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a9e2aefa | 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 | /* | |
17 | $Log$ | |
b64652f5 | 18 | Revision 1.5 2000/11/21 13:47:55 gosset |
19 | All Mathieson parameters (Sqrt(K3), K2 and K4) set in one function, | |
20 | SetSqrtKx3AndDeriveKx2Kx4 or SetSqrtKx3AndDeriveKx2Kx4, | |
21 | for each cathode plane | |
22 | ||
d5bfadcc | 23 | Revision 1.4 2000/10/25 10:41:52 morsch |
24 | IntPH(..): Protec Log against random numbers equal to 0. | |
25 | ||
01997fa2 | 26 | Revision 1.3 2000/07/03 11:54:57 morsch |
27 | AliMUONSegmentation and AliMUONHitMap have been replaced by AliSegmentation and AliHitMap in STEER | |
28 | The methods GetPadIxy and GetPadXxy of AliMUONSegmentation have changed name to GetPadI and GetPadC. | |
29 | ||
a30a000f | 30 | Revision 1.2 2000/06/15 07:58:48 morsch |
31 | Code from MUON-dev joined | |
32 | ||
a9e2aefa | 33 | Revision 1.1.2.1 2000/06/09 21:33:35 morsch |
34 | AliMUONResponse code from AliMUONSegResV0.cxx | |
35 | ||
36 | */ | |
37 | ||
38 | #include "AliMUONResponseV0.h" | |
a30a000f | 39 | #include "AliSegmentation.h" |
a9e2aefa | 40 | #include <TMath.h> |
41 | #include <TRandom.h> | |
42 | ||
43 | ||
d5bfadcc | 44 | ClassImp(AliMUONResponseV0) |
45 | ||
46 | //__________________________________________________________________________ | |
47 | void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
48 | { | |
49 | // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") | |
50 | // in the X direction, perpendicular to the wires, | |
51 | // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
52 | // in the same direction | |
53 | fSqrtKx3 = SqrtKx3; | |
54 | fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3); | |
55 | Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3)); | |
56 | fKx4 = cx1 / fKx2 / fSqrtKx3; | |
57 | } | |
58 | ||
59 | //__________________________________________________________________________ | |
60 | void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
61 | { | |
62 | // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") | |
63 | // in the Y direction, along the wires, | |
64 | // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
65 | // in the same direction | |
66 | fSqrtKy3 = SqrtKy3; | |
67 | fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3); | |
68 | Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3)); | |
69 | fKy4 = cy1 / fKy2 / fSqrtKy3; | |
70 | } | |
71 | ||
a9e2aefa | 72 | Float_t AliMUONResponseV0::IntPH(Float_t eloss) |
73 | { | |
74 | // Calculate charge from given ionization energy loss | |
75 | Int_t nel; | |
76 | nel= Int_t(eloss*1.e9/32.); | |
77 | Float_t charge=0; | |
78 | if (nel == 0) nel=1; | |
79 | for (Int_t i=1;i<=nel;i++) { | |
01997fa2 | 80 | Float_t arg=0.; |
81 | while(!arg) arg = gRandom->Rndm(); | |
82 | charge -= fChargeSlope*TMath::Log(arg); | |
a9e2aefa | 83 | } |
84 | return charge; | |
85 | } | |
86 | // ------------------------------------------- | |
87 | ||
a30a000f | 88 | Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation) |
a9e2aefa | 89 | { |
90 | // Calculate charge on current pad according to Mathieson distribution | |
91 | // | |
92 | const Float_t kInversePitch = 1/fPitch; | |
93 | // | |
94 | // Integration limits defined by segmentation model | |
95 | // | |
96 | Float_t xi1, xi2, yi1, yi2; | |
97 | segmentation->IntegrationLimits(xi1,xi2,yi1,yi2); | |
98 | xi1=xi1*kInversePitch; | |
99 | xi2=xi2*kInversePitch; | |
100 | yi1=yi1*kInversePitch; | |
101 | yi2=yi2*kInversePitch; | |
102 | // | |
103 | // The Mathieson function | |
104 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
105 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
106 | ||
107 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
108 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
109 | ||
110 | ||
111 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
112 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
113 | } | |
114 | ||
115 | Int_t AliMUONResponseV0::DigitResponse(Int_t digit) | |
116 | { | |
117 | // add white noise and do zero-suppression and signal truncation | |
b64652f5 | 118 | // Float_t meanNoise = gRandom->Gaus(1, 0.2); |
119 | // correct noise for slat chambers; | |
120 | // one more field to add to AliMUONResponseV0 to allow different noises ???? | |
121 | Float_t meanNoise = gRandom->Gaus(1.5, 0.2); | |
a9e2aefa | 122 | Float_t noise = gRandom->Gaus(0, meanNoise); |
123 | digit+=(Int_t)noise; | |
124 | if ( digit <= ZeroSuppression()) digit = 0; | |
125 | if ( digit > MaxAdc()) digit=MaxAdc(); | |
126 | return digit; | |
127 | } | |
128 | ||
129 | ||
130 | ||
131 | ||
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133 | ||
134 | ||
135 | ||
136 |