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4bda3bc1 | 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 | /* $Id$ */ |
4bda3bc1 | 17 | |
508eeb68 | 18 | // |
19 | // Generator to simulate beam gas interactions. | |
20 | // At present single interactions are read from an external file. | |
21 | // Several interactions are combined in one event. | |
4bda3bc1 | 22 | |
23 | ||
24 | #include "AliGenBeamGas.h" | |
25 | #include "AliRun.h" | |
26 | ||
27 | #include <TParticle.h> | |
28 | #include <TFile.h> | |
29 | #include <TTree.h> | |
30 | ||
31 | ||
32 | ClassImp(AliGenBeamGas) | |
33 | ||
34 | AliGenBeamGas::AliGenBeamGas() | |
35 | :AliGenExtFile() | |
36 | { | |
37 | // Constructor | |
38 | // | |
39 | fInteractions = 1; | |
508eeb68 | 40 | fOsigma[0] = 0.; |
41 | fOsigma[1] = 0.; | |
42 | fOsigma[2] = 2000.; | |
4bda3bc1 | 43 | } |
44 | ||
45 | AliGenBeamGas::AliGenBeamGas(const AliGenBeamGas & ExtFile) | |
46 | { | |
47 | // copy constructor | |
48 | } | |
49 | //____________________________________________________________ | |
50 | ||
51 | AliGenBeamGas::~AliGenBeamGas() | |
52 | { | |
53 | // Destructor | |
54 | delete fReader; | |
55 | } | |
56 | ||
57 | //___________________________________________________________ | |
58 | void AliGenBeamGas::Init() | |
59 | { | |
60 | // Initialize | |
61 | AliGenExtFile::Init(); | |
62 | } | |
63 | ||
64 | ||
65 | void AliGenBeamGas::Generate() | |
66 | { | |
67 | // Generate particles | |
68 | ||
69 | Float_t polar[3] = {0,0,0}; | |
70 | Float_t origin[3] = {0,0,0}; | |
71 | Float_t p[3]; | |
72 | Float_t random[2]; | |
73 | Int_t i, nt; | |
74 | Int_t nInt = 0; | |
75 | ||
76 | while(nInt < fInteractions) { | |
77 | // | |
78 | Rndm(random,2); | |
79 | // | |
80 | // Interaction vertex | |
81 | // | |
508eeb68 | 82 | origin[2] = 2. * fOsigma[2] * random[0] - fOsigma[2]; |
4bda3bc1 | 83 | // |
84 | // beam 1 or 2 | |
85 | // | |
86 | Float_t ibeam = (random[1] < 0.5) ? -1. : 1.; | |
87 | ||
88 | // | |
89 | // Read next event | |
90 | // | |
91 | Int_t nTracks = fReader->NextEvent(); | |
92 | if (nTracks == 0) { | |
93 | // printf("\n No more events !!! !\n"); | |
94 | Warning("AliGenBeamGas::Generate", | |
95 | "\nNo more events in external file!!!\n Last event may be empty or incomplete.\n"); | |
96 | return; | |
97 | } | |
98 | ||
99 | // | |
100 | // Stack filling loop | |
101 | // | |
102 | for (i = 0; i < nTracks; i++) { | |
103 | TParticle* iparticle = fReader->NextParticle(); | |
104 | p[0] = iparticle->Px(); | |
105 | p[1] = iparticle->Py(); | |
106 | p[2] = iparticle->Pz() * ibeam; | |
107 | ||
108 | Int_t idpart = iparticle->GetPdgCode(); | |
109 | Int_t decayed = iparticle->GetFirstDaughter(); | |
110 | Int_t doTracking = fTrackIt && (decayed < 0) && (TMath::Abs(idpart) > 10); | |
111 | SetTrack(doTracking,-1,idpart,p,origin,polar,0,kPPrimary,nt); | |
112 | KeepTrack(nt); | |
113 | } // track loop | |
114 | nInt++; | |
115 | } // event loop | |
116 | // | |
117 | SetHighWaterMark(nt); | |
118 | // | |
119 | CdEventFile(); | |
120 | } | |
121 | ||
122 | ||
123 | //AliGenBeamGas& AliGenBeamGas::operator=(const AliGenBeamGas& rhs) | |
124 | //{ | |
125 | // Assignment operator | |
126 | // return *this; | |
127 | //} | |
128 | ||
129 | ||
130 | ||
131 | ||
132 | ||
133 | ||
134 | ||
135 |