CPV images
[u/mrichter/AliRoot.git] / MUON / AliMUONResponseV0.cxx
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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 18Revision 1.2 2000/06/15 07:58:48 morsch
19Code from MUON-dev joined
20
a9e2aefa 21Revision 1.1.2.1 2000/06/09 21:33:35 morsch
22AliMUONResponse 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
32ClassImp(AliMUONResponseV0)
33Float_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 47Float_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
74Int_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}
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