20 // -----------------------
21 // Implementation of Mathieson response
22 // Separated from other classes by CH. Finck with removing circular
25 #include "AliMUONMathieson.h"
28 #include "AliMUONGeometrySegmentation.h"
35 ClassImp(AliMUONMathieson)
38 //__________________________________________________________________________
39 AliMUONMathieson::AliMUONMathieson() :
49 /// Default constructor
53 //__________________________________________________________________________
54 AliMUONMathieson::~AliMUONMathieson()
59 //__________________________________________________________________________
60 void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
62 /// Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
63 /// in the X direction, perpendicular to the wires,
64 /// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
65 /// in the same direction
67 fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
68 Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
69 fKx4 = cx1 / fKx2 / fSqrtKx3;
72 //__________________________________________________________________________
73 void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
75 /// Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
76 /// in the Y direction, along the wires,
77 /// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
78 /// in the same direction
80 fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
81 Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
82 fKy4 = cy1 / fKy2 / fSqrtKy3;
85 //_____________________________________________________________________________
87 AliMUONMathieson::IntXY(Float_t xi1, Float_t yi1, Float_t xi2, Float_t yi2) const
89 /// Integrate the Mathieson over x and y
96 // The Mathieson function
97 Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
98 Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
100 Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
101 Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
104 return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
105 fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
108 // -------------------------------------------
109 Float_t AliMUONMathieson::IntXY(Int_t idDE, AliMUONGeometrySegmentation* segmentation) const
111 /// Calculate charge on current pad according to Mathieson distribution
112 /// using Detection elt
114 // Integration limits defined by segmentation model
116 Float_t xi1, xi2, yi1, yi2;
117 segmentation->IntegrationLimits(idDE, xi1,xi2,yi1,yi2);
118 return IntXY(xi1,yi1,xi2,yi2);
121 //______________________________________________________________________________
123 AliMUONMathieson::SetPitch(Float_t p1)
125 /// Defines the pitch, and store its inverse, which is what is used in fact.
130 fInversePitch = 1/fPitch;
134 AliError(Form("Invalid pitch %e",p1));