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 1.6 2000/12/04 17:48:23 gosset
19 Modifications for stations 1 et 2 mainly:
20 * station 1 with 4 mm gas gap and smaller cathode segmentation...
21 * stations 1 and 2 with "grey" frame crosses
22 * mean noise at 1.5 ADC channel
23 * Ar-CO2 gas (80%+20%)
25 Revision 1.5 2000/11/21 13:47:55 gosset
26 All Mathieson parameters (Sqrt(K3), K2 and K4) set in one function,
27 SetSqrtKx3AndDeriveKx2Kx4 or SetSqrtKx3AndDeriveKx2Kx4,
28 for each cathode plane
30 Revision 1.4 2000/10/25 10:41:52 morsch
31 IntPH(..): Protec Log against random numbers equal to 0.
33 Revision 1.3 2000/07/03 11:54:57 morsch
34 AliMUONSegmentation and AliMUONHitMap have been replaced by AliSegmentation and AliHitMap in STEER
35 The methods GetPadIxy and GetPadXxy of AliMUONSegmentation have changed name to GetPadI and GetPadC.
37 Revision 1.2 2000/06/15 07:58:48 morsch
38 Code from MUON-dev joined
40 Revision 1.1.2.1 2000/06/09 21:33:35 morsch
41 AliMUONResponse code from AliMUONSegResV0.cxx
45 #include "AliMUONResponseV0.h"
46 #include "AliSegmentation.h"
51 ClassImp(AliMUONResponseV0)
53 //__________________________________________________________________________
54 void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
56 // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
57 // in the X direction, perpendicular to the wires,
58 // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
59 // in the same direction
61 fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
62 Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
63 fKx4 = cx1 / fKx2 / fSqrtKx3;
66 //__________________________________________________________________________
67 void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
69 // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
70 // in the Y direction, along the wires,
71 // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
72 // in the same direction
74 fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
75 Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
76 fKy4 = cy1 / fKy2 / fSqrtKy3;
79 Float_t AliMUONResponseV0::IntPH(Float_t eloss)
81 // Calculate charge from given ionization energy loss
83 nel= Int_t(eloss*1.e9/32.);
86 for (Int_t i=1;i<=nel;i++) {
88 while(!arg) arg = gRandom->Rndm();
89 charge -= fChargeSlope*TMath::Log(arg);
93 // -------------------------------------------
95 Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation)
97 // Calculate charge on current pad according to Mathieson distribution
99 const Float_t kInversePitch = 1/fPitch;
101 // Integration limits defined by segmentation model
103 Float_t xi1, xi2, yi1, yi2;
104 segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
105 xi1=xi1*kInversePitch;
106 xi2=xi2*kInversePitch;
107 yi1=yi1*kInversePitch;
108 yi2=yi2*kInversePitch;
110 // The Mathieson function
111 Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
112 Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
114 Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
115 Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
118 return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
119 fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
122 Int_t AliMUONResponseV0::DigitResponse(Int_t digit, AliMUONTransientDigit* where)
124 // add white noise and do zero-suppression and signal truncation
125 // Float_t meanNoise = gRandom->Gaus(1, 0.2);
126 // correct noise for slat chambers;
127 // one more field to add to AliMUONResponseV0 to allow different noises ????
128 Float_t meanNoise = gRandom->Gaus(1.5, 0.2);
129 Float_t noise = gRandom->Gaus(0, meanNoise);
131 if ( digit <= ZeroSuppression()) digit = 0;
132 if ( digit > MaxAdc()) digit=MaxAdc();