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 1.4 2001/12/19 16:30:24 morsch
19 Some bugs corrected and skip method added. (Rachid Guernane)
21 Revision 1.3 2001/07/27 17:09:36 morsch
22 Use local SetTrack, KeepTrack and SetHighWaterMark methods
23 to delegate either to local stack or to stack owned by AliRun.
24 (Piotr Skowronski, A.M.)
26 Revision 1.2 2001/06/14 12:15:27 morsch
27 Bugs corrected. SetSide() method added.
29 Revision 1.1 2001/01/23 15:04:33 morsch
30 Generator to read beam halo file from Protvino group.
34 // Read background particles from a boundary source
35 // Very specialized generator to simulate background from beam halo.
36 // The input file is a text file specially prepared
38 // Author: andreas.morsch@cern.ch
40 #include "AliGenHaloProtvino.h"
45 #include <TDatabasePDG.h>
49 ClassImp(AliGenHaloProtvino)
50 AliGenHaloProtvino::AliGenHaloProtvino()
54 printf("\n Calling Default Constructor");
56 fName = "HaloProtvino";
57 fTitle = "Halo from LHC Tunnel";
67 AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart)
71 printf("\n Calling Constructor");
73 fTitle= "Halo from LHC Tunnel";
82 AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino)
88 //____________________________________________________________
89 AliGenHaloProtvino::~AliGenHaloProtvino()
94 //____________________________________________________________
95 void AliGenHaloProtvino::Init()
98 fFile = fopen(fFileName,"r");
100 printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), fFile);
102 printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), fFile);
107 // Read file with gas pressure values
110 name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" );
111 FILE* file = fopen(name, "r");
118 for (i = 0; i < 20; i++)
120 fscanf(file, "%f %f %f %f %f %f", &z,
121 &fG1[i][0], &fG1[i][1], &fG1[i][2], &fG1[i][3], &fG1[i][4]);
123 fZ1[i] = fZ1[i-1] + z;
131 for (i = 0; i < 21; i++)
133 fscanf(file, "%f %f %f %f %f %f", &z,
134 &fG2[i][0], &fG2[i][1], &fG2[i][2], &fG2[i][3], &fG2[i][4]);
136 fZ2[i] = fZ2[i-1] + z;
142 // Transform into interaction rates
144 const Float_t crossSection = 0.094e-28; // m^2
145 const Float_t pFlux = 1.e11/25.e-9; // 1/s
147 for (j = 0; j < 5; j++) {
148 for (i = 0; i < 21; i++)
151 fG1[i][j] = fG1[i][j] * crossSection * pFlux; // 1/m/s
152 fG2[i][j] = fG2[i][j] * crossSection * pFlux; // 1/m/s
159 for (Int_t i = 0; i < 250; i++) {
160 Float_t z = 20.+i*1.;
162 Float_t wgt = GassPressureWeight(z);
163 printf("\n %f %f", z, wgt);
167 printf("\n %f \n \n", sum);
170 //____________________________________________________________
171 void AliGenHaloProtvino::Generate()
173 // Generate from input file
175 Float_t polar[3]= {0,0,0};
178 Float_t ekin, wgt, tx, ty, tz, txy;
183 Int_t ipart, ncols, nt;
187 ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f",
188 &zPrimary, &inuc, &ipart, &wgt,
189 &ekin, &origin[0], &origin[1],
192 printf(" \n %f %d %d %f %f %f %f %f %f",
193 zPrimary, inuc, ipart, wgt,
194 ekin, origin[0], origin[1],
198 if (ncols < 0) break;
201 if (fNpart !=-1 && nskip <= fNskip) continue;
204 if (fNpart !=-1 && nread > fNpart) break;
206 amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
211 p0=sqrt(ekin*ekin + 2.*amass*ekin);
213 txy=TMath::Sqrt(tx*tx+ty*ty);
217 tz=-TMath::Sqrt(1.-txy);
230 Float_t originP[3] = {0., 0., 0.};
231 originP[2] = zPrimary;
233 Float_t pP[3] = {0., 0., 0.};
237 originP[2] = -zPrimary;
238 origin[2] = -origin[2];
242 SetTrack(0,-1,kProton,pP,originP,polar,0,kPNoProcess,ntP);
244 fParentWeight=wgt*GassPressureWeight(zPrimary);
245 SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
246 SetHighWaterMark(nt);
249 // Assume particles come from two directions with same probability
251 // Both Side are considered
253 origin[2]=-origin[2];
255 fParentWeight=wgt*GassPressureWeight(-zPrimary);
256 SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
263 AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs)
265 // Assignment operator
271 Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary)
274 // Return z-dependent gasspressure weight = interaction rate [1/m/s].
278 Float_t zAbs = TMath::Abs(zPrimary);
279 zPrimary = TMath::Abs(zPrimary);
283 if (zAbs > fZ1[19]) {
286 for (Int_t i = 1; i < 20; i++) {
288 weight = fG1[i][fRunPeriod];
294 if (zAbs > fZ2[20]) {
297 for (Int_t i = 1; i < 21; i++) {
299 weight = fG2[i][fRunPeriod];
310 # Title: README file for the sources of IR8 machine induced background
311 # Author: Vadim Talanov <Vadim.Talanov@cern.ch>
312 # Modified: 12-12-2000
316 There are three files, named ring.one.beta.[01,10,50].m, which
317 contain the lists of background particles, induced by proton losses
318 upstream of IP8 in the LHC ring one, for the beta* values of 1, 10
319 and 50 m, respectively.
323 Each line in the files contains the coordinates of particle track
324 crossing with the infinite plane, positioned at z=-1m, together with
325 the physical properties of corresponding particle, namely:
327 S - S coordinate of the primary interaction vertex, cm;
328 N - type of the gas nuclei at interaction, 1 is H, 2 - C and 3 - O;
329 I - particle ID in PDG particle numbering scheme;
331 E - particle kinetic energy, GeV;
332 X - x coordinate of the crossing point, cm;
333 Y - y coordinate of the crossing point, cm;
334 Dx - x direction cosine;
335 Dy - y direction cosine.
339 Each file is given per unity of linear density of proton inelastic
340 interactions with the gas nuclei, [1 inelastic interaction/m].
342 # ~/vtalanov/public/README.mib: the end.