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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 | $Log$ | |
a30a000f | 18 | Revision 1.2 2000/06/15 07:58:48 morsch |
19 | Code from MUON-dev joined | |
20 | ||
a9e2aefa | 21 | Revision 1.1.2.1 2000/06/09 21:33:35 morsch |
22 | AliMUONResponse code from AliMUONSegResV0.cxx | |
23 | ||
24 | */ | |
25 | ||
26 | #include "AliMUONResponseV0.h" | |
a30a000f | 27 | #include "AliSegmentation.h" |
a9e2aefa | 28 | #include <TMath.h> |
29 | #include <TRandom.h> | |
30 | ||
31 | ||
32 | ClassImp(AliMUONResponseV0) | |
33 | Float_t AliMUONResponseV0::IntPH(Float_t eloss) | |
34 | { | |
35 | // Calculate charge from given ionization energy loss | |
36 | Int_t nel; | |
37 | nel= Int_t(eloss*1.e9/32.); | |
38 | Float_t charge=0; | |
39 | if (nel == 0) nel=1; | |
40 | for (Int_t i=1;i<=nel;i++) { | |
41 | charge -= fChargeSlope*TMath::Log(gRandom->Rndm()); | |
42 | } | |
43 | return charge; | |
44 | } | |
45 | // ------------------------------------------- | |
46 | ||
a30a000f | 47 | Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation) |
a9e2aefa | 48 | { |
49 | // Calculate charge on current pad according to Mathieson distribution | |
50 | // | |
51 | const Float_t kInversePitch = 1/fPitch; | |
52 | // | |
53 | // Integration limits defined by segmentation model | |
54 | // | |
55 | Float_t xi1, xi2, yi1, yi2; | |
56 | segmentation->IntegrationLimits(xi1,xi2,yi1,yi2); | |
57 | xi1=xi1*kInversePitch; | |
58 | xi2=xi2*kInversePitch; | |
59 | yi1=yi1*kInversePitch; | |
60 | yi2=yi2*kInversePitch; | |
61 | // | |
62 | // The Mathieson function | |
63 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
64 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
65 | ||
66 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
67 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
68 | ||
69 | ||
70 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
71 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
72 | } | |
73 | ||
74 | Int_t AliMUONResponseV0::DigitResponse(Int_t digit) | |
75 | { | |
76 | // add white noise and do zero-suppression and signal truncation | |
77 | Float_t meanNoise = gRandom->Gaus(1, 0.2); | |
78 | Float_t noise = gRandom->Gaus(0, meanNoise); | |
79 | digit+=(Int_t)noise; | |
80 | if ( digit <= ZeroSuppression()) digit = 0; | |
81 | if ( digit > MaxAdc()) digit=MaxAdc(); | |
82 | return digit; | |
83 | } | |
84 | ||
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