Logging of Debug, Info and Error Messages follwing AliRoot Standard http://aliweb...
[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
88cb7938 16/* $Id$ */
a9e2aefa 17
a9e2aefa 18#include <TMath.h>
19#include <TRandom.h>
20
30178c30 21#include "AliMUONResponseV0.h"
22#include "AliSegmentation.h"
a9e2aefa 23
8c343c7c 24
d5bfadcc 25ClassImp(AliMUONResponseV0)
26
30178c30 27//__________________________________________________________________________
28AliMUONResponseV0::AliMUONResponseV0()
29 : AliMUONResponse()
30{
31// Default constructor
32
33 fChargeCorrel = 0;
34}
35
d5bfadcc 36 //__________________________________________________________________________
37void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
38{
39 // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
40 // in the X direction, perpendicular to the wires,
41 // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
42 // in the same direction
43 fSqrtKx3 = SqrtKx3;
44 fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
45 Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
46 fKx4 = cx1 / fKx2 / fSqrtKx3;
47}
48
49 //__________________________________________________________________________
50void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
51{
52 // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
53 // in the Y direction, along the wires,
54 // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
55 // in the same direction
56 fSqrtKy3 = SqrtKy3;
57 fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
58 Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
59 fKy4 = cy1 / fKy2 / fSqrtKy3;
60}
61
a9e2aefa 62Float_t AliMUONResponseV0::IntPH(Float_t eloss)
63{
64 // Calculate charge from given ionization energy loss
65 Int_t nel;
4ac9d21e 66 nel= Int_t(eloss*1.e9/27.4);
a9e2aefa 67 Float_t charge=0;
68 if (nel == 0) nel=1;
69 for (Int_t i=1;i<=nel;i++) {
01997fa2 70 Float_t arg=0.;
71 while(!arg) arg = gRandom->Rndm();
72 charge -= fChargeSlope*TMath::Log(arg);
a9e2aefa 73 }
74 return charge;
75}
76// -------------------------------------------
77
a30a000f 78Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation)
a9e2aefa 79{
80// Calculate charge on current pad according to Mathieson distribution
81//
82 const Float_t kInversePitch = 1/fPitch;
83//
84// Integration limits defined by segmentation model
85//
86 Float_t xi1, xi2, yi1, yi2;
87 segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
88 xi1=xi1*kInversePitch;
89 xi2=xi2*kInversePitch;
90 yi1=yi1*kInversePitch;
91 yi2=yi2*kInversePitch;
92//
93// The Mathieson function
94 Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
95 Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
96
97 Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
98 Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
99
100
101 return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
102 fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
103}
104
f7b62f08 105Int_t AliMUONResponseV0::DigitResponse(Int_t digit, AliMUONTransientDigit* /*where*/)
a9e2aefa 106{
107 // add white noise and do zero-suppression and signal truncation
b64652f5 108// Float_t meanNoise = gRandom->Gaus(1, 0.2);
109 // correct noise for slat chambers;
110 // one more field to add to AliMUONResponseV0 to allow different noises ????
4ac9d21e 111 Float_t meanNoise = gRandom->Gaus(1., 0.2);
112 Float_t noise = gRandom->Gaus(0., meanNoise);
104b5ac2 113 digit += TMath::Nint(noise);
ddc10e24 114 if ( digit <= ZeroSuppression()) digit = 0;
4ac9d21e 115 // if ( digit > MaxAdc()) digit=MaxAdc();
116 if ( digit > Saturation()) digit=Saturation();
117
a9e2aefa 118 return digit;
119}
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