1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.4 2000/10/25 10:41:52 morsch
19 IntPH(..): Protec Log against random numbers equal to 0.
21 Revision 1.3 2000/07/03 11:54:57 morsch
22 AliMUONSegmentation and AliMUONHitMap have been replaced by AliSegmentation and AliHitMap in STEER
23 The methods GetPadIxy and GetPadXxy of AliMUONSegmentation have changed name to GetPadI and GetPadC.
25 Revision 1.2 2000/06/15 07:58:48 morsch
26 Code from MUON-dev joined
28 Revision 1.1.2.1 2000/06/09 21:33:35 morsch
29 AliMUONResponse code from AliMUONSegResV0.cxx
33 #include "AliMUONResponseV0.h"
34 #include "AliSegmentation.h"
39 ClassImp(AliMUONResponseV0)
41 //__________________________________________________________________________
42 void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
44 // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
45 // in the X direction, perpendicular to the wires,
46 // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
47 // in the same direction
49 fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
50 Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
51 fKx4 = cx1 / fKx2 / fSqrtKx3;
54 //__________________________________________________________________________
55 void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
57 // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
58 // in the Y direction, along the wires,
59 // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
60 // in the same direction
62 fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
63 Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
64 fKy4 = cy1 / fKy2 / fSqrtKy3;
67 Float_t AliMUONResponseV0::IntPH(Float_t eloss)
69 // Calculate charge from given ionization energy loss
71 nel= Int_t(eloss*1.e9/32.);
74 for (Int_t i=1;i<=nel;i++) {
76 while(!arg) arg = gRandom->Rndm();
77 charge -= fChargeSlope*TMath::Log(arg);
81 // -------------------------------------------
83 Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation)
85 // Calculate charge on current pad according to Mathieson distribution
87 const Float_t kInversePitch = 1/fPitch;
89 // Integration limits defined by segmentation model
91 Float_t xi1, xi2, yi1, yi2;
92 segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
93 xi1=xi1*kInversePitch;
94 xi2=xi2*kInversePitch;
95 yi1=yi1*kInversePitch;
96 yi2=yi2*kInversePitch;
98 // The Mathieson function
99 Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
100 Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
102 Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
103 Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
106 return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
107 fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
110 Int_t AliMUONResponseV0::DigitResponse(Int_t digit)
112 // add white noise and do zero-suppression and signal truncation
113 Float_t meanNoise = gRandom->Gaus(1, 0.2);
114 Float_t noise = gRandom->Gaus(0, meanNoise);
116 if ( digit <= ZeroSuppression()) digit = 0;
117 if ( digit > MaxAdc()) digit=MaxAdc();