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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 | $Log$ |
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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 | |
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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 |
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45 | printf("\n Calling Default Constructor"); |
46 | |
47 | fName = "HaloProtvino"; |
48 | fTitle = "Halo from LHC Tunnel"; |
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49 | // |
50 | // Read all particles |
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51 | fNpart = -1; |
52 | fFile = 0; |
53 | fSide = 1; |
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54 | } |
55 | |
56 | AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart) |
57 | :AliGenerator(npart) |
58 | { |
59 | // Constructor |
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60 | printf("\n Calling Constructor"); |
61 | fName = "Halo"; |
62 | fTitle= "Halo from LHC Tunnel"; |
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63 | // |
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64 | fNpart = npart; |
65 | fFile = 0; |
66 | fSide = 1; |
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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 |
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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 | } |
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91 | } |
92 | |
93 | //____________________________________________________________ |
94 | void AliGenHaloProtvino::Generate() |
95 | { |
96 | // Generate from input file |
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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; |
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107 | Int_t nread = 0; |
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108 | while(1) { |
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109 | ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f", |
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110 | &zPrimary, &inuc, &ipart, &wgt, |
111 | &ekin, &origin[0], &origin[1], |
112 | &tx, &ty); |
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113 | /* |
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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); |
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118 | */ |
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119 | if (ncols < 0) break; |
120 | nread++; |
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121 | |
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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; |
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142 | p[2]=-p0*tz; |
143 | |
144 | origin[2] = 21.965; |
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145 | |
146 | // |
147 | // |
148 | // Particle weight |
149 | |
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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 | |
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162 | SetTrack(0,-1,kProton,pP,originP,polar,0,kPNoProcess,ntP); |
163 | KeepTrack(ntP); |
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164 | fParentWeight=wgt*GassPressureWeight(zPrimary); |
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165 | SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); |
166 | SetHighWaterMark(nt); |
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167 | |
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168 | // |
169 | // Assume particles come from two directions with same probability |
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170 | |
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171 | origin[2]=-origin[2]; |
172 | p[2]=-p[2]; |
173 | fParentWeight=wgt*GassPressureWeight(-zPrimary); |
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174 | SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); |
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175 | origin[2]=-origin[2]; |
176 | p[2]=-p[2]; |
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177 | origin[2]=-origin[2]; |
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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 | // |
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193 | Float_t weight = 500.; |
194 | |
195 | if (zPrimary > 45000.) weight = 2.e4; |
196 | |
197 | return weight; |
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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 | |