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 1.9 2002/05/28 13:49:17 morsch
19 - Udates for new pressure table
21 - first provisions for real events.
23 Revision 1.8 2002/03/22 13:00:25 morsch
24 Initialize sum to 0. (Jiri Chudoba).
26 Revision 1.7 2002/02/21 16:09:45 morsch
27 Move SetHighwaterMark() after last possible SetTrack()
29 Revision 1.6 2002/02/01 15:28:22 morsch
30 Fastidious print statements removed.
32 Revision 1.5 2002/02/01 14:12:28 morsch
33 Include new gas pressure estimates (LHC Pproject Note 273)
35 Revision 1.4 2001/12/19 16:30:24 morsch
36 Some bugs corrected and skip method added. (Rachid Guernane)
38 Revision 1.3 2001/07/27 17:09:36 morsch
39 Use local SetTrack, KeepTrack and SetHighWaterMark methods
40 to delegate either to local stack or to stack owned by AliRun.
41 (Piotr Skowronski, A.M.)
43 Revision 1.2 2001/06/14 12:15:27 morsch
44 Bugs corrected. SetSide() method added.
46 Revision 1.1 2001/01/23 15:04:33 morsch
47 Generator to read beam halo file from Protvino group.
51 // Read background particles from a boundary source
52 // Very specialized generator to simulate background from beam halo.
53 // The input file is a text file specially prepared
55 // Author: andreas.morsch@cern.ch
57 #include "AliGenHaloProtvino.h"
62 #include <TDatabasePDG.h>
66 ClassImp(AliGenHaloProtvino)
67 AliGenHaloProtvino::AliGenHaloProtvino()
72 fName = "HaloProtvino";
73 fTitle = "Halo from LHC Tunnel";
85 AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart)
90 fTitle= "Halo from LHC Tunnel";
101 AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino)
107 //____________________________________________________________
108 AliGenHaloProtvino::~AliGenHaloProtvino()
113 //____________________________________________________________
114 void AliGenHaloProtvino::Init()
117 fFile = fopen(fFileName,"r");
119 printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), fFile);
121 printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), fFile);
126 // Read file with gas pressure values
129 name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" );
130 FILE* file = fopen(name, "r");
137 for (i = 0; i < 21; i++)
139 fscanf(file, "%f %f %f %f %f %f", &z,
140 &fG1[i][0], &fG1[i][1], &fG1[i][2], &fG1[i][3], &fG1[i][4]);
142 fZ1[i] = fZ1[i-1] + z;
150 for (i = 0; i < 21; i++)
152 fscanf(file, "%f %f %f %f %f %f", &z,
153 &fG2[i][0], &fG2[i][1], &fG2[i][2], &fG2[i][3], &fG2[i][4]);
155 fZ2[i] = fZ2[i-1] + z;
161 // Transform into interaction rates
163 const Float_t crossSection = 0.094e-28; // m^2
164 Float_t pFlux[5] = {0.2, 0.2, 0.3, 0.3, 1.0};
166 for (j = 0; j < 5; j++) {
167 pFlux[j] *= 1.e11/25.e-9;
168 for (i = 0; i < 21; i++)
170 fG1[i][j] = fG1[i][j] * crossSection * pFlux[j]; // 1/m/s
171 fG2[i][j] = fG2[i][j] * crossSection * pFlux[j]; // 1/m/s
179 for (Int_t i = 0; i < 300; i++) {
180 Float_t z = 20.+i*1.;
182 Float_t wgt1 = GassPressureWeight(z);
183 Float_t wgt2 = GassPressureWeight(-z);
184 // printf("weight: %f %f %f %f %f \n", z, wgt1, wgt2, fZ1[20], fZ2[20]);
190 printf("\n %f %f \n \n", sum1, sum2);
193 //____________________________________________________________
194 void AliGenHaloProtvino::Generate()
196 // Generate from input file
198 Float_t polar[3]= {0,0,0};
208 Float_t* zPrimary = new Float_t [fNpart];
209 Int_t * inuc = new Int_t [fNpart];
210 Int_t * ipart = new Int_t [fNpart];
211 Float_t* wgt = new Float_t [fNpart];
212 Float_t* ekin = new Float_t [fNpart];
213 Float_t* vx = new Float_t [fNpart];
214 Float_t* vy = new Float_t [fNpart];
215 Float_t* tx = new Float_t [fNpart];
216 Float_t* ty = new Float_t [fNpart];
218 Float_t zVertexOld = -1.e10;
