introducing SDD, SSD layer misal (Andrea Dainese)
[u/mrichter/AliRoot.git] / EVGEN / AliGenHalo.cxx
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4c039060 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
803d1ab0 16/* $Id$ */
4c039060 17
675e9664 18// Read background particles from a boundary source
19// Very specialized generator to simulate background from beam halo.
20// The input file is a text file specially prepared
21// for this purpose.
22// Author: andreas.morsch@cern.ch
23
116cbefd 24#include <stdlib.h>
c5970876 25
1578254f 26#include <TDatabasePDG.h>
116cbefd 27#include <TPDGCode.h>
28
29#include "AliGenHalo.h"
30#include "AliRun.h"
f87cfe57 31
198bb1c7 32ClassImp(AliGenHalo)
33
34AliGenHalo::AliGenHalo()
1c56e311 35 :AliGenerator(-1),
36 fp(0),
37 fFileName(0)
fe4da5cc 38{
f87cfe57 39// Constructor
fe4da5cc 40 fName="Halo";
41 fTitle="Halo from LHC Tunnel";
fe4da5cc 42//
43// Read all particles
44 fNpart=-1;
fe4da5cc 45}
46
47AliGenHalo::AliGenHalo(Int_t npart)
1c56e311 48 :AliGenerator(npart),
49 fp(0),
50 fFileName(0)
fe4da5cc 51{
f87cfe57 52// Constructor
fe4da5cc 53 fName="Halo";
54 fTitle="Halo from LHC Tunnel";
fe4da5cc 55//
56// Read all particles
57 fNpart=-1;
fe4da5cc 58}
59
60//____________________________________________________________
61AliGenHalo::~AliGenHalo()
62{
f87cfe57 63// Destructor
fe4da5cc 64}
65
66//____________________________________________________________
67void AliGenHalo::Init()
f87cfe57 68{
69// Initialisation
70}
fe4da5cc 71
72//____________________________________________________________
73void AliGenHalo::Generate()
74{
f87cfe57 75// Generate from input file
dc1d768c 76 fp = fopen(fFileName,"r");
fe4da5cc 77 if (fp) {
bd1cece1 78 printf("\n File %s opened for reading ! \n ", (char*) &fFileName);
fe4da5cc 79 } else {
bd1cece1 80 printf("\n Opening of file %s failed ! \n ", (char*) &fFileName);
fe4da5cc 81 }
82//
83// MARS particle codes
f87cfe57 84 const Int_t kmars[12]={0,kProton,kNeutron,kPiPlus,kPiMinus,kKPlus,kKMinus,
1578254f 85 kMuonPlus,kMuonMinus,kGamma,kElectron,kPositron};
fe4da5cc 86
87 Float_t polar[3]= {0,0,0};
88 Float_t origin[3];
89 Float_t p[3], p0;
90 Float_t ekin, wgt, tx, ty, tz, txy;
1578254f 91 Float_t amass;
fe4da5cc 92 //
1578254f 93 Int_t ipart, ncols, nt;
fe4da5cc 94
95 Int_t nread=0;
96 origin[2]=2650;
97
98 while(1) {
99 ncols = fscanf(fp,"%i %f %f %f %f %f %f",
100 &ipart, &ekin, &wgt,
101 &origin[0], &origin[1],
102 &tx, &ty);
103 if (ncols < 0) break;
104 nread++;
105 if (fNpart !=-1 && nread > fNpart) break;
f87cfe57 106 ipart = kmars[ipart];
1578254f 107 amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
fe4da5cc 108 p0=sqrt(ekin*ekin + 2.*amass);
109
110 txy=TMath::Sqrt(tx*tx+ty*ty);
111 if (txy == 1.) {
112 tz=0;
113 } else {
114 tz=-TMath::Sqrt(1.-txy);
115 }
116 p[0]=p0*tx;
117 p[1]=p0*ty;
118 p[2]=p0*tz;
119 fParentWeight=wgt;
642f15cf 120 PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
121// PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,"Halo+",nt,fParentWeight);
fe4da5cc 122 origin[2]=-origin[2];
123 p[2]=-p[2];
642f15cf 124 PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
125// PushTrack(fTrackIt,-1,ipart,p,origin,polar,0,"Halo-",nt,fParentWeight);
fe4da5cc 126 origin[2]=-origin[2];
127 p[2]=-p[2];
128 }
129}
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