]>
Commit | Line | Data |
---|---|---|
4c039060 | 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 | ||
803d1ab0 | 16 | /* $Id$ */ |
4c039060 | 17 | |
675e9664 | 18 | // Read background particles from a boundary source |
19 | // Very specialized generator to simulate background from beam halo. | |
20 | // The input file is a text file specially prepared | |
21 | // for this purpose. | |
22 | // Author: andreas.morsch@cern.ch | |
23 | ||
116cbefd | 24 | #include <stdlib.h> |
c5970876 | 25 | |
1578254f | 26 | #include <TDatabasePDG.h> |
116cbefd | 27 | #include <TPDGCode.h> |
28 | ||
29 | #include "AliGenHalo.h" | |
30 | #include "AliRun.h" | |
f87cfe57 | 31 | |
198bb1c7 | 32 | ClassImp(AliGenHalo) |
33 | ||
34 | AliGenHalo::AliGenHalo() | |
35 | :AliGenerator(-1) | |
fe4da5cc | 36 | { |
f87cfe57 | 37 | // Constructor |
fe4da5cc | 38 | fName="Halo"; |
39 | fTitle="Halo from LHC Tunnel"; | |
fe4da5cc | 40 | // |
41 | // Read all particles | |
42 | fNpart=-1; | |
43 | fp=0; | |
44 | } | |
45 | ||
46 | AliGenHalo::AliGenHalo(Int_t npart) | |
47 | :AliGenerator(npart) | |
48 | { | |
f87cfe57 | 49 | // Constructor |
fe4da5cc | 50 | fName="Halo"; |
51 | fTitle="Halo from LHC Tunnel"; | |
fe4da5cc | 52 | // |
53 | // Read all particles | |
54 | fNpart=-1; | |
55 | fp=0; | |
56 | } | |
57 | ||
f87cfe57 | 58 | AliGenHalo::AliGenHalo(const AliGenHalo & Halo) |
198bb1c7 | 59 | :AliGenerator(Halo) |
f87cfe57 | 60 | { |
198bb1c7 | 61 | // Copy constructor |
62 | Halo.Copy(*this); | |
f87cfe57 | 63 | } |
64 | ||
65 | ||
fe4da5cc | 66 | //____________________________________________________________ |
67 | AliGenHalo::~AliGenHalo() | |
68 | { | |
f87cfe57 | 69 | // Destructor |
fe4da5cc | 70 | } |
71 | ||
72 | //____________________________________________________________ | |
73 | void AliGenHalo::Init() | |
f87cfe57 | 74 | { |
75 | // Initialisation | |
76 | } | |
fe4da5cc | 77 | |
78 | //____________________________________________________________ | |
79 | void AliGenHalo::Generate() | |
80 | { | |
f87cfe57 | 81 | // Generate from input file |
fe4da5cc | 82 | FILE *fp = fopen(fFileName,"r"); |
83 | if (fp) { | |
bd1cece1 | 84 | printf("\n File %s opened for reading ! \n ", (char*) &fFileName); |
fe4da5cc | 85 | } else { |
bd1cece1 | 86 | printf("\n Opening of file %s failed ! \n ", (char*) &fFileName); |
fe4da5cc | 87 | } |
88 | // | |
89 | // MARS particle codes | |
f87cfe57 | 90 | const Int_t kmars[12]={0,kProton,kNeutron,kPiPlus,kPiMinus,kKPlus,kKMinus, |
1578254f | 91 | kMuonPlus,kMuonMinus,kGamma,kElectron,kPositron}; |
fe4da5cc | 92 | |
93 | Float_t polar[3]= {0,0,0}; | |
94 | Float_t origin[3]; | |
95 | Float_t p[3], p0; | |
96 | Float_t ekin, wgt, tx, ty, tz, txy; | |
1578254f | 97 | Float_t amass; |
fe4da5cc | 98 | // |
1578254f | 99 | Int_t ipart, ncols, nt; |
fe4da5cc | 100 | |
101 | Int_t nread=0; | |
102 | origin[2]=2650; | |
103 | ||
104 | while(1) { | |
105 | ncols = fscanf(fp,"%i %f %f %f %f %f %f", | |
106 | &ipart, &ekin, &wgt, | |
107 | &origin[0], &origin[1], | |
108 | &tx, &ty); | |
109 | if (ncols < 0) break; | |
110 | nread++; | |
111 | if (fNpart !=-1 && nread > fNpart) break; | |
f87cfe57 | 112 | ipart = kmars[ipart]; |
1578254f | 113 | amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass(); |
fe4da5cc | 114 | p0=sqrt(ekin*ekin + 2.*amass); |
115 | ||
116 | txy=TMath::Sqrt(tx*tx+ty*ty); | |
117 | if (txy == 1.) { | |
118 | tz=0; | |
119 | } else { | |
120 | tz=-TMath::Sqrt(1.-txy); | |
121 | } | |
122 | p[0]=p0*tx; | |
123 | p[1]=p0*ty; | |
124 | p[2]=p0*tz; | |
125 | fParentWeight=wgt; | |
642f15cf | 126 | PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); |
127 | // PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,"Halo+",nt,fParentWeight); | |
fe4da5cc | 128 | origin[2]=-origin[2]; |
129 | p[2]=-p[2]; | |
642f15cf | 130 | PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); |
131 | // PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,"Halo-",nt,fParentWeight); | |
fe4da5cc | 132 | origin[2]=-origin[2]; |
133 | p[2]=-p[2]; | |
134 | } | |
135 | } | |
136 | ||
137 | ||
f87cfe57 | 138 | AliGenHalo& AliGenHalo::operator=(const AliGenHalo& rhs) |
139 | { | |
140 | // Assignment operator | |
198bb1c7 | 141 | rhs.Copy(*this); |
f87cfe57 | 142 | return *this; |
143 | } | |
144 | ||
fe4da5cc | 145 | |
198bb1c7 | 146 | void AliGenHalo::Copy(AliGenHalo&) const |
147 | { | |
148 | // | |
149 | // Copy | |
150 | // | |
151 | Fatal("Copy","Not implemented!\n"); | |
152 | } | |
153 | ||
154 | ||
fe4da5cc | 155 | |
156 | ||
157 | ||
158 | ||
159 | ||
160 |