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 1.8.6.1 2002/07/30 15:00:39 alibrary
19 Correction in initialization of dx (Enrique Gamez Flores).
21 Revision 1.9 2002/07/30 13:48:03 morsch
23 Correction in initialization of dx (Enrique Gamez Flores).
25 Revision 1.8 2002/02/08 16:50:50 morsch
26 Add name and title in constructor.
28 Revision 1.7 2001/07/27 17:09:35 morsch
29 Use local SetTrack, KeepTrack and SetHighWaterMark methods
30 to delegate either to local stack or to stack owned by AliRun.
31 (Piotr Skowronski, A.M.)
33 Revision 1.6 2000/12/21 16:24:06 morsch
34 Coding convention clean-up
36 Revision 1.5 2000/12/06 15:11:38 morsch
37 Correct double declared data members.
39 Revision 1.4 2000/11/30 07:12:50 alibrary
40 Introducing new Rndm and QA classes
42 Revision 1.3 2000/10/02 21:28:06 fca
43 Removal of useless dependecies via forward declarations
45 Revision 1.2 2000/06/09 20:37:51 morsch
46 All coding rule violations except RS3 corrected
48 Revision 1.1 2000/02/23 16:25:14 morsch
49 First commit of this file
53 // As AliGenScan, generation of particles on a 3-dim grid
54 // but here double hits with a predefined distance are generated.
55 // The second particle is generated at a constant distance but with random phi.
56 // Generator can be used to evaluate double hit resolutions.
57 // Author: andreas.morsch@cern.ch
59 #include "AliGenDoubleScan.h"
62 ClassImp(AliGenDoubleScan)
64 AliGenDoubleScan::AliGenDoubleScan()
69 AliGenDoubleScan::AliGenDoubleScan(Int_t npart)
73 fName = "Double Scan";
74 fTitle= "Particle Generator for two correlated particles on a grid";
77 //____________________________________________________________
78 AliGenDoubleScan::~AliGenDoubleScan()
83 //____________________________________________________________
84 void AliGenDoubleScan::Generate()
87 // Generate one trigger
90 Float_t polar[3]= {0,0,0};
95 Float_t pmom, theta, phi;
102 dx=(fXCmax-fXCmin)/fNx;
108 dy=(fYCmax-fYCmin)/fNy;
114 dz=(fZmax-fZmin)/fNz;
118 for (Int_t ix=0; ix<fNx; ix++) {
119 for (Int_t iy=0; iy<fNy; iy++) {
120 for (Int_t iz=0; iz<fNz; iz++){
122 origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
123 origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
124 origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
125 pmom=fPMin+random[3]*(fPMax-fPMin);
126 theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
127 phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
128 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
129 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
130 p[2] = pmom*TMath::Cos(theta);
131 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
133 // Generate 2nd particle at distance fDistance from the first
136 Float_t phi2=2.*TMath::Pi()*random[0];
137 Float_t dx =fDistance*TMath::Sin(phi2);
138 Float_t dy =fDistance*TMath::Cos(phi2);
139 origin[0]=origin[0]+dx;
140 origin[1]=origin[1]+dy;
141 pmom=fPMin+random[1]*(fPMax-fPMin);
142 theta=fThetaMin+random[2]*(fThetaMax-fThetaMin);
143 phi=fPhiMin+random[3]*(fPhiMax-fPhiMin);
144 p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
145 p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
146 p[2] = pmom*TMath::Cos(theta);
147 SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);