1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.5 2002/02/01 14:12:28 morsch
19 Include new gas pressure estimates (LHC Pproject Note 273)
21 Revision 1.4 2001/12/19 16:30:24 morsch
22 Some bugs corrected and skip method added. (Rachid Guernane)
24 Revision 1.3 2001/07/27 17:09:36 morsch
25 Use local SetTrack, KeepTrack and SetHighWaterMark methods
26 to delegate either to local stack or to stack owned by AliRun.
27 (Piotr Skowronski, A.M.)
29 Revision 1.2 2001/06/14 12:15:27 morsch
30 Bugs corrected. SetSide() method added.
32 Revision 1.1 2001/01/23 15:04:33 morsch
33 Generator to read beam halo file from Protvino group.
37 // Read background particles from a boundary source
38 // Very specialized generator to simulate background from beam halo.
39 // The input file is a text file specially prepared
41 // Author: andreas.morsch@cern.ch
43 #include "AliGenHaloProtvino.h"
48 #include <TDatabasePDG.h>
52 ClassImp(AliGenHaloProtvino)
53 AliGenHaloProtvino::AliGenHaloProtvino()
58 fName = "HaloProtvino";
59 fTitle = "Halo from LHC Tunnel";
69 AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart)
74 fTitle= "Halo from LHC Tunnel";
83 AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino)
89 //____________________________________________________________
90 AliGenHaloProtvino::~AliGenHaloProtvino()
95 //____________________________________________________________
96 void AliGenHaloProtvino::Init()
99 fFile = fopen(fFileName,"r");
101 printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), fFile);
103 printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), fFile);
108 // Read file with gas pressure values
111 name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" );
112 FILE* file = fopen(name, "r");
119 for (i = 0; i < 20; i++)
121 fscanf(file, "%f %f %f %f %f %f", &z,
122 &fG1[i][0], &fG1[i][1], &fG1[i][2], &fG1[i][3], &fG1[i][4]);
124 fZ1[i] = fZ1[i-1] + z;
132 for (i = 0; i < 21; i++)
134 fscanf(file, "%f %f %f %f %f %f", &z,
135 &fG2[i][0], &fG2[i][1], &fG2[i][2], &fG2[i][3], &fG2[i][4]);
137 fZ2[i] = fZ2[i-1] + z;
143 // Transform into interaction rates
145 const Float_t crossSection = 0.094e-28; // m^2
146 const Float_t pFlux = 1.e11/25.e-9; // 1/s
148 for (j = 0; j < 5; j++) {
149 for (i = 0; i < 21; i++)
152 fG1[i][j] = fG1[i][j] * crossSection * pFlux; // 1/m/s
153 fG2[i][j] = fG2[i][j] * crossSection * pFlux; // 1/m/s
160 for (Int_t i = 0; i < 250; i++) {
161 Float_t z = 20.+i*1.;
163 Float_t wgt = GassPressureWeight(z);
164 // printf("\n %f %f", z, wgt);
168 printf("\n %f \n \n", sum);
171 //____________________________________________________________
172 void AliGenHaloProtvino::Generate()
174 // Generate from input file
176 Float_t polar[3]= {0,0,0};
179 Float_t ekin, wgt, tx, ty, tz, txy;
184 Int_t ipart, ncols, nt;
188 ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f",
189 &zPrimary, &inuc, &ipart, &wgt,
190 &ekin, &origin[0], &origin[1],
193 printf(" \n %f %d %d %f %f %f %f %f %f",
194 zPrimary, inuc, ipart, wgt,
195 ekin, origin[0], origin[1],
199 if (ncols < 0) break;
202 if (fNpart !=-1 && nskip <= fNskip) continue;
205 if (fNpart !=-1 && nread > fNpart) break;
207 amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
212 p0=sqrt(ekin*ekin + 2.*amass*ekin);
214 txy=TMath::Sqrt(tx*tx+ty*ty);
218 tz=-TMath::Sqrt(1.-txy);
231 Float_t originP[3] = {0., 0., 0.};
232 originP[2] = zPrimary;
234 Float_t pP[3] = {0., 0., 0.};
238 originP[2] = -zPrimary;
239 origin[2] = -origin[2];
243 SetTrack(0,-1,kProton,pP,originP,polar,0,kPNoProcess,ntP);
245 fParentWeight=wgt*GassPressureWeight(zPrimary);
246 SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
247 SetHighWaterMark(nt);
250 // Assume particles come from two directions with same probability
252 // Both Side are considered
254 origin[2]=-origin[2];
256 fParentWeight=wgt*GassPressureWeight(-zPrimary);
257 SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
264 AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs)
266 // Assignment operator
272 Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary)
275 // Return z-dependent gasspressure weight = interaction rate [1/m/s].
279 Float_t zAbs = TMath::Abs(zPrimary);
280 zPrimary = TMath::Abs(zPrimary);
284 if (zAbs > fZ1[19]) {
287 for (Int_t i = 1; i < 20; i++) {
289 weight = fG1[i][fRunPeriod];
295 if (zAbs > fZ2[20]) {
298 for (Int_t i = 1; i < 21; i++) {
300 weight = fG2[i][fRunPeriod];
311 # Title: README file for the sources of IR8 machine induced background
312 # Author: Vadim Talanov <Vadim.Talanov@cern.ch>
313 # Modified: 12-12-2000
317 There are three files, named ring.one.beta.[01,10,50].m, which
318 contain the lists of background particles, induced by proton losses
319 upstream of IP8 in the LHC ring one, for the beta* values of 1, 10
320 and 50 m, respectively.
324 Each line in the files contains the coordinates of particle track
325 crossing with the infinite plane, positioned at z=-1m, together with
326 the physical properties of corresponding particle, namely:
328 S - S coordinate of the primary interaction vertex, cm;
329 N - type of the gas nuclei at interaction, 1 is H, 2 - C and 3 - O;
330 I - particle ID in PDG particle numbering scheme;
332 E - particle kinetic energy, GeV;
333 X - x coordinate of the crossing point, cm;
334 Y - y coordinate of the crossing point, cm;
335 Dx - x direction cosine;
336 Dy - y direction cosine.
340 Each file is given per unity of linear density of proton inelastic
341 interactions with the gas nuclei, [1 inelastic interaction/m].
343 # ~/vtalanov/public/README.mib: the end.