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 2001/07/27 17:09:35 morsch
19 Use local SetTrack, KeepTrack and SetHighWaterMark methods
20 to delegate either to local stack or to stack owned by AliRun.
21 (Piotr Skowronski, A.M.)
23 Revision 1.6 2000/12/21 16:24:06 morsch
24 Coding convention clean-up
26 Revision 1.5 2000/12/06 15:11:38 morsch
27 Correct double declared data members.
29 Revision 1.4 2000/11/30 07:12:50 alibrary
30 Introducing new Rndm and QA classes
32 Revision 1.3 2000/10/02 21:28:06 fca
33 Removal of useless dependecies via forward declarations
35 Revision 1.2 2000/06/09 20:37:51 morsch
36 All coding rule violations except RS3 corrected
38 Revision 1.1 2000/02/23 16:25:14 morsch
39 First commit of this file
43 // As AliGenScan, generation of particles on a 3-dim grid
44 // but here double hits with a predefined distance are generated.
45 // The second particle is generated at a constant distance but with random phi.
46 // Generator can be used to evaluate double hit resolutions.
47 // Author: andreas.morsch@cern.ch
49 #include "AliGenDoubleScan.h"
52 ClassImp(AliGenDoubleScan)
54 AliGenDoubleScan::AliGenDoubleScan()
59 AliGenDoubleScan::AliGenDoubleScan(Int_t npart)
63 fName = "Double Scan";
64 fTitle= "Particle Generator for two correlated particles on a grid";
67 //____________________________________________________________
68 AliGenDoubleScan::~AliGenDoubleScan()
73 //____________________________________________________________
74 void AliGenDoubleScan::Generate()
77 // Generate one trigger
80 Float_t polar[3]= {0,0,0};
85 Float_t pmom, theta, phi;
92 dx=(fXCmax-fXCmin)/fNx;
98 dy=(fYCmax-fYCmin)/fNy;
104 dz=(fZmax-fZmin)/fNz;
108 for (Int_t ix=0; ix<fNx; ix++) {
109 for (Int_t iy=0; iy<fNy; iy++) {
110 for (Int_t iz=0; iz<fNz; iz++){
112 origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
113 origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
114 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
115 pmom=fPMin+random[3]*(fPMax-fPMin);
116 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
117 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
118 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
119 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
120 p[2] = pmom*TMath::Cos(theta);
121 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
123 // Generate 2nd particle at distance fDistance from the first
126 Float_t phi2=2.*TMath::Pi()*random[0];
127 Float_t dx =fDistance*TMath::Sin(phi2);
128 Float_t dy =fDistance*TMath::Cos(phi2);
129 origin[0]=origin[0]+dx;
130 origin[1]=origin[1]+dy;
131 pmom=fPMin+random[1]*(fPMax-fPMin);
132 theta=fThetaMin+random[2]*(fThetaMax-fThetaMin);
133 phi=fPhiMin+random[3]*(fPhiMax-fPhiMin);
134 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
135 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
136 p[2] = pmom*TMath::Cos(theta);
137 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);