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 1.7 2002/02/21 16:09:45 morsch
19 Move SetHighwaterMark() after last possible SetTrack()
21 Revision 1.6 2002/02/01 15:28:22 morsch
22 Fastidious print statements removed.
24 Revision 1.5 2002/02/01 14:12:28 morsch
25 Include new gas pressure estimates (LHC Pproject Note 273)
27 Revision 1.4 2001/12/19 16:30:24 morsch
28 Some bugs corrected and skip method added. (Rachid Guernane)
30 Revision 1.3 2001/07/27 17:09:36 morsch
31 Use local SetTrack, KeepTrack and SetHighWaterMark methods
32 to delegate either to local stack or to stack owned by AliRun.
33 (Piotr Skowronski, A.M.)
35 Revision 1.2 2001/06/14 12:15:27 morsch
36 Bugs corrected. SetSide() method added.
38 Revision 1.1 2001/01/23 15:04:33 morsch
39 Generator to read beam halo file from Protvino group.
43 // Read background particles from a boundary source
44 // Very specialized generator to simulate background from beam halo.
45 // The input file is a text file specially prepared
47 // Author: andreas.morsch@cern.ch
49 #include "AliGenHaloProtvino.h"
54 #include <TDatabasePDG.h>
58 ClassImp(AliGenHaloProtvino)
59 AliGenHaloProtvino::AliGenHaloProtvino()
64 fName = "HaloProtvino";
65 fTitle = "Halo from LHC Tunnel";
75 AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart)
80 fTitle= "Halo from LHC Tunnel";
89 AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino)
95 //____________________________________________________________
96 AliGenHaloProtvino::~AliGenHaloProtvino()
101 //____________________________________________________________
102 void AliGenHaloProtvino::Init()
105 fFile = fopen(fFileName,"r");
107 printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), fFile);
109 printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), fFile);
114 // Read file with gas pressure values
117 name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" );
118 FILE* file = fopen(name, "r");
125 for (i = 0; i < 20; i++)
127 fscanf(file, "%f %f %f %f %f %f", &z,
128 &fG1[i][0], &fG1[i][1], &fG1[i][2], &fG1[i][3], &fG1[i][4]);
130 fZ1[i] = fZ1[i-1] + z;
138 for (i = 0; i < 21; i++)
140 fscanf(file, "%f %f %f %f %f %f", &z,
141 &fG2[i][0], &fG2[i][1], &fG2[i][2], &fG2[i][3], &fG2[i][4]);
143 fZ2[i] = fZ2[i-1] + z;
149 // Transform into interaction rates
151 const Float_t crossSection = 0.094e-28; // m^2
152 const Float_t pFlux = 1.e11/25.e-9; // 1/s
154 for (j = 0; j < 5; j++) {
155 for (i = 0; i < 21; i++)
158 fG1[i][j] = fG1[i][j] * crossSection * pFlux; // 1/m/s
159 fG2[i][j] = fG2[i][j] * crossSection * pFlux; // 1/m/s
166 for (Int_t i = 0; i < 250; i++) {
167 Float_t z = 20.+i*1.;
169 Float_t wgt = GassPressureWeight(z);
173 printf("\n %f \n \n", sum);
176 //____________________________________________________________
177 void AliGenHaloProtvino::Generate()
179 // Generate from input file
181 Float_t polar[3]= {0,0,0};
184 Float_t ekin, wgt, tx, ty, tz, txy;
189 Int_t ipart, ncols, nt;
193 ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f",
194 &zPrimary, &inuc, &ipart, &wgt,
195 &ekin, &origin[0], &origin[1],
198 printf(" \n %f %d %d %f %f %f %f %f %f",
199 zPrimary, inuc, ipart, wgt,
200 ekin, origin[0], origin[1],
204 if (ncols < 0) break;
207 if (fNpart !=-1 && nskip <= fNskip) continue;
210 if (fNpart !=-1 && nread > fNpart) break;
212 amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
217 p0=sqrt(ekin*ekin + 2.*amass*ekin);
219 txy=TMath::Sqrt(tx*tx+ty*ty);
223 tz=-TMath::Sqrt(1.-txy);
236 Float_t originP[3] = {0., 0., 0.};
237 originP[2] = zPrimary;
239 Float_t pP[3] = {0., 0., 0.};
243 originP[2] = -zPrimary;
244 origin[2] = -origin[2];
248 SetTrack(0,-1,kProton,pP,originP,polar,0,kPNoProcess,ntP);
250 fParentWeight=wgt*GassPressureWeight(zPrimary);
251 SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
253 // Assume particles come from two directions with same probability
255 // Both Side are considered
257 origin[2]=-origin[2];
259 fParentWeight=wgt*GassPressureWeight(-zPrimary);
260 SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
262 SetHighWaterMark(nt);
267 AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs)
269 // Assignment operator
275 Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary)
278 // Return z-dependent gasspressure weight = interaction rate [1/m/s].
282 Float_t zAbs = TMath::Abs(zPrimary);
283 zPrimary = TMath::Abs(zPrimary);
287 if (zAbs > fZ1[19]) {
290 for (Int_t i = 1; i < 20; i++) {
292 weight = fG1[i][fRunPeriod];
298 if (zAbs > fZ2[20]) {
301 for (Int_t i = 1; i < 21; i++) {
303 weight = fG2[i][fRunPeriod];
314 # Title: README file for the sources of IR8 machine induced background
315 # Author: Vadim Talanov <Vadim.Talanov@cern.ch>
316 # Modified: 12-12-2000
320 There are three files, named ring.one.beta.[01,10,50].m, which
321 contain the lists of background particles, induced by proton losses
322 upstream of IP8 in the LHC ring one, for the beta* values of 1, 10
323 and 50 m, respectively.
327 Each line in the files contains the coordinates of particle track
328 crossing with the infinite plane, positioned at z=-1m, together with
329 the physical properties of corresponding particle, namely:
331 S - S coordinate of the primary interaction vertex, cm;
332 N - type of the gas nuclei at interaction, 1 is H, 2 - C and 3 - O;
333 I - particle ID in PDG particle numbering scheme;
335 E - particle kinetic energy, GeV;
336 X - x coordinate of the crossing point, cm;
337 Y - y coordinate of the crossing point, cm;
338 Dx - x direction cosine;
339 Dy - y direction cosine.
343 Each file is given per unity of linear density of proton inelastic
344 interactions with the gas nuclei, [1 inelastic interaction/m].
346 # ~/vtalanov/public/README.mib: the end.