219 Int_t nInt = 0; // Counts number of interactions
223 // Load event into array
225 ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f",
226 &zPrimary[nread], &inuc[nread], &ipart[nread], &wgt[nread],
227 &ekin[nread], &vx[nread], &vy[nread],
228 &tx[nread], &ty[nread]);
230 if (ncols < 0) break;
231 // Skip fNskip events
233 if (fNpart !=-1 && nskip <= fNskip) continue;
234 // Count interactions
235 if (zPrimary[nread] != zVertexOld) {
237 zVertexOld = zPrimary[nread];
241 if (fNpart !=-1 && nread > fNpart) break;
244 // Mean time between interactions
246 Float_t dT = fTimePerEvent/nInt; // sec
247 Float_t t = 0; // sec
250 // Loop over primaries
255 for (Int_t nprim = 0; nprim < fNpart; nprim++)
257 amass = TDatabasePDG::Instance()->GetParticle(ipart[nprim])->Mass();
262 p0=sqrt(ekin[nprim]*ekin[nprim] + 2.*amass*ekin[nprim]);
264 txy=TMath::Sqrt(tx[nprim]*tx[nprim]+ty[nprim]*ty[nprim]);
268 tz=-TMath::Sqrt(1.-txy);
275 origin[0] = vx[nprim];
276 origin[1] = vy[nprim];
283 Float_t originP[3] = {0., 0., 0.};
284 originP[2] = zPrimary[nprim];
286 Float_t pP[3] = {0., 0., 0.};
290 originP[2] = -zPrimary[nprim];
291 origin[2] = -origin[2];
298 if (zPrimary[nprim] != zVertexOld) {
299 while(arg==0.) arg = gRandom->Rndm();
300 t -= dT*TMath::Log(arg); // (sec)
301 zVertexOld = zPrimary[nprim];
304 // Get statistical weight according to local gas-pressure
306 fParentWeight=wgt[nprim]*GassPressureWeight(zPrimary[nprim]);
308 if (!fAnalog || gRandom->Rndm() < fParentWeight) {
309 // Pass parent particle
311 SetTrack(0,-1,kProton,pP,originP,polar,t,kPNoProcess,ntP, fParentWeight);
313 SetTrack(fTrackIt,ntP,ipart[nprim],p,origin,polar,t,kPNoProcess,nt,fParentWeight);
317 // Both sides are considered
321 fParentWeight=wgt[nprim]*GassPressureWeight(-zPrimary[nprim]);
322 if (!fAnalog || gRandom->Rndm() < fParentWeight) {
323 origin[2] = -origin[2];
324 originP[2] = -originP[2];
326 SetTrack(0,-1,kProton,pP,originP,polar,t,kPNoProcess,ntP, fParentWeight);
328 SetTrack(fTrackIt,ntP,ipart[nprim],p,origin,polar,t,kPNoProcess,nt,fParentWeight);
331 SetHighWaterMark(nt);
345 AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs)
347 // Assignment operator
353 Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary)
356 // Return z-dependent gasspressure weight = interaction rate [1/m/s].
360 Float_t zAbs = TMath::Abs(zPrimary);
363 if (zAbs > fZ1[20]) {
366 for (Int_t i = 1; i < 21; i++) {
368 weight = fG1[i][fRunPeriod];
374 if (zAbs > fZ2[20]) {
377 for (Int_t i = 1; i < 21; i++) {
379 weight = fG2[i][fRunPeriod];
389 # Title: README file for the sources of IR8 machine induced background
390 # Author: Vadim Talanov <Vadim.Talanov@cern.ch>
391 # Modified: 12-12-2000
395 There are three files, named ring.one.beta.[01,10,50].m, which
396 contain the lists of background particles, induced by proton losses
397 upstream of IP8 in the LHC ring one, for the beta* values of 1, 10
398 and 50 m, respectively.
402 Each line in the files contains the coordinates of particle track
403 crossing with the infinite plane, positioned at z=-1m, together with
404 the physical properties of corresponding particle, namely:
406 S - S coordinate of the primary interaction vertex, cm;
407 N - type of the gas nuclei at interaction, 1 is H, 2 - C and 3 - O;
408 I - particle ID in PDG particle numbering scheme;
410 E - particle kinetic energy, GeV;
411 X - x coordinate of the crossing point, cm;
412 Y - y coordinate of the crossing point, cm;
413 Dx - x direction cosine;
414 Dy - y direction cosine.
418 Each file is given per unity of linear density of proton inelastic
419 interactions with the gas nuclei, [1 inelastic interaction/m].
421 # ~/vtalanov/public/README.mib: the end.