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14ab5373 | 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 | $Log$ | |
a99cf51f | 18 | Revision 1.2 2001/06/14 12:15:27 morsch |
19 | Bugs corrected. SetSide() method added. | |
20 | ||
154d524b | 21 | Revision 1.1 2001/01/23 15:04:33 morsch |
22 | Generator to read beam halo file from Protvino group. | |
23 | ||
14ab5373 | 24 | */ |
25 | ||
26 | // Read background particles from a boundary source | |
27 | // Very specialized generator to simulate background from beam halo. | |
28 | // The input file is a text file specially prepared | |
29 | // for this purpose. | |
30 | // Author: andreas.morsch@cern.ch | |
31 | ||
32 | #include "AliGenHaloProtvino.h" | |
33 | #include "AliRun.h" | |
34 | #include "AliMC.h" | |
35 | #include "AliPDG.h" | |
36 | ||
37 | #include <TDatabasePDG.h> | |
38 | #include <stdlib.h> | |
39 | ||
40 | ClassImp(AliGenHaloProtvino) | |
41 | AliGenHaloProtvino::AliGenHaloProtvino() | |
42 | :AliGenerator(-1) | |
43 | { | |
44 | // Constructor | |
154d524b | 45 | printf("\n Calling Default Constructor"); |
46 | ||
47 | fName = "HaloProtvino"; | |
48 | fTitle = "Halo from LHC Tunnel"; | |
14ab5373 | 49 | // |
50 | // Read all particles | |
154d524b | 51 | fNpart = -1; |
52 | fFile = 0; | |
53 | fSide = 1; | |
14ab5373 | 54 | } |
55 | ||
56 | AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart) | |
57 | :AliGenerator(npart) | |
58 | { | |
59 | // Constructor | |
154d524b | 60 | printf("\n Calling Constructor"); |
61 | fName = "Halo"; | |
62 | fTitle= "Halo from LHC Tunnel"; | |
14ab5373 | 63 | // |
154d524b | 64 | fNpart = npart; |
65 | fFile = 0; | |
66 | fSide = 1; | |
14ab5373 | 67 | } |
68 | ||
69 | AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino) | |
70 | { | |
71 | // copy constructor | |
72 | } | |
73 | ||
74 | ||
75 | //____________________________________________________________ | |
76 | AliGenHaloProtvino::~AliGenHaloProtvino() | |
77 | { | |
78 | // Destructor | |
79 | } | |
80 | ||
81 | //____________________________________________________________ | |
82 | void AliGenHaloProtvino::Init() | |
83 | { | |
84 | // Initialisation | |
154d524b | 85 | fFile = fopen(fFileName,"r"); |
86 | if (fFile) { | |
87 | printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), fFile); | |
88 | } else { | |
89 | printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), fFile); | |
90 | } | |
14ab5373 | 91 | } |
92 | ||
93 | //____________________________________________________________ | |
94 | void AliGenHaloProtvino::Generate() | |
95 | { | |
96 | // Generate from input file | |
14ab5373 | 97 | |
98 | Float_t polar[3]= {0,0,0}; | |
99 | Float_t origin[3]; | |
100 | Float_t p[3], p0; | |
101 | Float_t ekin, wgt, tx, ty, tz, txy; | |
102 | Float_t zPrimary; | |
103 | Float_t amass; | |
104 | Int_t inuc; | |
105 | // | |
106 | Int_t ipart, ncols, nt; | |
154d524b | 107 | Int_t nread = 0; |
14ab5373 | 108 | while(1) { |
154d524b | 109 | ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f", |
14ab5373 | 110 | &zPrimary, &inuc, &ipart, &wgt, |
111 | &ekin, &origin[0], &origin[1], | |
112 | &tx, &ty); | |
154d524b | 113 | /* |
14ab5373 | 114 | printf(" \n %f %d %d %f %f %f %f %f %f", |
115 | zPrimary, inuc, ipart, wgt, | |
116 | ekin, origin[0], origin[1], | |
117 | tx, ty); | |
154d524b | 118 | */ |
14ab5373 | 119 | if (ncols < 0) break; |
120 | nread++; | |
154d524b | 121 | |
14ab5373 | 122 | if (fNpart !=-1 && nread > fNpart) break; |
123 | ||
124 | ||
125 | ||
126 | amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass(); | |
