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d02055c6 | 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 | $Log$ | |
058d4fc8 | 18 | Revision 1.1 2007/06/24 20:53:11 hristov |
19 | New generator for the krypton runs of TPC (Marek) | |
20 | ||
d02055c6 | 21 | */ |
22 | ||
23 | // | |
24 | // generates single Kr decay, in order to generate the calibration data | |
25 | // one should use it together with the AliGenCocktail class | |
26 | // | |
27 | #include "AliGenKrypton.h" | |
28 | #include "TPDGCode.h" | |
29 | // | |
30 | ClassImp(AliGenKrypton) | |
31 | ||
32 | //________________________________________________________________________ | |
33 | AliGenKrypton::AliGenKrypton(){ | |
34 | // | |
35 | // Default constructor | |
36 | // | |
37 | } | |
38 | //________________________________________________________________________ | |
39 | void AliGenKrypton::Generate(){ | |
40 | Double_t eelectron[6]; | |
41 | Double_t egamma[2]; | |
42 | Float_t polar[3]={0.,0.,0.}; | |
43 | Int_t nelectron, ngamma; | |
44 | Int_t nt; | |
45 | // | |
46 | // generate decay vertex within the gas TPC volume | |
47 | // | |
48 | Float_t rmin,rmax,zmax; | |
49 | zmax=249.7; | |
50 | rmin=78.8; | |
51 | rmax=258.; | |
52 | Float_t me=511.e-6; | |
53 | Double_t rnd; | |
54 | // | |
55 | rnd=gRandom->Rndm(); | |
56 | Float_t r = (rmax-rmin)*rnd+rmin; | |
57 | rnd=gRandom->Rndm(); | |
58 | Float_t phi=TMath::TwoPi()*rnd; | |
59 | // | |
60 | Float_t origin[3]; | |
61 | // | |
62 | rnd=gRandom->Rndm(); | |
63 | origin[2]=zmax*(2.*rnd-1.); | |
64 | origin[0]=r*TMath::Cos(phi); | |
65 | origin[1]=r*TMath::Sin(phi); | |
66 | // | |
67 | Float_t ptot,p[3]; | |
68 | // | |
69 | // generate decay | |
70 | // | |
71 | KrDecay(nelectron,ngamma,eelectron,egamma); | |
72 | // | |
73 | // electrons | |
74 | // | |
75 | for(Int_t i=0;i<nelectron;i++){ | |
76 | rnd=gRandom->Rndm(); | |
058d4fc8 | 77 | phi=TMath::TwoPi()*rnd; |
d02055c6 | 78 | rnd=gRandom->Rndm(); |
058d4fc8 | 79 | Double_t theta = TMath::Pi()*rnd; |
80 | ptot=TMath::Sqrt(eelectron[i]*(eelectron[i]+2.*me)); | |
81 | p[0]=ptot*TMath::Cos(phi)*TMath::Sin(theta); | |
82 | p[1]=ptot*TMath::Sin(phi)*TMath::Sin(theta); | |
83 | p[2]=ptot*TMath::Cos(theta); | |
d02055c6 | 84 | // |
85 | // her push particle | |
86 | // | |
87 | PushTrack(fTrackIt,-1,kElectron,p,origin,polar,0,kPPrimary,nt); | |
88 | } | |
89 | // | |
90 | // gammas | |
91 | // | |
92 | for(Int_t i=0;i<ngamma;i++){ | |
93 | rnd=gRandom->Rndm(); | |
94 | phi=TMath::TwoPi()*rnd; | |
95 | ptot=egamma[i]; | |
96 | p[0]=ptot*TMath::Cos(phi); | |
97 | p[1]=ptot*TMath::Sin(phi); | |
98 | rnd=gRandom->Rndm(); | |
99 | p[2]=ptot*TMath::Cos(TMath::Pi()*rnd); | |
100 | // | |
101 | // her push particle | |
102 | // | |
103 | PushTrack(fTrackIt,-1,kGamma,p,origin,polar,0,kPPrimary,nt); | |
104 | } | |
105 | } | |
106 | //________________________________________________________________________ | |
107 | void AliGenKrypton::KrDecay(Int_t &nelectron, Int_t &ngamma, Double_t *eelectron, Double_t *egamma) | |
108 | { | |
109 | Double_t prob1[2]={0.76,0.88}; // 0.76, 0.12, 0.12 | |
110 | Double_t prob2=0.95; // 0.95, 0.05 | |
111 | nelectron=0; | |
112 | ngamma=0; | |
113 | ||
114 | Double_t rnd; | |
115 | rnd = gRandom->Rndm(); | |
116 | // | |
117 | // | |
118 | // first decay - 32 keV | |
119 | // | |
120 | if(rnd < prob1[0]) { | |
121 | // 2 electrons | |
122 | nelectron = 2; | |
123 | eelectron[0]=30.e-6; | |
124 | eelectron[1]=1.8e-6; | |
125 | } | |
126 | else if (rnd > prob1[1]){ | |
127 | // 4 electrons | |
128 | nelectron=4; | |
129 | eelectron[0]=18.e-6; | |
130 | eelectron[1]=10.e-6; | |
131 | eelectron[2]=1.8e-6; | |
132 | eelectron[3]=1.8e-6; | |
133 | } | |
134 | else { | |
135 | // 2 electrons + 1 gamma | |
136 | nelectron = 2; | |
137 | ngamma = 1; | |
138 | eelectron[0]=18.e-6; | |
139 | eelectron[1]=1.8e-6; | |
140 | egamma[0]=12.e-6; | |
141 | } | |
142 | // | |
143 | // second decay - 9 keV | |
144 | // | |
145 | rnd=gRandom->Rndm(); | |
146 | // | |
147 | if(rnd < prob2){ | |
148 | // 2 electrons | |
149 | nelectron+=2; | |
150 | eelectron[nelectron-2]=7.6e-6; | |
151 | eelectron[nelectron-1]=1.8e-6; | |
152 | } | |
153 | else { | |
154 | ngamma++; | |
155 | egamma[ngamma-1]=9.e-6; | |
156 | } | |
157 | } | |
158 | //________________________________________________________________________ |