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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 | ||
88cb7938 | 16 | /* $Id$ */ |
a9e2aefa | 17 | |
18 | #include "AliMUONResponseV0.h" | |
a30a000f | 19 | #include "AliSegmentation.h" |
a9e2aefa | 20 | #include <TMath.h> |
21 | #include <TRandom.h> | |
22 | ||
23 | ||
d5bfadcc | 24 | ClassImp(AliMUONResponseV0) |
25 | ||
26 | //__________________________________________________________________________ | |
27 | void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
28 | { | |
29 | // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") | |
30 | // in the X direction, perpendicular to the wires, | |
31 | // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
32 | // in the same direction | |
33 | fSqrtKx3 = SqrtKx3; | |
34 | fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3); | |
35 | Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3)); | |
36 | fKx4 = cx1 / fKx2 / fSqrtKx3; | |
37 | } | |
38 | ||
39 | //__________________________________________________________________________ | |
40 | void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
41 | { | |
42 | // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") | |
43 | // in the Y direction, along the wires, | |
44 | // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
45 | // in the same direction | |
46 | fSqrtKy3 = SqrtKy3; | |
47 | fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3); | |
48 | Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3)); | |
49 | fKy4 = cy1 / fKy2 / fSqrtKy3; | |
50 | } | |
51 | ||
a9e2aefa | 52 | Float_t AliMUONResponseV0::IntPH(Float_t eloss) |
53 | { | |
54 | // Calculate charge from given ionization energy loss | |
55 | Int_t nel; | |
4ac9d21e | 56 | nel= Int_t(eloss*1.e9/27.4); |
a9e2aefa | 57 | Float_t charge=0; |
58 | if (nel == 0) nel=1; | |
59 | for (Int_t i=1;i<=nel;i++) { | |
01997fa2 | 60 | Float_t arg=0.; |
61 | while(!arg) arg = gRandom->Rndm(); | |
62 | charge -= fChargeSlope*TMath::Log(arg); | |
a9e2aefa | 63 | } |
64 | return charge; | |
65 | } | |
66 | // ------------------------------------------- | |
67 | ||
a30a000f | 68 | Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation) |
a9e2aefa | 69 | { |
70 | // Calculate charge on current pad according to Mathieson distribution | |
71 | // | |
72 | const Float_t kInversePitch = 1/fPitch; | |
73 | // | |
74 | // Integration limits defined by segmentation model | |
75 | // | |
76 | Float_t xi1, xi2, yi1, yi2; | |
77 | segmentation->IntegrationLimits(xi1,xi2,yi1,yi2); | |
78 | xi1=xi1*kInversePitch; | |
79 | xi2=xi2*kInversePitch; | |
80 | yi1=yi1*kInversePitch; | |
81 | yi2=yi2*kInversePitch; | |
82 | // | |
83 | // The Mathieson function | |
84 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
85 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
86 | ||
87 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
88 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
89 | ||
90 | ||
91 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
92 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
93 | } | |
94 | ||
f7b62f08 | 95 | Int_t AliMUONResponseV0::DigitResponse(Int_t digit, AliMUONTransientDigit* /*where*/) |
a9e2aefa | 96 | { |
97 | // add white noise and do zero-suppression and signal truncation | |
b64652f5 | 98 | // Float_t meanNoise = gRandom->Gaus(1, 0.2); |
99 | // correct noise for slat chambers; | |
100 | // one more field to add to AliMUONResponseV0 to allow different noises ???? | |
4ac9d21e | 101 | Float_t meanNoise = gRandom->Gaus(1., 0.2); |
102 | Float_t noise = gRandom->Gaus(0., meanNoise); | |
a9e2aefa | 103 | digit+=(Int_t)noise; |
ddc10e24 | 104 | if ( digit <= ZeroSuppression()) digit = 0; |
4ac9d21e | 105 | // if ( digit > MaxAdc()) digit=MaxAdc(); |
106 | if ( digit > Saturation()) digit=Saturation(); | |
107 | ||
a9e2aefa | 108 | return digit; |
109 | } | |
110 | ||
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