127 | ||
128 | // | |
129 | // Momentum vector | |
130 | // | |
131 | p0=sqrt(ekin*ekin + 2.*amass); | |
132 | ||
133 | txy=TMath::Sqrt(tx*tx+ty*ty); | |
134 | if (txy == 1.) { | |
135 | tz=0; | |
136 | } else { | |
137 | tz=-TMath::Sqrt(1.-txy); | |
138 | } | |
139 | ||
140 | p[0]=p0*tx; | |
141 | p[1]=p0*ty; | |
154d524b | 142 | p[2]=-p0*tz; |
143 | ||
144 | origin[2] = 21.965; | |
14ab5373 | 145 | |
146 | // | |
147 | // | |
148 | // Particle weight | |
149 | ||
154d524b | 150 | Float_t originP[3] = {0., 0., 0.}; |
151 | originP[2] = zPrimary; | |
152 | ||
153 | Float_t pP[3] = {0., 0., 0.}; | |
154 | Int_t ntP; | |
155 | ||
156 | if (fSide == -1) { | |
157 | originP[2] = -zPrimary; | |
158 | origin[2] = -origin[2]; | |
159 | p[2] = -p[2]; | |
160 | } | |
161 | ||
a99cf51f | 162 | SetTrack(0,-1,kProton,pP,originP,polar,0,kPNoProcess,ntP); |
163 | KeepTrack(ntP); | |
14ab5373 | 164 | fParentWeight=wgt*GassPressureWeight(zPrimary); |
a99cf51f | 165 | SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); |
166 | SetHighWaterMark(nt); | |
154d524b | 167 | |
14ab5373 | 168 | // |
169 | // Assume particles come from two directions with same probability | |
154d524b | 170 | |
14ab5373 | 171 | origin[2]=-origin[2]; |
172 | p[2]=-p[2]; | |
173 | fParentWeight=wgt*GassPressureWeight(-zPrimary); | |
a99cf51f | 174 | SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); |
14ab5373 | 175 | origin[2]=-origin[2]; |
176 | p[2]=-p[2]; | |
154d524b | 177 | origin[2]=-origin[2]; |
14ab5373 | 178 | } |
179 | } | |
180 | ||
181 | ||
182 | AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs) | |
183 | { | |
184 | // Assignment operator | |
185 | return *this; | |
186 | } | |
187 | ||
188 | ||
189 | Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary) | |
190 | { | |
191 | // Return z-dependent gasspressure weight | |
192 | // | |
154d524b | 193 | Float_t weight = 500.; |
194 | ||
195 | if (zPrimary > 45000.) weight = 2.e4; | |
196 | ||
197 | return weight; | |
14ab5373 | 198 | } |
199 | ||
200 | /* | |
201 | # Title: README file for the sources of IR8 machine induced background | |
202 | # Author: Vadim Talanov <Vadim.Talanov@cern.ch> | |
203 | # Modified: 12-12-2000 | |
204 | ||
205 | 0. Overview | |
206 | ||
207 | There are three files, named ring.one.beta.[01,10,50].m, which | |
208 | contain the lists of background particles, induced by proton losses | |
209 | upstream of IP8 in the LHC ring one, for the beta* values of 1, 10 | |
210 | and 50 m, respectively. | |
211 | ||
212 | 1. File contents | |
213 | ||
214 | Each line in the files contains the coordinates of particle track | |
215 | crossing with the infinite plane, positioned at z=-1m, together with | |
216 | the physical properties of corresponding particle, namely: | |
217 | ||
218 | S - S coordinate of the primary interaction vertex, cm; | |
219 | N - type of the gas nuclei at interaction, 1 is H, 2 - C and 3 - O; | |
220 | I - particle ID in PDG particle numbering scheme; | |
221 | W - particle weight; | |
222 | E - particle kinetic energy, GeV; | |
223 | X - x coordinate of the crossing point, cm; | |
224 | Y - y coordinate of the crossing point, cm; | |
225 | Dx - x direction cosine; | |
226 | Dy - y direction cosine. | |
227 | ||
228 | 2. Normalisation | |
229 | ||
230 | Each file is given per unity of linear density of proton inelastic | |
231 | interactions with the gas nuclei, [1 inelastic interaction/m]. | |
232 | ||
233 | # ~/vtalanov/public/README.mib: the end. | |
234 | ||
235 | */ | |
236 | ||
237 | ||
238 | ||
239 |