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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 | $Log$ | |
18 | Revision 1.3 2000/07/03 11:54:57 morsch | |
19 | AliMUONSegmentation and AliMUONHitMap have been replaced by AliSegmentation and AliHitMap in STEER | |
20 | The methods GetPadIxy and GetPadXxy of AliMUONSegmentation have changed name to GetPadI and GetPadC. | |
21 | ||
22 | Revision 1.2 2000/06/15 07:58:48 morsch | |
23 | Code from MUON-dev joined | |
24 | ||
25 | Revision 1.1.2.1 2000/06/09 21:33:35 morsch | |
26 | AliMUONResponse code from AliMUONSegResV0.cxx | |
27 | ||
28 | */ | |
29 | ||
30 | #include "AliMUONResponseV0.h" | |
31 | #include "AliSegmentation.h" | |
32 | #include <TMath.h> | |
33 | #include <TRandom.h> | |
34 | ||
35 | ||
36 | ClassImp(AliMUONResponseV0) | |
37 | Float_t AliMUONResponseV0::IntPH(Float_t eloss) | |
38 | { | |
39 | // Calculate charge from given ionization energy loss | |
40 | Int_t nel; | |
41 | nel= Int_t(eloss*1.e9/32.); | |
42 | Float_t charge=0; | |
43 | if (nel == 0) nel=1; | |
44 | for (Int_t i=1;i<=nel;i++) { | |
45 | Float_t arg=0.; | |
46 | while(!arg) arg = gRandom->Rndm(); | |
47 | charge -= fChargeSlope*TMath::Log(arg); | |
48 | } | |
49 | return charge; | |
50 | } | |
51 | // ------------------------------------------- | |
52 | ||
53 | Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation) | |
54 | { | |
55 | // Calculate charge on current pad according to Mathieson distribution | |
56 | // | |
57 | const Float_t kInversePitch = 1/fPitch; | |
58 | // | |
59 | // Integration limits defined by segmentation model | |
60 | // | |
61 | Float_t xi1, xi2, yi1, yi2; | |
62 | segmentation->IntegrationLimits(xi1,xi2,yi1,yi2); | |
63 | xi1=xi1*kInversePitch; | |
64 | xi2=xi2*kInversePitch; | |
65 | yi1=yi1*kInversePitch; | |
66 | yi2=yi2*kInversePitch; | |
67 | // | |
68 | // The Mathieson function | |
69 | Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1); | |
70 | Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2); | |
71 | ||
72 | Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1); | |
73 | Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2); | |
74 | ||
75 | ||
76 | return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))* | |
77 | fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1))); | |
78 | } | |
79 | ||
80 | Int_t AliMUONResponseV0::DigitResponse(Int_t digit) | |
81 | { | |
82 | // add white noise and do zero-suppression and signal truncation | |
83 | Float_t meanNoise = gRandom->Gaus(1, 0.2); | |
84 | Float_t noise = gRandom->Gaus(0, meanNoise); | |
85 | digit+=(Int_t)noise; | |
86 | if ( digit <= ZeroSuppression()) digit = 0; | |
87 | if ( digit > MaxAdc()) digit=MaxAdc(); | |
88 | return digit; | |
89 | } | |
90 | ||
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98 |